pipeline parse: detect and reject pipe at start of command

src/parser/pipeline/pipeline_parse.c

@@ -6,7 +6,7 @@
 /*   By: khais <marvin@42.fr>                       +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2025/02/24 14:36:43 by khais             #+#    #+#             */
-/*   Updated: 2025/02/24 15:09:35 by khais            ###   ########.fr       */
+/*   Updated: 2025/02/24 15:21:37 by khais            ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -77,6 +77,8 @@ static void	pipeline_delimit(t_pipeline_builder *builder)
 **
 ** - Assumes that current word is unset.
 ** - Load the next word.
+** - If the current word is a pipe, it means there was a pipe on the start of
+**   the command, which is disalowed. set ft_errno and return NULL.
 ** - While there are still words remaining in the input stream
 **   - If we have a pipe character
 **     - Delimit the current command
@@ -94,6 +96,8 @@ static void	pipeline_delimit(t_pipeline_builder *builder)
 t_pipeline	*pipeline_parse_wordlist(t_pipeline_builder *builder)
 {
 	next_word(builder);
+	if (current_is_pipe(builder))
+		return (builder_destroy(builder), ft_errno(FT_EUNEXPECTED_PIPE), NULL);
 	while (!eof(builder))
 	{
 		if (current_is_pipe(builder))

tests/parse_pipelines.c

@@ -6,7 +6,7 @@
 /*   By: khais <marvin@42.fr>                       +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2025/02/21 13:13:58 by khais             #+#    #+#             */
-/*   Updated: 2025/02/21 16:03:39 by khais            ###   ########.fr       */
+/*   Updated: 2025/02/24 15:19:39 by khais            ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -110,6 +110,13 @@ static void	test_parse_pipeline_triple_pipe_rejected(void)
 	assert(ft_errno_get() == FT_EUNEXPECTED_PIPE);
 }
 
+static void	test_parse_pipeline_pipe_at_start_rejected(void)
+{
+	ft_errno(FT_ESUCCESS);
+	assert(parse_pipeline("| echo hello | tee output.txt") == NULL);
+	assert(ft_errno_get() == FT_EUNEXPECTED_PIPE);
+}
+
 int	main(void)
 {
 	test_parse_empty_pipeline();
@@ -119,5 +126,6 @@ int	main(void)
 	test_parse_pipeline_four_cmd();
 	test_parse_pipeline_double_pipe_rejected();
 	test_parse_pipeline_triple_pipe_rejected();
+	test_parse_pipeline_pipe_at_start_rejected();
 	return (0);
 }