awesome: Add switcher (Alt-Tab like)

1 files changed, 111 insertions, 0 deletions

diff --git a/.config/awesome/switcher.lua b/.config/awesome/switcher.lua
new file mode 100644
index 0000000..6066879
--- /dev/null
+++ b/.config/awesome/switcher.lua
@@ -0,0 +1,111 @@
+----------------------------------------------------------------
+-- ALt-Tab-style switcher.
+----------------------------------------------------------------
+-- Benjamin Franzke <benjaminfranzke@googlemail.com
+-- Licensed under the GPL-3
+----------------------------------------------------------------
+-- To use this module add:
+--   require("switcher")
+-- to the top of your rc.lua. 
+--
+-- And add the following to your global keybindings:
+--   awful.key({ modkey, }, "Tab", function()
+--     switcher.start( 1, "Super_L", "Tab", "ISO_Left_Tab")
+--   end),
+--
+--   awful.key({ modkey, }, "ISO_Left_Tab", function()
+--     switcher.start(-1, "Super_L", "Tab", "ISO_Left_Tab")
+--   end),
+--
+----------------------------------------------------------------
+
+-- Grab environment
+local ipairs = ipairs
+local pairs = pairs
+local awful = require("awful")
+local naughty = require("naughty")
+local table = table
+local capi = {
+	tag = tag,
+	mouse = mouse,
+	client = client,
+	screen = screen,
+	wibox = wibox,
+	timer = timer,
+	keygrabber = keygrabber,
+}
+
+-- Switcher: Alt-Tab-like switching
+module("switcher")
+
+local state = {
+	switcher_idx = 0,
+	key_mod = "Super_L",
+	key_next = "Tab",
+	key_prev = "ISO_Left_Tab",
+}
+
+local function switcher_next(rel)
+
+	local cla = awful.client.focus.history.get(capi.mouse.screen, state.switcher_idx)
+	local cli = awful.client.focus.history.get(capi.mouse.screen, state.switcher_idx + rel)
+
+	awful.client.unmark(cla)
+
+	state.switcher_idx = state.switcher_idx + rel
+
+	if not cli then
+		if rel > 0 then
+			state.switcher_idx = rel
+		elseif rel < 0 then
+			local i = 0
+			local c = awful.client.focus.history.get(capi.mouse.screen, 0)
+			while c do
+				i = i + 1
+				c = awful.client.focus.history.get(capi.mouse.screen, i)
+			end
+			state.switcher_idx = i - rel
+		end
+
+		cli = awful.client.focus.history.get(capi.mouse.screen, switcher_idx)
+	end
+
+	cli:raise()
+
+	awful.client.mark(cli)
+end
+
+local function switcher_end()
+	local c = awful.client.focus.history.get(capi.mouse.screen, state.switcher_idx)
+	state.switcher_idx = 0
+	c:raise()
+	awful.client.unmark(c)
+	capi.client.focus = c
+end
+
+function switch(modifiers, key, event)
+	if event == "press" and key == state.key_next then
+		switcher_next(1)
+	elseif event == "press" and key == state.key_prev then
+		switcher_next(-1)
+	end
+
+	if event == "release" and key == state.key_mod then
+		switcher_end()
+		capi.keygrabber.stop()
+		return false
+	end
+
+	return true
+end
+
+function start(rel, key_mod, key_next, key_prev)
+	state.switcher_idx = 0
+	state.key_mod = key_mod
+	state.key_next = key_next
+	state.key_prev = key_prev
+
+	switcher_next(rel)
+	capi.keygrabber.run(switch)
+end
+