Awesome window manager config for termux, to run firefox at responsive window size borderlessly

rc.lua

-- Import the Awesome WM libraries
local awful = require("awful")
local beautiful = require("beautiful")
local gears = require("gears")

-- Set the theme
beautiful.init(gears.filesystem.get_themes_dir() .. "default/theme.lua")

-- Remove titlebars, window topbars, and spacing
beautiful.titlebar_height = 0
beautiful.border_width = 0
beautiful.useless_gap = 0

-- Define the modkey (usually Mod4 is the Super/Windows key)
local modkey = "Mod4"

-- Table of layouts to cover with awful.layout.inc
awful.layout.layouts = {
    awful.layout.suit.tile,
    awful.layout.suit.floating,
}

-- Create a tag table for each screen
awful.screen.connect_for_each_screen(function(s)
    -- Each screen has its own tag table
    awful.tag({ "1", "2", "3", "4", "5", "6", "7", "8", "9" }, s, awful.layout.layouts[1])
end)

-- Key bindings
globalkeys = gears.table.join(
    awful.key({ modkey }, "Left", awful.tag.viewprev,
        { description = "view previous", group = "tag" }),
    awful.key({ modkey }, "Right", awful.tag.viewnext,
        { description = "view next", group = "tag" }),
    awful.key({ modkey }, "j", function() awful.client.focus.byidx(1) end,
        { description = "focus next by index", group = "client" }),
    awful.key({ modkey }, "k", function() awful.client.focus.byidx(-1) end,
        { description = "focus previous by index", group = "client" }),
    awful.key({ modkey, "Shift" }, "j", function() awful.client.swap.byidx(1) end,
        { description = "swap with next client by index", group = "client" }),
    awful.key({ modkey, "Shift" }, "k", function() awful.client.swap.byidx(-1) end,
        { description = "swap with previous client by index", group = "client" }),
    awful.key({ modkey }, "Return", function() awful.spawn("termux-x11") end,
        { description = "open termux-x11", group = "launcher" }),
    awful.key({ modkey, "Control" }, "r", awesome.restart,
        { description = "reload awesome", group = "awesome" }),
    awful.key({ modkey, "Shift" }, "q", awesome.quit,
        { description = "quit awesome", group = "awesome" })
)

-- Define client keys
clientkeys = gears.table.join(
    awful.key({ modkey }, "f", function(c)
        c.fullscreen = not c.fullscreen
        c:raise()
    end, { description = "toggle fullscreen", group = "client" }),
    awful.key({ modkey, "Shift" }, "c", function(c) c:kill() end,
        { description = "close", group = "client" })
)

-- Define client buttons
clientbuttons = gears.table.join(
    awful.button({}, 1, function(c)
        c:emit_signal("request::activate", "mouse_click", { raise = true })
    end),
    awful.button({ modkey }, 1, function(c)
        c:emit_signal("request::activate", "mouse_click", { raise = true })
        awful.mouse.client.move(c)
    end),
    awful.button({ modkey }, 3, function(c)
        c:emit_signal("request::activate", "mouse_click", { raise = true })
        awful.mouse.client.resize(c)
    end)
)

-- Set keys
root.keys(globalkeys)

-- Rules to apply to new clients (through the "manage" signal)
awful.rules.rules = {
    -- All clients will match this rule.
    { rule = {},
      properties = {
        border_width = 0,
        focus = awful.client.focus.filter,
        raise = true,
        keys = clientkeys,
        buttons = clientbuttons,
        screen = awful.screen.preferred,
        placement = awful.placement.no_overlap + awful.placement.no_offscreen
      }
    },

    -- Floating clients.
    { rule_any = {
        instance = {
            "DTA",  -- Firefox addon DownThemAll.
            "copyq",  -- Includes session name in class.
        },
        class = {
            "Arandr",
            "Gpick",
            "Kruler",
            "MessageWin",  -- kalarm.
            "Sxiv",
            "Wpa_gui",
            "pinentry",
            "veromix",
            "xtightvncviewer"
        },
        name = {
            "Event Tester",  -- xev.
        },
        role = {
            "AlarmWindow",  -- Thunderbird's calendar.
            "pop-up",       -- e.g. Google Chrome's (detached) Developer Tools.
        }
    }, properties = { floating = true }},
}

-- Signal function to execute when a new client appears.
client.connect_signal("manage", function(c)
    -- Set the windows at the slave,
    -- i.e., put it at the end of others instead of setting it master.
    if not awesome.startup then awful.client.setslave(c) end

    if awesome.startup and
        not c.size_hints.user_position and
        not c.size_hints.program_position then
        -- Prevent clients from being unreachable after screen count changes.
        awful.placement.no_offscreen(c)
    end
end)

-- Remove titlebars
client.connect_signal("request::titlebars", function(c)
    awful.titlebar(c, { size = 0 }):setup {}
end)