WIP: integrating dmon for directory monitoring

Just integrating the file, adding initialization and some
stub code.

licenses/licenses.md

@@ -22,6 +22,33 @@ LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
 
+## septag/dmon
+
+Copyright 2019 Sepehr Taghdisian. All rights reserved.
+
+https://github.com/septag/dmon
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+   1. Redistributions of source code must retain the above copyright notice,
+      this list of conditions and the following disclaimer.
+
+   2. Redistributions in binary form must reproduce the above copyright notice,
+      this list of conditions and the following disclaimer in the documentation
+      and/or other materials provided with the distribution.
+
+THIS SOFTWARE IS PROVIDED BY COPYRIGHT HOLDER "AS IS" AND ANY EXPRESS OR
+IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
+EVENT SHALL COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
+INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
 ## Fira Sans
 
 Digitized data copyright (c) 2012-2015, The Mozilla Foundation and Telefonica S.A.

src/api/system.c

@@ -6,6 +6,7 @@
 #include <errno.h>
 #include <sys/stat.h>
 #include "api.h"
+#include "dmon.h"
 #include "rencache.h"
 #ifdef _WIN32
   #include <direct.h>
@@ -637,6 +638,36 @@ static int f_set_window_opacity(lua_State *L) {
   return 1;
 }
 
+static void watch_callback(dmon_watch_id watch_id, dmon_action action, const char* rootdir,
+                           const char* filepath, const char* oldfilepath, void* user)
+{
+    (void)(user);
+    (void)(watch_id);
+
+    switch (action) {
+    case DMON_ACTION_CREATE:
+        printf("CREATE: [%s]%s\n", rootdir, filepath);
+        break;
+    case DMON_ACTION_DELETE:
+        printf("DELETE: [%s]%s\n", rootdir, filepath);
+        break;
+    case DMON_ACTION_MODIFY:
+        printf("MODIFY: [%s]%s\n", rootdir, filepath);
+        break;
+    case DMON_ACTION_MOVE:
+        printf("MOVE: [%s]%s -> [%s]%s\n", rootdir, oldfilepath, rootdir, filepath);
+        break;
+    }
+    fflush(stdout);
+}
+
+static int f_watch_dir(lua_State *L) {
+  const char *path = luaL_checkstring(L, 1);
+  dmon_watch(path, watch_callback, DMON_WATCHFLAGS_RECURSIVE, NULL);
+  // FIXME: we ignore the watch id and if there is an error.
+  return 0;
+}
+
 
 static const luaL_Reg lib[] = {
   { "poll_event",          f_poll_event          },
@@ -664,6 +695,7 @@ static const luaL_Reg lib[] = {
   { "exec",                f_exec                },
   { "fuzzy_match",         f_fuzzy_match         },
   { "set_window_opacity",  f_set_window_opacity  },
+  { "watch_dir",           f_watch_dir           },
   { NULL, NULL }
 };
 

src/main.c

@@ -18,8 +18,12 @@
   #include <mach-o/dyld.h>
 #endif
 
+#define DMON_IMPL
+#include "dmon.h"
+
 
 SDL_Window *window;
+Uint32 dmon_event_no;
 
 static double get_scale(void) {
 #ifdef _WIN32
@@ -132,6 +136,13 @@ int main(int argc, char **argv) {
   SDL_DisplayMode dm;
   SDL_GetCurrentDisplayMode(0, &dm);
 
+  dmon_init();
+  dmon_event_no = SDL_RegisterEvents(1);
+  if (dmon_event_no == (Uint32)-1) {
+    fprintf(stderr, "internal error registering SDL dmon event.\n");
+    exit(1);
+  }
+
   window = SDL_CreateWindow(
     "", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, dm.w * 0.8, dm.h * 0.8,
     SDL_WINDOW_RESIZABLE | SDL_WINDOW_ALLOW_HIGHDPI | SDL_WINDOW_HIDDEN);
@@ -211,6 +222,7 @@ init_lua:
 
   lua_close(L);
   ren_free_window_resources();
+  dmon_deinit();
 
   return EXIT_SUCCESS;
 }