2020-12-09 12:07:01 +00:00
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R""(
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# Examples
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* Display all special commands within the REPL:
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```console
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# nix repl
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nix-repl> :?
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```
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* Evaluate some simple Nix expressions:
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```console
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# nix repl
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nix-repl> 1 + 2
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3
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nix-repl> map (x: x * 2) [1 2 3]
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[ 2 4 6 ]
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```
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* Interact with Nixpkgs in the REPL:
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```console
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2022-03-11 18:26:08 +00:00
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# nix repl --file example.nix
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Loading Installable ''...
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Added 3 variables.
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2020-12-09 12:07:01 +00:00
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2022-03-11 18:26:08 +00:00
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# nix repl --expr '{a={b=3;c=4;};}'
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Loading Installable ''...
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Added 1 variables.
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# nix repl --expr '{a={b=3;c=4;};}' a
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Loading Installable ''...
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Added 1 variables.
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# nix repl nixpkgs
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Loading Installable 'flake:nixpkgs#'...
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Added 5 variables.
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nix-repl> legacyPackages.x86_64-linux.emacs.name
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"emacs-27.1"
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nix-repl> legacyPackages.x86_64-linux.emacs.name
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"emacs-27.1"
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nix-repl> :q
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# nix repl --expr 'import <nixpkgs>{}' --impure
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Loading Installable ''...
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Added 12439 variables.
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2020-12-09 12:07:01 +00:00
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nix-repl> emacs.name
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"emacs-27.1"
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nix-repl> emacs.drvPath
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"/nix/store/lp0sjrhgg03y2n0l10n70rg0k7hhyz0l-emacs-27.1.drv"
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2021-11-26 15:03:07 +00:00
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nix-repl> drv = runCommand "hello" { buildInputs = [ hello ]; } "hello; hello > $out"
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2020-12-09 12:07:01 +00:00
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2021-11-26 15:03:07 +00:00
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nix-repl> :b drv
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2020-12-09 12:07:01 +00:00
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this derivation produced the following outputs:
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out -> /nix/store/0njwbgwmkwls0w5dv9mpc1pq5fj39q0l-hello
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nix-repl> builtins.readFile drv
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"Hello, world!\n"
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2021-11-26 15:03:07 +00:00
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nix-repl> :log drv
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Hello, world!
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2020-12-09 12:07:01 +00:00
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```
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# Description
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This command provides an interactive environment for evaluating Nix
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expressions. (REPL stands for 'read–eval–print loop'.)
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On startup, it loads the Nix expressions named *files* and adds them
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into the lexical scope. You can load addition files using the `:l
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<filename>` command, or reload all files using `:r`.
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)""
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