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/*
* history.c
*
* Copyright (C) 2012, 2013 James Booth <boothj5@gmail.com>
*
* This file is part of Profanity.
*
* Profanity is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Profanity is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Profanity. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include <stdlib.h>
#include <string.h>
#include <glib.h>
#include "history.h"
struct history_session_t {
GList *items;
GList *sess_curr;
GList *sess_new;
GList *orig_curr;
};
struct history_t {
GList *items;
guint max_size;
struct history_session_t session;
};
static void _replace_history_with_session(History history);
static gboolean _adding_new(History history);
static void _reset_session(History history);
static gboolean _has_session(History history);
static void _remove_first(History history);
static void _update_current_session_item(History history, char *item);
static void _add_to_history(History history, char *item);
static void _remove_last_session_item(History history);
static void _replace_current_with_original(History history);
static void _create_session(History history);
static void _session_previous(History history);
static void _session_next(History history);
History
history_new(unsigned int size)
{
History new_history = malloc(sizeof(struct history_t));
new_history->items = NULL;
new_history->max_size = size;
_reset_session(new_history);
return new_history;
}
void
history_append(History history, char *item)
{
char *copied = "";
if (item != NULL) {
copied = strdup(item);
}
if (history->items == NULL) {
_add_to_history(history, copied);
return;
}
if (!_has_session(history)) {
if (g_list_length(history->items) == history->max_size) {
_remove_first(history);
}
_add_to_history(history, copied);
} else {
_update_current_session_item(history, copied);
if (_adding_new(history)) {
if (strcmp(history->session.sess_curr->data, "") == 0) {
_remove_last_session_item(history);
}
_replace_history_with_session(history);
} else {
_remove_last_session_item(history);
char *new = strdup(history->session.sess_curr->data);
history->session.items = g_list_append(history->session.items, new);
_replace_current_with_original(history);
_replace_history_with_session(history);
}
}
}
char *
history_previous(History history, char *item)
{
// no history
if (history->items == NULL) {
return NULL;
}
char *copied = "";
if (item != NULL) {
copied = strdup(item);
}
if (!_has_session(history)) {
_create_session(history);
// add the new item
history->session.items = g_list_append(history->session.items, copied);
history->session.sess_new = g_list_last(history->session.items);
char *result = strdup(history->session.sess_curr->data);
return result;
} else {
_update_current_session_item(history, copied);
_session_previous(history);
}
char *result = strdup(history->session.sess_curr->data);
return result;
}
char *
history_next(History history, char *item)
{
// no history, or no session, return NULL
if ((history->items == NULL) || (history->session.items == NULL)) {
return NULL;
}
char *copied = "";
if (item != NULL) {
copied = strdup(item);
}
_update_current_session_item(history, copied);
_session_next(history);
char *result = strdup(history->session.sess_curr->data);
return result;
}
static void
_replace_history_with_session(History history)
{
g_list_free(history->items);
history->items = g_list_copy(history->session.items);
if (g_list_length(history->items) > history->max_size) {
_remove_first(history);
}
_reset_session(history);
}
static gboolean
_adding_new(History history)
{
return (history->session.sess_curr ==
g_list_last(history->session.items));
}
static void
_reset_session(History history)
{
history->session.items = NULL;
history->session.sess_curr = NULL;
history->session.sess_new = NULL;
history->session.orig_curr = NULL;
}
static gboolean
_has_session(History history)
{
return (history->session.items != NULL);
}
static void
_remove_first(History history)
{
GList *first = g_list_first(history->items);
char *first_item = first->data;
history->items = g_list_remove(history->items, first_item);
}
static void
_update_current_session_item(History history, char *item)
{
history->session.sess_curr->data = item;
}
static void
_add_to_history(History history, char *item)
{
history->items = g_list_append(history->items, item);
}
static void
_remove_last_session_item(History history)
{
history->session.items = g_list_reverse(history->session.items);
GList *first = g_list_first(history->session.items);
history->session.items =
g_list_remove(history->session.items, first->data);
history->session.items = g_list_reverse(history->session.items);
}
static void
_replace_current_with_original(History history)
{
history->session.sess_curr->data = strdup(history->session.orig_curr->data);
}
static void
_create_session(History history)
{
history->session.items = g_list_copy(history->items);
history->session.sess_curr = g_list_last(history->session.items);
history->session.orig_curr = g_list_last(history->items);
}
static void
_session_previous(History history)
{
history->session.sess_curr =
g_list_previous(history->session.sess_curr);
if (history->session.orig_curr == NULL)
history->session.orig_curr = g_list_last(history->items);
else
history->session.orig_curr =
g_list_previous(history->session.orig_curr);
if (history->session.sess_curr == NULL) {
history->session.sess_curr = g_list_first(history->session.items);
history->session.orig_curr = g_list_first(history->items);
}
}
static void
_session_next(History history)
{
history->session.sess_curr = g_list_next(history->session.sess_curr);
history->session.orig_curr = g_list_next(history->session.orig_curr);
if (history->session.sess_curr == NULL) {
history->session.sess_curr = g_list_last(history->session.items);
history->session.orig_curr = NULL;
}
}
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