update: removed const modifier on token value

following steps on the parsing process can change its content

AGENTS.md

@@ -0,0 +1,35 @@
+# Repository Guidelines
+
+## Project Structure & Module Organization
+- `src/` holds the shell implementation, with submodules for `builtins/`, `executor/`, `parser/`, and `variables/`.
+- `include/` contains public headers used across modules.
+- `lib/` is populated at build time with third-party 42 libraries (libft, get_next_line, ft_printf, ft_args).
+- `docs/` stores project references and manual test notes (see `docs/tests.md`).
+- `build/` is the object output directory generated by `make`.
+
+## Build, Test, and Development Commands
+- `make` or `make all`: build `minishell` (auto-clones required libs into `lib/`).
+- `make clean`: remove objects in `build/`.
+- `make fclean`: remove objects and the `minishell` binary (also cleans libs).
+- `make re`: full rebuild.
+- `./minishell`: run locally after a build.
+- `make DEBUG=lldb` or `make DEBUG=valgrind` or `make DEBUG=address`: rebuild with debug/ASan-friendly flags.
+
+## Coding Style & Naming Conventions
+- The codebase follows 42 **Norminette v4** rules. Run `norminette *.c *.h` (or on specific files) before submitting changes.
+- Keep file names lowercase with underscores (e.g., `src/builtins/echo/echo.c`).
+- Keep headers in `include/` and expose only what modules need.
+
+## Testing Guidelines
+- There is no automated test runner. Use manual checks in `docs/tests.md` and basic shell behavior checks (pipes, redirects, builtins).
+- When debugging memory issues, run under valgrind and use the suppression file in `valgrind/readline.supp`.
+
+## Commit & Pull Request Guidelines
+- Commit messages in this repo use a simple `type: summary` format (examples: `update: ...`, `fix: ...`). Keep summaries short and specific.
+- For PRs, include:
+  1. What changed and why.
+  2. How to test (commands or manual steps).
+  3. Notes on any parser/executor/builtin behavior changes.
+
+## Configuration Tips
+- The project depends on `readline`; ensure your system has `libreadline-dev` or equivalent before building.

Makefile

@@ -6,7 +6,7 @@
 #    By: sede-san <sede-san@student.42madrid.com    +#+  +:+       +#+         #
 #                                                 +#+#+#+#+#+   +#+            #
 #    Created: 2025/07/30 20:22:21 by sede-san          #+#    #+#              #
-#    Updated: 2025/11/01 19:30:37 by sede-san         ###   ########.fr        #
+#    Updated: 2026/02/05 21:06:52 by sede-san         ###   ########.fr        #
 #                                                                              #
 # **************************************************************************** #
 
@@ -21,11 +21,11 @@ CFLAGS	= -Wall -Wextra -Werror
 HEADERS	= -I $(INCLUDE_PATH) $(LIBS_INCLUDE)
 
 ifeq ($(DEBUG), lldb) # debug with LLDB
-	CFLAGS	+= -g3
+	CFLAGS	= -g3
 else ifeq ($(DEBUG), valgrind) # debug with valgrind
-	CFLAGS	+= -g3
+	CFLAGS = -g3
 else ifeq ($(DEBUG), address) # use AdressSanitize
-	CFLAGS	+= -fsanitize=address -g3
+	CFLAGS	= -fsanitize=address -g3
 else # apply optimization flags if no debugging is being done
 	CFLAGS	+= -O3
 endif
@@ -55,7 +55,7 @@ $(OBJS_PATH)/%.o: $(SRC_PATH)/%.c
 all: mandatory
 .PHONY: all
 
-mandatory: libft get_next_line ft_printf $(NAME)
+mandatory: libft get_next_line ft_printf ft_args $(NAME)
 .PHONY: mandatory
 
 $(NAME): $(OBJS)

docs/defensa_resumen_es.md

@@ -0,0 +1,77 @@
+# Minishell - Resumen para defensa
+
+Este documento es un guion breve para explicar el proyecto con claridad.
+
+## 1. Que es minishell
+- Un shell interactivo basico: lee comandos, los parsea y los ejecuta.
+- Objetivo didactico: procesos, pipes, fds, señales y parsing.
+
+## 2. Flujo general (en 20 segundos)
+1. Prompt con readline.
+2. Lexer divide la linea en tokens validos (respetando comillas).
+3. Parser crea comandos, argv y redirecciones.
+4. Expansion de variables ($VAR, $?).
+5. Resolver PATH.
+6. Ejecutar con fork/execve y pipes.
+7. Actualizar exit status.
+
+## 3. Puntos clave que suelen preguntar
+
+### Comillas
+- Comilla simple: todo literal, no expansion.
+- Comilla doble: expansion de $VAR, pero no metacaracteres.
+- Si una comilla no se cierra: error y no se ejecuta nada.
+
+### Redirecciones
+- <, >, >>, <<.
+- Se resuelven antes de ejecutar el comando.
+- Heredoc: lectura hasta delimitador, sin historial.
+
+### Pipes
+- Conecto stdout del comando i con stdin del comando i+1.
+- Uso pipe() y dup2() en el child.
+- El padre cierra fds que no usa.
+
+### Builtins
+- echo -n, cd, pwd, export, unset, env, exit.
+- Si no hay pipeline, se ejecutan en el padre para afectar el estado.
+- En pipeline, se ejecutan en el child.
+
+### Variables
+- $VAR: entorno.
+- $?: ultimo exit status.
+
+### Senales
+- Una sola variable global para la senal.
+- ctrl-C: nueva linea y prompt.
+- ctrl-D: salir del shell.
+- ctrl-\: no hace nada.
+
+## 4. Ejemplos rapidos para demostrar
+
+1. Pipes
+- `ls | wc -l`
+
+2. Redirecciones
+- `echo hola > out.txt`
+- `cat < out.txt`
+
+3. Heredoc
+- `cat << EOF`
+- escribir lineas
+- `EOF`
+
+4. Expansion
+- `echo $HOME`
+- `echo $?`
+
+## 5. Errores y robustez
+- No ejecuto si hay errores de parseo.
+- Mensajes con perror cuando fallan syscalls.
+- exit_status siempre actualizado.
+
+## 6. Mensajes finales recomendados
+- "He separado parsing y ejecucion para que el codigo sea mantenible y
+  la defensa mas clara".
+- "Sigo el comportamiento de bash como referencia".
+

docs/guia_obligatoria_es.md

@@ -0,0 +1,292 @@
+# Minishell - Guia de estructura y pasos (parte obligatoria)
+
+Objetivo de este documento
+- Proponer una estructura de archivos y datos.
+- Describir el proceso paso a paso como tutorial.
+- Servir de guion para defensa (explicaciones claras y ordenadas).
+
+Este documento no implementa nada. Solo define el plan y el por que.
+
+---
+
+## 1. Vision general del flujo
+
+El shell se puede explicar como una tuberia de fases:
+1. Lectura interactiva (prompt + historial).
+2. Tokenizacion (lexing) con comillas y metacaracteres.
+3. Parseo (construccion de comandos, redirecciones, pipes).
+4. Expansion de variables ($VAR y $?).
+5. Preparacion de ejecucion (resolucion de rutas, heredoc).
+6. Ejecucion (builtins o execve) con pipes y redirecciones.
+7. Gestion de exit status y señales.
+
+Esta separacion permite explicar en defensa cada pieza por separado y justificar
+las decisiones tecnicas.
+
+---
+
+## 2. Propuesta de estructuras de datos
+
+Estas estructuras son solo guia. Adapta nombres a tu estilo y Norminette.
+
+### 2.1 Token (lexer)
+Representa una unidad del input (palabra, pipe, redireccion, etc.).
+
+- enum e_tokentype
+  - TOK_WORD
+  - TOK_PIPE
+  - TOK_REDIR_IN (<)
+  - TOK_REDIR_OUT (>)
+  - TOK_REDIR_APPEND (>>)
+  - TOK_HEREDOC (<<)
+
+- struct s_token
+  - char *text
+  - t_tokentype type
+  - struct s_token *next
+
+Uso en defensa: el lexer separa el input en unidades, respetando comillas.
+
+### 2.2 Redireccion
+Guarda los datos de redireccion por comando.
+
+- enum e_redirtype
+  - REDIR_IN
+  - REDIR_OUT
+  - REDIR_APPEND
+  - REDIR_HEREDOC
+
+- struct s_redir
+  - t_redirtype type
+  - char *target
+  - int fd
+  - struct s_redir *next
+
+Notas:
+- target es el filename o delimitador de heredoc.
+- fd se resuelve en fase de preparacion (open o pipe temporal).
+
+### 2.3 Comando
+
+- struct s_command
+  - char **argv
+  - int argc
+  - char *path
+  - t_redir *redirs
+
+### 2.4 Pipeline
+Una lista de comandos en orden, unidos por pipes.
+
+- struct s_pipeline
+  - t_command **cmds
+  - size_t count
+
+
+---
+
+## 3. Lexer: reglas y pasos
+
+Reglas clave del subject:
+- No interpretar comillas sin cerrar.
+- Comilla simple: no se expanden variables ni metacaracteres.
+- Comilla doble: se expanden variables, pero se respetan caracteres normales.
+- Metacaracteres: |, <, >, <<, >> separan tokens.
+
+Pasos recomendados:
+1. Recorrer la linea caracter a caracter.
+2. Mantener estado: in_single, in_double.
+3. Cuando no estas en comillas, detectar metacaracteres y cortar tokens.
+4. Construir TOK_WORD con el texto exacto (sin eliminar comillas aun).
+5. Si llegas a fin de linea con in_single o in_double activo, error de parseo.
+
+Explicacion para defensa:
+- El lexer no sabe de ejecucion, solo separa en tokens validos.
+- El manejo de comillas se hace aqui para respetar la sintaxis del shell.
+
+---
+
+## 4. Parser: construccion de comandos
+
+Objetivo: transformar tokens en una estructura ejecutable.
+
+Pasos:
+1. Recorrer lista de tokens.
+2. Cada TOK_PIPE cierra un comando actual y abre el siguiente.
+3. TOK_WORD se agrega a argv.
+4. TOK_REDIR_* consume el siguiente token (debe ser TOK_WORD) como target.
+5. Construir lista de redirecciones para cada comando.
+6. Validar errores: pipe inicial/final, redireccion sin target, etc.
+
+Explicacion para defensa:
+- El parser aplica reglas de orden y construye una estructura clara.
+- Separar argv y redirecciones evita mezclar logica en executor.
+
+---
+
+## 5. Expansion de variables
+
+Reglas:
+- $VAR se sustituye por getenv/tabla interna.
+- $? se sustituye por el exit_status anterior.
+- En comilla simple no se expande.
+- En comilla doble si se expande.
+
+Proceso recomendado:
+1. Durante tokenizacion, guardar el texto con sus comillas o bien
+   marcar segmentos con estado de comillas.
+2. En expansion, recorrer cada palabra y reemplazar $...
+3. Si variable no existe, reemplazar por string vacio.
+4. Eliminar comillas despues de la expansion.
+
+Explicacion para defensa:
+- La expansion es una fase separada para no complicar el parser.
+- $?, variable especial, refleja el estado de la ultima ejecucion.
+
+---
+
+## 6. Redirecciones y heredoc
+
+Redirecciones basicas:
+- <: open(file, O_RDONLY)
+- >: open(file, O_WRONLY | O_CREAT | O_TRUNC)
+- >>: open(file, O_WRONLY | O_CREAT | O_APPEND)
+
+Heredoc (<<):
+1. Leer lineas hasta delimitador exacto.
+2. Guardar el contenido en un pipe o fichero temporal.
+3. Usar el extremo de lectura como STDIN del comando.
+4. No guardar el contenido en historial.
+
+Explicacion para defensa:
+- Las redirecciones se resuelven antes de ejecutar el proceso.
+- Heredoc es una fuente especial de entrada.
+
+---
+
+## 7. Resolucion de comandos y PATH
+
+Reglas:
+- Si argv[0] es una ruta absoluta o relativa (/, ./, ../), usarla tal cual.
+- Si no, buscar en PATH separando por ':'.
+- Si es builtin, no se necesita path real.
+
+Proceso:
+1. Detectar builtin.
+2. Si no builtin y no es ruta, recorrer PATH y usar access().
+3. Guardar path en t_command->path.
+
+---
+
+## 8. Ejecucion
+
+Caso 1: comando unico builtin
+- Ejecutar en el proceso padre para que pueda modificar estado del shell
+  (ej: cd, export, unset, exit).
+
+Caso 2: pipeline o comando externo
+- Usar fork + execve.
+- Crear pipes entre comandos.
+- Aplicar redirecciones antes de ejecutar.
+
+Proceso para pipeline:
+1. Para cada comando, crear pipe si hay siguiente.
+2. fork.
+3. En child: dup2 para redirecciones y pipes, luego ejecutar.
+4. En parent: cerrar FDs innecesarios y seguir.
+5. Esperar procesos, guardar exit status del ultimo comando.
+
+Explicacion para defensa:
+- Las pipes conectan stdout del comando i con stdin del comando i+1.
+- Los builtins dentro de pipeline se ejecutan en child.
+
+---
+
+## 9. Builtins obligatorios
+
+- echo con -n
+- cd (ruta relativa o absoluta)
+- pwd
+- export (sin opciones)
+- unset (sin opciones)
+- env (sin opciones o argumentos)
+- exit
+
+Notas de defensa:
+- export/unset trabajan sobre la tabla de variables del shell.
+- env imprime variables de entorno.
+- exit debe actualizar exit_status y terminar el loop principal.
+
+---
+
+## 10. Senales
+
+Requisitos interactivos:
+- ctrl-C: imprime nueva linea y muestra prompt.
+- ctrl-D: termina el shell.
+- ctrl-\: no hace nada.
+
+Regla del subject:
+- Solo una variable global para indicar la senal recibida.
+
+Proceso:
+1. Definir una variable global int g_signal.
+2. Configurar handlers con sigaction.
+3. En handler: actualizar g_signal y escribir un '\n' si procede.
+4. En el loop principal: si g_signal indica SIGINT, resetear lineas de readline.
+
+---
+
+## 11. Manejo de errores y salida
+
+- Mostrar errores con perror o mensajes consistentes.
+- Si parseo falla, no ejecutar nada.
+- Mantener exit_status actualizado.
+
+Explicacion en defensa:
+- Un shell robusto evita ejecutar comandos parcialmente parseados.
+- exit_status es clave para $?.
+
+---
+
+## 12. Checklist para defensa (guion rapido)
+
+1. Explico el flujo completo: lectura -> lexer -> parser -> expansion -> exec.
+2. Explico como manejo comillas y metacaracteres.
+3. Explico como construyo argv y redirecciones.
+4. Explico expansion de $VAR y $?.
+5. Explico pipes y redirecciones con dup2.
+6. Explico por que los builtins se ejecutan en parent o child.
+7. Explico manejo de senales y la variable global unica.
+8. Explico exit_status y comportamiento de $?.
+
+---
+
+## 13. Sugerencia de estructura de archivos
+
+- include/
+  - minishell.h
+  - core.h (estructuras globales y estado)
+  - parser.h (tokens, parser)
+  - executor.h
+  - builtins.h
+
+- src/
+  - core/ (init, signals, util)
+  - parser/ (lexer.c, parser.c, expand.c)
+  - executor/ (executor.c, redirs.c)
+  - builtins/ (echo, cd, pwd, exit, env, export, unset)
+  - variables/ (environment.c)
+  - minishell.c (loop principal)
+  - main.c
+
+Esto es solo una guia; no es obligatorio seguirla al pie de la letra.
+
+---
+
+## 14. Consejos para la defensa
+
+- Usa bash como referencia de comportamiento.
+- Demuestra un par de ejemplos: pipe, redireccion y expansion.
+- Si algo falla, explica que el parser previene ejecucion parcial.
+- Recalca el manejo correcto de ctrl-C y ctrl-\.
+

executor_new_previous.c

@@ -0,0 +1,341 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   executor_new.c                                     :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: sede-san <sede-san@student.42madrid.com    +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2025/10/28 13:03:44 by sede-san          #+#    #+#             */
+/*   Updated: 2026/02/08 19:05:37 by sede-san         ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "executor.h"
+#include "builtins.h"
+#include <stdint.h>
+#include <errno.h>
+
+static void handle_execve_error();
+static void handle_parent_process(
+	int *prev_read_fd,
+	t_list *current_command,
+	int pipefd[2]
+);
+static int handle_pipeline(
+	t_list *current_command,
+	int pipefd[2],
+	int *exit_status
+);
+static inline uint8_t	execute_builtin(
+	t_command *command,
+	t_minishell *minishell
+);
+static void	execute_external_command(
+	t_command *command,
+	t_minishell *minishell
+);
+static pid_t handle_fork(
+	t_list *current_command,
+	t_minishell *minishell
+);
+static uint8_t execute_command(
+	t_command *command,
+	t_minishell *minishell
+);
+
+static inline bool		can_execute_command(t_command *command, t_minishell *minishell);
+static inline bool		command_exists(t_command *command, t_minishell *minishell);
+static void			cmdfree(t_command *command);
+static void			cmdfree_argv(char **argv);
+
+# define WRITE_PIPE 1
+# define READ_PIPE 0
+# define CHILD_PID 0
+
+u_int8_t	execute(
+	t_list *command_list,
+	t_minishell *minishell
+) {
+	t_list	*current_command;
+	int		prev_read_fd;
+	int		exit_status;
+	int		pipefd[2];
+	pid_t	pid;
+
+
+	prev_read_fd = -1;
+	exit_status = EXIT_SUCCESS;
+	current_command = command_list;
+	while (current_command != NULL)
+	{
+		if (handle_pipeline(current_command, pipefd, &exit_status) == EXIT_FAILURE)
+			break ;
+		pid = handle_fork(current_command, minishell);
+		if (pid == -1)
+		{
+			perror("fork");
+			exit_status = EXIT_FAILURE;
+			break ;
+		}
+		if (pid == CHILD_PID)
+			handle_child_process(prev_read_fd, current_command, pipefd, minishell);
+		handle_parent_process(&prev_read_fd, current_command, pipefd);
+		current_command = current_command->next;
+	}
+	ft_lstclear(&command_list, (void (*)(void *))cmdfree);
+	while (wait(&exit_status) > 0)
+	{
+		if (WIFEXITED(exit_status))
+			exit_status = WEXITSTATUS(exit_status);
+	}
+	return (exit_status);
+}
+
+static int handle_pipeline(
+	t_list *current_command,
+	int pipefd[2],
+	int *exit_status
+) {
+	if (current_command->next) // create pipe if needed
+	{
+		if (pipe(pipefd) == -1)
+		{
+			perror("pipe");
+			*exit_status = EXIT_FAILURE;
+			return (EXIT_FAILURE);
+		}
+	}
+	return (EXIT_SUCCESS);
+}
+
+static void handle_parent_process(
+	int *prev_read_fd,
+	t_list *current_command,
+	int pipefd[2]
+) {
+	if (*prev_read_fd != -1)
+		close(*prev_read_fd);
+	if (current_command->next)
+	{
+		close(pipefd[WRITE_PIPE]); // parent does not write
+		*prev_read_fd = pipefd[READ_PIPE]; // pass read end forward
+	}
+	else
+		*prev_read_fd = -1;
+}
+
+static pid_t handle_fork(
+	t_list *current_command,
+	t_minishell *minishell
+) {
+	pid_t	pid;
+	const t_command *command = (t_command *)current_command->content;
+
+	pid = 0;
+	if (current_command->next != NULL
+		|| !is_builtin(command->path, minishell))
+		pid = fork();
+	return (pid);
+}
+
+void handle_child_process(int prev_read_fd, t_list *current_command, int pipefd[2], t_minishell *minishell)
+{
+	redirect_pipes(prev_read_fd, current_command, pipefd);
+	execute_command((t_command *)current_command->content, minishell);
+}
+
+void redirect_pipes(int prev_read_fd, t_list *current_command, int pipefd[2])
+{
+	redirect_input_pipe(prev_read_fd);
+	redirect_output_pipe(current_command, pipefd);
+}
+
+void redirect_output_pipe(t_list * current_command, int  pipefd[2])
+{
+	if (current_command->next)
+	{
+		dup2(pipefd[WRITE_PIPE], STDOUT_FILENO);
+		close(pipefd[READ_PIPE]);
+		close(pipefd[WRITE_PIPE]);
+	}
+}
+
+void redirect_input_pipe(int prev_read_fd)
+{
+	if (prev_read_fd != -1)
+	{
+		dup2(prev_read_fd, STDIN_FILENO);
+		close(prev_read_fd);
+	}
+}
+
+static inline bool	can_execute_command(
+	t_command *command,
+	t_minishell *minishell
+) {
+	if (!is_builtin(command->path, minishell)
+		&& access(command->path, X_OK) != EXIT_SUCCESS)
+		return (false);
+	return (true);
+}
+
+static inline bool	command_exists(
+	t_command *command,
+	t_minishell *minishell
+) {
+	if (!is_builtin(command->path, minishell)
+		&& access(command->path, F_OK) != EXIT_SUCCESS)
+		return (false);
+	return (true);
+}
+
+static uint8_t execute_command(
+	t_command *command,
+	t_minishell *minishell
+) {
+	if (is_builtin(command->path, minishell))
+		return (execute_builtin(command, minishell));
+	else
+	{
+		execute_external_command(command, minishell);
+		return (EXIT_FAILURE); //! should never reach here
+	}
+}
+
+static inline uint8_t	execute_builtin(
+	t_command *command,
+	t_minishell *minishell
+) {
+	const t_builtin_func	builtin 
+		= ft_hashmap_get(minishell->builtins, command->path);
+
+	return (builtin(*command, minishell));
+}
+
+static void	execute_external_command(
+	t_command *command,
+	t_minishell *minishell
+) {
+	char	**envp;
+
+	envp = get_envp(minishell);
+	if (envp == NULL)
+	{
+		perror("get_envp");
+		exit(EXIT_FAILURE);
+	}
+	execve(command->path, command->argv, envp);
+	handle_execve_error();
+}
+
+static void handle_execve_error() {
+	perror("execve");
+	exit(EXIT_FAILURE);
+}
+
+// static inline bool	is_piped(
+// 	t_command *command
+// ) {
+// 	return (command->piped_to != NULL || command->piped_from != NULL);
+// }
+
+// static u_int8_t handle_child_process(
+// 	t_command *command,
+// 	t_minishell *minishell
+// ) {
+// 	if (!redirect_pipes(command))
+// 		exit(EXIT_FAILURE);
+// 	execute_command(command, minishell);
+// 	exit(EXIT_FAILURE);
+// }
+
+// static int redirect_pipe(
+// 	int from,
+// 	int to
+// ) {
+// 	if (dup2(from, to) == -1)
+// 		return (-1);
+// 	close(from);
+// 	return (0);
+// }
+
+// static int redirect_pipes(
+// 	t_command *command
+// ) {
+// 	if (command->piped_from &&
+// 		redirect_pipe(command->piped_from->outfile, STDIN_FILENO) == -1)
+// 	{
+// 		perror("dup2");
+// 		return (0);
+// 	}
+// 	if (command->piped_to &&
+// 		redirect_pipe(command->outfile, STDOUT_FILENO) == -1)
+// 	{
+// 		perror("dup2");
+// 		return (0);
+// 	}
+// 	return (1);
+// }
+
+// static void	show_error(
+// 	t_command *command,
+// 	t_minishell *minishell
+// ) {
+// 	if (!command_exists(command, minishell))
+// 	{
+// 		ft_eprintf("minishell: %s: command not found\n", command->argv[0]);
+// 		minishell->exit_status = 127;
+// 	}
+// 	else if (!can_execute_command(command, minishell))
+// 	{
+// 		ft_eprintf("minishell: %s: %s\n", command->path, strerror(errno));
+// 		minishell->exit_status = errno;
+// 	}
+// }
+
+static void	cmdfree(
+	t_command *command
+) {
+	if (command == NULL)
+		return ;
+	cmdfree_argv(command->argv);
+	free(command->path);
+	free(command);
+}
+
+static void	cmdfree_argv(
+	char **argv
+) {
+	size_t	i;
+
+	if (argv == NULL)
+		return ;
+	i = 0;
+	while (argv[i] != NULL)
+	{
+		free(argv[i]);
+		i++;
+	}
+	free(argv);
+}
+
+// static void debug_print_command_info(
+// 	t_command *command
+// ) {
+// 	size_t	i;
+
+// 	if (command == NULL)
+// 	{
+// 		printf("Command is NULL\n");
+// 		return ;
+// 	}
+// 	printf("Command info:\n");
+// 	printf("  Path: %s\n", command->path);
+// 	printf("  Argc: %d\n", command->argc);
+// 	printf("  Argv:\n");
+// 	for (i = 0; i < (size_t)command->argc; i++)
+// 		printf("    arg[%zu]: %s\n", i, command->argv[i]);
+// 	printf("  Infile FD: %d\n", command->infile);
+// 	printf("  Outfile FD: %d\n", command->outfile);
+// 	printf("--------------------------\n");
+// }

executor_old.c

@@ -0,0 +1,256 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   executor.c                                         :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: sede-san <sede-san@student.42madrid.com    +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2025/10/28 13:03:44 by sede-san          #+#    #+#             */
+/*   Updated: 2026/02/08 03:42:11 by sede-san         ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "executor.h"
+#include "builtins.h"
+#include <errno.h>
+
+static inline bool		can_execute_command(t_command *command, t_minishell *minishell);
+static inline bool		command_exists(t_command *command, t_minishell *minishell);
+static u_int8_t		execute_command(t_command *command, t_minishell *minishell);
+static u_int8_t		execute_command(t_command *command, t_minishell *minishell);
+// static inline bool		is_piped(t_command *command);
+static void			cmdfree(t_command *command);
+static void			cmdfree_argv(char **argv);
+
+# define WRITE_PIPE 1
+# define READ_PIPE 0
+# define CHILD_PID 0
+
+u_int8_t	execute(
+	t_list *command_list,
+	t_minishell *minishell
+) {
+	t_list		*current_command;
+	int			prev_read_fd;
+	pid_t		pid;
+	u_int8_t	exit_status;
+	int			child_exit_status;
+
+	prev_read_fd = -1;
+	exit_status = EXIT_SUCCESS;
+	current_command = command_list;
+	while (current_command != NULL)
+	{
+		t_command *command = (t_command *)current_command->content;
+		int pipefd[2];
+
+		/* Create pipe ONLY if there is a next command */
+		if (current_command->next)
+		{
+			if (pipe(pipefd) == -1)
+			{
+				perror("pipe");
+                exit_status = EXIT_FAILURE;
+                break ;
+			}
+		}
+
+        // create fork
+		pid = 0;
+		if (current_command->next != NULL
+            || !is_builtin(command->path, minishell))
+		    pid = fork();
+        // handle fork error
+		if (pid == -1)
+		{
+			perror("fork");
+			return (EXIT_FAILURE);
+		}
+
+        // handle child process
+		if (pid == CHILD_PID)
+		{
+			/* If we have input from previous pipe */
+			if (prev_read_fd != -1)
+			{
+				dup2(prev_read_fd, STDIN_FILENO);
+				close(prev_read_fd);
+			}
+			/* If we pipe output to next command */
+			if (current_command->next)
+			{
+				dup2(pipefd[WRITE_PIPE], STDOUT_FILENO);
+				close(pipefd[READ_PIPE]);
+				close(pipefd[WRITE_PIPE]);
+			}
+			execute_command(command, minishell); // child process exits here
+		}
+
+        // handle parent process
+        waitpid(pid, &child_exit_status, 0); // wait for child to finish
+		if (prev_read_fd != -1)
+			close(prev_read_fd);
+
+		if (current_command->next)
+		{
+			close(pipefd[WRITE_PIPE]);          /* parent does not write */
+			prev_read_fd = pipefd[READ_PIPE];  /* pass read end forward */
+		}
+		else
+			prev_read_fd = -1;
+
+        // continue executing
+		current_command = current_command->next;
+	}
+	ft_lstclear(&command_list, (void (*)(void *))cmdfree);
+    exit_status = child_exit_status;
+	return (exit_status);
+}
+
+static inline bool	can_execute_command(
+	t_command *command,
+	t_minishell *minishell
+) {
+	if (!is_builtin(command->path, minishell)
+		&& access(command->path, X_OK) != EXIT_SUCCESS)
+		return (false);
+	return (true);
+}
+
+static inline bool	command_exists(
+	t_command *command,
+	t_minishell *minishell
+) {
+	if (!is_builtin(command->path, minishell)
+		&& access(command->path, F_OK) != EXIT_SUCCESS)
+		return (false);
+	return (true);
+}
+
+static u_int8_t execute_command(
+	t_command *command,
+	t_minishell *minishell
+)
+{
+	char			**envp;
+	t_builtin_func	builtin;
+
+	if (is_builtin(command->path, minishell))
+	{
+		builtin = ft_hashmap_get(minishell->builtins, command->path);
+		return (builtin(*command, minishell));
+	}
+	envp = get_envp(minishell);
+	execve(command->path, command->argv, envp);
+    // handle error if execve fails
+	perror("execve");
+	free_envp(envp);
+	exit(EXIT_FAILURE);
+}
+
+// static inline bool	is_piped(
+// 	t_command *command
+// ) {
+// 	return (command->piped_to != NULL || command->piped_from != NULL);
+// }
+
+// static u_int8_t handle_child_process(
+// 	t_command *command,
+// 	t_minishell *minishell
+// ) {
+// 	if (!redirect_pipes(command))
+// 		exit(EXIT_FAILURE);
+// 	execute_command(command, minishell);
+// 	exit(EXIT_FAILURE);
+// }
+
+// static int redirect_pipe(
+// 	int from,
+// 	int to
+// ) {
+// 	if (dup2(from, to) == -1)
+// 		return (-1);
+// 	close(from);
+// 	return (0);
+// }
+
+// static int redirect_pipes(
+// 	t_command *command
+// ) {
+// 	if (command->piped_from &&
+// 		redirect_pipe(command->piped_from->outfile, STDIN_FILENO) == -1)
+// 	{
+// 		perror("dup2");
+// 		return (0);
+// 	}
+// 	if (command->piped_to &&
+// 		redirect_pipe(command->outfile, STDOUT_FILENO) == -1)
+// 	{
+// 		perror("dup2");
+// 		return (0);
+// 	}
+// 	return (1);
+// }
+
+// static void	show_error(
+// 	t_command *command,
+// 	t_minishell *minishell
+// ) {
+// 	if (!command_exists(command, minishell))
+// 	{
+// 		ft_eprintf("minishell: %s: command not found\n", command->argv[0]);
+// 		minishell->exit_status = 127;
+// 	}
+// 	else if (!can_execute_command(command, minishell))
+// 	{
+// 		ft_eprintf("minishell: %s: %s\n", command->path, strerror(errno));
+// 		minishell->exit_status = errno;
+// 	}
+// }
+
+static void	cmdfree(
+	t_command *command
+) {
+	if (command == NULL)
+		return ;
+	cmdfree_argv(command->argv);
+	free(command->path);
+	free(command);
+}
+
+static void	cmdfree_argv(
+	char **argv
+) {
+	size_t	i;
+
+	if (argv == NULL)
+		return ;
+	i = 0;
+	while (argv[i] != NULL)
+	{
+		free(argv[i]);
+		i++;
+	}
+	free(argv);
+}
+
+// static void debug_print_command_info(
+// 	t_command *command
+// ) {
+// 	size_t	i;
+
+// 	if (command == NULL)
+// 	{
+// 		printf("Command is NULL\n");
+// 		return ;
+// 	}
+// 	printf("Command info:\n");
+// 	printf("  Path: %s\n", command->path);
+// 	printf("  Argc: %d\n", command->argc);
+// 	printf("  Argv:\n");
+// 	for (i = 0; i < (size_t)command->argc; i++)
+// 		printf("    arg[%zu]: %s\n", i, command->argv[i]);
+// 	printf("  Infile FD: %d\n", command->infile);
+// 	printf("  Outfile FD: %d\n", command->outfile);
+// 	printf("--------------------------\n");
+// }

include/builtins.h

@@ -6,34 +6,43 @@
 /*   By: sede-san <sede-san@student.42madrid.com    +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2025/10/29 22:09:51 by sede-san          #+#    #+#             */
-/*   Updated: 2025/11/02 03:13:46 by sede-san         ###   ########.fr       */
+/*   Updated: 2026/02/08 19:42:50 by sede-san         ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
 #ifndef BUILTINS_H
 # define BUILTINS_H
 
-# include "minishell.h"
 # include "ft_args.h"
+# include "minishell.h"
+# include "core.h"
+
+typedef unsigned char   (*t_builtin_func)(t_command cmd, t_minishell *minishell);
 
 /******************************************************************************/
 /*                                 Functions                                  */
 /******************************************************************************/
 
-// cd.c
+/* builtins.c */
 
-extern u_int8_t	builtin_cd(t_command cmd, t_minishell *msh);
+extern u_int8_t	set_builtins(t_minishell *minishell);
 
-// echo.c
+extern u_int8_t	is_builtin(const char *command_name, t_minishell *minishell);
 
-extern u_int8_t	builtin_echo(t_command cmd);
+/* cd.c */
 
-// exit.c
+extern u_int8_t	builtin_cd(t_command cmd, t_minishell *minishell);
 
-extern u_int8_t	builtin_exit(t_command cmd, t_minishell *msh);
+/* echo.c */
 
-// pwd.c
+extern u_int8_t	builtin_echo(t_command cmd, t_minishell *minishell);
 
-extern u_int8_t	builtin_pwd(t_command cmd, t_minishell *msh);
+/* exit.c */
+
+extern u_int8_t	builtin_exit(t_command cmd, t_minishell *minishell);
+
+/* pwd.c */
+
+extern u_int8_t	builtin_pwd(t_command cmd, t_minishell *minishell);
 
 #endif /* BUILTINS_H */

include/core.h

@@ -6,7 +6,7 @@
 /*   By: sede-san <sede-san@student.42madrid.com    +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2025/10/22 19:10:13 by sede-san          #+#    #+#             */
-/*   Updated: 2025/10/30 16:05:48 by sede-san         ###   ########.fr       */
+/*   Updated: 2026/02/09 18:45:41 by sede-san         ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -34,7 +34,7 @@ typedef struct s_command	t_command;
  */
 typedef struct s_variables
 {
-	char	**environment;
+	t_hashmap	*environment;
 	// char	**internal;
 }	t_variables;
 
@@ -49,8 +49,9 @@ typedef struct s_variables
 typedef struct s_minishell
 {
 	t_variables	variables;
-	u_int8_t	exit_status;
+	t_hashmap	*builtins;
-	u_int8_t	exit;
+	uint8_t		exit_status;
+	bool		exit;
 }	t_minishell;
 
 /**
@@ -68,8 +69,19 @@ typedef struct s_command
 	int		argc;
 	char	**argv;
 	char	*path;
+	t_list	*redirections;
 }	t_command;
 
+/**
+ * @brief Default shell prompt string
+ */
+# define DEFAULT_PS1 "minishell > "
+
+/**
+ * @brief Default secondary prompt string for multiline input
+ */
+# define DEFAULT_PS2 "> "
+
 /******************************************************************************/
 /*                                 Functions                                  */
 /******************************************************************************/
@@ -78,8 +90,21 @@ typedef struct s_command
 
 extern int		minishell_init(t_minishell *minishell, char **envp);
 
-extern u_int8_t	minishell_run(t_minishell *minishell);
+extern uint8_t	minishell_run(t_minishell *minishell);
 
 extern void		minishell_clear(t_minishell *minishell);
 
+/* environment.c */
+
+extern void		set_envp(char **envp, t_minishell *msh);
+
+extern void		set_env(const char *env_name, char *env_value,
+					t_minishell *msh);
+
+extern char		**get_envp(t_minishell *msh);
+
+extern void		free_envp(char **envp);
+
+extern char		*get_env(const char *env_name, t_minishell *msh);
+
 #endif /* CORE_H */

include/executor.h

@@ -6,7 +6,7 @@
 /*   By: sede-san <sede-san@student.42madrid.com    +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2025/10/28 13:08:33 by sede-san          #+#    #+#             */
-/*   Updated: 2025/10/28 14:20:23 by sede-san         ###   ########.fr       */
+/*   Updated: 2026/02/08 21:32:56 by sede-san         ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -14,6 +14,18 @@
 # define EXECUTOR_H
 
 # include "minishell.h"
+# include "core.h"
+# include <stdint.h>
+
+# define READ_PIPE 0
+# define WRITE_PIPE 1
+
+typedef struct s_pipeline
+{
+    int prev_read_fd;
+    int pipefd[2];
+}   t_pipeline;
+
 
 /******************************************************************************/
 /*                                 Functions                                  */
@@ -21,6 +33,9 @@
 
 // executor.c
 
-extern u_int8_t	execute(t_command command, t_minishell *minishell);
+# define PIPE_ERROR -1
+# define FORK_ERROR -1
+
+extern uint8_t execute(t_list *command, t_minishell *minishell);
 
 #endif /* EXECUTOR_H */

include/minishell.h

@@ -6,7 +6,7 @@
 /*   By: sede-san <sede-san@student.42madrid.com    +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2025/10/20 16:35:10 by sede-san          #+#    #+#             */
-/*   Updated: 2025/10/30 12:20:08 by sede-san         ###   ########.fr       */
+/*   Updated: 2026/02/09 18:38:16 by sede-san         ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -16,10 +16,8 @@
 # include "libft.h"
 # include "ft_printf.h"
 # include "chardefs.h"
-# include "core.h"
+# include <stdbool.h>
-# include "parser.h"
+# include <stdint.h>
-# include "executor.h"
-# include "builtins.h"
 # include <readline/readline.h>	// readline(3), rl_clear_history(),
 								// rl_on_new_line(), rl_replace_line(),
 								// rl_redisplay()

include/parser.h

@@ -6,7 +6,7 @@
 /*   By: sede-san <sede-san@student.42madrid.com    +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2025/10/22 19:03:51 by sede-san          #+#    #+#             */
-/*   Updated: 2025/10/30 12:44:51 by sede-san         ###   ########.fr       */
+/*   Updated: 2026/02/09 21:19:02 by sede-san         ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -14,6 +14,40 @@
 # define PARSER_H
 
 # include "minishell.h"
+# include "core.h"
+# include "builtins.h"
+
+# define TOKENS_COUNT 5
+
+typedef enum e_token_type
+{
+    TOKEN_WORD,
+    TOKEN_PIPE,
+    TOKEN_REDIRECT_IN,
+    TOKEN_REDIRECT_OUT,
+    TOKEN_APPEND,
+    TOKEN_HEREDOC
+}	t_token_type;
+
+typedef struct s_token
+{
+    t_token_type	type;
+    char		    *value;
+}   t_token;
+
+typedef enum e_redirection_type
+{
+    REDIRECT_IN,
+    REDIRECT_OUT,
+    APPEND,
+    HEREDOC
+}	t_redirection_type;
+
+typedef struct s_redirection
+{
+    t_redirection_type	type;
+    char			    *target;
+}   t_redirection;
 
 /******************************************************************************/
 /*                                 Functions                                  */
@@ -21,6 +55,6 @@
 
 // parser.c
 
-extern t_command	parse(char *line, t_minishell *minishell);
+extern t_list   *parse(char *line, t_minishell *minishell);
 
 #endif /* PARSER_H */

minishell-codex/Makefile

@@ -0,0 +1,27 @@
+NAME := minishell
+CC := cc
+CFLAGS := -Wall -Wextra -Werror -g
+INCLUDES := -Iinclude
+READLINE_LIBS := -lreadline -lncurses
+
+SRCS := $(shell find src -name '*.c')
+OBJS := $(SRCS:src/%.c=build/%.o)
+
+all: $(NAME)
+
+$(NAME): $(OBJS)
+	$(CC) $(CFLAGS) $(OBJS) $(READLINE_LIBS) -o $(NAME)
+
+build/%.o: src/%.c
+	@mkdir -p $(dir $@)
+	$(CC) $(CFLAGS) $(INCLUDES) -c $< -o $@
+
+clean:
+	rm -rf build
+
+fclean: clean
+	rm -f $(NAME)
+
+re: fclean all
+
+.PHONY: all clean fclean re

minishell-codex/docs/defensa.md

@@ -0,0 +1,72 @@
+# Minishell - Guion de defensa (version codex)
+
+Este guion esta alineado con la estructura real en `minishell-codex/`.
+
+## 1. Explicacion corta del proyecto
+- Minishell es un interprete de comandos interactivo.
+- Implementa pipes, redirecciones, variables y builtins basicos.
+- Se basa en el flujo: lectura -> lexer -> parser -> expansion -> ejecucion.
+
+## 2. Flujo completo (paso a paso)
+1. `readline()` muestra el prompt y devuelve la linea.
+2. `lex_line()` divide la linea en tokens (`TOK_WORD`, `TOK_PIPE`, redirecciones).
+3. `parse_tokens()` construye la pipeline con comandos y redirecciones.
+4. `expand_pipeline()` aplica expansion de `$VAR` y `$?` respetando comillas.
+5. `execute_pipeline()` resuelve `PATH`, prepara heredocs y ejecuta.
+
+## 3. Estructuras clave
+- `t_token`: tipo y texto de tokens (`minishell-codex/include/minishell.h`).
+- `t_command`: argv, redirecciones, path.
+- `t_pipeline`: lista de comandos.
+- `t_redir`: tipo, target y fd.
+- `t_shell`: estado global (env, exit_status, flags).
+
+## 4. Lexer (por que esta separado)
+- Maneja comillas y metacaracteres sin mezclar con ejecucion.
+- Detecta errores de comillas sin cerrar.
+- Facilita el parseo posterior.
+
+## 5. Parser
+- Convierte tokens en comandos reales.
+- Cada `TOK_PIPE` crea un nuevo comando.
+- Redirecciones se guardan en lista separada (`t_redir`).
+- Valida errores (pipe sin comando, redireccion sin destino).
+
+## 6. Expansion
+- `expand_pipeline()` recorre argv y targets de redireccion.
+- Reglas:
+  - En comilla simple no se expande.
+  - En comilla doble si se expande.
+  - `$?` es el exit status anterior.
+
+## 7. Redirecciones y heredoc
+- `apply_redirections()` abre y hace `dup2()`.
+- `prepare_heredocs()` genera un pipe con el contenido.
+- Heredoc no se mete en el historial.
+
+## 8. Ejecucion y pipes
+- Si hay un solo builtin, se ejecuta en el padre.
+- Si hay pipeline, todos se forkean.
+- Se conectan con `pipe()` y `dup2()`.
+- Se espera a todos, y el exit status es el del ultimo comando.
+
+## 9. Builtins
+- Implementados en `src/builtins/builtins.c`.
+- `echo`, `cd`, `pwd`, `env`, `export`, `unset`, `exit`.
+- `export` valida identificadores y permite `KEY=VALUE`.
+
+## 10. Señales
+- Una sola global: `g_signal`.
+- `ctrl-C`: limpia linea y muestra prompt.
+- `ctrl-\`: se ignora en interactivo.
+- En child se restauran señales por defecto.
+
+## 11. Ejemplos rapidos para demostrar
+- Pipes: `ls | wc -l`
+- Redireccion: `echo hola > out.txt`
+- Heredoc: `cat << EOF` -> texto -> `EOF`
+- Expansion: `echo $HOME`, `echo $?`
+
+## 12. Mensaje final recomendado
+"Separar lexer, parser, expansion y ejecucion me permitio mantener el codigo claro
+ y replicar el comportamiento de bash para el minimo requerido por el subject."

minishell-codex/docs/tests_manual.md

@@ -0,0 +1,59 @@
+# Minishell - Checklist de pruebas manuales
+
+Ejecuta en `minishell-codex/`:
+- `make`
+- `./minishell`
+
+## 1. Prompt y salida
+- Iniciar y salir con `ctrl-D`.
+- `exit` debe cerrar el shell con el ultimo status.
+
+## 2. Comandos simples
+- `ls`
+- `pwd`
+- `echo hola`
+
+## 3. Builtins
+- `echo -n hola` (sin salto de linea)
+- `cd /` luego `pwd`
+- `export TEST=42` luego `env | grep TEST`
+- `unset TEST` luego `env | grep TEST` (no debe aparecer)
+- `env` sin argumentos
+- `exit 2`
+
+## 4. Expansion
+- `echo $HOME`
+- `echo $?` despues de un comando que falle (ej: `ls noexiste`)
+- `echo '$HOME'` (no expande)
+- `echo "$HOME"` (si expande)
+
+## 5. Pipes
+- `ls | wc -l`
+- `echo hola | cat`
+- `cat /etc/passwd | grep root | wc -l`
+
+## 6. Redirecciones
+- `echo hola > out.txt` y luego `cat out.txt`
+- `echo 1 >> out.txt` y luego `cat out.txt`
+- `cat < out.txt`
+
+## 7. Heredoc
+- `cat << EOF`
+  - escribir varias lineas
+  - `EOF`
+- Ver que se imprime todo lo escrito.
+
+## 8. Comillas
+- `echo "a b c"` (una sola palabra)
+- `echo 'a b c'` (una sola palabra)
+- `echo "a 'b' c"`
+
+## 9. Errores de parseo
+- `| ls` (no debe ejecutar)
+- `echo hola >` (error)
+- `echo "hola` (comillas sin cerrar)
+
+## 10. Senales
+- `ctrl-C` en prompt: debe limpiar linea y mostrar prompt nuevo.
+- `sleep 5` y `ctrl-C`: debe interrumpir el proceso.
+- `ctrl-\` no debe imprimir nada en prompt interactivo.

minishell-codex/include/minishell.h

@@ -0,0 +1,136 @@
+#ifndef MINISHELL_H
+#define MINISHELL_H
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <signal.h>
+#include <sys/wait.h>
+#include <sys/types.h>
+#include <termios.h>
+#include <readline/readline.h>
+#include <readline/history.h>
+
+#define MS_PROMPT "minishell> "
+
+extern int g_signal;
+
+typedef enum e_tokentype
+{
+	TOK_WORD,
+	TOK_PIPE,
+	TOK_REDIR_IN,
+	TOK_REDIR_OUT,
+	TOK_REDIR_APPEND,
+	TOK_HEREDOC
+} t_tokentype;
+
+typedef struct s_token
+{
+	char *text;
+	t_tokentype type;
+	struct s_token *next;
+} t_token;
+
+typedef enum e_redirtype
+{
+	REDIR_IN,
+	REDIR_OUT,
+	REDIR_APPEND,
+	REDIR_HEREDOC
+} t_redirtype;
+
+typedef struct s_redir
+{
+	t_redirtype type;
+	char *target;
+	int fd;
+	struct s_redir *next;
+} t_redir;
+
+typedef struct s_command
+{
+	char **argv;
+	int argc;
+	char *path;
+	t_redir *redirs;
+} t_command;
+
+typedef struct s_pipeline
+{
+	t_command **cmds;
+	size_t count;
+} t_pipeline;
+
+typedef struct s_env
+{
+	char *key;
+	char *value;
+	struct s_env *next;
+} t_env;
+
+typedef struct s_shell
+{
+	t_env *env;
+	int exit_status;
+	int last_status;
+	int exit_requested;
+	int interactive;
+} t_shell;
+
+/* core */
+void ms_init(t_shell *sh, char **envp);
+void ms_loop(t_shell *sh);
+void ms_cleanup(t_shell *sh);
+void ms_setup_signals(t_shell *sh);
+void ms_set_child_signals(void);
+void ms_set_heredoc_signals(void);
+
+/* parser */
+t_token *lex_line(const char *line, int *error);
+void free_tokens(t_token *toks);
+
+t_pipeline *parse_tokens(t_token *toks, int *error);
+void free_pipeline(t_pipeline *p);
+
+int expand_pipeline(t_pipeline *p, t_shell *sh);
+
+/* executor */
+int execute_pipeline(t_pipeline *p, t_shell *sh);
+int prepare_heredocs(t_pipeline *p, t_shell *sh);
+int apply_redirections(t_command *cmd, int *saved_stdin, int *saved_stdout);
+void restore_redirections(int saved_stdin, int saved_stdout);
+char *resolve_path(const char *cmd, t_shell *sh);
+
+/* env */
+void env_init(t_shell *sh, char **envp);
+void env_clear(t_shell *sh);
+char *env_get(t_shell *sh, const char *key);
+int env_set(t_shell *sh, const char *key, const char *value);
+int env_unset(t_shell *sh, const char *key);
+char **env_to_envp(t_shell *sh);
+void env_free_envp(char **envp);
+void env_print(t_shell *sh);
+
+/* builtins */
+int is_builtin(const char *name);
+int exec_builtin(t_command *cmd, t_shell *sh);
+
+/* utils */
+int ms_is_space(int c);
+int ms_is_alpha(int c);
+int ms_is_alnum(int c);
+int ms_is_digit(int c);
+char *ms_strdup(const char *s);
+char *ms_strndup(const char *s, size_t n);
+char *ms_strjoin(const char *a, const char *b);
+char *ms_strjoin3(const char *a, const char *b, const char *c);
+char *ms_substr(const char *s, size_t start, size_t len);
+char **ms_split(const char *s, char delim);
+void ms_free_split(char **sp);
+char *ms_itoa(int n);
+
+#endif

minishell-codex/src/builtins/builtins.c

@@ -0,0 +1,221 @@
+#include "minishell.h"
+
+static int builtin_echo(t_command *cmd, t_shell *sh);
+static int builtin_cd(t_command *cmd, t_shell *sh);
+static int builtin_pwd(t_command *cmd, t_shell *sh);
+static int builtin_env(t_command *cmd, t_shell *sh);
+static int builtin_export(t_command *cmd, t_shell *sh);
+static int builtin_unset(t_command *cmd, t_shell *sh);
+static int builtin_exit(t_command *cmd, t_shell *sh);
+
+int is_builtin(const char *name)
+{
+	if (!name)
+		return 0;
+	return (strcmp(name, "echo") == 0 || strcmp(name, "cd") == 0
+		|| strcmp(name, "pwd") == 0 || strcmp(name, "env") == 0
+		|| strcmp(name, "export") == 0 || strcmp(name, "unset") == 0
+		|| strcmp(name, "exit") == 0);
+}
+
+int exec_builtin(t_command *cmd, t_shell *sh)
+{
+	if (strcmp(cmd->argv[0], "echo") == 0)
+		return builtin_echo(cmd, sh);
+	if (strcmp(cmd->argv[0], "cd") == 0)
+		return builtin_cd(cmd, sh);
+	if (strcmp(cmd->argv[0], "pwd") == 0)
+		return builtin_pwd(cmd, sh);
+	if (strcmp(cmd->argv[0], "env") == 0)
+		return builtin_env(cmd, sh);
+	if (strcmp(cmd->argv[0], "export") == 0)
+		return builtin_export(cmd, sh);
+	if (strcmp(cmd->argv[0], "unset") == 0)
+		return builtin_unset(cmd, sh);
+	if (strcmp(cmd->argv[0], "exit") == 0)
+		return builtin_exit(cmd, sh);
+	return 1;
+}
+
+static int builtin_echo(t_command *cmd, t_shell *sh)
+{
+	int i = 1;
+	int newline = 1;
+
+	(void)sh;
+	while (cmd->argv[i] && cmd->argv[i][0] == '-' && cmd->argv[i][1] == 'n')
+	{
+		int j = 2;
+		while (cmd->argv[i][j] == 'n')
+			j++;
+		if (cmd->argv[i][j] != '\0')
+			break;
+		newline = 0;
+		i++;
+	}
+	while (cmd->argv[i])
+	{
+		printf("%s", cmd->argv[i]);
+		if (cmd->argv[i + 1])
+			printf(" ");
+		i++;
+	}
+	if (newline)
+		printf("\n");
+	return 0;
+}
+
+static int builtin_pwd(t_command *cmd, t_shell *sh)
+{
+	char buf[4096];
+	(void)cmd;
+	(void)sh;
+	if (getcwd(buf, sizeof(buf)))
+		printf("%s\n", buf);
+	return 0;
+}
+
+static int builtin_cd(t_command *cmd, t_shell *sh)
+{
+	char *path;
+	char cwd[4096];
+
+	if (cmd->argc > 2)
+	{
+		fprintf(stderr, "minishell: cd: too many arguments\n");
+		return 1;
+	}
+	if (cmd->argc == 1)
+		path = env_get(sh, "HOME");
+	else
+		path = cmd->argv[1];
+	if (!path)
+	{
+		fprintf(stderr, "minishell: cd: HOME not set\n");
+		return 1;
+	}
+	if (getcwd(cwd, sizeof(cwd)))
+		env_set(sh, "OLDPWD", cwd);
+	if (chdir(path) != 0)
+	{
+		perror("minishell: cd");
+		return 1;
+	}
+	if (getcwd(cwd, sizeof(cwd)))
+		env_set(sh, "PWD", cwd);
+	return 0;
+}
+
+static int builtin_env(t_command *cmd, t_shell *sh)
+{
+	if (cmd->argc > 1)
+	{
+		fprintf(stderr, "minishell: env: too many arguments\n");
+		return 1;
+	}
+	env_print(sh);
+	return 0;
+}
+
+static int valid_identifier(const char *s)
+{
+	int i = 0;
+	if (!s || !ms_is_alpha((unsigned char)s[0]))
+		return 0;
+	while (s[i])
+	{
+		if (!ms_is_alnum((unsigned char)s[i]))
+			return 0;
+		i++;
+	}
+	return 1;
+}
+
+static int builtin_export(t_command *cmd, t_shell *sh)
+{
+	int i = 1;
+	if (cmd->argc == 1)
+	{
+		env_print(sh);
+		return 0;
+	}
+	while (cmd->argv[i])
+	{
+		char *eq = strchr(cmd->argv[i], '=');
+		if (eq)
+		{
+			char *key = ms_strndup(cmd->argv[i], (size_t)(eq - cmd->argv[i]));
+			char *val = ms_strdup(eq + 1);
+			if (!valid_identifier(key))
+				fprintf(stderr, "minishell: export: `%s': not a valid identifier\n", cmd->argv[i]);
+			else
+				env_set(sh, key, val);
+			free(key);
+			free(val);
+		}
+		else
+		{
+			if (!valid_identifier(cmd->argv[i]))
+				fprintf(stderr, "minishell: export: `%s': not a valid identifier\n", cmd->argv[i]);
+			else
+				env_set(sh, cmd->argv[i], "");
+		}
+		i++;
+	}
+	return 0;
+}
+
+static int builtin_unset(t_command *cmd, t_shell *sh)
+{
+	int i = 1;
+	while (cmd->argv[i])
+	{
+		env_unset(sh, cmd->argv[i]);
+		i++;
+	}
+	return 0;
+}
+
+static int builtin_exit(t_command *cmd, t_shell *sh)
+{
+	long code = sh->exit_status;
+	int i = 0;
+
+	if (sh->interactive)
+		printf("exit\n");
+	if (cmd->argc == 1)
+	{
+		sh->exit_requested = 1;
+		sh->exit_status = (int)(code & 0xFF);
+		return sh->exit_status;
+	}
+	if (cmd->argc > 2)
+	{
+		fprintf(stderr, "minishell: exit: too many arguments\n");
+		return 1;
+	}
+	if (cmd->argv[1][i] == '+' || cmd->argv[1][i] == '-')
+		i++;
+	if (cmd->argv[1][i] == '\0')
+	{
+		fprintf(stderr, "minishell: exit: %s: numeric argument required\n", cmd->argv[1]);
+		sh->exit_requested = 1;
+		sh->exit_status = 2;
+		return 2;
+	}
+	while (cmd->argv[1][i])
+	{
+		if (!ms_is_digit((unsigned char)cmd->argv[1][i]))
+		{
+			fprintf(stderr, "minishell: exit: %s: numeric argument required\n", cmd->argv[1]);
+			sh->exit_requested = 1;
+			sh->exit_status = 2;
+			return 2;
+		}
+		i++;
+	}
+	code = strtol(cmd->argv[1], NULL, 10);
+	sh->exit_requested = 1;
+	sh->exit_status = (int)(code & 0xFF);
+	return sh->exit_status;
+}

minishell-codex/src/core/init.c

@@ -0,0 +1,18 @@
+#include "minishell.h"
+
+void ms_init(t_shell *sh, char **envp)
+{
+	memset(sh, 0, sizeof(*sh));
+	sh->interactive = isatty(STDIN_FILENO);
+	sh->exit_status = 0;
+	sh->last_status = 0;
+	sh->exit_requested = 0;
+	env_init(sh, envp);
+	ms_setup_signals(sh);
+}
+
+void ms_cleanup(t_shell *sh)
+{
+	env_clear(sh);
+	rl_clear_history();
+}

minishell-codex/src/core/loop.c

@@ -0,0 +1,46 @@
+#include "minishell.h"
+
+static void handle_line(t_shell *sh, char *line)
+{
+	int error = 0;
+	t_token *toks = NULL;
+	t_pipeline *p = NULL;
+
+	toks = lex_line(line, &error);
+	if (error)
+	{
+		free_tokens(toks);
+		return;
+	}
+	p = parse_tokens(toks, &error);
+	free_tokens(toks);
+	if (error || !p)
+	{
+		free_pipeline(p);
+		return;
+	}
+	if (expand_pipeline(p, sh) != 0)
+	{
+		free_pipeline(p);
+		return;
+	}
+	sh->exit_status = execute_pipeline(p, sh);
+	sh->last_status = sh->exit_status;
+	free_pipeline(p);
+}
+
+void ms_loop(t_shell *sh)
+{
+	char *line;
+
+	while (!sh->exit_requested)
+	{
+		line = readline(MS_PROMPT);
+		if (!line)
+			break;
+		if (line[0] != '\0')
+			add_history(line);
+		handle_line(sh, line);
+		free(line);
+	}
+}

minishell-codex/src/core/signals.c

@@ -0,0 +1,46 @@
+#include "minishell.h"
+
+int g_signal = 0;
+
+static void sigint_handler(int sig)
+{
+	g_signal = sig;
+	write(STDOUT_FILENO, "\n", 1);
+	rl_on_new_line();
+	rl_replace_line("", 0);
+	rl_redisplay();
+}
+
+static void sigquit_handler(int sig)
+{
+	g_signal = sig;
+	(void)sig;
+}
+
+void ms_setup_signals(t_shell *sh)
+{
+	struct sigaction sa_int;
+	struct sigaction sa_quit;
+
+	(void)sh;
+	memset(&sa_int, 0, sizeof(sa_int));
+	memset(&sa_quit, 0, sizeof(sa_quit));
+	sa_int.sa_handler = sigint_handler;
+	sa_quit.sa_handler = sigquit_handler;
+	sigemptyset(&sa_int.sa_mask);
+	sigemptyset(&sa_quit.sa_mask);
+	sigaction(SIGINT, &sa_int, NULL);
+	sigaction(SIGQUIT, &sa_quit, NULL);
+}
+
+void ms_set_child_signals(void)
+{
+	signal(SIGINT, SIG_DFL);
+	signal(SIGQUIT, SIG_DFL);
+}
+
+void ms_set_heredoc_signals(void)
+{
+	signal(SIGINT, SIG_DFL);
+	signal(SIGQUIT, SIG_IGN);
+}

minishell-codex/src/env/env.c

@@ -0,0 +1,171 @@
+#include "minishell.h"
+
+static t_env *env_new(const char *key, const char *value)
+{
+	t_env *n = (t_env *)calloc(1, sizeof(t_env));
+	if (!n)
+		return NULL;
+	n->key = ms_strdup(key);
+	n->value = value ? ms_strdup(value) : ms_strdup("");
+	if (!n->key || !n->value)
+	{
+		free(n->key);
+		free(n->value);
+		free(n);
+		return NULL;
+	}
+	return n;
+}
+
+void env_init(t_shell *sh, char **envp)
+{
+	int i;
+	char *eq;
+
+	sh->env = NULL;
+	if (!envp)
+		return;
+	i = 0;
+	while (envp[i])
+	{
+		eq = strchr(envp[i], '=');
+		if (eq)
+		{
+			char *key = ms_strndup(envp[i], (size_t)(eq - envp[i]));
+			char *val = ms_strdup(eq + 1);
+			env_set(sh, key, val);
+			free(key);
+			free(val);
+		}
+		i++;
+	}
+}
+
+void env_clear(t_shell *sh)
+{
+	t_env *cur = sh->env;
+	t_env *next;
+
+	while (cur)
+	{
+		next = cur->next;
+		free(cur->key);
+		free(cur->value);
+		free(cur);
+		cur = next;
+	}
+	sh->env = NULL;
+}
+
+char *env_get(t_shell *sh, const char *key)
+{
+	t_env *cur = sh->env;
+
+	while (cur)
+	{
+		if (strcmp(cur->key, key) == 0)
+			return cur->value;
+		cur = cur->next;
+	}
+	return NULL;
+}
+
+int env_set(t_shell *sh, const char *key, const char *value)
+{
+	t_env *cur = sh->env;
+	t_env *prev = NULL;
+
+	while (cur)
+	{
+		if (strcmp(cur->key, key) == 0)
+		{
+			char *dup = ms_strdup(value ? value : "");
+			if (!dup)
+				return 1;
+			free(cur->value);
+			cur->value = dup;
+			return 0;
+		}
+		prev = cur;
+		cur = cur->next;
+	}
+	cur = env_new(key, value);
+	if (!cur)
+		return 1;
+	if (prev)
+		prev->next = cur;
+	else
+		sh->env = cur;
+	return 0;
+}
+
+int env_unset(t_shell *sh, const char *key)
+{
+	t_env *cur = sh->env;
+	t_env *prev = NULL;
+
+	while (cur)
+	{
+		if (strcmp(cur->key, key) == 0)
+		{
+			if (prev)
+				prev->next = cur->next;
+			else
+				sh->env = cur->next;
+			free(cur->key);
+			free(cur->value);
+			free(cur);
+			return 0;
+		}
+		prev = cur;
+		cur = cur->next;
+	}
+	return 0;
+}
+
+char **env_to_envp(t_shell *sh)
+{
+	char **envp;
+	int count = 0;
+	t_env *cur = sh->env;
+	int i = 0;
+
+	while (cur)
+	{
+		count++;
+		cur = cur->next;
+	}
+	envp = (char **)calloc((size_t)count + 1, sizeof(char *));
+	if (!envp)
+		return NULL;
+	cur = sh->env;
+	while (cur)
+	{
+		char *kv = ms_strjoin3(cur->key, "=", cur->value);
+		envp[i++] = kv;
+		cur = cur->next;
+	}
+	envp[i] = NULL;
+	return envp;
+}
+
+void env_free_envp(char **envp)
+{
+	int i = 0;
+	if (!envp)
+		return;
+	while (envp[i])
+		free(envp[i++]);
+	free(envp);
+}
+
+void env_print(t_shell *sh)
+{
+	t_env *cur = sh->env;
+	while (cur)
+	{
+		if (cur->value)
+			printf("%s=%s\n", cur->key, cur->value);
+		cur = cur->next;
+	}
+}

minishell-codex/src/executor/exec.c

@@ -0,0 +1,134 @@
+#include "minishell.h"
+
+static int exec_external(t_command *cmd, t_shell *sh)
+{
+	char **envp = env_to_envp(sh);
+	if (!envp)
+		return 1;
+	execve(cmd->path, cmd->argv, envp);
+	perror(cmd->path);
+	env_free_envp(envp);
+	return 126;
+}
+
+static int run_command_child(t_command *cmd, t_shell *sh)
+{
+	int saved_in, saved_out;
+
+	if (apply_redirections(cmd, &saved_in, &saved_out) != 0)
+		return 1;
+	if (is_builtin(cmd->argv[0]))
+		return exec_builtin(cmd, sh);
+	return exec_external(cmd, sh);
+}
+
+static int run_command_parent_builtin(t_command *cmd, t_shell *sh)
+{
+	int saved_in, saved_out;
+	int status;
+
+	if (apply_redirections(cmd, &saved_in, &saved_out) != 0)
+		return 1;
+	status = exec_builtin(cmd, sh);
+	restore_redirections(saved_in, saved_out);
+	return status;
+}
+
+static int setup_pipes(int idx, int count, int pipefd[2])
+{
+	if (idx + 1 >= count)
+		return 0;
+	if (pipe(pipefd) == -1)
+		return 1;
+	return 0;
+}
+
+static void setup_child_fds(int idx, int count, int prev_read, int pipefd[2])
+{
+	if (prev_read != -1)
+	{
+		dup2(prev_read, STDIN_FILENO);
+		close(prev_read);
+	}
+	if (idx + 1 < count)
+	{
+		dup2(pipefd[1], STDOUT_FILENO);
+		close(pipefd[0]);
+		close(pipefd[1]);
+	}
+}
+
+static void close_parent_fds(int idx, int count, int *prev_read, int pipefd[2])
+{
+	if (*prev_read != -1)
+		close(*prev_read);
+	if (idx + 1 < count)
+	{
+		close(pipefd[1]);
+		*prev_read = pipefd[0];
+	}
+	else
+		*prev_read = -1;
+}
+
+int execute_pipeline(t_pipeline *p, t_shell *sh)
+{
+	int i;
+	int prev_read = -1;
+	pid_t *pids;
+	int status = 0;
+
+	if (!p || p->count == 0)
+		return 0;
+	if (prepare_heredocs(p, sh) != 0)
+		return sh->exit_status;
+	for (size_t k = 0; k < p->count; k++)
+	{
+		if (!p->cmds[k]->argv || !p->cmds[k]->argv[0])
+			return 1;
+		free(p->cmds[k]->path);
+		p->cmds[k]->path = resolve_path(p->cmds[k]->argv[0], sh);
+	}
+	if (p->count == 1 && is_builtin(p->cmds[0]->argv[0]))
+		return run_command_parent_builtin(p->cmds[0], sh);
+	pids = (pid_t *)calloc(p->count, sizeof(pid_t));
+	if (!pids)
+		return 1;
+	for (i = 0; i < (int)p->count; i++)
+	{
+		int pipefd[2] = {-1, -1};
+		if (setup_pipes(i, (int)p->count, pipefd))
+			break;
+		pids[i] = fork();
+		if (pids[i] == 0)
+		{
+			ms_set_child_signals();
+			setup_child_fds(i, (int)p->count, prev_read, pipefd);
+			if (!p->cmds[i]->path)
+			{
+				fprintf(stderr, "minishell: %s: command not found\n", p->cmds[i]->argv[0]);
+				exit(127);
+			}
+			status = run_command_child(p->cmds[i], sh);
+			exit(status);
+		}
+		close_parent_fds(i, (int)p->count, &prev_read, pipefd);
+	}
+	for (i = 0; i < (int)p->count; i++)
+	{
+		int wstatus = 0;
+		if (pids[i] > 0)
+		{
+			waitpid(pids[i], &wstatus, 0);
+			if (i == (int)p->count - 1)
+			{
+				if (WIFEXITED(wstatus))
+					status = WEXITSTATUS(wstatus);
+				else if (WIFSIGNALED(wstatus))
+					status = 128 + WTERMSIG(wstatus);
+			}
+		}
+	}
+	free(pids);
+	return status;
+}

minishell-codex/src/executor/path.c

@@ -0,0 +1,41 @@
+#include "minishell.h"
+
+static int has_slash(const char *s)
+{
+	return (s && strchr(s, '/'));
+}
+
+char *resolve_path(const char *cmd, t_shell *sh)
+{
+	char *path_env;
+	char **parts;
+	char *candidate;
+	int i;
+
+	if (!cmd)
+		return NULL;
+	if (is_builtin(cmd))
+		return ms_strdup(cmd);
+	if (has_slash(cmd))
+		return ms_strdup(cmd);
+	path_env = env_get(sh, "PATH");
+	if (!path_env)
+		return NULL;
+	parts = ms_split(path_env, ':');
+	if (!parts)
+		return NULL;
+	i = 0;
+	while (parts[i])
+	{
+		candidate = ms_strjoin3(parts[i], "/", cmd);
+		if (candidate && access(candidate, X_OK) == 0)
+		{
+			ms_free_split(parts);
+			return candidate;
+		}
+		free(candidate);
+		i++;
+	}
+	ms_free_split(parts);
+	return NULL;
+}

minishell-codex/src/executor/redir.c

@@ -0,0 +1,108 @@
+#include "minishell.h"
+
+static int open_redir(t_redir *r)
+{
+	if (r->type == REDIR_IN)
+		return open(r->target, O_RDONLY);
+	if (r->type == REDIR_OUT)
+		return open(r->target, O_WRONLY | O_CREAT | O_TRUNC, 0644);
+	if (r->type == REDIR_APPEND)
+		return open(r->target, O_WRONLY | O_CREAT | O_APPEND, 0644);
+	return -1;
+}
+
+int prepare_heredocs(t_pipeline *p, t_shell *sh)
+{
+	size_t i;
+
+	g_signal = 0;
+	for (i = 0; i < p->count; i++)
+	{
+		t_redir *r = p->cmds[i]->redirs;
+		while (r)
+		{
+			if (r->type == REDIR_HEREDOC)
+			{
+				int fds[2];
+				char *line;
+				ms_set_heredoc_signals();
+				if (pipe(fds) == -1)
+					return 1;
+				while (1)
+				{
+					line = readline("> ");
+					if (!line)
+						break;
+					if (strcmp(line, r->target) == 0)
+					{
+						free(line);
+						break;
+					}
+					write(fds[1], line, strlen(line));
+					write(fds[1], "\n", 1);
+					free(line);
+				}
+				close(fds[1]);
+				r->fd = fds[0];
+				ms_setup_signals(sh);
+				if (g_signal == SIGINT)
+				{
+					sh->exit_status = 130;
+					return 1;
+				}
+			}
+			r = r->next;
+		}
+	}
+	return 0;
+}
+
+int apply_redirections(t_command *cmd, int *saved_stdin, int *saved_stdout)
+{
+	t_redir *r = cmd->redirs;
+	*saved_stdin = -1;
+	*saved_stdout = -1;
+	while (r)
+	{
+		int fd = -1;
+		if (r->type == REDIR_HEREDOC)
+			fd = r->fd;
+		else
+			fd = open_redir(r);
+		if (fd == -1)
+		{
+			perror(r->target);
+			return 1;
+		}
+		if (r->type == REDIR_IN || r->type == REDIR_HEREDOC)
+		{
+			if (*saved_stdin == -1)
+				*saved_stdin = dup(STDIN_FILENO);
+			dup2(fd, STDIN_FILENO);
+		}
+		else
+		{
+			if (*saved_stdout == -1)
+				*saved_stdout = dup(STDOUT_FILENO);
+			dup2(fd, STDOUT_FILENO);
+		}
+		if (r->type != REDIR_HEREDOC)
+			close(fd);
+		r = r->next;
+	}
+	return 0;
+}
+
+void restore_redirections(int saved_stdin, int saved_stdout)
+{
+	if (saved_stdin != -1)
+	{
+		dup2(saved_stdin, STDIN_FILENO);
+		close(saved_stdin);
+	}
+	if (saved_stdout != -1)
+	{
+		dup2(saved_stdout, STDOUT_FILENO);
+		close(saved_stdout);
+	}
+}

minishell-codex/src/main.c

@@ -0,0 +1,17 @@
+#include "minishell.h"
+
+int main(int argc, char **argv, char **envp)
+{
+	t_shell sh;
+
+	(void)argv;
+	if (argc != 1)
+	{
+		fprintf(stderr, "Usage: ./minishell\n");
+		return 1;
+	}
+	ms_init(&sh, envp);
+	ms_loop(&sh);
+	ms_cleanup(&sh);
+	return sh.exit_status;
+}

minishell-codex/src/parser/expand.c

@@ -0,0 +1,113 @@
+#include "minishell.h"
+
+static void buf_append(char **buf, size_t *len, size_t *cap, const char *s)
+{
+	size_t slen;
+	char *newbuf;
+
+	if (!s)
+		return;
+	slen = strlen(s);
+	if (*len + slen + 1 > *cap)
+	{
+		*cap = (*len + slen + 1) * 2;
+		newbuf = (char *)realloc(*buf, *cap);
+		if (!newbuf)
+			return;
+		*buf = newbuf;
+	}
+	memcpy(*buf + *len, s, slen);
+	*len += slen;
+	(*buf)[*len] = '\0';
+}
+
+static void buf_append_char(char **buf, size_t *len, size_t *cap, char c)
+{
+	char tmp[2];
+	tmp[0] = c;
+	tmp[1] = '\0';
+	buf_append(buf, len, cap, tmp);
+}
+
+static char *expand_word(const char *word, t_shell *sh)
+{
+	int in_single = 0;
+	int in_double = 0;
+	size_t i = 0;
+	char *out = NULL;
+	size_t len = 0, cap = 0;
+
+	while (word && word[i])
+	{
+		if (word[i] == '\'' && !in_double)
+		{
+			in_single = !in_single;
+			i++;
+			continue;
+		}
+		if (word[i] == '"' && !in_single)
+		{
+			in_double = !in_double;
+			i++;
+			continue;
+		}
+		if (word[i] == '$' && !in_single)
+		{
+			if (word[i + 1] == '?')
+			{
+				char *v = ms_itoa(sh->last_status);
+				buf_append(&out, &len, &cap, v);
+				free(v);
+				i += 2;
+				continue;
+			}
+			if (ms_is_alpha((unsigned char)word[i + 1]))
+			{
+				size_t j = i + 1;
+				while (word[j] && ms_is_alnum((unsigned char)word[j]))
+					j++;
+				char *name = ms_strndup(word + i + 1, j - (i + 1));
+				char *val = env_get(sh, name);
+				buf_append(&out, &len, &cap, val ? val : "");
+				free(name);
+				i = j;
+				continue;
+			}
+		}
+		buf_append_char(&out, &len, &cap, word[i]);
+		i++;
+	}
+	if (!out)
+		out = ms_strdup("");
+	return out;
+}
+
+int expand_pipeline(t_pipeline *p, t_shell *sh)
+{
+	size_t i;
+	int j;
+	for (i = 0; i < p->count; i++)
+	{
+		for (j = 0; p->cmds[i]->argv && p->cmds[i]->argv[j]; j++)
+		{
+			char *neww = expand_word(p->cmds[i]->argv[j], sh);
+			free(p->cmds[i]->argv[j]);
+			p->cmds[i]->argv[j] = neww;
+		}
+		if (p->cmds[i]->redirs)
+		{
+			t_redir *r = p->cmds[i]->redirs;
+			while (r)
+			{
+				if (r->target)
+				{
+					char *nt = expand_word(r->target, sh);
+					free(r->target);
+					r->target = nt;
+				}
+				r = r->next;
+			}
+		}
+	}
+	return 0;
+}

minishell-codex/src/parser/lexer.c

@@ -0,0 +1,131 @@
+#include "minishell.h"
+
+static t_token *token_new(t_tokentype type, const char *text, size_t len)
+{
+	t_token *t = (t_token *)calloc(1, sizeof(t_token));
+	if (!t)
+		return NULL;
+	t->type = type;
+	if (text)
+		t->text = ms_strndup(text, len);
+	return t;
+}
+
+static void token_add(t_token **head, t_token *new)
+{
+	t_token *cur;
+	if (!new)
+		return;
+	if (!*head)
+	{
+		*head = new;
+		return;
+	}
+	cur = *head;
+	while (cur->next)
+		cur = cur->next;
+	cur->next = new;
+}
+
+void free_tokens(t_token *toks)
+{
+	t_token *n;
+	while (toks)
+	{
+		n = toks->next;
+		free(toks->text);
+		free(toks);
+		toks = n;
+	}
+}
+
+static int is_meta(char c)
+{
+	return (c == '|' || c == '<' || c == '>');
+}
+
+static int read_word(const char *line, size_t *i, t_token **out)
+{
+	size_t start = *i;
+	int in_single = 0;
+	int in_double = 0;
+
+	while (line[*i])
+	{
+		if (line[*i] == '\'' && !in_double)
+			in_single = !in_single;
+		else if (line[*i] == '"' && !in_single)
+			in_double = !in_double;
+		else if (!in_single && !in_double)
+		{
+			if (ms_is_space(line[*i]) || is_meta(line[*i]))
+				break;
+		}
+		(*i)++;
+	}
+	if (in_single || in_double)
+		return 1;
+	*out = token_new(TOK_WORD, line + start, *i - start);
+	return 0;
+}
+
+t_token *lex_line(const char *line, int *error)
+{
+	t_token *toks = NULL;
+	size_t i = 0;
+
+	*error = 0;
+	while (line[i])
+	{
+		if (ms_is_space(line[i]))
+		{
+			i++;
+			continue;
+		}
+		if (line[i] == '|')
+		{
+			token_add(&toks, token_new(TOK_PIPE, "|", 1));
+			i++;
+			continue;
+		}
+		if (line[i] == '<')
+		{
+			if (line[i + 1] == '<')
+			{
+				token_add(&toks, token_new(TOK_HEREDOC, "<<", 2));
+				i += 2;
+			}
+			else
+			{
+				token_add(&toks, token_new(TOK_REDIR_IN, "<", 1));
+				i++;
+			}
+			continue;
+		}
+		if (line[i] == '>')
+		{
+			if (line[i + 1] == '>')
+			{
+				token_add(&toks, token_new(TOK_REDIR_APPEND, ">>", 2));
+				i += 2;
+			}
+			else
+			{
+				token_add(&toks, token_new(TOK_REDIR_OUT, ">", 1));
+				i++;
+			}
+			continue;
+		}
+		{
+			t_token *w = NULL;
+			if (read_word(line, &i, &w))
+			{
+				*error = 1;
+				free_tokens(toks);
+				return NULL;
+			}
+			token_add(&toks, w);
+		}
+	}
+	return toks;
+}

minishell-codex/src/parser/parser.c

@@ -0,0 +1,175 @@
+#include "minishell.h"
+
+static t_command *command_new(void)
+{
+	t_command *cmd = (t_command *)calloc(1, sizeof(t_command));
+	return cmd;
+}
+
+static void command_add_arg(t_command *cmd, const char *text)
+{
+	char **new_argv;
+	int i;
+
+	if (!cmd || !text)
+		return;
+	i = cmd->argc;
+	new_argv = (char **)calloc((size_t)i + 2, sizeof(char *));
+	if (!new_argv)
+		return;
+	for (int j = 0; j < i; j++)
+		new_argv[j] = cmd->argv[j];
+	new_argv[i] = ms_strdup(text);
+	new_argv[i + 1] = NULL;
+	free(cmd->argv);
+	cmd->argv = new_argv;
+	cmd->argc += 1;
+}
+
+static void command_add_redir(t_command *cmd, t_redirtype type, const char *target)
+{
+	t_redir *r = (t_redir *)calloc(1, sizeof(t_redir));
+	t_redir *cur;
+	if (!r)
+		return;
+	r->type = type;
+	r->target = ms_strdup(target);
+	r->fd = -1;
+	r->next = NULL;
+	if (!cmd->redirs)
+	{
+		cmd->redirs = r;
+		return;
+	}
+	cur = cmd->redirs;
+	while (cur->next)
+		cur = cur->next;
+	cur->next = r;
+}
+
+static void free_redirs(t_redir *r)
+{
+	t_redir *n;
+	while (r)
+	{
+		n = r->next;
+		if (r->fd != -1)
+			close(r->fd);
+		free(r->target);
+		free(r);
+		r = n;
+	}
+}
+
+void free_pipeline(t_pipeline *p)
+{
+	size_t i;
+	if (!p)
+		return;
+	for (i = 0; i < p->count; i++)
+	{
+		if (p->cmds[i])
+		{
+			for (int j = 0; p->cmds[i]->argv && p->cmds[i]->argv[j]; j++)
+				free(p->cmds[i]->argv[j]);
+			free(p->cmds[i]->argv);
+			free(p->cmds[i]->path);
+			free_redirs(p->cmds[i]->redirs);
+			free(p->cmds[i]);
+		}
+	}
+	free(p->cmds);
+	free(p);
+}
+
+static int pipeline_add_cmd(t_pipeline *p, t_command *cmd)
+{
+	t_command **new_cmds;
+	size_t i;
+
+	new_cmds = (t_command **)calloc(p->count + 1, sizeof(t_command *));
+	if (!new_cmds)
+		return 1;
+	for (i = 0; i < p->count; i++)
+		new_cmds[i] = p->cmds[i];
+	new_cmds[p->count] = cmd;
+	free(p->cmds);
+	p->cmds = new_cmds;
+	p->count += 1;
+	return 0;
+}
+
+t_pipeline *parse_tokens(t_token *toks, int *error)
+{
+	t_pipeline *p;
+	t_command *cmd;
+	t_token *cur;
+
+	*error = 0;
+	p = (t_pipeline *)calloc(1, sizeof(t_pipeline));
+	if (!p)
+		return NULL;
+	cmd = command_new();
+	if (!cmd)
+	{
+		free(p);
+		return NULL;
+	}
+	cur = toks;
+	while (cur)
+	{
+		if (cur->type == TOK_PIPE)
+		{
+			if (cmd->argc == 0)
+			{
+				*error = 1;
+				free_pipeline(p);
+				free(cmd);
+				return NULL;
+			}
+			pipeline_add_cmd(p, cmd);
+			cmd = command_new();
+			if (!cmd)
+			{
+				*error = 1;
+				free_pipeline(p);
+				return NULL;
+			}
+			cur = cur->next;
+			continue;
+		}
+		if (cur->type == TOK_REDIR_IN || cur->type == TOK_REDIR_OUT
+			|| cur->type == TOK_REDIR_APPEND || cur->type == TOK_HEREDOC)
+		{
+			if (!cur->next || cur->next->type != TOK_WORD)
+			{
+				*error = 1;
+				free_pipeline(p);
+				free(cmd);
+				return NULL;
+			}
+			if (cur->type == TOK_REDIR_IN)
+				command_add_redir(cmd, REDIR_IN, cur->next->text);
+			else if (cur->type == TOK_REDIR_OUT)
+				command_add_redir(cmd, REDIR_OUT, cur->next->text);
+			else if (cur->type == TOK_REDIR_APPEND)
+				command_add_redir(cmd, REDIR_APPEND, cur->next->text);
+			else if (cur->type == TOK_HEREDOC)
+				command_add_redir(cmd, REDIR_HEREDOC, cur->next->text);
+			cur = cur->next->next;
+			continue;
+		}
+		if (cur->type == TOK_WORD)
+			command_add_arg(cmd, cur->text);
+		cur = cur->next;
+	}
+	if (cmd->argc == 0)
+	{
+		*error = 1;
+		free_pipeline(p);
+		free(cmd);
+		return NULL;
+	}
+	pipeline_add_cmd(p, cmd);
+	return p;
+}

minishell-codex/src/utils/char_utils.c

@@ -0,0 +1,6 @@
+#include "minishell.h"
+
+int ms_is_space(int c) { return (c == ' ' || c == '\t' || c == '\n' || c == '\r' || c == '\v' || c == '\f'); }
+int ms_is_alpha(int c) { return ((c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z') || c == '_'); }
+int ms_is_digit(int c) { return (c >= '0' && c <= '9'); }
+int ms_is_alnum(int c) { return (ms_is_alpha(c) || ms_is_digit(c)); }

minishell-codex/src/utils/split_utils.c

@@ -0,0 +1,67 @@
+#include "minishell.h"
+
+static size_t count_parts(const char *s, char delim)
+{
+	size_t count = 0;
+	int in = 0;
+	while (*s)
+	{
+		if (*s == delim)
+			in = 0;
+		else if (!in)
+		{
+			in = 1;
+			count++;
+		}
+		s++;
+	}
+	return count;
+}
+
+char **ms_split(const char *s, char delim)
+{
+	char **out;
+	size_t parts;
+	size_t i = 0;
+	size_t start = 0;
+	size_t len = 0;
+	int in = 0;
+
+	if (!s)
+		return NULL;
+	parts = count_parts(s, delim);
+	out = (char **)calloc(parts + 1, sizeof(char *));
+	if (!out)
+		return NULL;
+	while (s[i])
+	{
+		if (s[i] == delim)
+		{
+			if (in)
+			{
+				out[len++] = ms_strndup(s + start, i - start);
+				in = 0;
+			}
+		}
+		else if (!in)
+		{
+			in = 1;
+			start = i;
+		}
+		i++;
+	}
+	if (in)
+		out[len++] = ms_strndup(s + start, i - start);
+	out[len] = NULL;
+	return out;
+}
+
+void ms_free_split(char **sp)
+{
+	size_t i = 0;
+	if (!sp)
+		return;
+	while (sp[i])
+		free(sp[i++]);
+	free(sp);
+}

minishell-codex/src/utils/str_utils.c

@@ -0,0 +1,100 @@
+#include "minishell.h"
+
+char *ms_strdup(const char *s)
+{
+	char *out;
+	size_t len;
+
+	if (!s)
+		return NULL;
+	len = strlen(s);
+	out = (char *)malloc(len + 1);
+	if (!out)
+		return NULL;
+	memcpy(out, s, len);
+	out[len] = '\0';
+	return out;
+}
+
+char *ms_strndup(const char *s, size_t n)
+{
+	char *out;
+	if (!s)
+		return NULL;
+	out = (char *)malloc(n + 1);
+	if (!out)
+		return NULL;
+	memcpy(out, s, n);
+	out[n] = '\0';
+	return out;
+}
+
+char *ms_substr(const char *s, size_t start, size_t len)
+{
+	size_t slen;
+	if (!s)
+		return NULL;
+	slen = strlen(s);
+	if (start >= slen)
+		return ms_strdup("");
+	if (start + len > slen)
+		len = slen - start;
+	return ms_strndup(s + start, len);
+}
+
+char *ms_strjoin(const char *a, const char *b)
+{
+	size_t la;
+	size_t lb;
+	char *out;
+
+	if (!a || !b)
+		return NULL;
+	la = strlen(a);
+	lb = strlen(b);
+	out = (char *)malloc(la + lb + 1);
+	if (!out)
+		return NULL;
+	memcpy(out, a, la);
+	memcpy(out + la, b, lb);
+	out[la + lb] = '\0';
+	return out;
+}
+
+char *ms_strjoin3(const char *a, const char *b, const char *c)
+{
+	char *ab;
+	char *abc;
+
+	ab = ms_strjoin(a, b);
+	if (!ab)
+		return NULL;
+	abc = ms_strjoin(ab, c);
+	free(ab);
+	return abc;
+}
+
+char *ms_itoa(int n)
+{
+	char buf[32];
+	int i;
+	int neg;
+	long nb;
+
+	nb = n;
+	neg = (nb < 0);
+	if (neg)
+		nb = -nb;
+	i = 30;
+	buf[31] = '\0';
+	if (nb == 0)
+		buf[i--] = '0';
+	while (nb > 0)
+	{
+		buf[i--] = (char)('0' + (nb % 10));
+		nb /= 10;
+	}
+	if (neg)
+		buf[i--] = '-';
+	return ms_strdup(&buf[i + 1]);
+}

src/builtins/builtins.c

@@ -0,0 +1,34 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   builtins.c                                         :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: sede-san <sede-san@student.42madrid.com    +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2025/12/01 17:04:57 by sede-san          #+#    #+#             */
+/*   Updated: 2026/02/08 19:51:38 by sede-san         ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "builtins.h"
+
+u_int8_t	set_builtins(
+	t_minishell *minishell
+) {
+	minishell->builtins
+		= ft_hashmap_new(4, ft_hashmap_hashstr, ft_hashmap_strcmp);
+	if (minishell->builtins == NULL)
+		return (0);
+	ft_hashmap_put(minishell->builtins, ft_strdup("cd"), builtin_cd);
+	ft_hashmap_put(minishell->builtins, ft_strdup("echo"), builtin_echo);
+	ft_hashmap_put(minishell->builtins, ft_strdup("exit"), builtin_exit);
+	ft_hashmap_put(minishell->builtins, ft_strdup("pwd"), builtin_pwd);
+	return (1);
+}
+
+u_int8_t	is_builtin(
+	const char *command_name,
+	t_minishell *minishell
+) {
+	return (ft_hashmap_contains_key(minishell->builtins, command_name));
+}

src/builtins/cd/cd.c

@@ -6,7 +6,7 @@
 /*   By: sede-san <sede-san@student.42madrid.com    +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2025/10/31 00:05:22 by sede-san          #+#    #+#             */
-/*   Updated: 2025/10/31 01:38:14 by sede-san         ###   ########.fr       */
+/*   Updated: 2025/12/01 14:11:32 by sede-san         ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -26,7 +26,7 @@ u_int8_t	builtin_cd(
 		return (2);
 	}
 	else if (cmd.argc == 1)
-		path = getenv("HOME");
+		path = get_env("HOME", msh);
 	else
 		path = cmd.argv[1];
 	if (chdir(path) == -1)
@@ -41,6 +41,8 @@ static u_int8_t	handle_error(
 ){
 	u_int8_t	exit_code;
 
+	(void)msh;
+	exit_code = 0;
 	if (access(path, F_OK) != -1)
 		// No such file or directory
 		exit_code = 1;

src/builtins/echo/echo.c

@@ -6,7 +6,7 @@
 /*   By: sede-san <sede-san@student.42madrid.com    +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2025/10/31 02:41:11 by sede-san          #+#    #+#             */
-/*   Updated: 2025/11/02 03:12:00 by sede-san         ###   ########.fr       */
+/*   Updated: 2025/12/01 18:05:51 by sede-san         ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -14,11 +14,13 @@
 #include "echo_def.h"
 
 u_int8_t	builtin_echo(
-	t_command cmd
+	t_command cmd,
+	t_minishell *msh
 ){
 	const t_args	args = read_args(cmd);
 	size_t			i;
 
+	(void)msh;
 	i = -1;
 	while (args.strings.data.sp[++i])
 	{

src/builtins/exit/exit.c

@@ -6,28 +6,28 @@
 /*   By: sede-san <sede-san@student.42madrid.com    +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2025/10/30 01:20:48 by sede-san          #+#    #+#             */
-/*   Updated: 2025/10/30 09:08:02 by sede-san         ###   ########.fr       */
+/*   Updated: 2026/02/08 21:16:18 by sede-san         ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
 #include "builtins.h"
+#include <stdint.h>
 
-u_int8_t	builtin_exit(
+uint8_t	builtin_exit(
 	t_command cmd,
 	t_minishell *msh
-){
+)
+{
+	uint8_t	exit_status;
+	
 	ft_eputendl("exit");
 	if (cmd.argc == 1)
-	{
+		exit_status = msh->exit_status;
-		// msh.exit = 1;
-		// return the last exit_status, if none 0 is returned
-		return (msh->exit_status);
-	}
 	else if (!ft_strisnum(cmd.argv[1]))
 	{
-		ft_eputstr("exit: ");
+		ft_eprintf(
-		ft_eputendl(cmd.argv[1]);
+			"minishell: exit: %s: numeric argument required\n",
-		ft_eputendl(": numeric argument required");
+			cmd.argv[1]);
 		return (2);
 	}
 	else if (cmd.argc > 2)
@@ -36,9 +36,11 @@ u_int8_t	builtin_exit(
 		return (2);
 	}
 	else
-	{
+		exit_status = (uint8_t)ft_atol(cmd.argv[1]);
-		// msh.exit = 1;
+
-		// cast to u_int8_t causes to return a value between 0 and 255
+	printf("builtin_exit: exit_status=%d\n", exit_status); // Debug print
-		return ((u_int8_t)ft_atol(cmd.argv[1]));
+
-	}
+	msh->exit = 1;
+	msh->exit_status = exit_status;
+	return (exit_status);
 }

src/builtins/pwd/pwd.c

@@ -6,7 +6,7 @@
 /*   By: sede-san <sede-san@student.42madrid.com    +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2025/10/29 22:08:55 by sede-san          #+#    #+#             */
-/*   Updated: 2025/10/30 01:14:09 by sede-san         ###   ########.fr       */
+/*   Updated: 2025/12/01 16:27:08 by sede-san         ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -20,7 +20,7 @@ u_int8_t	builtin_pwd(
 
 	(void)cmd;
 	(void)msh;
-	getcwd(cwd, PATH_MAX);
+	if (getcwd(cwd, PATH_MAX) != NULL)
-	printf("%s\n", cwd);
+		ft_putendl(cwd);
 	return (EXIT_SUCCESS);
 }

src/core/command/command.c

@@ -0,0 +1,12 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   command.c                                          :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: sede-san <sede-san@student.42madrid.com    +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2026/02/09 18:40:03 by sede-san          #+#    #+#             */
+/*   Updated: 2026/02/09 18:40:04 by sede-san         ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+

src/executor/executor.c

@@ -5,119 +5,226 @@
 /*                                                    +:+ +:+         +:+     */
 /*   By: sede-san <sede-san@student.42madrid.com    +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
-/*   Created: 2025/10/28 13:03:44 by sede-san          #+#    #+#             */
+/*   Created: 2026/02/08 19:10:47 by sede-san          #+#    #+#             */
-/*   Updated: 2025/10/29 20:37:09 by sede-san         ###   ########.fr       */
+/*   Updated: 2026/02/08 21:32:03 by sede-san         ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
 #include "executor.h"
+#include "builtins.h"
 
-static char		*solve_path(char *cmd_name, t_minishell *msh);
+static inline uint8_t	execute_builtin(
-static u_int8_t	path_is_solved(char *cmd_name);
+	const t_command *command,
-static void		handle_child(t_command *cmd, t_minishell *msh);
+	t_minishell *minishell
-static void		handle_parent(pid_t child_pid, t_command *cmd, t_minishell *msh);
+)
-
-u_int8_t	execute(
-	t_command cmd,
-	t_minishell *msh
-){
-	pid_t	child_pid;
-
-	cmd.path = solve_path(cmd.argv[0], msh);
-	if (!cmd.path)
 {
-		// command not found
+	const t_builtin_func	builtin
-		ft_eprintf("minishell: %s: command not found\n", cmd.argv[0]);
+		= ft_hashmap_get(minishell->builtins, command->path);
-		return (msh->exit_status = 127, msh->exit_status);
+
+	return (builtin(*command, minishell));
 }
-	if (access(cmd.path, X_OK) != EXIT_SUCCESS)
+
+static void	handle_execve_error(
+	const t_command *command,
+	char **envp
+)
 {
-		// permission denied
+	free_envp(envp);
-		ft_eputstr("minishell: ");
+	perror(command->path);
-		perror(cmd.path);
+	exit(EXIT_FAILURE);
-		return (msh->exit_status = 126, msh->exit_status);
 }
-	child_pid = fork();
+
-	if (child_pid == -1)
+static void	execute_external_command(
-		perror("minishell");
+	const t_command *command,
-	else if (child_pid == 0)
+	t_minishell *minishell
-		handle_child(&cmd, msh);
+)
+{
+	char	**envp;
+
+	envp = get_envp(minishell);
+	if (envp == NULL)
+	{
+		perror("get_envp");
+		exit(EXIT_FAILURE);
+	}
+	execve(command->path, command->argv, envp);
+	handle_execve_error(command, envp);
+}
+
+static uint8_t	execute_command(
+	const t_command *command,
+	t_minishell *minishell
+)
+{
+	if (is_builtin(command->path, minishell))
+		return (execute_builtin(command, minishell));
 	else
-		handle_parent(child_pid, &cmd, msh);
+	{
-	return (msh->exit_status);
+		execute_external_command(command, minishell);
+		return (EXIT_FAILURE); //! should never reach here
+	}
 }
 
-static char	*solve_path(
+static void	cmdfree_argv(
-	char *cmd_name,
+	char **argv
-	t_minishell *msh
+)
-){
+{
-	char	*cmd_path;
-	char	**path;
 	size_t	i;
 
-	if (path_is_solved(cmd_name))
+	if (argv == NULL)
-		// return a copy to avoid double free on parent
+		return ;
-		return (ft_strdup(cmd_name));
+	i = 0;
-	//TODO substitute getenv call for own getenv
+	while (argv[i] != NULL)
-	path = ft_split(getenv("PATH"), COLON);
-	if (!path)
-		return (NULL);
-	(void)msh;
-	cmd_path = NULL;
-	i = -1;
-	while (!cmd_path && path[++i])
 	{
-		cmd_path = ft_strnjoin(3, path[i], "/", cmd_name);
+		free(argv[i]);
-		if (!cmd_path)
+		i++;
-			return (NULL);
-		/**
-		 * If a command exists but user has no execution permission
-		 * the command is shown as non existant instead of showing the
-		 * last ocurrence found
-		 *
-		 * TLDR:	bash shows 'Permission denied'
-		 * 			and minishell 'command not found'
-		 *
-		 * TEST:	execute an existing command without permission to do so
-		 */
-		if (access(cmd_path, X_OK) != EXIT_SUCCESS)
-			ft_free((void **)&cmd_path);
 	}
-	ft_free_split((char **)path);
+	free(argv);
-	if (!cmd_path)
-		return (NULL);
-	return (cmd_path);
 }
 
-static u_int8_t	path_is_solved(
+static void	cmdfree(
-	char *cmd_name
+	t_command *command
-){
+)
-	return (ft_strncmp(cmd_name, "/", 1) == 0
-		|| (cmd_name[1] && ft_strncmp(cmd_name, "./", 2) == 0)
-		|| (cmd_name[2] && ft_strncmp(cmd_name, "../", 3) == 0)
-	);
-}
-
-static void	handle_child(
-	t_command *cmd,
-	t_minishell *msh
-){
-	execve(cmd->path, cmd->argv, msh->variables.environment);
-}
-
-static void	handle_parent(
-	pid_t child_pid,
-	t_command *cmd,
-	t_minishell *msh
-){
-	if (waitpid(child_pid, (int *)&msh->exit_status, 0) == EXIT_SUCCESS)
 {
-		// handle success
+	if (command == NULL)
+		return ;
+	cmdfree_argv(command->argv);
+	free(command->path);
+	free(command);
+}
+
+static int	create_pipe_if_needed(
+	t_list *current_command,
+	t_pipeline *pipeline
+)
+{
+	if (!current_command->next)
+		return (0);
+	if (pipe(pipeline->pipefd) == PIPE_ERROR)
+		return (perror("pipe"), PIPE_ERROR);
+	return (0);
+}
+
+static bool	is_fork_required(
+	t_list *current_command,
+	t_minishell *minishell
+) {
+	const t_command	*command = current_command->content;
+
+	return (current_command->next != NULL
+		|| !is_builtin(command->path, minishell));
+}
+
+static pid_t	fork_process(
+	t_list *current_command,
+	t_minishell *minishell
+)
+{
+	pid_t			pid;
+
+	pid = 0;
+	if (is_fork_required(current_command, minishell))
+		pid = fork();
+	if (pid == FORK_ERROR)
+		perror("fork");
+	return (pid);
+}
+
+static void	setup_child_input(
+	t_pipeline *pipeline
+)
+{
+	if (pipeline->prev_read_fd != -1)
+	{
+		dup2(pipeline->prev_read_fd, STDIN_FILENO);
+		close(pipeline->prev_read_fd);
+	}
+}
+
+static void	setup_child_output(
+	t_list *current_command,
+	t_pipeline *pipeline
+)
+{
+	if (current_command->next)
+	{
+		dup2(pipeline->pipefd[WRITE_PIPE], STDOUT_FILENO);
+		close(pipeline->pipefd[READ_PIPE]);
+		close(pipeline->pipefd[WRITE_PIPE]);
+	}
+}
+
+static void	child_process(
+	t_list *current_command,
+	t_pipeline *pipeline,
+	t_minishell *minishell
+)
+{
+	uint8_t			exit_status;
+	const t_command	*command = current_command->content;
+
+	setup_child_input(pipeline);
+	setup_child_output(current_command, pipeline);
+	exit_status = execute_command(command, minishell);
+	if (is_fork_required(current_command, minishell))
+		exit(exit_status);
+}
+
+static void	parent_cleanup(
+	t_list *current_command,
+	t_pipeline *pipeline
+)
+{
+	if (pipeline->prev_read_fd != -1)
+		close(pipeline->prev_read_fd);
+	if (current_command->next)
+	{
+		close(pipeline->pipefd[WRITE_PIPE]);
+		pipeline->prev_read_fd = pipeline->pipefd[READ_PIPE];
 	}
 	else
+		pipeline->prev_read_fd = -1;
+}
+
+static uint8_t	wait_for_children(void)
 {
-		// handle error
+	uint8_t	exit_status;
+	int		status;
+
+	exit_status = EXIT_SUCCESS;
+	while (wait(&status) > 0)
+	{
+		if (WIFEXITED(status))
+			exit_status = WEXITSTATUS(status);
 	}
-	ft_free((void **)&cmd->path);
+	return (exit_status);
-	ft_free_split(cmd->argv);
+}
+
+uint8_t	execute(
+	t_list *command_list,
+	t_minishell *minishell
+)
+{
+	uint8_t		exit_status;
+	t_pipeline	pipeline;
+	t_list		*current_command;
+	pid_t		pid;
+
+	pipeline.prev_read_fd = -1;
+	current_command = command_list;
+	while (current_command)
+	{
+		if (create_pipe_if_needed(current_command, &pipeline) == PIPE_ERROR)
+			break ;
+		pid = fork_process(current_command, minishell);
+		if (pid == FORK_ERROR)
+			break ;
+		if (pid == 0)
+			child_process(current_command, &pipeline, minishell);
+		parent_cleanup(current_command, &pipeline);
+		current_command = current_command->next;
+	}
+	exit_status = wait_for_children();
+	ft_lstclear(&command_list, (void (*)(void *))cmdfree);
+	return (exit_status);
 }

src/main.c

@@ -3,14 +3,15 @@
 /*                                                        :::      ::::::::   */
 /*   main.c                                             :+:      :+:    :+:   */
 /*                                                    +:+ +:+         +:+     */
-/*   By: padan-pe <padan-pe@student.42.fr>          +#+  +:+       +#+        */
+/*   By: sede-san <sede-san@student.42madrid.com    +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2025/10/20 16:34:42 by sede-san          #+#    #+#             */
-/*   Updated: 2025/10/23 17:10:17 by padan-pe         ###   ########.fr       */
+/*   Updated: 2026/02/09 18:46:21 by sede-san         ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
 #include "minishell.h"
+#include "core.h"
 
 int	main(
 	int argc,
@@ -18,19 +19,14 @@ int	main(
 	char **envp
 ){
 	t_minishell	minishell;
-	u_int8_t	exit_status;
 
 	if (argc != 1 || argv[1] || !envp)
 	{
 		printf("Usage: ./minishell\n");
 		return (EXIT_FAILURE);
 	}
-	if (!minishell_init(&minishell, envp))
+	minishell_init(&minishell, envp);
-	{
+	minishell_run(&minishell);
-		printf("Error: %s\n", "failed to initialize minishell");
-		return (EXIT_FAILURE);
-	}
-	exit_status = minishell_run(&minishell);
 	minishell_clear(&minishell);
-	return (exit_status);
+	return (minishell.exit_status);
 }

src/minishell.c

@@ -6,45 +6,59 @@
 /*   By: sede-san <sede-san@student.42madrid.com    +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2025/10/20 20:51:33 by sede-san          #+#    #+#             */
-/*   Updated: 2025/10/30 22:36:03 by sede-san         ###   ########.fr       */
+/*   Updated: 2026/02/09 18:48:34 by sede-san         ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
 #include "minishell.h"
+#include "core.h"
+#include "parser.h"
+#include "executor.h"
 
-int	minishell_init(
+void	minishell_init(
 	t_minishell	*minishell,
 	char		**envp
 ){
 	ft_bzero(minishell, sizeof(t_minishell));
-	minishell->variables.environment = envp;
+	set_envp(envp, minishell);
-	return (1);
+	set_builtins(minishell);
+	if (minishell->variables.environment == NULL || minishell->builtins == NULL)
+		minishell_clear(minishell);
 }
 
-u_int8_t	minishell_run(
+void	minishell_run(
 	t_minishell	*minishell
 ){
 	char	*line;
-	t_command	command;
+	t_list	*commands;
 
-	line = NULL;
+	if (minishell == NULL)
+	{
+		minishell->exit_status = EXIT_FAILURE;
+		return ;
+	}
 	while (!minishell->exit)
 	{
-		line = readline("minishell > ");
+		line = readline(DEFAULT_PS1);
-		if (*line)
+		if (line != NULL)
+		{
+			if (*line != '\0')
 			{
 				add_history(line);
-			command = parse(line, minishell);
+				commands = parse(line, minishell);
-			execute(command, minishell);
+				execute(commands, minishell);
+			}
+			free(line);
 		}
-		ft_free((void **)&line);
 	}
-	return (minishell->exit_status);
 }
 
 void	minishell_clear(
 	t_minishell	*minishell
 ){
 	rl_clear_history();
-	ft_bzero(minishell, sizeof(t_minishell));
+	if (minishell->variables.environment != NULL)
+		ft_hashmap_clear(&minishell->variables.environment, free);
+	if (minishell->builtins != NULL)
+		ft_hashmap_clear_keys(&minishell->builtins);
 }

src/parser/lexer.c

@@ -0,0 +1,172 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   lexer.c                                            :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: sede-san <sede-san@student.42madrid.com    +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2026/02/09 18:56:41 by sede-san          #+#    #+#             */
+/*   Updated: 2026/02/10 09:11:23 by sede-san         ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "core.h"
+#include "parser.h"
+
+static t_token *tokenize(const char *line, size_t *start);
+static t_token_type get_token_type(const char *str);
+static t_token *token_new(t_token_type type, char *text);
+static void token_clear(t_token *token);
+static t_token *read_token(t_token_type type, const char *line, size_t *i);
+static t_token *read_word(const char *line, size_t *i);
+static inline bool is_meta(char c);
+
+/**
+ * @brief Converts a command line string into a list of tokens.
+ * 
+ * @return A list of tokens or NULL on error.
+ */
+t_list *lex(
+	const char *line)
+{
+	t_list *tokens;
+	t_token *token;
+	size_t i;
+
+	tokens = NULL;
+	i = 0;
+	while (line[i] != '\0')
+	{
+		while (ft_isspace(line[i]))
+			i++;
+		if (line[i] == '\0')
+			break;
+		token = tokenize(line, &i);
+		ft_lstadd_back(&tokens, ft_lstnew(token));
+		if (token == NULL)
+		{
+			ft_lstclear(&tokens, (void (*)(void *))token_clear);
+			return (NULL);
+		}
+	}
+	return (tokens);
+}
+
+/**
+ * @return A new token or NULL on error.
+ */
+static t_token *tokenize(
+	const char *line,
+	size_t *start)
+{
+	t_token *token;
+	t_token_type type;
+
+	if (line == NULL || line[*start] == '\0')
+		return (NULL);
+	type = get_token_type(line + *start);
+	if (type != TOKEN_WORD)
+		token = read_token(type, line, start);
+	else
+		token = read_word(line, start);
+	return (token);
+}
+
+static t_token_type get_token_type(
+	const char *str
+)
+{
+	if (str == NULL || str[0] == '\0')
+		return (TOKEN_WORD);
+	if (str[0] == '|')
+		return (TOKEN_PIPE);
+	if (str[0] == '<')
+	{
+		if (str[1] == '<')
+			return (TOKEN_HEREDOC);
+		return (TOKEN_REDIRECT_IN);
+	}
+	if (str[0] == '>')
+	{
+		if (str[1] == '>')
+			return (TOKEN_APPEND);
+		return (TOKEN_REDIRECT_OUT);
+	}
+	return (TOKEN_WORD);
+}
+
+static t_token *token_new(
+	t_token_type type,
+	char *text)
+{
+	t_token *token;
+
+	token = (t_token *)malloc(sizeof(t_token));
+	if (token == NULL)
+		return (NULL);
+	token->type = type;
+	token->value = text;
+	if (token->type == TOKEN_WORD && token->value == NULL)
+	{
+		free(token);
+		return (NULL);
+	}
+	return (token);
+}
+
+static void token_clear(
+	t_token *token)
+{
+	if (token != NULL)
+	{
+		free(token->value);
+		free(token);
+	}
+}
+
+static t_token *read_token(
+	t_token_type type,
+	const char *line,
+	size_t *i)
+{
+	const size_t	start = *i;
+	size_t 			end;
+
+	while (is_meta(line[*i]))
+		(*i)++;
+	end = *i;
+	while (ft_isspace(line[*i]))
+		(*i)++;
+	return (token_new(type, ft_substr(line, start, end - start)));
+}
+
+static t_token *read_word(
+	const char *line,
+	size_t *i)
+{
+	const size_t start = *i;
+	bool in_single_quote;
+	bool in_double_quote;
+
+	in_single_quote = false;
+	in_double_quote = false;
+	while (line[*i] != '\0')
+	{
+		char c = line[*i];
+		(void)c;
+		if (line[*i] == '\'' && !in_double_quote)
+			in_single_quote = !in_single_quote;
+		else if (line[*i] == '"' && !in_single_quote)
+			in_double_quote = !in_double_quote;
+		else if (!in_single_quote && !in_double_quote
+			&& (isspace(line[*i]) || is_meta(line[*i])))
+			break;
+		(*i)++;
+	}
+	return (token_new(TOKEN_WORD, ft_substr(line, start, *i - start)));
+}
+
+static inline bool is_meta(char c)
+{
+	return (c == '|' || c == '<' || c == '>');
+}

src/parser/parser.c

@@ -6,73 +6,295 @@
 /*   By: sede-san <sede-san@student.42madrid.com    +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2025/10/22 18:37:38 by sede-san          #+#    #+#             */
-/*   Updated: 2025/10/23 22:53:35 by sede-san         ###   ########.fr       */
+/*   Updated: 2026/02/09 18:50:43 by sede-san         ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
-#include "minishell.h"
+#include "parser.h"
 
-static char	**expand_envs(char **argv);
+// parse exclusive
-static int	count_argv(char **argv);
+static char			*extract_next_command(char *line, size_t *index);
+static char			*trim_whitespaces(char *line, size_t *start, size_t *end);
+// static void			set_pipes(t_list *commands);
 
-char	*parse(
+// common
+static void			find_boundary(char *line, size_t *index, char bound_char);
+
+// command exclusive
+static t_command	*cmdnew(char *line, t_minishell *minishell);
+static void			set_argv(t_command *command, char *line, t_minishell *minishell);
+static void			expand_envs(char *arg, t_minishell *minishell);
+static char			**lst_to_argv(t_list *argv_list);
+static void			set_argc(t_command *command);
+static void			set_infile(t_command *command);
+static void			set_outfile(t_command *command);
+static void			set_path(t_command *command, t_minishell *minishell);
+static u_int8_t		path_is_solved(char *cmd_name, t_minishell *msh);
+static char			*solve_path(char *command_name, t_minishell *minishell);
+
+t_list	*parse(
 	char *line,
 	t_minishell *minishell
 ) {
-	t_command	command;
+	t_list		*commands;
+	t_list		*tokens;
+	t_command	*command;
+	char		*command_str;
+	size_t		i;
 
-	if (!line || !*line)
+	if (line == NULL)
 		return (NULL);
-	(void)minishell;
+	commands = NULL;
-	command.argv = expand_envs(ft_split(line, SPACE));
+	i = 0;
-	command.argc = count_argv(command.argv);
+	while (line[i] != '\0')
-	if (!command.argc)
+	{
-		return (NULL);
+		tokens = tokenize();
-////////////////////////////////////////////////////////////////////////////////
+		command_str = extract_next_command(line, &i);
-	//* DEBUG
+		if (command_str != NULL)
-	// int	i = -1;
+		{
-	// while (command.argv[++i])
+			command = cmdnew(command_str, minishell);
-		// printf("argv[%i]: %s\n", i, command.argv[i]);
+			free(command_str);
-////////////////////////////////////////////////////////////////////////////////
+			if (command != NULL)
+				ft_lstadd_back(&commands, ft_lstnew(command));
+		}
+	}
+	// set_pipes(commands);
+	return (commands);
+}
+
+// static void	set_pipes(
+// 	t_list *commands
+// ) {
+// 	t_list		*current_command;
+// 	t_list		*previous_command;
+// 	t_list		*next_command;
+// 	t_command	*command;
+
+// 	previous_command = NULL;
+// 	current_command = commands;
+// 	while (current_command != NULL)
+// 	{
+// 		command = (t_command *)current_command->content;
+// 		if (previous_command != NULL)
+// 			command->piped_from = (t_command *)previous_command->content;
+// 		next_command = current_command->next;
+// 		if (next_command != NULL)
+// 			command->piped_to = (t_command *)next_command->content;
+// 		previous_command = current_command;
+// 		current_command = current_command->next;
+// 	}
+// }
+
+static char	*extract_next_command(
+	char *line,
+	size_t *index
+) {
+	char	*command_str;
+	size_t	start;
+	size_t	end;
+
+	start = *index;
+	find_boundary(line, index, '|');
+	end = *index;
+	command_str = trim_whitespaces(line, &start, &end);
+	while (line[*index] == '|' || ft_isspace(line[*index]))
+		(*index)++;
+	return (command_str);
+}
+
+static void	find_boundary(
+	char *line,
+	size_t *index,
+	char bound_char
+) {
+	bool	in_single_quote;
+	bool	in_double_quote;
+
+	in_single_quote = false;
+	in_double_quote = false;
+	while (line[*index] != '\0')
+	{
+		if (line[*index] == '\'' && !in_double_quote)
+			in_single_quote = !in_single_quote;
+		else if (line[*index] == '"' && !in_single_quote)
+			in_double_quote = !in_double_quote;
+		if (line[*index] == bound_char && !in_single_quote && !in_double_quote)
+			break ;
+		(*index)++;
+	}
+}
+
+static char	*trim_whitespaces(
+	char *line,
+	size_t *start,
+	size_t *end
+) {
+	while (*start < *end && ft_isspace(line[*start]))
+		(*start)++;
+	while (*end > *start && ft_isspace(line[*end - 1]))
+		(*end)--;
+	if (*end > *start)
+		return (ft_substr(line, *start, *end - *start));
 	return (NULL);
 }
 
-static char	**expand_envs(
+static t_command	*cmdnew(
-	char **argv
+	char *line,
+	t_minishell *minishell
 ) {
-	int		i;
+	t_command	*command;
-	char	*env;
 
+	command = (t_command *)ft_calloc(1, sizeof(t_command));
+	if (!command)
+		return (NULL);
+	// resolve_heredoc
+	set_argv(command, line, minishell);
+	if (!command->argv)
+	{
+		free(command);
+		return (NULL);
+	}
+	set_argc(command);
+	set_infile(command);
+	set_outfile(command);
+	set_path(command, minishell);
+	return (command);
+}
+
+static void	set_argv(
+	t_command *command,
+	char *line,
+	t_minishell *minishell
+) {
+	t_list	*argv_list;
+	char	*arg;
+	size_t	i;
+	size_t	start;
+	size_t	end;
+
+	if (line == NULL)
+		return ;
+	i = 0;
+	argv_list = NULL;
+	while (line[i] != '\0')
+	{
+		start = i;
+		find_boundary(line, &i, ' ');
+		end = i;
+		arg = trim_whitespaces(line, &start, &end);
+		expand_envs(arg, minishell);
+		if (arg != NULL)
+			ft_lstadd_back(&argv_list, ft_lstnew(arg));
+		while (ft_isspace(line[i]))
+			i++;
+	}
+	command->argv = lst_to_argv(argv_list);
+	ft_lstclear(&argv_list, free);
+}
+
+static void	expand_envs(
+	char *arg,
+	t_minishell *minishell
+) {
+	// TODO
+	(void)arg;
+	(void)minishell;
+}
+
+static char	**lst_to_argv(
+	t_list *argv_list
+) {
+	char	**argv;
+	t_list	*current_arg;
+	size_t	i;	
+
+	argv = (char **)ft_calloc(ft_lstsize(argv_list) + 1, sizeof(char *));
 	if (!argv)
 		return (NULL);
-	else if (!*argv) // check if ft_split returned and empty matrix
+	i = 0;
+	current_arg = argv_list;
+	while (current_arg != NULL)
 	{
-		ft_free_split(argv);
+		argv[i] = ft_strdup((char *)current_arg->content);
-		return (NULL);
+		i++;
-	}
+		current_arg = current_arg->next;
-	i = -1;
-	while (argv[++i])
-	{
-		if (!ft_strchr(argv[i], DOLLAR)
-			|| (ft_strchr(argv[i], DOLLAR) && ft_strchr(argv[i], SINGLE_QUOTE) && ft_strchr(argv[i] + (ft_strchr(argv[i], SINGLE_QUOTE) + 1 - argv[i]), SINGLE_QUOTE))) // env is surrounded by single quote
-			continue ;
-		env = getenv(ft_strchr(argv[i], DOLLAR) + 1);
-		free(argv[i]);
-		if (env)
-			argv[i] = ft_strdup(env);
-		else
-			argv[i] = ft_strdup("");
 	}
 	return (argv);
 }
 
-static int	count_argv(
+static void	set_argc(
-	char **argv
+	t_command *command
 ) {
-	int	i;
+	int	argc;
 
-	i = 0;
+	argc = 0;
-	while (argv[i])
+	while (command->argv[argc] != NULL)
-		i++;
+		argc++;
-	return (i);
+	command->argc = argc;
+}
+
+static void	set_infile(
+	t_command *command
+) {
+	// test_infile
+	command->infile = -1;
+}
+
+static void	set_outfile(
+	t_command *command
+) {
+	// test_outfile
+	command->outfile = STDOUT_FILENO;
+}
+
+static void	set_path(
+	t_command *command,
+	t_minishell *minishell
+) {
+	char	*command_path;
+	char	*command_name;
+
+	command_name = command->argv[0];
+	if (!path_is_solved(command_name, minishell))
+		command_path = solve_path(command_name, minishell);
+	else
+		command_path = ft_strdup(command_name);
+	command->path = command_path;
+}
+
+static char	*solve_path(
+	char *command_name,
+	t_minishell *minishell
+){
+	char	*command_path;
+	char	**path_env;
+	size_t	i;
+
+	path_env = ft_split(get_env("PATH", minishell), ':');
+	if (!path_env)
+		return (NULL);
+	command_path = NULL;
+	i = -1;
+	while (!command_path && path_env[++i])
+	{
+		command_path = ft_strnjoin(3, path_env[i], "/", command_name);
+		if (command_path != NULL && access(command_path, F_OK) != EXIT_SUCCESS)
+		{
+			free(command_path);
+			command_path = NULL;
+		}
+	}
+	ft_free_split(path_env);
+	return (command_path);
+}
+
+static u_int8_t	path_is_solved(
+	char *command_name,
+	t_minishell *minishell
+){
+	return (ft_strncmp(command_name, "/", 1) == 0
+		|| (command_name[1] && ft_strncmp(command_name, "./", 2) == 0)
+		|| (command_name[2] && ft_strncmp(command_name, "../", 3) == 0)
+		|| is_builtin(command_name, minishell)
+	);
 }

src/variables/environment.c

@@ -0,0 +1,179 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   environment.c                                      :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: sede-san <sede-san@student.42madrid.com    +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2025/12/01 09:12:39 by sede-san          #+#    #+#             */
+/*   Updated: 2026/02/08 19:44:15 by sede-san         ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "minishell.h"
+#include "core.h"
+
+/**
+ * @brief Parses and stores environment variables from envp array into a hashmap
+ *
+ * This function iterates through the environment variables array (envp) and
+ * splits each variable string on the '=' delimiter to separate the variable
+ * name from its value. Each name-value pair is then stored in the minishell's
+ * environment hashmap for later retrieval.
+ *
+ * @param envp Array of environment variable strings in "NAME=value" format
+ * @param msh  Pointer to the minishell structure containing the environment
+ *             hashmap
+ *
+ * @note The function assumes envp strings are in the standard format
+ *       "NAME=value"
+ */
+void	set_envp(
+	char **envp,
+	t_minishell *msh
+) {
+	char	**splitted_env;
+
+	msh->variables.environment
+		= ft_hashmap_new(32, ft_hashmap_hashstr, ft_hashmap_strcmp);
+	if (msh == NULL)
+	{
+		ft_hashmap_clear(&msh->variables.environment, free);
+		return ;
+	}
+	while (*envp != NULL)
+	{
+		splitted_env = ft_split(*envp, '=');
+		if (splitted_env == NULL)
+		{
+			ft_hashmap_clear(&msh->variables.environment, free);
+			return ;
+		}
+		ft_hashmap_put(msh->variables.environment,
+			ft_strdup(splitted_env[0]), ft_strdup(splitted_env[1]));
+		ft_free_split(splitted_env);
+		envp++;
+	}
+}
+
+/**
+ * @brief Sets an environment variable in the minishell's environment hashmap.
+ *
+ * This function adds a new environment variable or updates an existing one
+ * in the minishell's environment hashmap. If the variable already exists,
+ * the old value is freed to prevent memory leaks. If the variable is new,
+ * a duplicate of the key name is created for storage.
+ *
+ * @param env_name  The name of the environment variable to set
+ * @param env_value The value to assign to the environment variable
+ * @param msh       Pointer to the minishell structure containing the
+ *                  environment hashmap
+ */
+void	set_env(
+	const char *env_name,
+	char *env_value,
+	t_minishell *msh
+) {
+	t_hashmap	*environment;
+	const char	*key;
+	char		*old_value;
+
+	environment = msh->variables.environment;
+	key = env_name;
+	if (!ft_hashmap_contains_key(environment, key))
+		key = ft_strdup(env_name);
+	old_value = ft_hashmap_put(environment, key, ft_strdup(env_value));
+	if (old_value != NULL)
+		free(old_value);
+}
+
+/**
+ * @brief Converts the environment variables hashmap to an envp array format.
+ *
+ * This function extracts all environment variables from the minishell's
+ * environment hashmap and converts them into a NULL-terminated array of
+ * strings in the format "KEY=VALUE".
+ *
+ * @param msh Pointer to the minishell structure containing the environment
+ *            variables hashmap.
+ *
+ * @return A dynamically allocated array of strings representing environment
+ *         variables in "KEY=VALUE" format, terminated by NULL. Returns NULL
+ *         if memory allocation fails. The caller is responsible for freeing
+ *         the returned array and its individual string elements using
+ *         the `free_envp()` function.
+ *
+ * @note The function allocates memory for both the array and individual
+ *       strings using malloc and ft_strnjoin respectively.
+ * @note The returned array size is environment->size + 1 to accommodate
+ *       the NULL terminator.
+ */
+char	**get_envp(
+	t_minishell *msh
+) {
+	char		**envp;
+	t_list		*env_list;
+	t_list		*env;
+	t_map_entry	*entry;
+	size_t		i;
+
+	env_list = ft_hashmap_entries(msh->variables.environment);
+	envp = (char **)malloc((msh->variables.environment->size + 1) * sizeof(char *));
+	if (envp != NULL)
+	{
+		i = 0;
+		env = env_list;
+		while (env != NULL)
+		{
+			entry = env->content;
+			envp[i++] = ft_strnjoin(3, entry->key, "=", entry->value);
+			env = env->next;
+		}
+		envp[i] = NULL;
+	}
+	ft_lstclear_nodes(&env_list);
+	return (envp);
+}
+
+/**
+ * @brief Frees a dynamically allocated environment variables array
+ *
+ * This function deallocates memory for an array of strings that was previously
+ * allocated by `get_envp()`. It iterates through each string in the array,
+ * frees the memory for individual strings, and then frees the array itself.
+ *
+ * @param envp Pointer to the array of environment variable strings to be freed.
+ *             Each string in the array should be dynamically allocated.
+ *             The array must be NULL-terminated.
+ */
+void	free_envp(
+	char **envp
+) {
+	size_t	i;
+
+	i = -1;
+	while (envp[++i] != NULL)
+		free(envp[i]);
+	free(envp);
+}
+
+/**
+ * @brief Retrieves the value of an environment variable from the shell's
+ *        environment hashmap.
+ *
+ * This function searches for the specified environment variable name in the
+ * minishell's environment variable hashmap and returns its associated value.
+ *
+ * @param env_name The name of the environment variable to retrieve (e.g.,
+ *                 "PATH", "HOME")
+ * @param msh      Pointer to the minishell structure containing the environment
+ *                 variables hashmap
+ *
+ * @return The value of the environment variable if found, NULL if not found
+ */
+char	*get_env(
+	const char *env_name,
+	t_minishell *msh
+) {
+	return (ft_hashmap_get(msh->variables.environment, env_name));
+}