50 lines
1.9 KiB
Markdown
50 lines
1.9 KiB
Markdown
# Fish {#sec-fish}
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Fish is a "smart and user-friendly command line shell" with support for plugins.
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## Vendor Fish scripts {#sec-fish-vendor}
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Any package may ship its own Fish completions, configuration snippets, and
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functions. Those should be installed to
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`$out/share/fish/vendor_{completions,conf,functions}.d` respectively.
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When the `programs.fish.enable` and
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`programs.fish.vendor.{completions,config,functions}.enable` options from the
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NixOS Fish module are set to true, those paths are symlinked in the current
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system environment and automatically loaded by Fish.
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## Packaging Fish plugins {#sec-fish-plugins-pkg}
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While packages providing standalone executables belong to the top level,
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packages which have the sole purpose of extending Fish belong to the
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`fishPlugins` scope and should be registered in
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`pkgs/shells/fish/plugins/default.nix`.
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The `buildFishPlugin` utility function can be used to automatically copy Fish
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scripts from `$src/{completions,conf,conf.d,functions}` to the standard vendor
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installation paths. It also sets up the test environment so that the optional
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`checkPhase` is executed in a Fish shell with other already packaged plugins
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and package-local Fish functions specified in `checkPlugins` and
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`checkFunctionDirs` respectively.
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See `pkgs/shells/fish/plugins/pure.nix` for an example of Fish plugin package
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using `buildFishPlugin` and running unit tests with the `fishtape` test runner.
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## Fish wrapper {#sec-fish-wrapper}
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The `wrapFish` package is a wrapper around Fish which can be used to create
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Fish shells initialised with some plugins as well as completions, configuration
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snippets and functions sourced from the given paths. This provides a convenient
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way to test Fish plugins and scripts without having to alter the environment.
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```nix
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wrapFish {
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pluginPkgs = with fishPlugins; [ pure foreign-env ];
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completionDirs = [];
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functionDirs = [];
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confDirs = [ "/path/to/some/fish/init/dir/" ];
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}
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```
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