Add awful.widget.tasklist.filter.minimizedcurrenttags

Added function to show only minimized clients in the taskbar for the
 current tag.

 Signed-off-by: Danny Navarro <j@dannynavarro.net>

Signed-off-by: Uli Schlachter <psychon@znc.in>

lib/awful/widget/tasklist.lua.in

@@ -159,6 +159,32 @@ function filter.currenttags(c, screen)
     return false
 end
 
+--- Filtering function to include only the minimized clients from currently selected tags.
+-- @param c The client.
+-- @param screen The screen we are drawing on.
+-- @return true if c is in a selected tag on screen and is minimized, false otherwise
+function filter.minimizedcurrenttags(c, screen)
+    -- Only print client on the same screen as this widget
+    if c.screen ~= screen then return false end
+    -- Include sticky client
+    if c.sticky then return true end
+    -- Check client is minimized
+    if not c.minimized then return false end
+    tags = capi.screen[screen]:tags()
+    for k, t in ipairs(tags) do
+        -- Select only minimized clients
+        if t.selected then
+            local ctags = c:tags()
+            for _, v in ipairs(ctags) do
+                if v == t then
+                    return true
+                end
+            end
+        end
+    end
+    return false
+end
+
 --- Filtering function to include only the currently focused client.
 -- @param c The client.
 -- @param screen The screen we are drawing on.