Add support for reloading files

Closes #8.

3 files changed, 87 insertions, 1 deletions

diff --git a/src/main.c b/src/main.c
index 92b7d40..e998c30 100644
--- a/src/main.c
+++ b/src/main.c
@@ -28,6 +28,7 @@ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 #include "navigator.h"
 #include "viewport.h"
 #include "util.h"
+#include "reload.h"
 
 struct {
   int fullscreen;
@@ -265,6 +266,9 @@ int main(int argc, char** argv)
   struct imv_viewport view;
   imv_init_viewport(&view, window);
 
+  struct imv_reload reload;
+  imv_init_reload(&reload);
+
   /* put us in fullscren mode to begin with if requested */
   if(g_options.fullscreen) {
     imv_viewport_toggle_fullscreen(&view);
@@ -396,7 +400,7 @@ int main(int argc, char** argv)
     }
 
     /* if the user has changed image, start loading the new one */
-    if(imv_navigator_poll_changed(&nav)) {
+    if(imv_navigator_poll_changed(&nav) || imv_reload_changed(&reload)) {
       const char *current_path = imv_navigator_selection(&nav);
       if(!current_path) {
         fprintf(stderr, "No input files left. Exiting.\n");
@@ -409,6 +413,7 @@ int main(int argc, char** argv)
       imv_viewport_set_title(&view, title);
 
       imv_loader_load_path(&ldr, current_path);
+      imv_reload_watch(&reload, current_path);
       view.playing = 1;
     }
 
@@ -547,6 +552,7 @@ int main(int argc, char** argv)
   imv_destroy_texture(&tex);
   imv_navigator_destroy(&nav);
   imv_destroy_viewport(&view);
+  imv_destroy_reload(&reload);
 
   if(font) {
     TTF_CloseFont(font);
diff --git a/src/reload.c b/src/reload.c
new file mode 100644
index 0000000..a307d45
--- /dev/null
+++ b/src/reload.c
@@ -0,0 +1,49 @@
+#include <sys/inotify.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <errno.h>
+
+#include "reload.h"
+
+void imv_init_reload(struct imv_reload *rld)
+{
+  rld->fd = inotify_init1(IN_NONBLOCK);
+  if(rld->fd == -1) {
+    perror("imv_init_reload");
+  }
+
+  rld->wd = 0;
+}
+
+void imv_reload_watch(struct imv_reload *rld, const char *path)
+{
+  if(rld->wd != 0) {
+    inotify_rm_watch(rld->fd, rld->wd);
+  }
+
+  rld->wd = inotify_add_watch(rld->fd, path, IN_CLOSE_WRITE);
+  if(rld->wd == -1) {
+    perror("imv_reload_watch");
+  }
+}
+
+int imv_reload_changed(struct imv_reload *rld)
+{
+  struct inotify_event ev;
+  ssize_t len = read(rld->fd, &ev, sizeof(ev));
+
+  if(len < 0) {
+    if(errno != EAGAIN) {
+      perror("imv_reload_changed");
+    }
+  } else if(ev.mask & IN_CLOSE_WRITE) {
+    return 1;
+  }
+
+  return 0;
+}
+
+void imv_destroy_reload(struct imv_reload *rld)
+{
+  close(rld->fd);
+}
diff --git a/src/reload.h b/src/reload.h
new file mode 100644
index 0000000..411647f
--- /dev/null
+++ b/src/reload.h
@@ -0,0 +1,31 @@
+#ifndef IMV_RELOAD_H
+#define IMV_RELOAD_H
+
+/* Copyright (c) 2015 Jose Diez 
+
+This program 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 2
+of the License, or (at your option) any later version.
+
+This program 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, write to the Free Software
+Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+*/
+
+struct imv_reload { 
+  int fd; // inotify file descriptor
+  int wd; // watch descriptor
+};
+
+void imv_init_reload(struct imv_reload *rld);
+void imv_reload_watch(struct imv_reload *rld, const char *path);
+int imv_reload_changed(struct imv_reload *rld);
+void imv_destroy_reload(struct imv_reload *rld);
+
+#endif