readme: add short REPL section
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README.md
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README.md
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@ -32,6 +32,23 @@ $ env NIXPKGS_TESTS=yes PRETTY_TESTS=1 cabal v2-test
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$ ./dist/build/hnix/hnix --help
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```
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## Using the REPL
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To enter the `hnix` REPL use
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```
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hnix --repl
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```
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To evaluate an expression and make it available in the REPL
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as the `input` variable use
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```
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hnix --eval -E '(import <nixpkgs> {}).pkgs.hello' --repl
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```
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Use the `:help` command for a list of all available REPL commands.
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## Building with full debug info
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To build `hnix` for debugging, and with full tracing output and stack traces,
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