From f1da67974f0da2a220b0fca4a75c9dd3305de964 Mon Sep 17 00:00:00 2001
From: Lukas Jiriste <ljiriste@student.42prague.com>
Date: Fri, 26 Apr 2024 14:03:25 +0200
Subject: [PATCH] Implement exitable skeleton of a shell

The minishell is now able to accept input and access history through
the GNU Readline library.
The minishell itself prints prompt with currect directory.
It also handles the "exit" command as well as ctrl-D
so that it can exit. It prints "exit" on exit like bash.
---
 Makefile   |  5 ++++-
 src/main.c | 62 ++++++++++++++++++++++++++++++++++++++++++++++++++++--
 2 files changed, 64 insertions(+), 3 deletions(-)

diff --git a/Makefile b/Makefile
index 7204d11..9166aa6 100644
--- a/Makefile
+++ b/Makefile
@@ -3,6 +3,9 @@ CFLAGS = -std=c99 -Wall -Wextra -Werror -Wpedantic
 
 RM := rm -f
 
+EXT_LIBS := readline
+LINKS := $(addprefix -l, $(EXT_LIBS))
+
 SUBPROJECTS := Libft
 
 INCDIR := inc
@@ -25,7 +28,7 @@ debug : CFLAGS += -g
 debug : $(NAME)
 
 $(NAME) : $(OBJECTS) Libft/libft.a
-	$(CC) $(CFLAGS) -o $@ $^
+	$(CC) $(CFLAGS) -o $@ $^ $(LINKS)
 
 Libft/libft.a : | Libft/Makefile
 ifneq (,$(findstring debug, $(MAKECMDGOALS)))
diff --git a/src/main.c b/src/main.c
index c4af877..59d0bf7 100644
--- a/src/main.c
+++ b/src/main.c
@@ -6,11 +6,69 @@
 /*   By: ljiriste <marvin@42.fr>                    +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2024/04/26 13:11:47 by ljiriste          #+#    #+#             */
-/*   Updated: 2024/04/26 13:12:09 by ljiriste         ###   ########.fr       */
+/*   Updated: 2024/04/26 14:13:15 by ljiriste         ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
+#include "libft.h"
+#include <stdlib.h>
+#include <unistd.h>				// getcwd
+#include <stdio.h>				// readline
+#include <readline/readline.h>	// readline
+#include <readline/history.h>	// readline
+
+// A string is "almost_empty" if it:
+//		is a NULL pointer
+//		is an empty string
+//		only contains whitespace
+int	almost_empty(const char *str)
+{
+	if (!str)
+		return (1);
+	while (*str)
+	{
+		if (!ft_isspace(*str))
+			return (0);
+		++str;
+	}
+	return (1);
+}
+
+char	*rl_get_line(void)
+{
+	char	*cwd;
+	char	*prompt;
+	char	*line;
+
+	cwd = getcwd(NULL, 0);
+	prompt = ft_strjoin(cwd, "$ ");
+	free(cwd);
+	line = readline(prompt);
+	free(prompt);
+	if (!almost_empty(line))
+		add_history(line);
+	return (line);
+}
+
+void	handle_input(__attribute__((unused)) const char *input)
+{
+	return ;
+}
+
 int main(void)
 {
-	return (0);
+	char	*line;
+
+	while (1)
+	{
+		line = rl_get_line();
+		if (!line || !ft_strcmp(line, "exit"))
+		{
+			rl_clear_history();
+			ft_printf("exit\n");
+			return (0);
+		}
+		handle_input(line);
+		free(line);
+	}
 }
-- 
2.30.2