My styled wezterm config - just the relevant bits

colors.lua

local wezterm = require 'wezterm'

local color_default_fg_light = wezterm.color.parse("#cacaca") -- 💩
local color_default_fg_dark = wezterm.color.parse("#303030")

return {
  VERIDIAN = {
    bg = wezterm.color.parse("#4D8060"),
    fg = color_default_fg_light
  },
  PAYNE = {
    bg = wezterm.color.parse("#385F71"),
    fg = color_default_fg_light
  },
  INDIGO = {
    bg = wezterm.color.parse("#7C77B9"),
    fg = color_default_fg_light
  },
  CAROLINA = {
    bg = wezterm.color.parse("#8FBFE0"),
    fg = color_default_fg_dark
  },
  FLAME = {
    bg = wezterm.color.parse("#D36135"),
    fg = color_default_fg_dark
  },
  JET = {
    bg = wezterm.color.parse("#282B28"),
    fg = color_default_fg_light
  },
  TAUPE = {
    bg = wezterm.color.parse("#785964"),
    fg = color_default_fg_light
  },
  ECRU = {
    bg = wezterm.color.parse("#C6AE82"),
    fg = color_default_fg_dark
  },
  VIOLET = {
    bg = wezterm.color.parse("#685F74"),
    fg = color_default_fg_light
  },
  VERDIGRIS = {
    bg = wezterm.color.parse("#28AFB0"),
    fg = color_default_fg_light
  }
}

pics.md

wezterm.lua

local wezterm = require 'wezterm'

local color = (function()
  local COLOR = require "colors"

  local coolors = {
    COLOR.VERIDIAN,
    COLOR.PAYNE,
    COLOR.INDIGO,
    COLOR.CAROLINA,
    COLOR.FLAME,
    COLOR.JET,
    COLOR.TAUPE,
    COLOR.ECRU,
    COLOR.VIOLET,
    COLOR.VERDIGRIS
  }

  return coolors[math.random(#coolors)]
end)()

local color_primary = color

local title_color_bg = color_primary.bg
local title_color_fg = color_primary.fg

local color_off = title_color_bg:lighten(0.4)
local color_on = color_off:lighten(0.4)
wezterm.on('update-right-status', function(window)
  local bat = ''
  local b = wezterm.battery_info()[1]
  bat = wezterm.format {
    { Foreground = {
      Color =
        b.state_of_charge > 0.2 and color_on or color_off,
    } },
    { Text = '▉' },
    { Foreground = {
      Color =
        b.state_of_charge > 0.4 and color_on or color_off,
    } },
    { Text = '▉' },
    { Foreground = {
      Color =
        b.state_of_charge > 0.6 and color_on or color_off,
    } },
    { Text = '▉' },
    { Foreground = {
      Color =
        b.state_of_charge > 0.8 and color_on or color_off,
    } },
    { Text = '▉' },
    { Background = {
      Color =
        b.state_of_charge > 0.98 and color_on or color_off,
    } },
    { Foreground = {
      Color =
        b.state == "Charging"
          and color_on:lighten(0.3):complement()
          or
            (b.state_of_charge < 0.2 and wezterm.GLOBAL.count % 2 == 0)
              and color_on:lighten(0.1):complement()
              or color_off:darken(0.1)
    } },
    { Text = ' ⚡ ' },
  }

  local time = wezterm.strftime '%-l:%M %P'

  local bg1 = title_color_bg:lighten(0.1)
  local bg2 = title_color_bg:lighten(0.2)

  window:set_right_status(
    wezterm.format {
      { Background = { Color = title_color_bg } },
      { Foreground = { Color = bg1 } },
      { Text = '' },
      { Background = { Color = title_color_bg:lighten(0.1) } },
      { Foreground = { Color = title_color_fg } },
      { Text = ' ' .. window:active_workspace() .. ' ' },
      { Foreground = { Color = bg1 } },
      { Background = { Color = bg2 } },
      { Text = '' },
      { Foreground = { Color = title_color_bg:lighten(0.4) } },
      { Foreground = { Color = title_color_fg } },
      { Text = ' ' .. time .. ' ' .. bat }
    }
  )
end)

wezterm.on('gui-startup', function(cmd)
  local mux = wezterm.mux

  local padSize = 80
  local screenWidth = 2560
  local screenHeight = 1600

  local tab, pane, window = mux.spawn_window(cmd or {
    workspace = 'main',
  })

  local icons = {
    '🌞',
    '🍧',
    '🫠',
    '🏞️',
    '📑',
    '🪁',
    '🧠',
    '🦥',
    '🦉',
    '📀',
    '🌮',
    '🍜',
    '🧋',
    '🥝',
    '🍊',
  }

  tab:set_title('  ' .. icons[math.random(#icons)] .. '  ')

  if window ~= nil then
    window:gui_window():set_position(padSize, padSize)
    window:gui_window():set_inner_size(screenWidth - (padSize * 2), screenHeight - (padSize * 2) - 48)
  end
end)

local TAB_EDGE_LEFT = wezterm.nerdfonts.ple_left_half_circle_thick
local TAB_EDGE_RIGHT = wezterm.nerdfonts.ple_right_half_circle_thick

local function tab_title(tab_info)
  local title = tab_info.tab_title

  if title and #title > 0 then return title end

  return tab_info.active_pane.title:gsub("%.exe", "")
end

wezterm.on(
  'format-tab-title',
  function(tab, _, _, _, hover, max_width)
    local edge_background = title_color_bg
    local background = title_color_bg:lighten(0.05)
    local foreground = title_color_fg

    if tab.is_active then
      background = background:lighten(0.1)
      foreground = foreground:lighten(0.1)
    elseif hover then
      background = background:lighten(0.2)
      foreground = foreground:lighten(0.2)
    end

    local edge_foreground = background

    local title = tab_title(tab)

    -- ensure that the titles fit in the available space,
    -- and that we have room for the edges.
    title = wezterm.truncate_right(title, max_width - 2)

    return {
      { Background = { Color = edge_background } },
      { Foreground = { Color = edge_foreground } },
      { Text = TAB_EDGE_LEFT },
      { Background = { Color = background } },
      { Foreground = { Color = foreground } },
      { Text = title },
      { Background = { Color = edge_background } },
      { Foreground = { Color = edge_foreground } },
      { Text = TAB_EDGE_RIGHT },
    }
  end
)

return {
  colors = {
    tab_bar = {
      active_tab = {
        bg_color = title_color_bg:lighten(0.03),
        fg_color = title_color_fg:lighten(0.8),
        intensity = "Bold",
      },
      inactive_tab = {
        bg_color = title_color_bg:lighten(0.01),
        fg_color = title_color_fg,
        intensity = "Half",
      },
      inactive_tab_edge = title_color_bg
    },
    split = title_color_bg:lighten(0.3):desaturate(0.5)
  },
  window_background_opacity = 0.6,
  window_frame = {
    active_titlebar_bg = title_color_bg,
    inactive_titlebar_bg = title_color_bg,
    font_size = 10.0,
  },

  window_decorations = 'RESIZE',
  win32_system_backdrop = "Acrylic",
  show_tab_index_in_tab_bar = false,
  show_new_tab_button_in_tab_bar = false,
}

Thank you for this gist, I love the look of the tab bar with this!
But one question: In the demo (wezterm/wezterm#628 (comment)) you show that the workspaces are listed in the top right - but for me, only the active one is displayed. Is this gist not quite up to date?

Also - any idea if it is possible to set the tab title to a random emoji not just for the first, but for all new tabs aswell?
TIA!

Hi! The workspace stuff is not included here, I'll probably make a plugin of it when I get around to it. To always have an emoji title, you can update the 'format-tab-title' handler to set the emoji - replace or append to the { Text = title } part.

Thanks for the info, I'd love to get my hands on that - let me know if I can help out :)
I worked a little on the Emoji thing, and now I got it to work for all tabs, not just the first one - and its persistent, so the emojis don't switch after running a command.

In case you're interested:
I'm using the Pure theme which supports setting the prompt character through an environment variable.
When zsh launches, it picks a random emoji from a list (in ~/.zshrc) and exports that.
Then, with WezTerm shell integration, I have zsh execute __wezterm_set_user_var "ICON" $PURE_PROMPT_SYMBOL to pass the picket emoji as a user variable to WezTerm.
This user var can now be referenced in .wezterm.lua when setting the tab title.

I might write up a little gist for this sometime.

Oh and something I just realized: this throws an error if there is no battery present (desktop PC).
I ended up with this:

    local b = wezterm.battery_info()[1]
    if b then
       -- original code...
    else 
      bat = wezterm.format {
          { Text = '🖥' },
      }
    end

I'll try to remember to comment here when I make the plugin, I'm partly waiting to see if wezterm/wezterm#4248 gets merged and plugins get documented before doing that.

I might write up a little gist for this sometime.

Go for it, seems interesting! I was planning to try setting the workspace color in env and doing some dynamic colorscheme generation, that may be helpful.

Wrote the gist, have fun :)

(Still interested in that workspace indiciator 😋)