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/*
Load and show history of edited and viewed files
Copyright (C) 2020-2023
Free Software Foundation, Inc.
Written by:
Andrew Borodin <aborodin@vmail.ru>, 2019-2022
This file is part of the Midnight Commander.
The Midnight Commander 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.
The Midnight Commander 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 this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <config.h>
#include <stdio.h> /* file functions */
#include "lib/global.h"
#include "lib/fileloc.h" /* MC_FILEPOS_FILE */
#include "lib/mcconfig.h" /* mc_config_get_full_path() */
#include "lib/strutil.h" /* str_term_width1() */
#include "lib/util.h" /* backup functions */
#include "file_history.h"
/*** global variables ****************************************************************************/
/*** file scope macro definitions ****************************************************************/
#define TMP_SUFFIX ".tmp"
/*** file scope type declarations ****************************************************************/
typedef struct file_history_data_t
{
char *file_name;
char *file_pos;
} file_history_data_t;
/*** forward declarations (file scope functions) *************************************************/
/*** file scope variables ************************************************************************/
/* --------------------------------------------------------------------------------------------- */
/*** file scope functions ************************************************************************/
/* --------------------------------------------------------------------------------------------- */
static GList *
file_history_list_read (void)
{
char *fn;
FILE *f;
char buf[MC_MAXPATHLEN + 100];
GList *file_list = NULL;
/* open file with positions */
fn = mc_config_get_full_path (MC_FILEPOS_FILE);
if (fn == NULL)
return NULL;
f = fopen (fn, "r");
g_free (fn);
if (f == NULL)
return NULL;
while (fgets (buf, sizeof (buf), f) != NULL)
{
char *s;
file_history_data_t *fhd;
size_t len;
s = strrchr (buf, ' ');
/* FIXME: saved file position info is present in filepos file */
fhd = g_new (file_history_data_t, 1);
fhd->file_name = g_strndup (buf, s - buf);
len = strlen (s + 1);
fhd->file_pos = g_strndup (s + 1, len - 1); /* ignore '\n' */
file_list = g_list_prepend (file_list, fhd);
}
fclose (f);
return file_list;
}
/* --------------------------------------------------------------------------------------------- */
static void
file_history_list_write (const GList * file_list)
{
char *fn;
FILE *f;
gboolean write_error = FALSE;
fn = mc_config_get_full_path (MC_FILEPOS_FILE);
if (fn == NULL)
return;
mc_util_make_backup_if_possible (fn, TMP_SUFFIX);
f = fopen (fn, "w");
if (f != NULL)
{
GString *s;
s = g_string_sized_new (128);
for (; file_list != NULL && !write_error; file_list = g_list_next (file_list))
{
file_history_data_t *fhd = (file_history_data_t *) file_list->data;
g_string_append (s, fhd->file_name);
if (fhd->file_pos != NULL)
{
g_string_append_c (s, ' ');
g_string_append (s, fhd->file_pos);
}
write_error = (fprintf (f, "%s\n", s->str) < 0);
g_string_truncate (s, 0);
}
g_string_free (s, TRUE);
fclose (f);
}
if (write_error)
mc_util_restore_from_backup_if_possible (fn, TMP_SUFFIX);
else
mc_util_unlink_backup_if_possible (fn, TMP_SUFFIX);
g_free (fn);
}
/* --------------------------------------------------------------------------------------------- */
static void
file_history_create_item (history_descriptor_t * hd, void *data)
{
file_history_data_t *fhd = (file_history_data_t *) data;
size_t width;
width = str_term_width1 (fhd->file_name);
hd->max_width = MAX (width, hd->max_width);
listbox_add_item (hd->listbox, LISTBOX_APPEND_AT_END, 0, fhd->file_name, fhd->file_pos, TRUE);
/* fhd->file_pos is not copied, NULLize it to prevent double free */
fhd->file_pos = NULL;
}
/* --------------------------------------------------------------------------------------------- */
static void *
file_history_release_item (history_descriptor_t * hd, WLEntry * le)
{
file_history_data_t *fhd;
(void) hd;
fhd = g_new (file_history_data_t, 1);
fhd->file_name = le->text;
le->text = NULL;
fhd->file_pos = (char *) le->data;
le->data = NULL;
return fhd;
}
/* --------------------------------------------------------------------------------------------- */
static void
file_history_free_item (void *data)
{
file_history_data_t *fhd = (file_history_data_t *) data;
g_free (fhd->file_name);
g_free (fhd->file_pos);
g_free (fhd);
}
/* --------------------------------------------------------------------------------------------- */
/*** public functions ****************************************************************************/
/* --------------------------------------------------------------------------------------------- */
/**
* Show file history and return the selected file
*
* @param w widget used for positioning of history window
* @param action to do with file (edit, view, etc)
*
* @return name of selected file, A newly allocated string.
*/
char *
show_file_history (const Widget * w, int *action)
{
GList *file_list;
size_t len;
history_descriptor_t hd;
file_list = file_history_list_read ();
if (file_list == NULL)
return NULL;
len = g_list_length (file_list);
file_list = g_list_last (file_list);
history_descriptor_init (&hd, w->rect.y, w->rect.x, file_list, 0);
/* redefine list-specific functions */
hd.create = file_history_create_item;
hd.release = file_history_release_item;
hd.free = file_history_free_item;
history_show (&hd);
hd.list = g_list_first (hd.list);
/* Has history cleaned up or not? */
if (len != g_list_length (hd.list))
{
hd.list = g_list_reverse (hd.list);
file_history_list_write (hd.list);
}
g_list_free_full (hd.list, (GDestroyNotify) file_history_free_item);
*action = hd.action;
return hd.text;
}
/* --------------------------------------------------------------------------------------------- */
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