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doc: minimize mentions of nix-env -i without -A in nixpkgs manual

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Guillaume Girol 2021-11-08 12:00:00 +00:00
parent c935f5e0ad
commit a15fbab8e9
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12
doc/languages-frameworks/perl.section.md
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@ -58,13 +58,7 @@ in `all-packages.nix`. You can test building a Perl package as follows:
$ nix-build -A perlPackages.ClassC3
```
`buildPerlPackage` adds `perl-` to the start of the name attribute, so the package above is actually called `perl-Class-C3-0.21`. So to install it, you can say:
```ShellSession
$ nix-env -i perl-Class-C3
```
(Of course you can also install using the attribute name: `nix-env -i -A perlPackages.ClassC3`.)
To install it with `nix-env` instead: `nix-env -f. -iA perlPackages.ClassC3`.
So what does `buildPerlPackage` do? It does the following:
@ -135,9 +129,11 @@ This will remove the `-I` flags from the shebang line, rewrite them in the `use
Nix expressions for Perl packages can be generated (almost) automatically from CPAN. This is done by the program `nix-generate-from-cpan`, which can be installed as follows:
```ShellSession
$ nix-env -i nix-generate-from-cpan
$ nix-env -f "<nixpkgs>" -iA nix-generate-from-cpan
```
Substitute `<nixpkgs>` by the path of a nixpkgs clone to use the latest version.
This program takes a Perl module name, looks it up on CPAN, fetches and unpacks the corresponding package, and prints a Nix expression on standard output. For example:
```ShellSession