[Bugfix] open_plugin_browse() not showing plugins

rockbox_browse() overrides the desired dirfilter with
global_settings.dirfilter if you aren't using one of the
SHOW_ modes > NUM_FILTER_MODES (which come with their own sideeffects)

add flag BROWSE_DIRFILTER to
override global_settings.dirfilter with browse_context.dirfilter

add ability to set tc->browse to NULL to exit dirbrowse immediately

Change-Id: I2f40d394f9dc0864b2041293eda219f7436a7bf0

3 files changed, 24 insertions, 5 deletions

diff --git a/apps/open_plugin.c b/apps/open_plugin.c
index c36a72f30e..46b6007ee2 100644
--- a/apps/open_plugin.c
+++ b/apps/open_plugin.c
@@ -344,8 +344,25 @@ retnhash:
     return hash;
 }
 
+/* only displays directories and .rock files */
+static bool callback_show_item(char *name, int attr, struct tree_context *tc)
+{
+    (void)name;
+    if(attr & ATTR_DIRECTORY)
+    {
+        if (strstr(tc->currdir, PLUGIN_DIR) != NULL)
+            return true;
+        tc->browse = NULL; /* exit immediately */
+    }
+    else if(attr & FILE_ATTR_ROCK)
+    {
+        return true;
+    }
+    return false;
+}
+
 /* open_plugin_browse()
-* allows fthe user to browse for a plugin to set to a supplied key
+* allows the user to browse for a plugin to set to a supplied key
 * if key is a lang_id that is used otherwise a hash of the key is created
 * for later recall of the plugin path
 */
@@ -361,17 +378,18 @@ void open_plugin_browse(const char *key)
         (key ? P2STR((unsigned char *)key):"No Key"), open_plugin_entry.name);
     logf("OP browse %s %s", op_entry->path, op_entry->param);
 
-    if (op_entry->path[0] == '\0')
+    if (op_entry->path[0] == '\0' || !file_exists(op_entry->path))
         strcpy(op_entry->path, PLUGIN_DIR"/");
 
     struct browse_context browse = {
         .dirfilter = SHOW_ALL,
-        .flags = BROWSE_SELECTONLY,
+        .flags = BROWSE_SELECTONLY | BROWSE_NO_CONTEXT_MENU | BROWSE_DIRFILTER,
         .title = str(LANG_OPEN_PLUGIN),
         .icon = Icon_Plugin,
         .root = op_entry->path,
         .buf = tmp_buf,
         .bufsize = sizeof(tmp_buf),
+        .callback_show_item = callback_show_item,
     };
 
     if (rockbox_browse(&browse) == GO_TO_PREVIOUS)
diff --git a/apps/tree.c b/apps/tree.c
index 5dd88c8e9d..b9b257e093 100644
--- a/apps/tree.c
+++ b/apps/tree.c
@@ -652,7 +652,7 @@ static int dirbrowse(void)
         return GO_TO_PREVIOUS;  /* No files found for rockbox_browse() */
     }
 
-    while(1) {
+    while(tc.browse) {
         bool restore = false;
         if (tc.dirlevel < 0)
             tc.dirlevel = 0; /* shouldnt be needed.. this code needs work! */
@@ -1018,7 +1018,7 @@ int rockbox_browse(struct browse_context *browse)
     }
     else
     {
-        if (dirfilter != SHOW_ID3DB)
+        if (dirfilter != SHOW_ID3DB && (browse->flags & BROWSE_DIRFILTER) == 0)
             tc.dirfilter = &global_settings.dirfilter;
         tc.browse = browse;
         strmemccpy(current, browse->root, MAX_PATH);
diff --git a/apps/tree.h b/apps/tree.h
index 77da18d666..d454c0f7ee 100644
--- a/apps/tree.h
+++ b/apps/tree.h
@@ -38,6 +38,7 @@ struct entry {
 #define BROWSE_SELECTONLY       0x0001  /* exit on selecting a file */
 #define BROWSE_NO_CONTEXT_MENU  0x0002  /* disable context menu */
 #define BROWSE_RUNFILE          0x0004  /* do ft_open() on the file instead of browsing */
+#define BROWSE_DIRFILTER        0x0080  /* override global_settings.dirfilter with browse_context.dirfilter */
 #define BROWSE_SELECTED         0x0100  /* this bit is set if user selected item */