debug: special command can turn debug mode on and off

Using the .debug command, debug mode can be toggled. It starts turned off.

When it is on, each command, before being executed, is debug-printed using the
tree-printing facilities.

src/get_command.c

@@ -6,7 +6,7 @@
 /*   By: khais <marvin@42.fr>                       +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2025/02/19 18:03:11 by khais             #+#    #+#             */
-/*   Updated: 2025/02/19 18:04:06 by khais            ###   ########.fr       */
+/*   Updated: 2025/04/09 13:59:20 by khais            ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -18,6 +18,7 @@
 #include <stdlib.h>
 #include <unistd.h>
 #include "libft.h"
+#include "get_command.h"
 
 /*
 ** remove one '\n' from the end of the string, if it exists
@@ -34,13 +35,28 @@ static char	*strip_newline(char *str)
 	return (str);
 }
 
+static char	*handle_special_command(char *line, t_minishell *app)
+{
+	if (line == NULL)
+		return (NULL);
+	if (ft_strcmp(".debug", line) == 0)
+	{
+		app->debug = !app->debug;
+		ft_printf("[dbg: %d]\n", (int)app->debug);
+		line[0] = '\0';
+	}
+	return (line);
+}
+
 /*
 ** get a command line using readline.
 **
 ** returned buffer must be freed by caller.
 ** will add command to history if appropriate.
+**
+** Also handles special commands, which are not further processed.
 */
-char	*get_command(void)
+char	*get_command(t_minishell *app)
 {
 	char	*line;
 
@@ -50,5 +66,5 @@ char	*get_command(void)
 		line = strip_newline(get_next_line(STDIN_FILENO));
 	if (line != NULL && line[0] != '\0')
 		add_history(line);
-	return (line);
+	return (handle_special_command(line, app));
 }

src/get_command.h

@@ -6,13 +6,15 @@
 /*   By: khais <marvin@42.fr>                       +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2025/02/19 18:02:19 by khais             #+#    #+#             */
-/*   Updated: 2025/02/19 18:03:06 by khais            ###   ########.fr       */
+/*   Updated: 2025/04/09 13:51:41 by khais            ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
 #ifndef GET_COMMAND_H
 # define GET_COMMAND_H
 
-char	*get_command(void);
+# include "minishell.h"
+
+char	*get_command(t_minishell *app);
 
 #endif

src/minishell.c

@@ -6,7 +6,7 @@
 /*   By: khais <marvin@42.fr>                       +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2025/02/06 13:44:06 by kcolin            #+#    #+#             */
-/*   Updated: 2025/04/15 11:56:50 by khais            ###   ########.fr       */
+/*   Updated: 2025/04/15 14:36:03 by khais            ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -39,6 +39,17 @@ static void	execute_command(t_simple_cmd *cmd, t_minishell *app)
 	set_interactive_mode_sig_handling();
 }
 
+static void	debug_command(t_cmd *cmd, t_minishell *app)
+{
+	t_buffer	*indent;
+
+	if (app->debug == false)
+		return ;
+	indent = ft_buffer_new();
+	cmd_debug(cmd, indent, true);
+	ft_buffer_free(indent);
+}
+
 /*
 ** Do all the post-processing steps relating to a command.
 */
@@ -62,15 +73,6 @@ static void	app_init(t_minishell *app, char **envp)
 	app->env = env_from_envp(envp);
 }
 
-static void	debug_command(t_cmd *cmd)
-{
-	t_buffer	*indent;
-
-	indent = ft_buffer_new();
-	cmd_debug(cmd, indent, true);
-	ft_buffer_free(indent);
-}
-
 int	main(int argc, char *argv[], char **envp)
 {
 	char		*line;
@@ -81,9 +83,10 @@ int	main(int argc, char *argv[], char **envp)
 	(void)argv;
 	set_interactive_mode_sig_handling();
 	app_init(&app, envp);
+	app.debug = true;
 	line = "echo coucou";
 	cmd = minishell_parse(&app, line);
-	debug_command(cmd);
+	debug_command(cmd, &app);
 	cmd_destroy(cmd);
 	env_destroy(app.env);
 	return (0);

src/minishell.h

@@ -5,8 +5,8 @@
 /*                                                    +:+ +:+         +:+     */
 /*   By: khais <marvin@42.fr>                       +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
-/*   Created: 2025/04/14 15:00/22 by khais             #+#    #+#             */
-/*   Updated: 2025/04/14 15:00:22 by khais            ###   ########.fr       */
+/*   Created: 2025/04/09 13:49:28 by khais             #+#    #+#             */
+/*   Updated: 2025/04/15 12:01:54 by khais            ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -118,6 +118,7 @@ typedef struct s_minishell
 	t_env	*env;
 	int		lines_read;
 	int		last_return_value;
+	bool	debug;
 }	t_minishell;
 
 t_redirect	*t_redirect_add_back(t_redirect **init, t_redirect *back);