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single quotes. Example (from NixOS):
job = ''
start on network-interfaces
start script
rm -f /var/run/opengl-driver
${if videoDriver == "nvidia"
then "ln -sf ${nvidiaDrivers} /var/run/opengl-driver"
else if cfg.driSupport
then "ln -sf ${mesa} /var/run/opengl-driver"
else ""
}
rm -f /var/log/slim.log
end script
'';
This style has two big advantages:
- \, ' and " aren't special, only '' and ${. So you get a lot less
escaping in shell scripts / configuration files in Nixpkgs/NixOS.
The delimiter '' is rare in scripts (and can usually be written as
""). ${ is also fairly rare.
Other delimiters such as <<...>>, {{...}} and <|...|> were also
considered but this one appears to have the fewest drawbacks
(thanks Martin).
- Indentation is intelligently stripped so that multi-line strings
can follow the nesting structure of the containing Nix
expression. E.g. in the example above 6 spaces are stripped from
the start of each line. This prevents unnecessary indentation in
generated files (which sometimes even breaks things).
See tests/lang/eval-okay-ind-string.nix for some examples.
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|---|---|---|
| .. | ||
| figures | ||
| bugs.xml | ||
| build-farm.xml | ||
| builtins.xml | ||
| conf-file.xml | ||
| env-common.xml | ||
| glossary.xml | ||
| installation.xml | ||
| introduction.xml | ||
| Makefile.am | ||
| manual.xml | ||
| nix-build.xml | ||
| nix-channel.xml | ||
| nix-collect-garbage.xml | ||
| nix-copy-closure.xml | ||
| nix-env.xml | ||
| nix-hash.xml | ||
| nix-install-package.xml | ||
| nix-instantiate.xml | ||
| nix-lang-ref.xml | ||
| nix-pack-closure.xml | ||
| nix-prefetch-url.xml | ||
| nix-pull.xml | ||
| nix-push.xml | ||
| nix-store.xml | ||
| nix-unpack-closure.xml | ||
| opt-common-syn.xml | ||
| opt-common.xml | ||
| opt-inst-syn.xml | ||
| package-management.xml | ||
| quick-start.xml | ||
| quote-literals.xsl | ||
| release-notes.xml | ||
| schemas.xml | ||
| style.css | ||
| troubleshooting.xml | ||
| writing-nix-expressions.xml | ||