From 97cca528658e5b811a56600b7c0b4f9c11bf83fc Mon Sep 17 00:00:00 2001
From: Dominik Kaiser <141638109+dpu-kaiser@users.noreply.github.com>
Date: Tue, 25 Jun 2024 14:02:02 +0200
Subject: [PATCH] Add basic command line

* Initialize terminal and signal handling
* Add basic repl that doesn't do anything yet
* Add handling for Ctrl-C, Ctrl-D and Ctrl-\ in interactive mode
---
 Makefile              |  4 ++--
 include/minishell.h   | 13 ++++++++++++-
 src/debug_tools.c     |  2 +-
 src/init.c            | 33 +++++++++++++++++++++++++++++++++
 src/main.c            |  6 ++++--
 src/repl.c            | 26 ++++++++++++++++++++++++++
 src/signal_handling.c | 38 ++++++++++++++++++++++++++++++++++++++
 7 files changed, 116 insertions(+), 6 deletions(-)
 create mode 100644 src/init.c
 create mode 100644 src/repl.c
 create mode 100644 src/signal_handling.c

diff --git a/Makefile b/Makefile
index 6fe15b6..dfe7a30 100644
--- a/Makefile
+++ b/Makefile
@@ -7,11 +7,11 @@ NAME    := minishell
 CC      =  cc
 CFLAGS  =  -Wall -Wextra -Werror
 LIB_DIR = lib
-LIBS    =  -L $(LIB_DIR)/libft -lft
+LIBS    =  -L $(LIB_DIR)/libft -lft -lreadline
 HEADERS =  -I include -I $(LIB_DIR)/libft
 
 VPATH   := src
-SRC     := main.c debug_tools.c
+SRC     := main.c debug_tools.c init.c signal_handling.c repl.c
 
 OBJ_DIR := _obj
 OBJ     := $(addprefix $(OBJ_DIR)/, $(SRC:%.c=%.o))
diff --git a/include/minishell.h b/include/minishell.h
index 9ebc58f..4f85144 100644
--- a/include/minishell.h
+++ b/include/minishell.h
@@ -6,7 +6,7 @@
 /*   By: dkaiser <dkaiser@student.42heilbronn.de    +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2024/06/22 17:14:49 by dkaiser           #+#    #+#             */
-/*   Updated: 2024/06/24 18:51:30 by dkaiser          ###   ########.fr       */
+/*   Updated: 2024/06/25 13:52:24 by dkaiser          ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -15,5 +15,16 @@
 
 # include "debug_tools.h"
 # include "libft.h"
+# include <stdio.h>
+# include <readline/readline.h>
+# include <signal.h>
+# include <stdlib.h>
+# include <termios.h>
+# include <unistd.h>
+
+int		init(void);
+int		init_signal_handling(void);
+
+void	repl(const char *prompt);
 
 #endif
diff --git a/src/debug_tools.c b/src/debug_tools.c
index e75c0a7..ccf2164 100644
--- a/src/debug_tools.c
+++ b/src/debug_tools.c
@@ -6,7 +6,7 @@
 /*   By: dkaiser <dkaiser@student.42heilbronn.de    +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2024/06/24 15:34:14 by dkaiser           #+#    #+#             */
-/*   Updated: 2024/06/25 12:48:20 by dkaiser          ###   ########.fr       */
+/*   Updated: 2024/06/25 13:13:18 by dkaiser          ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
diff --git a/src/init.c b/src/init.c
new file mode 100644
index 0000000..fd2c8ac
--- /dev/null
+++ b/src/init.c
@@ -0,0 +1,33 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   init.c                                             :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: dkaiser <dkaiser@student.42heilbronn.de    +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2024/06/24 15:02:24 by dkaiser           #+#    #+#             */
+/*   Updated: 2024/06/24 15:25:57 by dkaiser          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "minishell.h"
+
+static void	init_terminal(void);
+
+int	init(void)
+{
+	int	result;
+
+	init_terminal();
+	result = init_signal_handling();
+	return (result);
+}
+
+static void	init_terminal(void)
+{
+	struct termios	term;
+
+	tcgetattr(0, &term);
+	term.c_lflag &= ~ECHOCTL;
+	tcsetattr(0, TCSANOW, &term);
+}
diff --git a/src/main.c b/src/main.c
index 2699de3..016ede6 100644
--- a/src/main.c
+++ b/src/main.c
@@ -6,7 +6,7 @@
 /*   By: dkaiser <dkaiser@student.42heilbronn.de    +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2024/06/22 17:14:03 by dkaiser           #+#    #+#             */
-/*   Updated: 2024/06/22 17:14:36 by dkaiser          ###   ########.fr       */
+/*   Updated: 2024/06/25 13:58:24 by dkaiser          ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -14,5 +14,7 @@
 
 int	main(void)
 {
-	return (0);
+	if (init())
+		return (1);
+	repl("Minishell $ ");
 }
diff --git a/src/repl.c b/src/repl.c
new file mode 100644
index 0000000..f97af6c
--- /dev/null
+++ b/src/repl.c
@@ -0,0 +1,26 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   repl.c                                             :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: dkaiser <dkaiser@student.42heilbronn.de    +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2024/06/24 16:07:04 by dkaiser           #+#    #+#             */
+/*   Updated: 2024/06/25 13:50:19 by dkaiser          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "minishell.h"
+
+void	repl(const char *prompt)
+{
+	char	*input;
+
+	while (1)
+	{
+		input = readline(prompt);
+		if (input == NULL)
+			return ;
+		free(input);
+	}
+}
diff --git a/src/signal_handling.c b/src/signal_handling.c
new file mode 100644
index 0000000..a19fa94
--- /dev/null
+++ b/src/signal_handling.c
@@ -0,0 +1,38 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   signal_handling.c                                  :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: dkaiser <dkaiser@student.42heilbronn.de    +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2024/06/24 15:08:43 by dkaiser           #+#    #+#             */
+/*   Updated: 2024/06/25 13:33:26 by dkaiser          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "minishell.h"
+
+static void	handle_sigint(int status);
+static void	handle_sigquit(int status);
+
+int	init_signal_handling(void)
+{
+	if (signal(SIGINT, &handle_sigint) == SIG_ERR)
+		return (1);
+	if (signal(SIGQUIT, &handle_sigquit) == SIG_ERR)
+		return (1);
+	return (0);
+}
+
+static void	handle_sigint(__attribute__((unused)) int status)
+{
+	write(1, "\n", 1);
+	rl_replace_line("", 0);
+	rl_on_new_line();
+	rl_redisplay();
+}
+
+static void	handle_sigquit(__attribute__((unused)) int status)
+{
+	rl_redisplay();
+}
-- 
2.47.2