My wezterm config with tmux-like bindings

wezterm.lua

local wezterm = require 'wezterm'
local act = wezterm.action

local config = {}
if wezterm.config_builder then
  config = wezterm.config_builder()
end

config.color_scheme = 'Catppuccin Mocha'
config.colors = {
  tab_bar = {
    -- The background color of the tab bar itself
    background = '#1e1e2e',
  },
}
---[ Tab styling
wezterm.on('format-tab-title', function(tab, tabs, panes, config, hover, max_width)
  local edge_background = '#1e1e2e'
  local background = '#313244'
  local foreground = '#cdd6f4'

  if tab.is_active then
    background = '#cba6f7'
    foreground = '#11111b'
  elseif hover then
    background = '#585b70'
    foreground = '#cdd6f4'
  end

  -- The trick: determine the background color of the NEXT tab.
  -- This allows the curve of the current tab to blend seamlessly
  -- into the background of the tab that follows it.
  local next_background = edge_background
  if tab.tab_index < #tabs - 1 then
    -- Lua arrays are 1-indexed, while tab.tab_index is 0-indexed
    local next_tab = tabs[tab.tab_index + 2]
    if next_tab.is_active then
      next_background = '#cba6f7'
    else
      next_background = '#313244'
    end
  end

  local title = tab.active_pane.title
  if string.len(title) > 20 then
    title = string.sub(title, 1, 17) .. "..."
  end
  title = string.format(' %s ', title)

  local elements = {}

  -- 1. Add a rounded left edge ONLY to the very first tab
  if tab.tab_index == 0 then
    table.insert(elements, { Background = { Color = edge_background } })
    table.insert(elements, { Foreground = { Color = background } })
    table.insert(elements, { Text = '' }) -- U+E0B6
  end

  -- 2. The main body of the tab
  table.insert(elements, { Background = { Color = background } })
  table.insert(elements, { Foreground = { Color = foreground } })
  table.insert(elements, { Text = title })

  -- 3. The right curved edge, which blends into the NEXT tab's background
  table.insert(elements, { Background = { Color = next_background } })
  table.insert(elements, { Foreground = { Color = background } })
  table.insert(elements, { Text = '' }) -- U+E0B4

  return elements
end)

---[ UI & APPEARANCE
config.use_fancy_tab_bar = false
config.tab_bar_at_bottom = true
config.hide_tab_bar_if_only_one_tab = true
config.window_decorations = "NONE"
config.show_new_tab_button_in_tab_bar = false

config.font = wezterm.font_with_fallback {
  { family = "Iosevka Nerd Font Mono", weight = "Medium" },
  "Symbols Nerd Font Mono",
  "icons-in-terminal",
  "Material Icons",
}
config.font_size = 14.0

---[ LEADER KEY
config.leader = { key = "a", mods = "CTRL", timeout_milliseconds = 5000 }

---[ BASE KEYBINDINGS
config.keys = {
  -- Send Ctrl+a to terminal when pressed twice
  { key = "a",  mods = "LEADER|CTRL", action = act.SendString("\x01") },

  -- Doom Mode trigger
  { key = 'w',   mods = 'LEADER', action = act.ActivateKeyTable { name = 'window_mode', one_shot = true } },
  { key = 'Tab', mods = 'LEADER', action = act.ActivateKeyTable { name = 'workspace_mode', one_shot = true } },

  -- Flat binding
  { key = "-",  mods = "LEADER", action = act.SplitVertical { domain = "CurrentPaneDomain" } },
  { key = "\\", mods = "LEADER", action = act.SplitHorizontal { domain = "CurrentPaneDomain" } },
  { key = "s",  mods = "LEADER", action = act.SplitVertical { domain = "CurrentPaneDomain" } },
  { key = "v",  mods = "LEADER", action = act.SplitHorizontal { domain = "CurrentPaneDomain" } },
  { key = "o",  mods = "LEADER", action = act.TogglePaneZoomState },
  { key = "z",  mods = "LEADER", action = act.TogglePaneZoomState },
  { key = "c",  mods = "LEADER", action = act.SpawnTab("CurrentPaneDomain") },
  { key = "n",  mods = "LEADER", action = act.SpawnTab("CurrentPaneDomain") },

  -- Navigation
  { key = "h",  mods = "LEADER", action = act.ActivatePaneDirection("Left") },
  { key = "j",  mods = "LEADER", action = act.ActivatePaneDirection("Down") },
  { key = "k",  mods = "LEADER", action = act.ActivatePaneDirection("Up") },
  { key = "l",  mods = "LEADER", action = act.ActivatePaneDirection("Right") },

  -- Resizing
  { key = "H",  mods = "LEADER|SHIFT", action = act.AdjustPaneSize { "Left", 5 } },
  { key = "J",  mods = "LEADER|SHIFT", action = act.AdjustPaneSize { "Down", 5 } },
  { key = "K",  mods = "LEADER|SHIFT", action = act.AdjustPaneSize { "Up", 5 } },
  { key = "L",  mods = "LEADER|SHIFT", action = act.AdjustPaneSize { "Right", 5 } },

  -- Tab Navigation (1-9)
  { key = "1",  mods = "LEADER", action = act.ActivateTab(0) },
  { key = "2",  mods = "LEADER", action = act.ActivateTab(1) },
  { key = "3",  mods = "LEADER", action = act.ActivateTab(2) },
  { key = "4",  mods = "LEADER", action = act.ActivateTab(3) },
  { key = "5",  mods = "LEADER", action = act.ActivateTab(4) },
  { key = "6",  mods = "LEADER", action = act.ActivateTab(5) },
  { key = "7",  mods = "LEADER", action = act.ActivateTab(6) },
  { key = "8",  mods = "LEADER", action = act.ActivateTab(7) },
  { key = "9",  mods = "LEADER", action = act.ActivateTab(8) },

  -- Closing
  { key = "&",  mods = "LEADER|SHIFT", action = act.CloseCurrentTab { confirm = true } },
  { key = "d",  mods = "LEADER", action = act.CloseCurrentPane { confirm = true } },
  { key = "x",  mods = "LEADER", action = act.CloseCurrentPane { confirm = true } },
}

---[ Key Tables
config.key_tables = {

  -- Triggered by <leader> w
  window_mode = {
    { key = 'v', action = act.SplitHorizontal { domain = 'CurrentPaneDomain' } },
    { key = 's', action = act.SplitVertical { domain = 'CurrentPaneDomain' } },
    { key = 'h', action = act.ActivatePaneDirection('Left') },
    { key = 'j', action = act.ActivatePaneDirection('Down') },
    { key = 'k', action = act.ActivatePaneDirection('Up') },
    { key = 'l', action = act.ActivatePaneDirection('Right') },
    { key = 'q', action = act.CloseCurrentPane { confirm = true } },
    { key = 'c', action = act.CloseCurrentPane { confirm = true } },
    { key = 'H', action = act.AdjustPaneSize { 'Left', 5 } },
    { key = 'J', action = act.AdjustPaneSize { 'Down', 5 } },
    { key = 'K', action = act.AdjustPaneSize { 'Up', 5 } },
    { key = 'L', action = act.AdjustPaneSize { 'Right', 5 } },
    { key = 'Escape', action = 'PopKeyTable' },
  },

  -- Triggered by <leader> Tab
  workspace_mode = {
    { key = 'n', action = act.SpawnTab('CurrentPaneDomain') },
    { key = 'd', action = act.CloseCurrentTab { confirm = true } },
    { key = '[', action = act.ActivateTabRelative(-1) },
    { key = ']', action = act.ActivateTabRelative(1) },
    { key = 'Escape', action = 'PopKeyTable' },
  },
}

return config

Echoing the message above, really good config to start with, thank you.

That should go into official documentation. Plenty of people like me have tmux keybindings hardwired into their brains

Thank you so much for this snippet! Saved me an hour 🙌

allow repeating J H K L when resizing:

	{
		key = "h",
		mods = "LEADER|SHIFT",
		action = wezterm.action.Multiple({
			wezterm.action.AdjustPaneSize({ "Left", 5 }),
			wezterm.action.ActivateKeyTable({ name = "resize_pane", one_shot = false, until_unknown = true }),
		}),
	},
	{
		key = "j",
		mods = "LEADER|SHIFT",
		action = wezterm.action.Multiple({
			wezterm.action.AdjustPaneSize({ "Down", 5 }),
			wezterm.action.ActivateKeyTable({ name = "resize_pane", one_shot = false, until_unknown = true }),
		}),
	},
	{
		key = "k",
		mods = "LEADER|SHIFT",
		action = wezterm.action.Multiple({
			wezterm.action.AdjustPaneSize({ "Up", 5 }),
			wezterm.action.ActivateKeyTable({ name = "resize_pane", one_shot = false, until_unknown = true }),
		}),
	},
	{
		key = "l",
		mods = "LEADER|SHIFT",
		action = wezterm.action.Multiple({
			wezterm.action.AdjustPaneSize({ "Right", 5 }),
			wezterm.action.ActivateKeyTable({ name = "resize_pane", one_shot = false, until_unknown = true }),
		}),
	},

# then 

config.key_tables.resize_pane = {
	{ key = "h",      mods = "SHIFT",          action = wezterm.action.AdjustPaneSize({ "Left", 5 }) },
	{ key = "j",      mods = "SHIFT",          action = wezterm.action.AdjustPaneSize({ "Down", 5 }) },
	{ key = "k",      mods = "SHIFT",          action = wezterm.action.AdjustPaneSize({ "Up", 5 }) },
	{ key = "l",      mods = "SHIFT",          action = wezterm.action.AdjustPaneSize({ "Right", 5 }) },
	{ key = "Escape", action = wezterm.action.PopKeyTable },
}