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54 lines
1.3 KiB
Markdown
54 lines
1.3 KiB
Markdown
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---
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synopsis: "`nix-repl`'s `:doc` shows documentation comments"
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significance: significant
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issues:
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- 3904
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- 10771
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prs:
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- 1652
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- 9054
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- 11072
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---
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`nix repl` has a `:doc` command that previously only rendered documentation for internally defined functions.
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This feature has been extended to also render function documentation comments, in accordance with [RFC 145].
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Example:
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```
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nix-repl> :doc lib.toFunction
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Function toFunction
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… defined at /home/user/h/nixpkgs/lib/trivial.nix:1072:5
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Turns any non-callable values into constant functions. Returns
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callable values as is.
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Inputs
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v
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: Any value
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Examples
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:::{.example}
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## lib.trivial.toFunction usage example
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| nix-repl> lib.toFunction 1 2
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| 1
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| nix-repl> lib.toFunction (x: x + 1) 2
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| 3
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:::
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```
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Known limitations:
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- It currently only works for functions. We plan to extend this to attributes, which may contain arbitrary values.
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- Some extensions to markdown are not yet supported, as you can see in the example above.
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We'd like to acknowledge Yingchi Long for proposing a proof of concept for this functionality in [#9054](https://github.com/NixOS/nix/pull/9054), as well as @sternenseemann and Johannes Kirschbauer for their contributions, proposals, and their work on [RFC 145].
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[RFC 145]: https://github.com/NixOS/rfcs/pull/145
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