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This work started because we wanted to be able to simply say "monospace" on Linux and have it give us some sort of font. The config format for fonts changed to accomodate this new paradigm. As a result, italic and bold can have different families from the normal (roman) face. The fontconfig based font resolution probably works a lot better than the CoreText version at this point. With CoreText, we simply iterate over fonts and check it they match the requested properties. What's worse is that the CoreText version requires a valid family. With fontconfig, it will just provide the closest matching thing and use it (unless a specific style is requested). |
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| LICENSE-APACHE | ||
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Alacritty
Alacritty the fastest terminal emulator in existence. Using the GPU for rendering enables optimizations that simply aren't possible in other emulators. Alacritty currently supports macOS and Linux, and Windows support is planned before the 1.0 release.
About
Alacritty is focused on simplicity and performance. The performance goal means
it should be faster than any other terminal emulator available. The simplicity
goal means that it doesn't have many features like tabs or scroll back as in
other terminals. Instead, it is expected that users of Alacritty make use of a
terminal multiplexer such as tmux.
Installation
The only supported installation method at this time is from source. Proper installers will be added prior to the 1.0 release of Alacritty. This section will walk you through how to build from source on both macOS and Ubuntu.
Prerequisites
-
Install
rustup.rs -
Clone the source code:
git clone https://github.com/jwilm/alacritty cd alacritty -
Make sure you have the right Rust compiler installed. Alacritty is currently pinned to a certain Rust nightly, and the compiler/nightly dependencies are updated as needed. To install the correct compiler, run:
rustup override set $(cat rustc-version)
Additional Linux Prerequisites
Ubuntu
On Ubuntu, you need a few extra libraries to build Alacritty. Here's an apt
command that should install all of them. If something is still found to be
missing, please open an issue.
apt-get install cmake libfreetype6-dev libfontconfig1-dev xclip
Other
If you build Alacritty on another Linux distribution, we would love some help filling in this section of the README.
Additional macOS Prerequisites
It's possible cmake is needed on macOS to build Alacritty. If someone can
verify this and make a PR clarifying either way, it would be greatly
appreciated!
Building
Once all the prerequisites are installed, compiling Alacritty should be easy:
cargo build --release
If all goes well, this should place a binary at target/release/alacritty.
BEFORE YOU RUN IT: Install the config file as described below; otherwise,
many things (such as arrow keys) would not work.
Configuration
Although it's possible the default configuration would work on your system,
you'll probably end up wanting to customize it anyhow. There is an
alacritty.yml at the git repository root. Copy this to either
$HOME/.alacritty.yml or $HOME/.config/alacritty.yml and run Alacritty.
Many configuration options will take effect immediately upon saving changes to
the config file. The only exception is the font and dpi section which
requires Alacritty to be restarted. For further explanation of the config file,
please consult the comments in the default config file.
Issues (known, unknown, feature requests, etc)
If you run into a problem with Alacritty, please file an issue. If you've got a
feature request, feel free to ask about it. Keep in mind that Alacritty is very
much not looking to be a feature-rich terminal emulator with all sorts of bells
and widgets. It's primarily a cross-platform, blazing fast tmux renderer that
Just Works.
FAQ
- Is it really the fastest terminal emulator? In the terminals I've benchmarked against, alacritty is either faster, WAY faster, or at least neutral. There are no benchmarks in which I've found Alacritty to be slower.
- It's not fast! Why? There's a known bug affecting some versions of Mesa/libxcb where calls to glClear take an insanely long time. If it's not that, there's probably another bug. I'd be happy to look at the issue if you can provide some profiling information (wall time and otherwise).
- macOS + tmux + vim is slow! I thought this was supposed to be fast! This
appears to be an issue outside of terminal emulators; either macOS has an IPC
performance issue, or either tmux or vim (or both) have a bug. This same issue
can be seen in
iTerm2andTerminal.app. I've found that if tmux is running on another machine which is connected to Alacritty via SSH, this issue disappears. Actual throughput and rendering performance are still better in Alacritty. - Is wayland supported? Not yet. Alacritty is currently on a fork of glutin that needs some updates to work with Wayland.
- When will Windows support be available? When someone has time to work on it. Contributors would be welcomed :).
- My arrow keys don't work Did you install the default config file?
License
Alacritty is released under the Apache License, Version 2.0.