Wez's Terminal

A terminal emulator implemented in Rust.

Quickstart

Install rustup to get the nightly rust compiler installed on your system. https://www.rust-lang.org/en-US/install.html
Build in release mode: cargo build --release
Run it via either cargo run --release or target/release/wezterm

You will need a collection of support libraries; important to note is that your harfbuzz library must have support for hb_ft_font_create_referenced; older linux distributions don't have this!

$ sudo apt-get install -y libxcb-icccm4-dev libxcb-ewmh-dev \
    libxcb-image0-dev libxcb-keysyms1-dev libharfbuzz-dev \
    libfontconfig1-dev libfreetype6-dev

What?

Here's what I'm shooting for:

A terminal escape sequence parser
A model of a terminal screen + scrollback that is OS independent
Textual and GUI rendering of the model
A differential protocol for the model

This would manifest as a common core that could run as both a textual terminal multiplexer and a gui terminal emulator, where the GUI part could automatically provide a native UI around the remotely multiplexed terminal session.

Status / Features

These are in the done/doing soon category:

Runs on Linux with XCB
Scrollback (use mouse wheel and Shift Page{Up|Down})
True Color support
Color Emoji and font fallback
Paste selection via Shift-Insert (bracketed paste is supported!)
SGR style mouse reporting (works in vim and tmux)
xterm style selection of text with mouse
Render underline, italic, bold, strikethrough
Configuration file to specify fonts and colors (in progress)
Command line argument parsing instead of launching user shell
Hyperlinks see: https://gist.github.com/egmontkob/eb114294efbcd5adb1944c9f3cb5feda

There's a good number of terminal escape sequences that are not yet implemented and that will get fleshed out as the applications I use uncover them. Similarly for key mappings.

Things that I'd like to see happen and that have no immediate priority (contributions to get closer to these are welcomed!)

Runs on macOS
Sixel / iTerm2 graphics protocol support
Tabs
Textual renderer. Think tmux or screen.
Runs on Linux with Wayland (use XWayland for now)
Runs on Windows

Configuration

wezterm will look for a TOML configuration file in $HOME/.config/wezterm/wezterm.toml, and then in $HOME/.wezterm.toml.

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.

I use the following in my ~/.wezterm.toml:

font_size = 10
font = { fontconfig_pattern = "Operator Mono SSm Lig Medium" }
# How many lines of scrollback to retain
scrollback_lines = 3500

[[font_rules]]
italic = true
font = { fontconfig_pattern = "Operator Mono SSm Lig Medium:style=Italic" }

[[font_rules]]
italic = true
intensity = "Bold"
font = { fontconfig_pattern = "Operator Mono SSm Lig:style=Italic:weight=bold" }

[[font_rules]]
intensity = "Bold"
  [font_rules.font]
  fontconfig_pattern= "Operator Mono SSm:weight=bold"
  # if you liked xterm's `boldColor` setting, this is how you do it in wezterm,
  # but you can apply it to any set of matching attributes!
  foreground = "tomato"

[[font_rules]]
intensity = "Half"
font = { fontconfig_pattern = "Operator Mono SSm Lig Light" }

The default configuration will attempt to use whichever font is returned from fontconfig when monospace is requested.

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

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