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6d6c68c0d2
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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|---|---|---|
| .. | ||
| lang | ||
| add.sh | ||
| build-hook.hook.sh | ||
| build-hook.nix.in | ||
| build-hook.sh | ||
| check-refs.nix.in | ||
| check-refs.sh | ||
| common.sh.in | ||
| dependencies.builder0.sh | ||
| dependencies.builder1.sh | ||
| dependencies.builder2.sh | ||
| dependencies.nix.in | ||
| dependencies.sh | ||
| dummy | ||
| fallback.sh | ||
| filter-source.nix.in | ||
| filter-source.sh | ||
| fixed.builder1.sh | ||
| fixed.builder2.sh | ||
| fixed.nix.in | ||
| fixed.sh | ||
| gc-concurrent.builder.sh | ||
| gc-concurrent.nix.in | ||
| gc-concurrent.sh | ||
| gc-concurrent2.builder.sh | ||
| gc-concurrent2.nix.in | ||
| gc-runtime.nix.in | ||
| gc-runtime.sh | ||
| gc.sh | ||
| hash-check.nix | ||
| hash.sh | ||
| init.sh | ||
| install-package.sh | ||
| lang.sh | ||
| locking.builder.sh | ||
| locking.nix.in | ||
| locking.sh | ||
| logging.sh | ||
| Makefile.am | ||
| misc.sh | ||
| nix-build.sh | ||
| nix-pull.sh | ||
| nix-push.sh | ||
| parallel.builder.sh | ||
| parallel.nix.in | ||
| parallel.sh | ||
| referrers.sh | ||
| remote-store.sh | ||
| simple.builder.sh | ||
| simple.nix.in | ||
| simple.sh | ||
| substituter.sh | ||
| substituter2.sh | ||
| substitutes.sh | ||
| substitutes2.sh | ||
| user-envs.builder.sh | ||
| user-envs.nix.in | ||
| user-envs.sh | ||
| verify.sh | ||