mpd and yawn widget are now asynchronous

asyncshell.lua

@@ -13,6 +13,8 @@
 -- ...synchronously
 -- wwidget.text = asyncshell.demand('wscript -Kiev', 5):read("*l") or "Error"
 
+-- This makes things faster, but puts weight on sysload and is more cpu demanding.
+
 local spawn = require('awful.util').spawn
 
 asyncshell               = {}

widgets/mpd.lua

@@ -8,6 +8,7 @@
 --]]
 
 local helpers      = require("lain.helpers")
+local async        = require("lain.asyncshell")
 
 local escape_f     = require("awful.util").escape
 local naughty      = require("naughty")
@@ -50,6 +51,7 @@ local function worker(args)
     helpers.set_map("current mpd track", nil)
 
     function mpd.update()
+        async.request(echo .. " | curl --connect-timeout 1 -fsm 3 " .. mpdh, function (f)
             mpd_now = {
                 state  = "N/A",
                 file   = "N/A",
@@ -59,8 +61,6 @@ local function worker(args)
                 date   = "N/A"
             }
 
-        local f = io.popen(echo .. " | curl --connect-timeout 1 -fsm 3 " .. mpdh)
-
             for line in f:lines() do
                 for k, v in string.gmatch(line, "([%w]+):[%s](.*)$") do
                     if     k == "state"  then mpd_now.state  = v
@@ -73,8 +73,6 @@ local function worker(args)
                 end
             end
 
-        f:close()
-
             mpd_notification_preset.text = string.format("%s (%s) - %s\n%s", mpd_now.artist,
                                            mpd_now.album, mpd_now.date, mpd_now.title)
             widget = mpd.widget
@@ -100,6 +98,7 @@ local function worker(args)
             then
                 helpers.set_map("current mpd track", nil)
             end
+        end)
     end
 
     helpers.newtimer("mpd", timeout, mpd.update)

widgets/yawn/init.lua

@@ -7,6 +7,7 @@
 --]]
 
 local newtimer     = require("lain.helpers").newtimer
+local async        = require("lain.asyncshell")
 
 local naughty      = require("naughty")
 local wibox        = require("wibox")
@@ -47,7 +48,9 @@ yawn_notification_preset = {}
 
 local function fetch_weather()
     local url = api_url .. units_set .. city_id
-    local f = io.popen("curl --connect-timeout 1 -fsm 3 '" .. url .. "'" )
+    local cmd = "curl --connect-timeout 1 -fsm 3 '" .. url .. "'"
+
+    async.request(cmd, function(f)
         local text = f:read("*a")
         f:close()
 
@@ -140,6 +143,7 @@ local function fetch_weather()
         units = units:gsub(" ", "")
 
         settings()
+    end)
 end
 
 function yawn.hide()