subit: add option to force download

Author: wiiaboo

Diff for: subit.lua

@@ -21,6 +21,7 @@ o = {
     path = "subliminal",    -- absolute path to subliminal if not on PATH
     languages = "en,pt-PT", -- list of IETF languages to search
     forceutf8 = true,       -- Force subtitles to be saved as utf-8
+    forcedownload = false,  -- Force download of all languages requested
 
     -- Some providers need credentials to be used.
     -- This isn't necessary unless you want these providers.
@@ -98,6 +99,12 @@ function main()
         table.insert(t.args, "utf-8")
     end
 
+    if o.forcedownload then
+        -- (if false, won't download English subs if subtitles
+        --  are already embedded in the container or present in the dir)
+        table.insert(t.args, "-f")
+    end
+
     table.insert(t.args, path)
     msg.debug(string.format("Running: \"%s\"", table.concat(t.args,'" "')))
     local res = utils.subprocess(t)