[Feature] Skin engine Themes grab text from a file %ft(file, line)

allow the skin engine to read text files and return a particular line

you then can use ss on that string to allow display of strings from the file
(Playername comes to mind)

able to be used as conditional
%?ft(filename)<Found|Not Found>

if (selected) line of file is empty the tag is treated as #COMMENT

bugfix:
%t(n)%?x<text|text>
would ignore the specified timeout defaulting to 2 seconds

bugfix: cabbiev2.128x160x16.wps was missing %Sx()
for translation on 'Next Track:'

playername.txt generated at boot if it doesn't exist contents: 'Rockbox!'

Change-Id: I04ea4fd411f74c7c6e672657949aa520c2f86f95

apps/gui/skin_engine/skin_parser.c

@@ -1316,6 +1316,71 @@ static int parse_progressbar_tag(struct skin_element* element,
     return 0;
 }
 
+static int parse_filetext(struct skin_element *element,
+                            struct wps_token *token,
+                            struct wps_data *wps_data)
+{
+    (void)wps_data;
+    const char* filename;
+    char buf[MAX_PATH];
+    int fd;
+    int line = 0;
+
+    /* format: %ft(filename[,line]) */
+    filename = get_param_text(element, 0);
+
+    if (element->params_count == 2)
+        line = get_param(element, 1)->data.number;
+    else if (element->params_count != 1)
+    {
+        DEBUGF("%s(file, line): %s Error: param count %d\n",
+                  __func__, filename, element->params_count);
+        return WPS_ERROR_INVALID_PARAM;
+    }
+    path_append(buf, ROCKBOX_DIR, filename, sizeof(buf));
+    DEBUGF("%s %s[%d]\n", __func__, buf, line);
+
+    if ((fd = open_utf8(buf, O_RDONLY)) < 0)
+    {
+        DEBUGF("%s: Error Opening %s\n", __func__, buf);
+        goto failure;
+    }
+
+    int rd = 0;
+    while (line >= 0)
+    {
+        if ((rd = read_line(fd, buf, sizeof(buf))) < 0)
+            break;
+        line--;
+    }
+
+    if (rd <= 0) /* empty line? */
+    {
+        DEBUGF("%s: Error(%d) Reading %s\n", __func__, rd, filename);
+        goto failure;
+    }
+
+    buf[rd] = '\0';
+    char * skinbuf = skin_buffer_alloc(rd+1);
+
+    if (!skinbuf)
+    {
+        DEBUGF("%s: Error No Buffer %s\n", __func__, filename);
+        close(fd);
+        return WPS_ERROR_INVALID_PARAM;
+    }
+    strcpy(skinbuf, buf);
+    close(fd);
+    token->value.data = PTRTOSKINOFFSET(skin_buffer, skinbuf);
+    token->type = SKIN_TOKEN_STRING;
+    return 0;
+failure:
+    element->type = COMMENT;
+    element->data = INVALID_OFFSET;
+    token->type = SKIN_TOKEN_NO_TOKEN;
+    return 0;
+}
+
 #ifdef HAVE_ALBUMART
 static int parse_albumart_load(struct skin_element* element,
                                struct wps_token *token,
@@ -2378,6 +2443,9 @@ static int skin_element_callback(struct skin_element* element, void* data)
                 case SKIN_TOKEN_FILE_DIRECTORY:
                     token->value.i = get_param(element, 0)->data.number;
                     break;
+                case SKIN_TOKEN_FILE_TEXT:
+                    function = parse_filetext;
+                    break;
 #ifdef HAVE_BACKDROP_IMAGE
                 case SKIN_TOKEN_VIEWPORT_FGCOLOUR:
                 case SKIN_TOKEN_VIEWPORT_BGCOLOUR:

apps/gui/skin_engine/skin_render.c

@@ -633,20 +633,23 @@ static int get_subline_timeout(struct gui_wps *gwps, struct skin_element* line)
         {
             token = SKINOFFSETTOPTR(skin_buffer, element->data);
             if (token)
-                return token->value.i;
+                retval = token->value.i;
         }
         else if (element->type == CONDITIONAL)
         {
             struct conditional *conditional = SKINOFFSETTOPTR(skin_buffer, element->data);
-            int val = evaluate_conditional(gwps, 0, conditional,
+            int val = evaluate_conditional(gwps, 0, conditional, element->children_count);
-                                           element->children_count);
+
-            if (val >= 0)
+            int tmoval = get_subline_timeout(gwps, get_child(element->children, val));
+            if (tmoval >= 0)
             {
-                retval = get_subline_timeout(gwps, get_child(element->children, val));
+                return MAX(retval, tmoval); /* Bugfix %t()%?CONDITIONAL tmo ignored */
-                if (retval >= 0)
-                    return retval;
             }
         }
+        else if (element->type == COMMENT)
+        {
+            retval = 0; /* don't display this item */
+        }
         element = SKINOFFSETTOPTR(skin_buffer, element->next);
     }
     return retval;
@@ -657,6 +660,7 @@ bool skin_render_alternator(struct skin_element* element, struct skin_draw_info
     bool changed_lines = false;
     struct line_alternator *alternator = SKINOFFSETTOPTR(skin_buffer, element->data);
     unsigned old_refresh = info->refresh_type;
+
     if (info->refresh_type == SKIN_REFRESH_ALL)
     {
         alternator->current_line = element->children_count-1;

apps/gui/skin_engine/wps_internals.h

@@ -82,6 +82,13 @@ struct wps_token {
     bool next;
 };
 
+
+struct wps_subline_timeout {
+    long next_tick;
+    unsigned short hide;
+    unsigned short show;
+};
+
 char* get_dir(char* buf, int buf_size, const char* path, int level);
 
 

apps/main.c

@@ -199,6 +199,18 @@ int main(void)
     }
 #endif
 
+#if !defined(BOOTLOADER)
+    if (!file_exists(ROCKBOX_DIR"/playername.txt"))
+    {
+        int fd = open(ROCKBOX_DIR"/playername.txt", O_CREAT|O_WRONLY|O_TRUNC, 0666);
+        if(fd >= 0)
+        {
+            fdprintf(fd, "%s!", str(LANG_ROCKBOX_TITLE));
+            close(fd);
+        }
+    }
+#endif
+
 #ifdef AUTOROCK
     {
         char filename[MAX_PATH];

manual/advanced_topics/main.tex

@@ -36,6 +36,13 @@ This configuration entry can only be created and edited with a text editor or
 the Main Menu Config Plugin (see \reference{ref:main_menu_config}).
 It is not possible to change this setting via the settings menu.
 
+\subsection{\label{ref:CustomisingThePlayername}Customising The Playername}
+
+Some themes (Cabbiev2) show a customizable playername in the Whats Playing Screen.
+Edit the first line of \fname{/.rockbox/playername.txt} to show your own message
+or leave an empty file to disable the feature, deleting the file will generate a new
+playername.txt file containing 'Rockbox!' next boot.
+
 \subsection{\label{ref:OpenPlugins}Open Plugin Menu Items}
 
 Rockbox allows you to choose a plugin to run for select menu options.

manual/appendix/wps_tags.tex

@@ -755,6 +755,21 @@ a horizontal progressbar which doesn't fill and draws the image
             0 is the first conditional option
 \end{description}
 
+\begin{tagmap}
+  \config{\%ft(filename [,line]} & Get a line of text from a file.\\
+\end{tagmap}
+    Use this tag to check for the existence of a file or read a line of text from a file.
+    Checking if a file exists can be done with \%?(ft(filename)<Found|NotFound>
+    similarly you can also check if a specific line exists with \%?(ft(filename, n)<Found|NotFound>
+     where n is the desired line.
+    Note: empty files or files that do not exist are ignored by the skin engine otherwise
+\begin{description}
+    \item[filename] -- filename Note: files can only be found in \fname{/.rockbox} directory or one of its children.
+            eg. \%ft(wps/file.txt) would refer to \fname{/.rockbox/wps/file.txt}
+    \item[line] -- OPTIONAL, which line to grab, defaults to the first line.
+                    Note: lines must end  with CR or LF but may not exceed 320 characters
+\end{description}
+
 \begin{tagmap}
   \config{\%(}           & The character `('\\
   \config{\%)}           & The character `)'\\

utils/skinupdater/tag_table.c

@@ -70,6 +70,7 @@ struct tag_info legal_tags[] =
     { "fn", "" },
     { "fp", "" },
     { "fs", "" },
+    { "ft", "" },
     { "fv", "" },
     { "d"  , "I" },
     

wps/cabbiev2.128x160x16.wps

@@ -55,7 +55,7 @@
 %s%ac%?it<%it|%fn>
 %s%ac%?ia<%ia|%?iA<%iA|%?d(2)<%d(2)|%(root%)>>>
 
-%s%acNext Track:
+%s%ac%Sx(Next Track:)
 %s%ac%?It<%It|%Fn>
 
 #Time and Playlist Info