From 43470e3b516b49e7bdb7559e9ed0af0809d16212 Mon Sep 17 00:00:00 2001
From: Anton Khirnov <anton@khirnov.net>
Date: Tue, 26 Oct 2021 21:05:31 +0200
Subject: bindings: add a binding for toggling auto-mute

---
 bindings.lua  |  1 +
 utils.lua     | 54 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 workspace.lua |  1 +
 3 files changed, 56 insertions(+)

diff --git a/bindings.lua b/bindings.lua
index 8aa9d48..ebaf864 100644
--- a/bindings.lua
+++ b/bindings.lua
@@ -35,6 +35,7 @@ function M.create(workspace)
         awful.key({ modkey },   "Prior",  function () utils.vol_control(1)           end),
         awful.key({ modkey },   "Next",   function () utils.vol_control(-1)          end),
         awful.key({ modkey },   "End",    utils.vol_mute_toggle),
+        awful.key({ modkey },   "Delete", function () utils.auto_mute_toggle(workspace.notify_tbl, 'auto_mute') end),
         awful.key({ modkey },   "grave",  function () awful.spawn("mpc toggle") end),
         awful.key({ modkey },   "b",      function () awful.spawn("mpc next")   end),
         awful.key({ modkey },   "p",      function () awful.spawn("mpc prev")   end),
diff --git a/utils.lua b/utils.lua
index 3a02c24..6fc40c5 100644
--- a/utils.lua
+++ b/utils.lua
@@ -40,6 +40,60 @@ function M.vol_mute_toggle()
     awful.spawn("amixer -q set Master toggle")
 end
 
+function M.auto_mute_toggle(notify_tbl, notify_tbl_key)
+    local control = "'Auto-Mute Mode'"
+    awful.spawn.easy_async("amixer sget " .. control,
+        function(stdout, stderr, exitreason, exitcode)
+            if exitcode ~= 0 then
+                naughty.notify({ preset = naughty.config.presets.warn,
+                                 title  = "Error getting the auto-mute mode",
+                                 text   = stderr })
+                return
+            end
+
+            -- parse valid auto-mute items
+            local items_raw = string.match(stdout, "\n%s*Items:%s*([^\n]+)\n")
+            local items = {}
+            for item in string.gmatch(items_raw, "'[^']+'") do
+                table.insert(items, item)
+            end
+
+            -- parse current item
+            local cur_item = string.match(stdout, "\n%s*Item0:%s*('[^'\n]+')\n")
+
+            -- find the next item
+            local next_item = nil
+            for i, v in ipairs(items) do
+                if v == cur_item then
+                    next_item = items[(i % #items) + 1]
+                    break
+                end
+            end
+            if next_item == nil then return end
+
+            -- set the next item
+            awful.spawn.easy_async('amixer -q sset ' .. control .. ' ' .. next_item,
+                function(stdout, stderr, exitreason, exitcode)
+                    if exitcode ~= 0 then
+                        naughty.notify({ preset = naughty.config.presets.warn,
+                                         title  = "Error setting the auto-mute mode",
+                                         text   = stderr })
+                        return
+                    end
+
+                    local args = { title  = "Auto-mute", text   = next_item }
+
+                    local prev_notify = notify_tbl[notify_tbl_key]
+                    if prev_notify and prev_notify.box.visible then
+                        args.replaces_id = prev_notify.id
+                    end
+
+                    notify_tbl[notify_tbl_key] = naughty.notify(args)
+                end
+            )
+        end)
+end
+
 function M.spawn_current(command)
     awful.spawn(command, {tag = mouse.screen.selected_tag})
 end
diff --git a/workspace.lua b/workspace.lua
index db9973a..732caef 100644
--- a/workspace.lua
+++ b/workspace.lua
@@ -195,6 +195,7 @@ function Workspace:new(layouts)
     o.desktops     = {}
     o.screen_state = {}
     o.layouts      = layouts
+    o.notify_tbl   = {}
 
     o.signals   = object()
 
-- 
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