Merge branch 'master' of https://github.com/swillner/feh into swillner-master

14 files changed, 166 insertions, 6 deletions

diff --git a/.travis.yml b/.travis.yml
index f59e68c..a12b97d 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -27,3 +27,4 @@ env:
   - stat64=1
   - verscmp=0
   - xinerama=0
+  - inotify=1
diff --git a/README.md b/README.md
index 390f9ca..2289b6b 100644
--- a/README.md
+++ b/README.md
@@ -89,6 +89,7 @@ indicates that the corresponding feature is enabled by default.
 | debug | 0 | debug build, enables `--debug` |
 | exif | 0 | Builtin EXIF tag display support |
 | help | 0 | include help text (refers to the manpage otherwise) |
+| inotify | 0 | enable inotify, needed for `--auto-reload` |
 | stat64 | 0 | Support CIFS shares from 64bit hosts on 32bit machines |
 | verscmp | 1 | Support naturing sorting (`--version-sort`). Requires a GNU-compatible libc exposing `strverscmp` |
 | xinerama | 1 | Support Xinerama/XRandR multiscreen setups |
diff --git a/config.mk b/config.mk
index 43cc394..fc9b5da 100644
--- a/config.mk
+++ b/config.mk
@@ -86,6 +86,13 @@ else
 	MAN_EXIF = disabled
 endif
 
+ifeq (${inotify},1)
+	CFLAGS += -DHAVE_INOTIFY
+	MAN_INOTIFY = enabled
+else
+	MAN_INOTIFY = disabled
+endif
+
 MAN_DATE ?= ${shell date '+%B %d, %Y'}
 
 # Uncomment this to use dmalloc
diff --git a/man/Makefile b/man/Makefile
index 9209de1..acf8629 100644
--- a/man/Makefile
+++ b/man/Makefile
@@ -12,6 +12,7 @@ all: ${TARGETS}
 	-e 's/\$$MAN_CURL\$$/${MAN_CURL}/' \
 	-e 's/\$$MAN_DEBUG\$$/${MAN_DEBUG}/' \
 	-e 's/\$$MAN_EXIF\$$/${MAN_EXIF}/' \
+	-e 's/\$$MAN_INOTIFY\$$/${MAN_INOTIFY}/' \
 	-e 's/\$$MAN_VERSCMP\$$/${MAN_VERSCMP}/' \
 	-e 's/\$$MAN_XINERAMA\$$/${MAN_XINERAMA}/' \
 	< ${@:.1=.pre} > $@
diff --git a/man/feh.pre b/man/feh.pre
index b1ef16a..f59301f 100644
--- a/man/feh.pre
+++ b/man/feh.pre
@@ -26,7 +26,8 @@ $VERSION$
 .
 Compile-time switches: libcurl support $MAN_CURL$, natural sorting support
 $MAN_VERSCMP$, Xinerama support
-$MAN_XINERAMA$, builtin EXIF support $MAN_EXIF$$MAN_DEBUG$
+$MAN_XINERAMA$, builtin EXIF support $MAN_EXIF$, inotify support
+$MAN_INOTIFY$$MAN_DEBUG$
 .
 .
 .Sh DESCRIPTION
diff --git a/src/feh.h b/src/feh.h
index 15da763..4d094a3 100644
--- a/src/feh.h
+++ b/src/feh.h
@@ -179,6 +179,9 @@ void feh_edit_inplace_lossless(winwidget w, int orientation);
 gib_list *feh_wrap_string(char *text, int wrap_width, Imlib_Font fn, gib_style * style);
 char *build_caption_filename(feh_file * file, short create_dir);
 gib_list *feh_list_jump(gib_list * root, gib_list * l, int direction, int num);
+#ifdef HAVE_INOTIFY
+void feh_event_handle_inotify(void);
+#endif
 
 /* Imlib stuff */
 extern Display *disp;
diff --git a/src/filelist.c b/src/filelist.c
index 6f4f6df..e3ae020 100644
--- a/src/filelist.c
+++ b/src/filelist.c
@@ -76,7 +76,7 @@ void feh_file_free(feh_file * file)
 #ifdef HAVE_LIBEXIF
 	if (file->ed)
 		exif_data_unref(file->ed);
-#endif		
+#endif
 	free(file);
 	return;
 }
diff --git a/src/help.raw b/src/help.raw
index ca7c85c..7a9a658 100644
--- a/src/help.raw
+++ b/src/help.raw
@@ -99,6 +99,7 @@ OPTIONS
      --max-dimension WxH   Only show images with width <= W and height <= H
      --scroll-step COUNT   scroll COUNT pixels when movement key is pressed
      --cache-size NUM      imlib cache size in mebibytes (0 .. 2048)
+     --auto-reload         automatically reload shown image if file was changed
 
 MONTAGE MODE OPTIONS
  -X, --ignore-aspect       Set thumbnail to specified width/height without
diff --git a/src/main.c b/src/main.c
index 87cf7c4..58a18cf 100644
--- a/src/main.c
+++ b/src/main.c
@@ -34,6 +34,10 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #include "wallpaper.h"
 #include <termios.h>
 
+#ifdef HAVE_INOTIFY
+#include <sys/inotify.h>
+#endif
+
 char **cmdargv = NULL;
 int cmdargc = 0;
 char *mode = NULL;
@@ -53,6 +57,15 @@ int main(int argc, char **argv)
 		init_x_and_imlib();
 		init_keyevents();
 		init_buttonbindings();
+#ifdef HAVE_INOTIFY
+        if (opt.auto_reload) {
+            opt.inotify_fd = inotify_init();
+            if (opt.inotify_fd < 0) {
+                opt.auto_reload = 0;
+                eprintf("inotify_init failed");
+            }
+        }
+#endif
 	}
 
 	feh_event_init();
@@ -146,6 +159,13 @@ int feh_main_iteration(int block)
 	FD_SET(xfd, &fdset);
 	if (control_via_stdin)
 		FD_SET(STDIN_FILENO, &fdset);
+#ifdef HAVE_INOTIFY
+    if (opt.auto_reload) {
+        FD_SET(opt.inotify_fd, &fdset);
+        if (opt.inotify_fd >= fdsize)
+            fdsize = opt.inotify_fd + 1;
+    }
+#endif
 
 	/* Timers */
 	ft = first_timer;
@@ -191,6 +211,10 @@ int feh_main_iteration(int block)
 			}
 			else if ((count > 0) && (FD_ISSET(0, &fdset)))
 				feh_event_handle_stdin();
+#ifdef HAVE_INOTIFY
+			else if (count && (FD_ISSET(opt.inotify_fd, &fdset)))
+                feh_event_handle_inotify();
+#endif
 		}
 	} else {
 		/* Don't block if there are events in the queue. That's a bit rude ;-) */
@@ -204,6 +228,10 @@ int feh_main_iteration(int block)
 				eprintf("Connection to X display lost");
 			else if ((count > 0) && (FD_ISSET(0, &fdset)))
 				feh_event_handle_stdin();
+#ifdef HAVE_INOTIFY
+			else if (count && (FD_ISSET(opt.inotify_fd, &fdset)))
+                feh_event_handle_inotify();
+#endif
 		}
 	}
 	if (window_num == 0 || sig_exit != 0)
@@ -218,6 +246,12 @@ void feh_clean_exit(void)
 
 	free(opt.menu_font);
 
+#ifdef HAVE_INOTIFY
+    if (opt.auto_reload)
+        if (close(opt.inotify_fd))
+            eprintf("inotify close failed");
+#endif
+
 	if(disp)
 		XCloseDisplay(disp);
 
diff --git a/src/options.c b/src/options.c
index 37fad88..2a5aae8 100644
--- a/src/options.c
+++ b/src/options.c
@@ -25,7 +25,6 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
 
 #include <strings.h>
-
 #include "feh.h"
 #include "filelist.h"
 #include "options.h"
@@ -425,6 +424,9 @@ static void feh_parse_option_array(int argc, char **argv, int finalrun)
 		{"conversion-timeout" , 1, 0, 245},
 		{"version-sort"  , 0, 0, 246},
 		{"offset"        , 1, 0, 247},
+#ifdef HAVE_INOTIFY
+		{"auto-reload"   , 0, 0, 248},
+#endif
 		{0, 0, 0, 0}
 	};
 	int optch = 0, cmdx = 0;
@@ -810,6 +812,11 @@ static void feh_parse_option_array(int argc, char **argv, int finalrun)
 			opt.offset_flags = XParseGeometry(optarg, &opt.offset_x,
 					&opt.offset_y, (unsigned int *)&discard, (unsigned int *)&discard);
 			break;
+#ifdef HAVE_INOTIFY
+		case 248:
+			opt.auto_reload = 1;
+			break;
+#endif
 		default:
 			break;
 		}
@@ -897,6 +904,10 @@ static void show_version(void)
 		"exif "
 #endif
 
+#ifdef HAVE_INOTIFY
+		"inotify "
+#endif
+
 #ifdef INCLUDE_HELP
 		"help "
 #endif
diff --git a/src/options.h b/src/options.h
index 7f8fe9c..883c8e2 100644
--- a/src/options.h
+++ b/src/options.h
@@ -58,6 +58,10 @@ struct __fehoptions {
 	unsigned char draw_exif;
 	unsigned char auto_rotate;
 #endif
+#ifdef HAVE_INOTIFY
+	unsigned char auto_reload;
+    int inotify_fd;
+#endif
 	unsigned char list;
 	unsigned char quiet;
 	unsigned char preload;
diff --git a/src/thumbnail.c b/src/thumbnail.c
index 45fbabe..5197618 100644
--- a/src/thumbnail.c
+++ b/src/thumbnail.c
@@ -93,7 +93,6 @@ void init_thumbnail_mode(void)
 
 	if (!opt.thumb_title)
 		opt.thumb_title = "%n";
-
 	mode = "thumbnail";
 
 	if (opt.font)
@@ -177,6 +176,7 @@ void init_thumbnail_mode(void)
 				td.h + title_area_h, 0, 0, 0, 255);
 	}
 
+
 	if (opt.display) {
 		winwid = winwidget_create_from_image(td.im_main, WIN_TYPE_THUMBNAIL);
 		winwidget_rename(winwid, PACKAGE " [thumbnail mode]");
@@ -418,6 +418,7 @@ void init_thumbnail_mode(void)
 		}
 	}
 
+
 	return;
 }
 
@@ -783,7 +784,6 @@ void feh_thumbnail_show_fullsize(feh_file *thumbfile)
 	if (!l) {
 		eprintf("Cannot find %s in filelist, wtf", thumbfile->filename);
 	}
-
 	thumbwin = winwidget_get_first_window_of_type(WIN_TYPE_THUMBNAIL_VIEWER);
 	if (!thumbwin) {
 		thumbwin = winwidget_create_from_file(
@@ -793,7 +793,13 @@ void feh_thumbnail_show_fullsize(feh_file *thumbfile)
 			winwidget_show(thumbwin);
 	} else if (FEH_FILE(thumbwin->file->data) != thumbfile) {
 		thumbwin->file = l;
+#ifdef HAVE_INOTIFY
+        winwidget_inotify_remove(thumbwin);
+#endif
 		feh_reload_image(thumbwin, 1, 1);
+#ifdef HAVE_INOTIFY
+        winwidget_inotify_add(thumbwin, thumbfile);
+#endif
 	}
 }
 
diff --git a/src/winwidget.c b/src/winwidget.c
index bb4fdae..020ee5b 100644
--- a/src/winwidget.c
+++ b/src/winwidget.c
@@ -30,6 +30,10 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #include "options.h"
 #include "events.h"
 
+#ifdef HAVE_INOTIFY
+#include <sys/inotify.h>
+#endif
+
 static void winwidget_unregister(winwidget win);
 static void winwidget_register(winwidget win);
 static winwidget winwidget_allocate(void);
@@ -78,6 +82,10 @@ static winwidget winwidget_allocate(void)
 	ret->click_offset_y = 0;
 	ret->has_rotated = 0;
 
+#ifdef HAVE_INOTIFY
+    ret->inotify_wd = -1;
+#endif
+
 	return(ret);
 }
 
@@ -662,6 +670,9 @@ void winwidget_destroy_xwin(winwidget winwid)
 
 void winwidget_destroy(winwidget winwid)
 {
+#ifdef HAVE_INOTIFY
+    winwidget_inotify_remove(winwid);
+#endif
 	winwidget_destroy_xwin(winwid);
 	if (winwid->name)
 		free(winwid->name);
@@ -673,6 +684,67 @@ void winwidget_destroy(winwidget winwid)
 	return;
 }
 
+#ifdef HAVE_INOTIFY
+void winwidget_inotify_remove(winwidget winwid)
+{
+    if (winwid->inotify_wd >= 0) {
+        D(("Removing inotify watch\n"));
+        if (inotify_rm_watch(opt.inotify_fd, winwid->inotify_wd))
+            eprintf("inotify_rm_watch failed");
+        winwid->inotify_wd = -1;
+    }
+}
+#endif
+
+#ifdef HAVE_INOTIFY
+void winwidget_inotify_add(winwidget winwid, feh_file * file)
+{
+    if (opt.auto_reload) {
+        D(("Adding inotify watch for %s\n", file->filename));
+        char dir[PATH_MAX];
+        feh_file_dirname(dir, file, PATH_MAX);
+        winwid->inotify_wd = inotify_add_watch(opt.inotify_fd, dir, IN_CLOSE_WRITE | IN_MOVED_TO);
+        if (winwid->inotify_wd < 0)
+            eprintf("inotify_add_watch failed");
+    }
+}
+#endif
+
+#ifdef HAVE_INOTIFY
+#define INOTIFY_BUFFER_LEN (1024 * (sizeof (struct inotify_event)) + 16)
+void feh_event_handle_inotify(void)
+{
+    D(("Received inotify events\n"));
+    char buf[INOTIFY_BUFFER_LEN];
+    int i = 0;
+    int len = read (opt.inotify_fd, buf, INOTIFY_BUFFER_LEN);
+    if (len < 0) {
+        if (errno != EINTR)
+            eprintf("inotify event read failed");
+    } else if (!len)
+        eprintf("inotify event read failed");
+    while (i < len) {
+        struct inotify_event *event;
+        event = (struct inotify_event *) &buf[i];
+        for (int j = 0; j < window_num; j++) {
+            if(windows[j]->inotify_wd == event->wd) {
+                if (event->mask & IN_IGNORED) {
+                    D(("inotify watch was implicitely removed\n"));
+                    windows[j]->inotify_wd = -1;
+                } else if (event->mask & (IN_CLOSE_WRITE | IN_MOVED_TO)) {
+                    if (strcmp(event->name, FEH_FILE(windows[j]->file->data)->name) == 0) {
+                        D(("inotify says file changed\n"));
+                        feh_reload_image(windows[j], 0, 1);
+                    }
+                }
+                break;
+            }
+        }
+        i += sizeof(struct inotify_event) + event->len;
+    }
+}
+#endif
+
 void winwidget_destroy_all(void)
 {
 	int i;
@@ -706,7 +778,16 @@ winwidget winwidget_get_first_window_of_type(unsigned int type)
 int winwidget_loadimage(winwidget winwid, feh_file * file)
 {
 	D(("filename %s\n", file->filename));
-	return(feh_load_image(&(winwid->im), file));
+#ifdef HAVE_INOTIFY
+    winwidget_inotify_remove(winwid);
+#endif
+    int res = feh_load_image(&(winwid->im), file);
+#ifdef HAVE_INOTIFY
+    if (res) {
+        winwidget_inotify_add(winwid, file);
+    }
+#endif
+	return(res);
 }
 
 void winwidget_show(winwidget winwid)
diff --git a/src/winwidget.h b/src/winwidget.h
index 0a707ac..4d8fc4b 100644
--- a/src/winwidget.h
+++ b/src/winwidget.h
@@ -116,8 +116,17 @@ struct __winwidget {
 	time_t click_start_time;
 
 	unsigned char has_rotated;
+
+#ifdef HAVE_INOTIFY
+	int inotify_wd;
+#endif
 };
 
+#ifdef HAVE_INOTIFY
+void winwidget_inotify_remove(winwidget winwid);
+void winwidget_inotify_add(winwidget winwid, feh_file * file);
+#endif
+
 int winwidget_loadimage(winwidget winwid, feh_file * filename);
 void winwidget_show(winwidget winwid);
 void winwidget_show_menu(winwidget winwid);