dotfiles/dot_config/wezterm/wezterm.lua

local wezterm = require("wezterm")
local act = wezterm.action
local wsl_domains = wezterm.default_wsl_domains()

-- WSL related
for _, dom in ipairs(wsl_domains) do
    dom.default_cwd = "~"
end

local function get_os()
    local target = wezterm.target_triple
    if string.find(target, "linux") then
        return "linux"
    elseif string.find(target, "darwin") then
        return "macos"
    else
        return "windows"
    end
end

if get_os() == "windows" then
    default_prog = { "wsl.exe", "~", "-d", "Ubuntu-20.04" }
    default_domain = "WSL:Ubuntu-20.04"
end

-- Superscript/Subscript
local function numberStyle(number, script)
    local scripts = {
        superscript = {
            "⁰",
            "¹",
            "²",
            "³",
            "⁴",
            "⁵",
            "⁶",
            "⁷",
            "⁸",
            "⁹",
        },
        subscript = {
            "₀",
            "₁",
            "₂",
            "₃",
            "₄",
            "₅",
            "₆",
            "₇",
            "₈",
            "₉",
        },
    }
    local numbers = scripts[script]
    local number_string = tostring(number)
    local result = ""
    for i = 1, #number_string do
        local char = number_string:sub(i, i)
        local num = tonumber(char)
        if num then
            result = result .. numbers[num + 1]
        else
            result = result .. char
        end
    end
    return result
end

-- Custom Tab Bar
wezterm.on("format-tab-title", function(tab, tabs, panes, config, hover, max_width)
    local RIGHT_DIVIDER = utf8.char(0xe0bc)
    local colours = config.resolved_palette.tab_bar

    local active_tab_index = 0
    for _, t in ipairs(tabs) do
        if t.is_active == true then
            active_tab_index = t.tab_index
        end
    end

    local active_bg = colours.active_tab.bg_color
    local active_fg = colours.active_tab.fg_color
    local inactive_bg = colours.inactive_tab.bg_color
    local inactive_fg = colours.inactive_tab.fg_color
    local new_tab_bg = colours.new_tab.bg_color

    local s_bg, s_fg, e_bg, e_fg

    -- the last tab
    if tab.tab_index == #tabs - 1 then
        if tab.is_active then
            s_bg = active_bg
            s_fg = active_fg
            e_bg = new_tab_bg
            e_fg = active_bg
        else
            s_bg = inactive_bg
            s_fg = inactive_fg
            e_bg = new_tab_bg
            e_fg = inactive_bg
        end
    elseif tab.tab_index == active_tab_index - 1 then
        s_bg = inactive_bg
        s_fg = inactive_fg
        e_bg = active_bg
        e_fg = inactive_bg
    elseif tab.is_active then
        s_bg = active_bg
        s_fg = active_fg
        e_bg = inactive_bg
        e_fg = active_bg
    else
        s_bg = inactive_bg
        s_fg = inactive_fg
        e_bg = inactive_bg
        e_fg = inactive_bg
    end

    local muxpanes = wezterm.mux.get_tab(tab.tab_id):panes()
    local count = #muxpanes == 1 and "" or #muxpanes

    return {
        { Background = { Color = s_bg } },
        { Foreground = { Color = s_fg } },
        {
            Text = " "
                .. tab.tab_index + 1
                .. ": "
                .. tab.active_pane.title
                .. numberStyle(count, "superscript")
                .. " ",
        },
        { Background = { Color = e_bg } },
        { Foreground = { Color = e_fg } },
        { Text = RIGHT_DIVIDER },
    }
end)

return {
    color_scheme = "Catppuccin Mocha",
    font = wezterm.font_with_fallback({ "VictorMono Nerd Font" }),
    font_size = 14,
    background = {
        {
            source = { File = "Pictures/astronaut.png" },
            hsb = { brightness = 0.15, hue = 1.0, saturation = 0.1 },
        },
    },

    default_domain = default_domain,
    wsl_domains = wsl_domains,
    default_prog = default_prog,

    window_padding = { top = 0, bottom = 0, left = 0, right = 0 },
    adjust_window_size_when_changing_font_size = false,
    window_decorations = "RESIZE",
    window_close_confirmation = "NeverPrompt",

    use_fancy_tab_bar = false,
    tab_bar_at_bottom = true,
    hide_tab_bar_if_only_one_tab = true,
    tab_max_width = 32,
    scrollback_lines = 1000000,

    exit_behavior = "CloseOnCleanExit",
    clean_exit_codes = { 130 },
    audible_bell = "Disabled",
    disable_default_key_bindings = false,

    keys = {
        -- Fullscreen
        { key = "F11", action = wezterm.action.ToggleFullScreen },
        -- Zoom
        { key = "z", mods = "ALT|SHIFT", action = wezterm.action.TogglePaneZoomState },
        -- Copy / Paste
        { key = "C", mods = "CTRL", action = wezterm.action.Copy },
        { key = "V", mods = "CTRL", action = act.PasteFrom("Clipboard") },

        -- Open Pane
        -- https://github.com/wez/wezterm/discussions/2426
        -- https://github.com/neovim/neovim/issues/2252
        {
            key = "n",
            mods = "ALT|SHIFT",
            action = wezterm.action_callback(function(window, pane)
                if pane:get_title() == "nvim" then
                    window:perform_action(act.SendKey({ key = "n", mods = "ALT|SHIFT" }), pane)
                else
                    window:perform_action(act.SplitPane({ direction = "Right", size = { Percent = 50 } }), pane)
                end
            end),
        },
        {
            key = "m",
            mods = "ALT|SHIFT",
            action = wezterm.action_callback(function(window, pane)
                if pane:get_title() == "nvim" then
                    window:perform_action(act.SendKey({ key = "m", mods = "ALT|SHIFT" }), pane)
                else
                    window:perform_action(act.SplitPane({ direction = "Down", size = { Percent = 50 } }), pane)
                end
            end),
        },

        -- Navigating Panes
        { key = "h", mods = "ALT|SHIFT", action = act.ActivatePaneDirection("Left") },
        { key = "l", mods = "ALT|SHIFT", action = act.ActivatePaneDirection("Right") },
        { key = "k", mods = "ALT|SHIFT", action = act.ActivatePaneDirection("Up") },
        { key = "j", mods = "ALT|SHIFT", action = act.ActivatePaneDirection("Down") },
        -- Close Pane
        { key = "c", mods = "ALT|SHIFT", action = wezterm.action.CloseCurrentPane({ confirm = false }) },
        -- Swap Panes
        { key = "i", mods = "ALT|SHIFT", action = act.PaneSelect({ alphabet = "asdfghjkl;", mode = "Activate" }) },
        {
            key = "s",
            mods = "ALT|SHIFT",
            action = act.PaneSelect({ alphabet = "asdfghjkl;", mode = "SwapWithActive" }),
        },
        -- Resize Panes
        { key = "LeftArrow", mods = "ALT|SHIFT", action = act({ AdjustPaneSize = { "Left", 5 } }) },
        { key = "DownArrow", mods = "ALT|SHIFT", action = act({ AdjustPaneSize = { "Down", 5 } }) },
        { key = "UpArrow", mods = "ALT|SHIFT", action = act({ AdjustPaneSize = { "Up", 5 } }) },
        { key = "RightArrow", mods = "ALT|SHIFT", action = act({ AdjustPaneSize = { "Right", 5 } }) },

        -- New Tab
        { key = "n", mods = "CTRL|SHIFT", action = act({ SpawnTab = "CurrentPaneDomain" }) },
        -- Swap Tabs
        { key = "h", mods = "CTRL|SHIFT", action = act.ActivateTabRelative(-1) },
        { key = "l", mods = "CTRL|SHIFT", action = act.ActivateTabRelative(1) },

        -- Open Links
        {
            key = "o",
            mods = "ALT|SHIFT",
            action = wezterm.action.QuickSelectArgs({
                label = "open url",
                patterns = {
                    "https?://\\S+",
                },
                action = wezterm.action_callback(function(window, pane)
                    local url = window:get_selection_text_for_pane(pane)
                    wezterm.open_with(url)
                end),
            }),
        },

        -- ScrollBack To Prompt
        { key = "UpArrow", mods = "CTRL|SHIFT", action = act.ScrollToPrompt(-1) },
        { key = "DownArrow", mods = "CTRL|SHIFT", action = act.ScrollToPrompt(1) },
    },
}