fix: syntax error on pipe at start was not being detected

src/parser/parser.c

@@ -6,7 +6,7 @@
 /*   By: sede-san <sede-san@student.42madrid.com    +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2025/10/22 18:37:38 by sede-san          #+#    #+#             */
-/*   Updated: 2026/02/13 09:22:58 by sede-san         ###   ########.fr       */
+/*   Updated: 2026/02/13 13:30:21 by sede-san         ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -80,6 +80,8 @@ static t_list *parse_tokens(
 		return (NULL);
 	commands = NULL;
 	current_token = tokens;
+	if (((t_token *)current_token->content)->type == TOKEN_PIPE)
+		return (syntax_error_unexpected_token((t_token *)current_token->content), NULL);
 	while (current_token != NULL)
 	{
 		command = command_new(&current_token);
@@ -109,6 +111,22 @@ static t_list *parse_tokens(
 	return (commands);
 }
 
+static char	*replace_value(
+	char *original,
+	char *value,
+	int start,
+	int end
+)
+{
+	const char *before = ft_substr(original, 0, start);
+	const char *after = ft_substr(original, end, ft_strlen(original) - end);
+	const char *expanded = ft_strnjoin(3, before, value, after);
+
+	free((char *)before);
+	free((char *)after);
+	return ((char *)expanded);
+}
+
 static void expand_variable(
 	char **argument,
 	int *i,
@@ -131,10 +149,7 @@ static void expand_variable(
 	free(variable_name);
 	if (variable == NULL)
 		variable = "";
-	expanded = ft_strnjoin(3,
+	expanded = replace_value(*argument, variable, start - 1, end);
-		ft_substr(*argument, 0, *i),
-		variable,
-		ft_substr(*argument,end, ft_strlen(*argument) - end));
 	if (expanded == NULL)
 		return (minishell->exit = true, malloc_error());
 	*i += ft_strlen(variable) - 1;