minishell/src/minishell.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   minishell.c                                        :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: kcolin <marvin@42.fr>                      +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2025/02/06 13:44:06 by kcolin            #+#    #+#             */
/*   Updated: 2025/02/19 17:02:17 by khais            ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

// stdio must be included before readline
#include <stdio.h>
#include <readline/history.h>
#include <readline/readline.h>
#include <stdbool.h>
#include <stdlib.h>
#include <unistd.h>
#include "libft.h"

/*
** remove one '\n' from the end of the string, if it exists
*/
static char	*strip_newline(char *str)
{
	size_t	last_char_idx;

	if (str == NULL)
		return (NULL);
	last_char_idx = ft_strlen(str) - 1;
	if (str[last_char_idx] == '\n')
		str[last_char_idx] = '\0';
	return (str);
}

/*
** get a command line using readline.
**
** returned buffer must be freed by caller.
** will add command to history if appropriate.
*/
static char	*get_command(void)
{
	char	*line;

	if (isatty(STDIN_FILENO))
		line = readline("$ ");
	else
		line = strip_newline(get_next_line(STDIN_FILENO));
	if (line != NULL && line[0] != '\0')
		add_history(line);
	return (line);
}

int	main(int argc, char *argv[], char **envp)
{
	char	*line;

	(void)argc;
	(void)argv;
	(void)envp;
	line = get_command();
	while (line != NULL)
	{
		ft_printf("%s\n", line);
		free(line);
		line = get_command();
	}
	return (0);
}