⚡️Znap!

Znap is a fast, light-weight set of tools to ease the use of Zsh plugins & Git repos and reduce your shell's startup time.

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Requirements

Tested with:

• Zsh 5.8.1
• Git 2.39.1

Installation

Put this in your .zshrc file (replacing ~/Repos with wherever you want to keep your Zsh plugins and/or Git repos):

# Download Znap, if it's not there yet.
[[ -r ~/Repos/znap/znap.zsh ]] ||
    git clone --depth 1 -- \
        https://github.com/marlonrichert/zsh-snap.git ~/Repos/znap
source ~/Repos/znap/znap.zsh  # Start Znap

Then restart your shell.

To uninstall, simply remove the above from your .zshrc file and remove Znap's repo.

Znap will automatically manage the repos found in its parent directory. To change the directory it should manage, add the following to your .zshrc file:

zstyle ':znap:*' repos-dir <path>

Updating

To update Znap and all of your plugins/repos simultaneously, run

% znap pull

Note, that if you told Znap not to manage its parent directory (see the previous section), then it will not update itself with this. You will have to manually cd to its directory and run git pull.

If there are repos that you do not want to be included by znap pull, add the following to your .zshrc file:

zstyle ':znap:pull:*' exclude <repo> ...

To run znap pull on specific repos only, including ones you have set to be excluded, pass them as an arguments:

% znap pull <repo> ...

.zshrc optimization

Using Znap to optimize your Zsh config can be as simple as this:

[[ -r ~/Repos/znap/znap.zsh ]] ||
    git clone --depth 1 -- https://github.com/marlonrichert/zsh-snap.git ~/Repos/znap

# `znap prompt` makes your prompt visible in just 15-40ms!
znap prompt sindresorhus/pure

# `znap source` starts plugins.
znap source marlonrichert/zsh-autocomplete

# `znap eval` makes evaluating generated command output up to 10 times faster.
znap eval iterm2 'curl -fsSL https://iterm2.com/shell_integration/zsh'

# `znap function` lets you lazy-load features you don't always need.
znap function _pyenv pyenv "znap eval pyenv 'pyenv init - --no-rehash'"
compctl -K    _pyenv pyenv

# `znap install` adds new commands and completions.
znap install aureliojargas/clitest zsh-users/zsh-completions

For more examples of what Znap can do for your dotfiles, please see the included .zshrc file.

Additionaly, Znap makes it so that you actually need to have less in your .zshrc file, by automating several tasks for you.

Faster eval

Use znap eval ... <command> to cache the output of <command>, compile it, and then source it (instead of eval it):

znal eval <name> '<command>'

This can be up 10 times faster than a regular eval "$( <command> )" statement! If you pass a repo as the first argument, then Znap will eval the command output inside the given repo and will invalidate the cache whenever the repo is update. Otherwise, the cache will be invalidated whenever <command> changes. Caches are stored in ${XDG_CACHE_HOME:-$HOME/.cache}/zsh-snap/eval.

Automatic compinit and bashcompinit

Note that the above example does not include any call to complist, compinit, or bashcompinit in the .zshrc file. That is because Znap will run these for you as needed.

Znap also regenerates your comp dump file automatically whenever you update a repo, install a repo, or change your .zshrc file.

If necessary, you can let Znap pass arguments to compinit as follows:

zstyle '*:compinit' arguments -D -i -u -C -w

Asynchronous compilation

Znap compiles your scripts and functions in the background. This way, your shell will start up even faster next time!

Should you not want this feature, you can disable it with

zstyle ':znap:*' auto-compile no

In any case, you can compile sources manually at any time with znap compile [ <dir> | <file> ] ....

Automatic git maintenance

When using git 2.31.0 or newer, Znap automatically enables git maintenance in each repo that it manages. This automatically optimizes your repos in the background, so that your git and znap commands will run faster.

To selectively disable this feature, add

zstyle ':znap:*:<glob pattern>' git-maintenance off

to your .zshrc file. Next time you run znap pull, git maintenance will then be disabled for each repo whose name matches <glob pattern>.

Use * as your glob pattern to opt out of this feature completely.

Command-Line Usage

Znap also makes life on the command line easier. For a full list of available commands, run

% znap

For more help on a particular command, run

% znap help <command>

Exhaustive tab completion is available, too. For examples of the most important command-line features, see below.

Note:

• The examples below you should run on the command line, not add to your .zshrc file!
• % represents the prompt. You shouldn't type that part. 🙂

Check Git status of all repos

To check the Git status of all repos managed by Znap, run

% znap status

If there are repos that you do not want to be included by znap status, add the following to your .zshrc file:

zstyle ':znap:status:*' exclude <repo> ...

To run znap status on specific repos only, including ones you have set to be excluded, pass them as an arguments:

% znap status <repo> ...

Removing repos

To remove one or more repos, use znap uninstall:

% znap uninstall asdf-vm/asdf ohmyzsh/ohmyzsh

Install generated functions

Some commands generate output that should be loaded as a function. You can install these generated functions with znap fpath <function> '<command>'. For example:

% znap fpath _kubectl 'kubectl completion  zsh'
% znap fpath _rustup  'rustup  completions zsh'
% znap fpath _cargo   'rustup  completions zsh cargo'

This will save them to ${XDG_DATA_HOME:-$HOME/.local/share}/zsh/site-functions.

Named dirs

Znap makes all of the repos it manages available as named directories:

% cd ~[zsh-snap] # `cd` to a repo
% ls ~[asdf]/completions    # `ls` a subdir in a repo

Author

© 2020-2021 Marlon Richert

License

This project is licensed under the MIT License. See the LICENSE file for details.