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This allows scripts to fetch their own dependencies via nix-shell. For
instance, here is a Haskell script that, when executed, pulls in GHC
and the HTTP package:
#! /usr/bin/env nix-shell
#! nix-shell -i runghc -p haskellPackages.ghc haskellPackages.HTTP
import Network.HTTP
main = do
resp <- Network.HTTP.simpleHTTP (getRequest "http://nixos.org/")
body <- getResponseBody resp
print (take 100 body)
Or a Perl script that pulls in Perl and some CPAN packages:
#! /usr/bin/env nix-shell
#! nix-shell -i perl -p perl perlPackages.HTMLTokeParserSimple perlPackages.LWP
use HTML::TokeParser::Simple;
my $p = HTML::TokeParser::Simple->new(url => 'http://nixos.org/');
while (my $token = $p->get_tag("a")) {
my $href = $token->get_attr("href");
print "$href\n" if $href;
}
Note that the options to nix-shell must be given on a separate line
that starts with the magic string ‘#! nix-shell’. This is because
‘env’ does not allow passing arguments to an interpreter directly.
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|---|---|---|
| .. | ||
| build-remote.pl.in | ||
| copy-from-other-stores.pl.in | ||
| download-from-binary-cache.pl.in | ||
| download-using-manifests.pl.in | ||
| find-runtime-roots.pl.in | ||
| install-nix-from-closure.sh | ||
| local.mk | ||
| nix-build.in | ||
| nix-channel.in | ||
| nix-collect-garbage.in | ||
| nix-copy-closure.in | ||
| nix-generate-patches.in | ||
| nix-http-export.cgi.in | ||
| nix-install-package.in | ||
| nix-prefetch-url.in | ||
| nix-profile.sh.in | ||
| nix-pull.in | ||
| nix-push.in | ||
| nix-reduce-build.in | ||
| show-duplication.pl | ||