From fa3cf20e068ba3db172898d22f70c97c0fdc4c44 Mon Sep 17 00:00:00 2001
From: TheBlueCrystal <github@mooncity.at>
Date: Tue, 15 Oct 2024 17:36:41 +0200
Subject: [PATCH 1/2] Implement ctime sorting

---
 src/filelist.c | 11 +++++++++++
 src/filelist.h |  2 ++
 src/options.c  |  2 ++
 3 files changed, 15 insertions(+)

diff --git a/src/filelist.c b/src/filelist.c
index a5ad8901..8720efa9 100644
--- a/src/filelist.c
+++ b/src/filelist.c
@@ -367,6 +367,7 @@ int feh_file_stat(feh_file * file)
 	}
 
 	file->mtime = st.st_mtime;
+	file->ctime = st.st_ctime;
 
 	file->size = st.st_size;
 
@@ -457,6 +458,13 @@ int feh_cmp_mtime(void *file1, void *file2)
 	return(FEH_FILE(file1)->mtime >= FEH_FILE(file2)->mtime ? -1 : 1);
 }
 
+/* Return -1 if file1 is _newer_ than file2 */
+int feh_cmp_ctime(void *file1, void *file2)
+{
+	/* gib_list_sort is not stable, so explicitly return 0 as -1 */
+	return(FEH_FILE(file1)->ctime >= FEH_FILE(file2)->ctime ? -1 : 1);
+}
+
 int feh_cmp_width(void *file1, void *file2)
 {
 	return((FEH_FILE(file1)->info->width - FEH_FILE(file2)->info->width));
@@ -527,6 +535,9 @@ void feh_prepare_filelist(void)
 	case SORT_DIRNAME:
 		filelist = gib_list_sort(filelist, feh_cmp_dirname);
 		break;
+	case SORT_CTIME:
+		filelist = gib_list_sort(filelist, feh_cmp_ctime);
+		break;
 	case SORT_MTIME:
 		filelist = gib_list_sort(filelist, feh_cmp_mtime);
 		break;
diff --git a/src/filelist.h b/src/filelist.h
index e6482625..ece8d132 100644
--- a/src/filelist.h
+++ b/src/filelist.h
@@ -37,6 +37,7 @@ struct __feh_file {
 
 	/* info stuff */
 	time_t mtime;
+	time_t ctime;
 	int size;
 	feh_file_info *info;	/* only set when needed */
 #ifdef HAVE_LIBEXIF
@@ -73,6 +74,7 @@ enum sort_type {
 	SORT_FILENAME,
 	SORT_DIRNAME,
 	SORT_SIZE, // everything after SORT_SIZE requires stat(2) information on the filelist
+	SORT_CTIME,
 	SORT_MTIME,
 	SORT_WIDTH, // everything after SORT_WIDTH requires preloading the images in the filelist
 	SORT_HEIGHT,
diff --git a/src/options.c b/src/options.c
index 3f405faa..96f47219 100644
--- a/src/options.c
+++ b/src/options.c
@@ -544,6 +544,8 @@ static void feh_parse_option_array(int argc, char **argv, int finalrun)
 				opt.sort = SORT_FILENAME;
 			else if (!strcasecmp(optarg, "dirname"))
 				opt.sort = SORT_DIRNAME;
+			else if (!strcasecmp(optarg, "ctime"))
+				opt.sort = SORT_CTIME;
 			else if (!strcasecmp(optarg, "mtime"))
 				opt.sort = SORT_MTIME;
 			else if (!strcasecmp(optarg, "width"))

From 8d1e644911a9e940d6516d659fbb3e0ecd739313 Mon Sep 17 00:00:00 2001
From: TheBlueCrystal <github@mooncity.at>
Date: Tue, 15 Oct 2024 21:48:58 +0200
Subject: [PATCH 2/2] Make ctime sorting also available in menu

---
 src/filelist.h | 1 +
 src/menu.c     | 8 ++++++++
 2 files changed, 9 insertions(+)

diff --git a/src/filelist.h b/src/filelist.h
index ece8d132..e5455a83 100644
--- a/src/filelist.h
+++ b/src/filelist.h
@@ -106,6 +106,7 @@ char *feh_http_unescape(char * url);
 int feh_cmp_name(void *file1, void *file2);
 int feh_cmp_dirname(void *file1, void *file2);
 int feh_cmp_filename(void *file1, void *file2);
+int feh_cmp_ctime(void *file1, void *file2);
 int feh_cmp_mtime(void *file1, void *file2);
 int feh_cmp_width(void *file1, void *file2);
 int feh_cmp_height(void *file1, void *file2);
diff --git a/src/menu.c b/src/menu.c
index 9c206928..6b7142a0 100644
--- a/src/menu.c
+++ b/src/menu.c
@@ -68,6 +68,7 @@ enum {
 	CB_SORT_FILENAME,
 	CB_SORT_IMAGENAME,
 	CB_SORT_DIRNAME,
+	CB_SORT_CTIME,
 	CB_SORT_MTIME,
 	CB_SORT_FILESIZE,
 	CB_SORT_RANDOMIZE,
@@ -952,6 +953,7 @@ void feh_menu_init_common(void)
 	feh_menu_add_entry(m, "By File Name", NULL, CB_SORT_FILENAME, 0, NULL);
 	feh_menu_add_entry(m, "By Image Name", NULL, CB_SORT_IMAGENAME, 0, NULL);
 	feh_menu_add_entry(m, "By Directory Name", NULL, CB_SORT_DIRNAME, 0, NULL);
+	feh_menu_add_entry(m, "By File Status Change Date", NULL, CB_SORT_CTIME, 0, NULL);
 	feh_menu_add_entry(m, "By Modification Date", NULL, CB_SORT_MTIME, 0, NULL);
 	if (opt.preload || (opt.sort > SORT_MTIME))
 		feh_menu_add_entry(m, "By File Size", NULL, CB_SORT_FILESIZE, 0, NULL);
@@ -1290,6 +1292,12 @@ void feh_menu_cb(feh_menu * m, feh_menu_item * i, int action, unsigned short dat
 				slideshow_change_image(m->fehwin, SLIDE_FIRST, 1);
 			}
 			break;
+		case CB_SORT_CTIME:
+			filelist = gib_list_sort(filelist, feh_cmp_ctime);
+			if (opt.jump_on_resort) {
+				slideshow_change_image(m->fehwin, SLIDE_FIRST, 1);
+			}
+			break;
 		case CB_SORT_MTIME:
 			filelist = gib_list_sort(filelist, feh_cmp_mtime);
 			if (opt.jump_on_resort) {