wezterm/docs/configuration.markdown

title
Configuration

Configuration

wezterm will look for a TOML configuration file in $HOME/.config/wezterm/wezterm.toml, and then in $HOME/.wezterm.toml, stopping at the first file it finds.

Configuration is currently very simple and the format is considered unstable and subject to change. The code for configuration can be found in src/config.rs.

Font Related Configuration

The following options impact how text is rendered:

# The font size, measured in points
font_size = 11

# The DPI to assume, measured in dots-per-inch
# This is not automatically probed!  If you experience blurry text
# or notice slight differences when comparing with other terminal
# emulators, you may wish to tune this value!
dpi = 96

The baseline font is configured via the [[font.font]] section:

[[font.font]]
# The font family name.  The default is "Menlo" on macOS,
# "Consolas" on Windows and "monospace" on X11 based systems.
# "Fira Code" to enjoy ligatures without buying an expensive font!
family = "Operator Mono SSm Lig Medium"
# Whether the font should be a bold variant
# bold = false
# Whether the font should be an italic variant
# italic = false

You may specify rules that apply different font styling based on the attributes of the text rendered in the terminal. Rules are applied in the order that they are specified in the configuration file, stopping with the first matching rule.

# Define a rule that matches when italic text is shown
[[font_rules]]
# If specified, this rule matches when a cell's italic value exactly
# matches this.  If unspecified, the attribute value is irrelevant
# with respect to matching.
italic = true

# Match based on intensity: "Bold", "Normal" and "Half" are supported
# intensity = "Normal"

# Match based on underline: "None", "Single", and "Double" are supported
# underline = "None"

# Match based on the blink attribute: "None", "Slow", "Rapid"
# blink = "None"

# Match based on reverse video
# reverse = false

# Match based on strikethrough
# strikethrough = false

# Match based on the invisible attribute
# invisible = false

  # When the above attributes match, apply this font styling
  [font_rules.font]
  font = [{family = "Operator Mono SSm Lig Medium", italic=true}]

Here's an example from my configuration file:

# Select a fancy italic font for italic text
[[font_rules]]
italic = true
  [font_rules.font]
  font = [{family = "Operator Mono SSm Lig Medium", italic=true}]

# Similarly, a fancy bold+italic font
[[font_rules]]
italic = true
intensity = "Bold"
  [font_rules.font]
  font = [{family = "Operator Mono SSm Lig", italic=true, bold=true}]

# Make regular bold text a different color to make it stand out even more
[[font_rules]]
intensity = "Bold"
  [font_rules.font]
  font = [{family = "Operator Mono SSm", bold=true}]
  foreground="tomato"

# For half-intensity text, use a lighter weight font
[[font_rules]]
intensity = "Half"
  [font_rules.font]
  font=[{family = "Operator Mono SSm Lig Light" }]

Misc configuration

# How many lines of scrollback you want to retain per tab
scrollback_lines = 3500

# If no `prog` is specified on the command line, use this
# instead of running the user's shell.
# The value is the argument array, with the 0th element being
# the executable to run.  The path will be searched to locate
# this if needed.
# For example, to have `wezterm` always run `top` by default,
# you'd use this:
default_prog = ["top"]

# What to set the TERM variable to
term = "xterm-256color"

# Constrains the rate at which output from a child command is
# processed and applied to the terminal model.
# This acts as a brake in the case of a command spewing a
# ton of output and allows for the UI to remain responsive
# so that you can hit CTRL-C to interrupt it if desired.
# The default value is 200,000 bytes/s.
ratelimit_output_bytes_per_second = 200_000

# Constrains the rate at which the multiplexer server will
# unilaterally push data to the client.
# This helps to avoid saturating the link between the client
# and server.
# Each time the screen is updated as a result of the child
# command outputting data (rather than in response to input
# from the client), the server considers whether to push
# the result to the client.
# That decision is throttled by this configuration value
# which has a default value of 10/s
ratelimit_mux_output_pushes_per_second = 10

# Constrain how often the mux server scans the terminal
# model to compute a diff to send to the mux client.
# The default value is 100/s
ratelimit_mux_output_scans_per_second = 100

Shortcut / Key Binding Assignments

The default key bindings are:

Modifiers	Key	Action
SUPER	c	Copy
SUPER	v	Paste
`CTRL	SHIFT`	c
`CTRL	SHIFT`	v
SHIFT	Insert	Paste
SUPER	m	Hide
SUPER	n	SpawnWindow
`CTRL	SHIFT`	n
ALT	Enter	ToggleFullScreen
SUPER	-	DecreaseFontSize
CTRL	-	DecreaseFontSize
SUPER	=	IncreaseFontSize
CTRL	=	IncreaseFontSize
SUPER	0	ResetFontSize
CTRL	0	ResetFontSize
SUPER	t	SpawnTabInCurrentTabDomain
`CTRL	SHIFT`	t
`SUPER	SHIFT`	T
SUPER	w	CloseCurrentTab
SUPER	1	ActivateTab(0)
SUPER	2	ActivateTab(1)
SUPER	3	ActivateTab(2)
SUPER	4	ActivateTab(3)
SUPER	5	ActivateTab(4)
SUPER	6	ActivateTab(5)
SUPER	7	ActivateTab(6)
SUPER	8	ActivateTab(7)
SUPER	9	ActivateTab(8)
`CTRL	SHIFT`	w
`CTRL	SHIFT`	1
`CTRL	SHIFT`	2
`CTRL	SHIFT`	3
`CTRL	SHIFT`	4
`CTRL	SHIFT`	5
`CTRL	SHIFT`	6
`CTRL	SHIFT`	7
`CTRL	SHIFT`	8
`CTRL	SHIFT`	9
SUPER|SHIFT	[	ActivateTabRelative(-1)
SUPER|SHIFT	]	ActivateTabRelative(1)

These can be overridden using the keys section in your ~/.wezterm.toml config file. For example, you can disable a default assignment like this:

# Turn off the default CMD-m Hide action
[[keys]]
key = "m"
mods = "CMD"
action = "Nop"

The key value can be one of the following keycode identifiers. Note that not all of these are meaningful on all platforms:

Hyper, Super, Meta, Cancel, Backspace, Tab, Clear, Enter, Shift, Escape, LeftShift, RightShift, Control, LeftControl, RightControl, Alt, LeftAlt, RightAlt, Menu, LeftMenu, RightMenu, Pause, CapsLock, PageUp, PageDown, End, Home, LeftArrow, RightArrow, UpArrow, DownArrow, Select, Print, Execute, PrintScreen, Insert, Delete, Help, LeftWindows, RightWindows, Applications, Sleep, Numpad0, Numpad1, Numpad2, Numpad3, Numpad4, Numpad5, Numpad6, Numpad7, Numpad8, Numpad9, Multiply, Add, Separator, Subtract, Decimal, Divide, NumLock, ScrollLock, BrowserBack, BrowserForward, BrowserRefresh, BrowserStop, BrowserSearch, BrowserFavorites, BrowserHome, VolumeMute, VolumeDown, VolumeUp, MediaNextTrack, MediaPrevTrack, MediaStop, MediaPlayPause, ApplicationLeftArrow, ApplicationRightArrow, ApplicationUpArrow, ApplicationDownArrow.

Alternatively, a single unicode character can be specified to indicate pressing the corresponding key.

Possible Modifier labels are:

• SUPER, CMD, WIN - these are all equivalent: on macOS the Command key, on Windows the Windows key, on Linux this can also be the Super or Hyper key. Left and right are equivalent.
• SHIFT - The shift key. Left and right are equivalent.
• ALT, OPT, META - these are all equivalent: on macOS the Option key, on other systems the Alt or Meta key. Left and right are equivalent.

You can combine modifiers using the | symbol (eg: "CMD|CTRL").

Possible actions are listed below. Some actions require a parameter that is specified via the arg key; see examples below.

Name	Effect
SpawnTab	Create a new local tab in the current window
SpawnTabInCurrentTabDomain	Create a new tab in the current window. The tab will be spawned in the same domain as the currently active tab
SpawnTabInDomain	Create a new tab in the current window. The tab will be spawned in the domain specified by the arg value
SpawnWindow	Create a new window
ToggleFullScreen	Toggles full screen mode for current window
Paste	Paste the clipboard to the current tab
ActivateTabRelative	Activate a tab relative to the current tab. The arg value specifies an offset. eg: -1 activates the tab to the left of the current tab, while 1 activates the tab to the right.
ActivateTab	Activate the tab specified by the arg value. eg: 0 activates the leftmost tab, while 1 activates the second tab from the left, and so on.
IncreaseFontSize	Increases the font size of the current window by 10%
DecreaseFontSize	Decreases the font size of the current window by 10%
ResetFontSize	Reset the font size for the current window to the value in your configuration
SendString	Sends the string specified by the arg value to the terminal in the current tab, as though that text were literally typed into the terminal.
Nop	Does nothing. This is useful to disable a default key assignment.
Hide	Hides the current window
Show	Shows the current window
CloseCurrentTab	Equivalent to clicking the x on the window title bar to close it: Closes the current tab. If that was the last tab, closes that window. If that was the last window, wezterm terminates.

Example:

# Turn off the default CMD-m Hide action
[[keys]]
key = "m"
mods = "CMD"
action = "Nop"

# Macro for sending in some boiler plate.  This types `wtf!?` each
# time CMD+SHIFT+W is pressed
[[keys]]
key = "W"
mods = "CMD|SHIFT"
action = "SendString"
arg = "wtf!?"

# CTRL+ALT+0 activates the leftmost tab
[[keys]]
key = "0"
mods = "CTRL|ALT"
action = "ActivateTab"
# the tab number
arg = "0"

# CMD+y spawns a new tab in Domain 1
[[keys]]
key = "y"
mods = "CMD"
action = "SpawnTabInDomain"
# the domain ID
arg = "1"

Colors

You can configure colors with a section like this. In addition to specifying SVG/CSS3 color names, you can use #RRGGBB to specify a color code using the usual hex notation; eg: #000000 is equivalent to black:

[colors]
foreground = "silver"
background = "black"
cursor_bg = "springgreen"
ansi = ["black", "maroon", "green", "olive", "navy", "purple", "teal", "silver"]
brights = ["grey", "red", "lime", "yellow", "blue", "fuchsia", "aqua", "white"]

You can find a variety of color schemes here. There are two ways to use them with wezterm:

• The wezterm directory contains configuration snippets that you can copy and paste into your wezterm.toml file to set the default configuration.
• The dynamic-colors directory contains shell scripts that can change the color scheme immediately on the fly. This is super convenient for trying out color schemes, and can be used in your own scripts to alter the terminal appearance programmatically:

$ git clone https://github.com/mbadolato/iTerm2-Color-Schemes.git
$ cd iTerm2-Color-Schemes/dynamic-colors
$ for scheme in *.sh ; do ; echo $scheme ; \
   bash "$scheme" ; ../tools/screenshotTable.sh; sleep 0.5; done