[mpd] Deprecate io.popen

Changes.md

@@ -20,7 +20,7 @@ Fixed:
 - Deprecate the use of `io.popen` in following widgets:
     * wifi_linux, wifiiw_linux
     * bat_freebsd, mem_freebsd, net_freebsd
-    * volume, gmail, mdir
+    * volume, gmail, mdir, mpd
 - [mpd] Lua 5.3 compatibility (for real this time); also correct a typo
 - [pkg,weather,contrib/btc] Allow function call without Awesome
 - [pkg] Use more updated front-ends for Debian/Ubuntu (apt) and Fedora (dnf)

widgets/mpd_all.lua

@@ -5,11 +5,10 @@
 
 -- {{{ Grab environment
 local tonumber = tonumber
-local io = { popen = io.popen }
-local setmetatable = setmetatable
-local string = { gmatch = string.gmatch }
-local helpers = require("vicious.helpers")
 local math = { floor = math.floor }
+
+local helpers = require"vicious.helpers"
+local spawn = require"vicious.spawn"
 -- }}}
 
 
@@ -55,7 +54,7 @@ end
 -- }}}
 
 -- {{{ MPD widget type
-local function worker(format, warg)
+function mpd_all.async(format, warg, callback)
     -- Fallback values
     local mpd_state = {
         ["{volume}"]   = 0,
@@ -81,9 +80,9 @@ local function worker(format, warg)
         warg and (warg.port or warg[3]) or "6600")
 
     -- Get data from MPD server
-    local f = io.popen(query .. "|" .. connect)
-    for line in f:lines() do
-        for k, v in string.gmatch(line, "([%w]+):[%s](.*)$") do
+    spawn.with_line_callback_with_shell(query .. "|" .. connect, {
+        stdout = function (line)
+            for k, v in line:gmatch"([%w]+):[%s](.*)$" do
                 local key = "{" .. k .. "}"
                 if k == "volume" or k == "bitrate" or
                    k == "elapsed" or k == "duration" then
@@ -98,19 +97,17 @@ local function worker(format, warg)
                     mpd_state[key] = v
                 end
             end
-    end
-    f:close()
-
+        end,
+        output_done = function ()
             -- Formatted elapsed and duration
             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
+            callback(mpd_state)
+        end })
 end
 -- }}}
 
-return setmetatable(mpd_all, { __call = function(_, ...) return worker(...) end })
+return helpers.setasyncall(mpd_all)