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doc/crystal: Update to mention shard.lock file generation

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Silvan Mosberger 2019-12-16 16:04:58 +01:00 committed by Simon Bruder
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doc/languages-frameworks/crystal.section.md
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@ -4,12 +4,12 @@
This section uses [Mint](https://github.com/mint-lang/mint) as an example for how to build a Crystal package.
If the Crystal project has any dependencies, the first step is to get a `shards.nix` file encoding those. Get a copy of the project and go to its root directory such that its `shard.lock` file is in the current directory, then run `crystal2nix` in it
If the Crystal project has any dependencies, the first step is to get a `shards.nix` file encoding those. Get a copy of the project and go to its root directory such that its `shard.lock` file is in the current directory. Executable projects should usually commit the `shard.lock` file, but sometimes that's not the case, which means you need to generate it yourself. With an existing `shard.lock` file, `crystal2nix` can be run.
```bash
$ git clone https://github.com/mint-lang/mint
$ cd mint
$ git checkout 0.5.0
$ if [ ! -f shard.lock ]; then nix-shell -p shards --run "shards lock"; fi
$ nix-shell -p crystal2nix --run crystal2nix
```