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-rw-r--r--src/file_history.c244
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diff --git a/src/file_history.c b/src/file_history.c
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+++ b/src/file_history.c
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+/*
+ Load and show history of edited and viewed files
+
+ Copyright (C) 2020-2022
+ 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;
+
+/*** 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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