WIP: advance implementation bot not yet complete

Now we request a watch on the directory and we manage sending
and receiving directory change events.

The mechanism to update on the fly the directory scan is not complete.
The code to remove a file is there but we need to implement the code
to add a new file.

data/core/init.lua

@@ -283,6 +283,43 @@ function core.project_files_number()
 end
 
 
+local function file_search(files, filepath)
+  local inf, sup = 1, #files
+  if false then -- FIXME: skipping binary search / it is broken
+  while sup - inf > 8 do
+    local curr = math.floor((inf + sup) / 2)
+    if filepath < files[curr].filename then
+      sup = curr - 1
+    else
+      inf = curr
+    end
+  end
+  end
+  for i = inf, sup do
+    if files[i].filename == filepath then
+      return i
+    end
+  end
+end
+
+
+local function project_scan_remove_file(watch_id, filepath)
+  local project_dir_entry
+  for i = 1, #core.project_directories do
+    if core.project_directories[i].watch_id == watch_id then
+      project_dir_entry = core.project_directories[i]
+    end
+  end
+  print("LOOKING for", filepath, " in", project_dir_entry and project_dir_entry.name)
+  local index = project_dir_entry and file_search(project_dir_entry.files, filepath)
+  if index then
+    print("FOUND", filepath, " at index", index)
+    table.remove(files, index)
+    project_dir_entry.is_dirty = true
+  end
+end
+
+
 -- create a directory using mkdir but may need to create the parent
 -- directories as well.
 local function create_user_directory()
@@ -380,10 +417,13 @@ function core.add_project_directory(path)
   -- will be simply the name of the directory, without its path.
   -- The field item.topdir will identify it as a top level directory.
   path = normalize_path(path)
+  local watch_id = system.watch_dir(path);
   table.insert(core.project_directories, {
     name = path,
     item = {filename = common.basename(path), type = "dir", topdir = true},
-    files = {}
+    files = {},
+    is_dirty = true,
+    watch_id = watch_id,
   })
 end
 
@@ -890,6 +930,13 @@ function core.try(fn, ...)
 end
 
 
+function core.on_dir_change(watch_id, action, filepath)
+  if action == "delete" then
+    project_scan_remove_file(watch_id, filepath)
+  end
+end
+
+
 function core.on_event(type, ...)
   local did_keymap = false
   if type == "textinput" then
@@ -925,6 +972,9 @@ function core.on_event(type, ...)
     end
   elseif type == "focuslost" then
     core.root_view:on_focus_lost(...)
+  elseif type == "dirchange" then
+    print("DEBUG: dirchange", select(1, ...), select(2, ...), select(3, ...))
+    core.on_dir_change(...)
   elseif type == "quit" then
     core.quit()
   end

data/plugins/treeview.lua

@@ -108,11 +108,12 @@ function TreeView:check_cache()
     if not last_files then
       self.last[dir.name] = dir.files
     else
-      if dir.files ~= last_files then
+      if dir.is_dirty or dir.files ~= last_files then
         self:invalidate_cache(dir.name)
         self.last[dir.name] = dir.files
       end
     end
+    dir.is_dirty = false
   end
 end
 

src/api/system.c

@@ -6,7 +6,7 @@
 #include <errno.h>
 #include <sys/stat.h>
 #include "api.h"
-#include "dmon.h"
+#include "dirmonitor.h"
 #include "rencache.h"
 #ifdef _WIN32
   #include <direct.h>
@@ -223,6 +223,14 @@ top:
       lua_pushnumber(L, e.wheel.y);
       return 2;
 
+    case SDL_USEREVENT:
+      lua_pushstring(L, "dirchange");
+      lua_pushnumber(L, e.user.code >> 16);
+      lua_pushstring(L, (e.user.code & 0xffff) == DMON_ACTION_DELETE ? "delete" : "create");
+      lua_pushstring(L, e.user.data1);
+      free(e.user.data1);
+      return 4;
+
     default:
       goto top;
   }
@@ -639,33 +647,20 @@ static int f_set_window_opacity(lua_State *L) {
 }
 
 static void watch_callback(dmon_watch_id watch_id, dmon_action action, const char* rootdir,
-                           const char* filepath, const char* oldfilepath, void* user)
+  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);
+  (void)(user);
+  (void)(rootdir);
+  dirmonitor_push_event(watch_id, action, filepath, oldfilepath);
 }
 
 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;
+  fprintf(stderr, "DEBUG: watching dir: %s\n", path); fflush(stderr);
+  dmon_watch_id watch_id = dmon_watch(path, watch_callback, DMON_WATCHFLAGS_RECURSIVE, NULL);
+  lua_pushnumber(L, watch_id.id);
+  // FIXME: we ignore if there is an error.
+  return 1;
 }
 
 

src/main.c

@@ -18,12 +18,10 @@
   #include <mach-o/dyld.h>
 #endif
 
-#define DMON_IMPL
-#include "dmon.h"
+#include "dirmonitor.h"
 
 
 SDL_Window *window;
-Uint32 dmon_event_no;
 
 static double get_scale(void) {
 #ifdef _WIN32
@@ -136,12 +134,7 @@ 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);
-  }
+  dirmonitor_init();
 
   window = SDL_CreateWindow(
     "", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, dm.w * 0.8, dm.h * 0.8,
@@ -222,7 +215,7 @@ init_lua:
 
   lua_close(L);
   ren_free_window_resources();
-  dmon_deinit();
+  dirmonitor_deinit();
 
   return EXIT_SUCCESS;
 }

src/meson.build

@@ -6,6 +6,7 @@ lite_sources = [
     'api/regex.c',
     'api/system.c',
     'api/process.c',
+    'dirmonitor.c',
     'renderer.c',
     'renwindow.c',
     'fontdesc.c',