Nix Language: Tips & Tricks: Difference between revisions
imported>Mateusauler m To wrtie text to a file by redirecting the output of a shell utility, `echo` should be used, instead of `cat`. |
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{{Merge|Nix (language)}} | |||
== Finding the definition of a function or package == | == Finding the definition of a function or package == | ||
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</pre> | </pre> | ||
This doesn't work for non-functions or builtin functions, which show <code>«primop»</code>. It will always find the actual lambda, not an attribute that reexports a partial application, for example. | This doesn't work for non-functions or builtin functions, which show <code>«primop»</code>. It will always find the actual lambda, not an attribute that reexports a partial application, for example. | ||
Also in the REPL, you may use the <code>:edit</code> command (or its abbreviation <code>:e</code>) on an expression to open your editor (detected from the <code>$EDITOR</code> environment variable) at the location where an attribute was defined. | |||
<syntaxhighlight lang="bash"> | |||
$ nix repl --expr '{ pkgs = import <nixpkgs> { }; }' | |||
nix-repl> :e pkgs.lib.strings.makeBinPath | |||
</syntaxhighlight> | |||
The position information is not always perfectly accurate, but the above sequence of commands ''should'' open your editor to somewhere close to https://github.com/NixOS/nixpkgs/blob/b6ed1c5ee1470faf835024587c25fafb03693cbe/lib/strings.nix#L228. | |||
== Convert a string to an (<code>import</code>-able) path == | == Convert a string to an (<code>import</code>-able) path == | ||
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== Relevant pages == | == Relevant pages == | ||
* [[Overview of the Nix | * [[Overview of the Nix Language]] | ||
* [[Editor Modes for Nix Files]] | * [[Editor Modes for Nix Files]] | ||
* [[Nix Expression Language: Learning resources|Learning resources]] | * [[Nix Expression Language: Learning resources|Learning resources]] | ||