normed most of the line lib

line/src/line_history.c

@@ -0,0 +1,107 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   line_history.c                                     :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: maiboyer <maiboyer@student.42.fr>          +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2024/07/11 18:10:24 by maiboyer          #+#    #+#             */
+/*   Updated: 2024/07/11 18:17:26 by maiboyer         ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "line/_line_functions.h"
+#include "line/_line_internal.h"
+#include "me/gnl/gnl.h"
+#include "me/str/str.h"
+#include "me/string/string.h"
+#include "me/types.h"
+
+/* ================================ History ================================= */
+
+/* This is the API call to add a new entry in the linenoise history.
+ * It uses a fixed array of char pointers that are shifted (memmoved)
+ * when the history max length is reached in order to remove the older
+ * entry and make room for the new one, so it is not exactly suitable for huge
+ * histories, but will work well for a few hundred of entries.
+ *
+ * Using a circular buffer is smarter, but a bit more complex to handle. */
+bool	line_history_add(t_const_str line)
+{
+	t_str		linecopy;
+	t_vec_str	*history;
+
+	history = get_history();
+	if (history->len != 0 && \
+		str_compare(history->buffer[history->len - 1], line))
+		return (false);
+	linecopy = str_clone(line);
+	if (linecopy == NULL)
+		return (false);
+	vec_str_push(history, linecopy);
+	return (true);
+}
+
+/* Save the history in the specified file. On success 0 is returned
+ * otherwise -1 is returned. */
+t_error	line_history_save(t_str name)
+{
+	t_fd		*fd;
+	t_usize		j;
+	t_vec_str	*history;
+
+	history = get_history();
+	fd = open_fd(name, FD_READ, FD_CLOSE_ON_EXEC | FD_TRUNCATE | FD_CREATE, \
+		FP_OWRITE);
+	if (fd == NULL)
+		return (ERROR);
+	j = 0;
+	while (j < history->len)
+	{
+		write_fd(fd, (t_u8 *)history->buffer[j], str_len(history->buffer[j]),
+			NULL);
+		write_fd(fd, (t_u8 *)"\n", 1, NULL);
+		j++;
+	}
+	close_fd(fd);
+	return (NO_ERROR);
+}
+
+t_error	gnl_wrapper(t_fd *fd, t_string *out)
+{
+	bool		error;
+	t_string	value;
+
+	if (out == NULL || fd == NULL)
+		return (ERROR);
+	value = get_next_line(fd->fd, &error);
+	if (error)
+		return (ERROR);
+	return (*out = value, NO_ERROR);
+}
+
+/* Load the history from the specified file. If the file does not exist
+ * zero is returned and no operation is performed.
+ *
+ * If the file exists and the operation succeeded 0 is returned, otherwise
+ * on error -1 is returned. */
+t_error	line_history_load(t_str name)
+{
+	t_fd		*fd;
+	t_string	tmp;
+	t_vec_str	*history;
+
+	fd = open_fd(name, FD_READ, FD_CLOSE_ON_EXEC, FP_ALL_READ);
+	if (fd == NULL)
+		return (ERROR);
+	history = get_history();
+	while (!gnl_wrapper(fd, &tmp))
+	{
+		while (tmp.len != 0 && (tmp.buf[tmp.len - 1] == '\n' || \
+			tmp.buf[tmp.len - 1] == '\r'))
+			string_pop(&tmp);
+		vec_str_push(history, tmp.buf);
+	}
+	close_fd(fd);
+	return (NO_ERROR);
+}