[mpd] Add playing progress percentage (#80)

README.md

@@ -360,7 +360,7 @@ Supported platforms: platform independent (required tools: `curl`).
   fields will be fallen back to default (`localhost:6600` without password).
 * Returns a table with string keys: `${volume}`, `${bitrate}`, `${elapsed}` (in seconds),
   `${duration}` (in seconds), `${Elapsed}` (formatted as [hh:]mm:ss), `${Duration}` (formatted as [hh:]mm:ss),
-  `${random}`, `${repeat}`, `${state}`, `${Artist}`, `${Title}`, `${Album}`,
+  `${Progress}` (in percentage), ${random}`, `${repeat}`, `${state}`, `${Artist}`, `${Title}`, `${Album}`,
   `${Genre}` and optionally `${Name}` and `${file}`.
 
 ### vicious.widgets.net

widgets/mpd_all.lua

@@ -43,6 +43,16 @@ function format_progress(elapsed, duration)
 end
 -- }}}
 
+-- {{{ Format playing progress (percentage)
+function format_progress_percentage(elapsed, duration)
+    if duration > 0 then
+        local percentage = math.floor((elapsed / duration) * 100 + 0.5)
+        return ("%d%%"):format(percentage)
+    else
+        return("0%")
+end
+-- }}}
+
 -- {{{ MPD widget type
 local function worker(format, warg)
     -- Fallback values
@@ -94,6 +104,10 @@ local function worker(format, warg)
     mpd_state["{Elapsed}"], mpd_state["{Duration}"] = format_progress(
         mpd_state["{elapsed}"], mpd_state["{duration}"])
 
+    -- Formatted playing progress percentage
+    mpd_state["{Progress}"] = format_progress_percentage(
+        mpd_state["{elapsed}"], mpd_state["{duration}"])
+
     return mpd_state
 end
 -- }}}