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104 lines
2.7 KiB
Markdown
104 lines
2.7 KiB
Markdown
nix-repl
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========
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`nix-repl` is a simple read–eval–print loop (REPL) for the Nix package
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manager.
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Installation
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------------
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Assuming you have Nix installed, just do
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$ git clone https://github.com/edolstra/nix-repl.git
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$ cd nix-repl
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$ nix-env -f . -i nix-repl
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Example
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-------
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Here is a typical `nix-repl` session:
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$ nix-repl
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Welcome to Nix version 1.6pre3215_2c1ecf8. Type :? for help.
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nix-repl> 3 * 4
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12
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nix-repl> :l <nixpkgs>
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Added 3337 variables.
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nix-repl> lib.range 1 5
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[ 1 2 3 4 5 ]
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nix-repl> :a lib
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Added 299 variables.
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nix-repl> range 1 5
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[ 1 2 3 4 5 ]
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nix-repl> xs = range 1 5
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nix-repl> map (x: x * x) xs
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[ 1 4 9 16 25 ]
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nix-repl> :l <nixos>
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Added 7 variables.
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nix-repl> config.services.dhcpd
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{ configFile = null; enable = false; extraConfig = ""; interfaces = [ ... ]; machines = [ ... ]; }
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nix-repl> :p config.services.dhcpd
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{ configFile = null; enable = false; extraConfig = ""; interfaces = [ "eth0" ]; machines = [ ]; }
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nix-repl> config.fileSystems
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{ "/" = { ... }; "/boot" = { ... }; }
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nix-repl> mapAttrsToList (n: v: v.device) config.fileSystems
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[ "/dev/disk/by-label/nixos" "/dev/disk/by-label/boot" ]
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nix-repl> :b libjson
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these derivations will be built:
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/nix/store/h910xqb36pysxcxkayb1zkr1zcvvk1zy-libjson_7.6.1.zip.drv
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/nix/store/iv0rdx08di0fg704zyxklkvdz6i96lm8-libjson-7.6.1.drv
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...
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this derivation produced the following outputs:
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out -> /nix/store/ys6bvgfia81rjwqxjlgkwnx6jhsml8h9-libjson-7.6.1
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nix-repl> :t makeFontsConf
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a function
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nix-repl> :b makeFontsConf { fontDirectories = [ "${freefont_ttf}/share/fonts/truetype" ]; }
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...
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this derivation produced the following outputs:
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out -> /nix/store/jkw848xj0gkbhmvxi0hwpnhzn2716v3c-fonts.conf
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nix-repl> :s pan
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# Builds dependencies of the ‘pan’ derivation, then starts a shell
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# in which the environment variables of the derivation are set
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[nix-shell:/tmp/nix-repl]$ echo $src
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/nix/store/0ibx15r02nnkwiclmfbpzrzjm2y204fh-pan-0.139.tar.bz2
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[nix-shell:/tmp/nix-repl]$ exit
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nix-repl>
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Tab completion works on variables in scope and on attribute sets. For
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example:
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$ nix-repl '<nixpkgs>' '<nixos>'
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Welcome to Nix version 1.6pre3215_2c1ecf8. Type :? for help.
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nix-repl> thunder<TAB> => thunderbird
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nix-repl> <TAB>
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Display all 3634 possibilities? (y or n)
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nix-repl> lib<TAB>
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Display all 291 possibilities? (y or n)
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nix-repl> xorg.libX<TAB>
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xorg.libXdamage xorg.libXdmcp
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nix-repl> config.networking.use<TAB>
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config.networking.useDHCP config.networking.usePredictableInterfaceNames
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