WezTerm configuration

wezterm.lua

local wezterm = require 'wezterm'

wezterm.on('format-window-title', function(tab, pane, tabs, panes, config)
  local zoomed = ' 🗗 '
  if tab.active_pane.is_zoomed then
    zoomed = ' 🗖 '
  end

  local index = ''
  if #tabs > 1 then
    index = string.format('[%d/%d] ', tab.tab_index + 1, #tabs)
  end

  return zoomed .. index .. tab.active_pane.title
end)

function scheme_for_appearance(appearance)
  if appearance:find 'Dark' then
    return 'Dracula'
  else
    return 'Piatto Light'
  end
end

function window_frame_for_appearance(appearance)
  local window_frame

  if appearance:find 'Dark' then
    -- Dark Mode. Based on Dracula colours.
    window_frame = {
      inactive_titlebar_fg = '#666',
      inactive_titlebar_bg = '#1e1f29',
      active_titlebar_bg = '#1e1f29',
      active_titlebar_fg = '#f8f8f2',
      active_titlebar_border_bottom = '#1e1f29',
      inactive_titlebar_border_bottom = '#1e1f29',
      button_fg = '#f8f8f2',
      button_bg = '#1e1f29',
      button_hover_fg = '#f8f8f2',
      button_hover_bg = '#44475a'
    }
  else
    -- Light Mode. Based on dayfox colours.
    window_frame = {
      inactive_titlebar_fg = '#ccc',
      inactive_titlebar_bg = '#eaeaea',
      active_titlebar_bg = '#eaeaea',
      active_titlebar_fg = '#666',
      active_titlebar_border_bottom = '#eaeaea',
      inactive_titlebar_border_bottom = 'white',
      button_fg = '#666',
      button_bg = '#eaeaea',
      button_hover_fg = '#333',
      button_hover_bg = '#ddd'
    }
  end

  -- Elements common to both colour schemes.
  window_frame.font = wezterm.font { family = 'MesloLGM Nerd Font', weight = 'Regular' }
  window_frame.font_size = 10

  return window_frame
end


return {
  adjust_window_size_when_changing_font_size = false,
  color_scheme = scheme_for_appearance(wezterm.gui.get_appearance()),
  font = wezterm.font 'MesloLGM Nerd Font',
  font_size = 11.0,
  hide_tab_bar_if_only_one_tab = true,
  enable_wayland = true,
  leader = { key = 'a', mods = 'CTRL' },

  -- This makes WezTerm appear almost native on GNOME when combined
  -- with the Rounded Window Corners extension.
  -- However, it does not appear to behaving well with the
  -- Tiling Assistant extension. Does not tile correctly.
  -- window_decorations = "NONE",

  window_padding = {
    left = 20,
    right = 20,
    top = 20,
    bottom = 0,
  },

  -- This is for light mode.
  -- TODO: Also create style for dark mode and use the system setting to change it.
  window_frame = window_frame_for_appearance(wezterm.gui.get_appearance()),

  -- Ditto, these colors are for light mode.
  colors = {
    tab_bar = {
      active_tab = {
        bg_color = '#ddd',
        fg_color = '#666'
      },

      inactive_tab = {
        bg_color = '#eee',
        fg_color = '#ccc'
      },
      inactive_tab_hover = {
        bg_color = '#bbb',
        fg_color = '#555'
      },

      new_tab = {
        bg_color = '#efefef',
        fg_color = '#333'
      },
      new_tab_hover = {
        bg_color = '#bbb',
        fg_color = '#555'
      }
    }
  },

  inactive_pane_hsb = {
    saturation = 0.8,
    brightness = 0.3,
  },

  keys = {
    -- Split panel to the right.
    {
      key = 'r',
      mods = 'CTRL|SHIFT',
      action = wezterm.action.SplitHorizontal { domain = 'CurrentPaneDomain' },
    },
    {
      key = 'd',
      mods = 'CTRL|SHIFT',
      action = wezterm.action.SplitVertical { domain = 'CurrentPaneDomain' },
    },
    {
      key = 'r',
      mods= 'CTRL|SHIFT|SUPER',
      action = wezterm.action.SplitPane {
        direction = 'Right',
        top_level = true
      }
    },
    {
      key = 'd',
      mods= 'CTRL|SHIFT|SUPER',
      action = wezterm.action.SplitPane {
        direction = 'Down',
        top_level = true
      },
    },
    -- Rotate panes --
    -- See https://wezfurlong.org/wezterm/config/lua/keyassignment/RotatePanes.html --
    {
      key = 'LeftArrow',
      mods = 'CTRL|SHIFT|SUPER',
      action = wezterm.action.RotatePanes 'CounterClockwise',
    },
    {
      key = 'RightArrow',
      mods = 'CTRL|SHIFT|SUPER',
      action = wezterm.action.RotatePanes 'Clockwise',
    },
    { key = 'LeftArrow', mods = 'LEADER', action = wezterm.action.AdjustPaneSize { 'Left', 5 } },
    { key = 'DownArrow', mods = 'LEADER', action = wezterm.action.AdjustPaneSize { 'Down', 5 } },
    { key = 'UpArrow', mods = 'LEADER', action = wezterm.action.AdjustPaneSize { 'Up', 5 } },
    { key = 'RightArrow', mods = 'LEADER', action = wezterm.action.AdjustPaneSize { 'Right', 5 } },
    -- Thanks to https://gist.github.com/frabjous/28263aadd401ebca85e693b766537379
    -- ctrl-c either copy or interrupts depending on selection
    {
        key = "c",
        mods = "CTRL",
        action = wezterm.action_callback(function(window, pane)
            local has_selection = (
                window:get_selection_text_for_pane(pane) ~= ""
            )
            if (has_selection) then
                window:perform_action(
                    wezterm.action({
                        CopyTo="ClipboardAndPrimarySelection"
                    }),
                    pane
                )
            -- not implemented yet; don't want it probably
            -- window:perform_action("ClearSelection", pane)
            else
                window:perform_action(
                    wezterm.action({
                        SendKey = { key = "c", mods = "CTRL"}
                    }),
                    pane
                )
            end
        end)
    },
    -- ctrl-v and shift-ctrl-v pastes
    { key = "v", mods = "CTRL", action = wezterm.action({
        PasteFrom = "Clipboard"
    })},
    { key = "v", mods = "CTRL|SHIFT", action = wezterm.action({
        PasteFrom = "Clipboard"
    })},
  }
}