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introduce lookup paths as a distinct language construct

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so far they did not really have a name, and were at best referred to as
"angle bracket syntax".
This commit is contained in:
Valentin Gagarin 2023-10-07 03:10:20 +02:00
parent 61720d0035
commit f00a5eb11b
4 changed files with 34 additions and 9 deletions
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27
doc/manual/src/language/constructs/lookup-path.md Normal file
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# Lookup path
> **Syntax**
>
> *lookup-path* = `<` *identifier* [ `/` *identifier* `]`... `>`
A lookup path is an identifier with an optional path suffix that resolves to a [path value](@docroot@/language/values.md#type-path) if the identifier matches a search path entry.
The value of a lookup path is determined by [`builtins.nixPath`](@docroot@/language/builtin-constants.md#builtins-nixPath).
See [`builtins.findFile`](@docroot@/language/builtins.md#builtins-findFile) for details on lookup path resolution.
> **Example**
>
> ```nix
> <nixpkgs>
>```
>
> /nix/var/nix/profiles/per-user/root/channels/nixpkgs
> **Example**
>
> ```nix
> <nixpkgs/nixos>
>```
>
> /nix/var/nix/profiles/per-user/root/channels/nixpkgs/nixos