awful.prompt: add new field 'text' to run() args

Signed-off-by: koniu <gkusnierz@gmail.com>

lib/awful/prompt.lua.in

@@ -131,18 +131,19 @@ end
 function run(args, textbox, exe_callback, completion_callback, history_path, history_max, done_callback)
     local theme = beautiful.get()
     if not args then args = {} end
-    local command = ""
+    local command = args.text or ""
     local command_before_comp
     local cur_pos_before_comp
     local prettyprompt = args.prompt or ""
     local inv_col = args.fg_cursor or theme.fg_focus or "black"
     local cur_col = args.bg_cursor or theme.bg_focus or "white"
     local cur_ul = args.ul_cursor
+    local text = args.text or ""
 
     history_check_load(history_path, history_max)
     local history_index = history_items(history_path) + 1
     -- The cursor position
-    local cur_pos = 1
+    local cur_pos = text:len() + 1
     -- The completion element to use on completion request.
     local ncomp = 1
     if not textbox or not exe_callback then