plugins: random folder advance: misc improvements

fixes:
- traverse_dir was called recursively using two
  MAX_PATH local buffers => possible stack overflow
- The import function inserted additional, incorrect,
  entries when the whole line buffer was filled
- "Dirs not found" message overlapped number
  of folders when generating folder list
- Final number of scanned folders wasn't displayed
- Wouldn't stop inserting when maximum number
  of files in playlist was already reached
- Prevent buffer overflow when importing
- Don't write to fd after opening failed
- Use whole buffer with read_line, instead
  of subtracting 1. Remove hard coded sizes
- CRs don't need to be removed in import function
  (already handled by read_line)

features:
- Use insert context for *much* faster insertion
  of large # of folders, and nicer progress display
- Use UI viewport
- Add progress indicator when saving or loading
- Display number of folders in edit list title
- Go back to plugin's main menu from edit list
- Only ask to save changes if list is dirty
- Warn before erasing modified playlist
- Flag successfully created playlist as modified
- Make folder scan wait for dircache
- Shorten menu item names
- Put "Play Shuffled" menu item first
- Remember selection when returning from submenus
- Go to WPS after ACTION_TREE_WPS
- Exit menu when pressing Back
- Perform an initial scan, if no data file exists
  yet, when "Play Shuffled" or "Edit" is selected

Change-Id: I7df76f8fb8387888ce491d8b74b01b481e9997d3

apps/onplay.c

@@ -296,7 +296,7 @@ static void op_playlist_insert_selected(int position, bool queue)
         }
 
         playlist_insert_directory(NULL, selected_file.path, position, queue,
-                                  recurse == RECURSE_ON);
+                                  recurse == RECURSE_ON, NULL);
     }
 }
 

apps/playlist.c

@@ -2221,7 +2221,7 @@ int playlist_directory_tracksearch(const char* dirname, bool recurse,
         /* user abort */
         if (action_userabort(TIMEOUT_NOBLOCK))
         {
-            result = -1;
+            result = -2;
             break;
         }
 
@@ -2507,22 +2507,29 @@ void playlist_insert_context_release(struct playlist_insert_context *context)
  */
 int playlist_insert_directory(struct playlist_info* playlist,
                               const char *dirname, int position, bool queue,
-                              bool recurse)
+                              bool recurse, struct playlist_insert_context* context)
 {
-    int result = -1;
-    struct playlist_insert_context context;
-    result = playlist_insert_context_create(playlist, &context,
-                                            position, queue, true);
+    bool context_provided = context;
+    int result = 0;
+    struct playlist_insert_context c;
+
+    if (!context_provided)
+    {
+        context = &c;
+        result = playlist_insert_context_create(playlist, &c,
+                                                position, queue, true);
+    }
     if (result >= 0)
     {
         cpu_boost(true);
 
         result = playlist_directory_tracksearch(dirname, recurse,
-            directory_search_callback, &context);
+            directory_search_callback, context);
 
         cpu_boost(false);
     }
-    playlist_insert_context_release(&context);
+    if (!context_provided)
+        playlist_insert_context_release(&c);
     return result;
 }
 

apps/playlist.h

@@ -157,7 +157,7 @@ int playlist_insert_context_add(struct playlist_insert_context *context,
 void playlist_insert_context_release(struct playlist_insert_context *context);
 int playlist_insert_directory(struct playlist_info* playlist,
                               const char *dirname, int position, bool queue,
-                              bool recurse);
+                              bool recurse, struct playlist_insert_context *context);
 int playlist_insert_playlist(struct playlist_info* playlist, const char *filename,
                              int position, bool queue);
 bool playlist_entries_iterate(const char *filename,

apps/plugin.c

@@ -357,7 +357,10 @@ static const struct plugin_api rockbox_api = {
     simplelist_show_list,
     yesno_pop,
     yesno_pop_confirm,
+
+    /* status bar */
     sb_set_title_text,
+    sb_set_persistent_title,
 
     /* action handling */
     get_custom_action,
@@ -738,6 +741,8 @@ static const struct plugin_api rockbox_api = {
     playlist_insert_track,
     playlist_insert_directory,
     playlist_insert_playlist,
+    playlist_insert_context_create,
+    playlist_insert_context_release,
     playlist_shuffle,
     warn_on_pl_erase,
     audio_play,
@@ -874,7 +879,6 @@ static const struct plugin_api rockbox_api = {
 
     /* new stuff at the end, sort into place next time
        the API gets incompatible */
-    sb_set_persistent_title,
 };
 
 static int plugin_buffer_handle;

apps/plugin.h

@@ -178,7 +178,7 @@ int plugin_open(const char *plugin, const char *parameter);
  * when this happens please take the opportunity to sort in
  * any new functions "waiting" at the end of the list.
  */
-#define PLUGIN_API_VERSION 276
+#define PLUGIN_API_VERSION 277
 
 /* 239 Marks the removal of ARCHOS HWCODEC and CHARCELL */
 
@@ -419,7 +419,11 @@ struct plugin_api {
     bool (*simplelist_show_list)(struct simplelist_info *info);
     bool (*yesno_pop)(const char* text);
     bool (*yesno_pop_confirm)(const char* text);
+
+    /* status bar */
     bool (*sb_set_title_text)(const char* title, enum themable_icons icon, enum screen_type screen);
+    bool (*sb_set_persistent_title)(const char* title, enum themable_icons icon,
+                                    enum screen_type screen);
 
     /* action handling */
     int (*get_custom_action)(int context,int timeout,
@@ -863,9 +867,13 @@ struct plugin_api {
             const char *filename, int position, bool queue, bool sync);
     int (*playlist_insert_directory)(struct playlist_info* playlist,
                               const char *dirname, int position, bool queue,
-                              bool recurse);
+                              bool recurse, struct playlist_insert_context *context);
     int (*playlist_insert_playlist)(struct playlist_info* playlist,
                                     const char *filename, int position, bool queue);
+    int (*playlist_insert_context_create)(struct playlist_info* playlist,
+                                          struct playlist_insert_context *context,
+                                          int position, bool queue, bool progress);
+    void (*playlist_insert_context_release)(struct playlist_insert_context *context);
     int (*playlist_shuffle)(int random_seed, int start_index);
     bool (*warn_on_pl_erase)(void);
     void (*audio_play)(unsigned long elapsed, unsigned long offset);
@@ -1026,8 +1034,6 @@ struct plugin_api {
 
     /* new stuff at the end, sort into place next time
        the API gets incompatible */
-    bool (*sb_set_persistent_title)(const char* title, enum themable_icons icon,
-                                    enum screen_type screen);
 };
 
 /* plugin header */

apps/plugins/lua/rocklib.c

@@ -392,7 +392,7 @@ RB_WRAP(playlist)
             pos = luaL_optint(L, 3, PLAYLIST_INSERT);
             queue = lua_toboolean(L, 4); /* default to false */
             recurse = lua_toboolean(L, 5); /* default to false */
-            result = rb->playlist_insert_directory(NULL, dir, pos, queue, recurse);
+            result = rb->playlist_insert_directory(NULL, dir, pos, queue, recurse, NULL);
             break;
         case PLAYL_INSERTPLAYL:
             filename = luaL_checkstring(L, 2); /* only required parameter */

docs/PLUGIN_API

@@ -1874,13 +1874,14 @@ int playlist_get_track_info(struct playlist_info* playlist, int index, struct pl
     \return
     \description
 
-int playlist_insert_directory(struct playlist_info* playlist, const char *dirname, int position, bool queue, bool recurse)
+int playlist_insert_directory(struct playlist_info* playlist, const char *dirname, int position, bool queue, bool recurse, struct playlist_insert_context *context)
     \group playback control
     \param playlist
     \param dirname
     \param position
     \param queue
     \param recurse
+    \param context
     \return
     \description
 

manual/plugins/random_folder_advance_config.tex

@@ -5,7 +5,8 @@ when the Auto-Change Directory feature is set to \setting{Random}.
 
 \subsubsection{Menu}
 \begin{description}
-\item[Generate Folder List] Generates a list of all folders found 
+\item[Play Shuffled] Starts playback with the selected directories in random order. Tracks within a directory will be played in normal order. The plugin will exit after starting playback.
+\item[Scan Folders] Generates a list of all folders found 
 on the player.  You can filter the directories which are scanned by
 creating a file called \\* 
 \fname{/.rockbox/folder\_advance\_dir.txt}.  
@@ -16,12 +17,11 @@ Only the directories in this file and any contained directories
  directory to be ignored.).  If you just want \fname{/CDs}
  to be ignored but want to include the folders within 
 it you need to have both \fname{-/CDs} and \fname{CDs} as entries.
-\item[Edit Folder List] Enter the folder list editor
-\item[Export List To Textfile] Exports the list to 
+\item[Edit] Enter the folder list editor
+\item[Export to Text File] Exports the list to 
   \fname{/.rockbox/folder\_advance\_list.txt}
-\item[Import List From Textfile] Imports the list from
+\item[Import from Text File] Imports the list from
   \fname{/.rockbox/folder\_advance\_list.txt}
-\item[Play Shuffled] Starts playback with the selected directories in random order. Tracks within a directory will be played in normal order. The plugin will exit after starting playback.
 \item[Quit]
 \end{description}