35 lines
1.7 KiB
Markdown
35 lines
1.7 KiB
Markdown
# Quickstart
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These instructions will walk you through setting up Lean using the "basic" setup and VS Code as the editor.
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See [Setup](./setup.md) for other ways and more details on setting up Lean.
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1. Install the latest Lean 4 nightly through [`elan`](https://github.com/leanprover/elan): in any bash-compatible shell, run
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```sh
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curl https://raw.githubusercontent.com/leanprover/elan/master/elan-init.sh -sSf | sh -s -- --default-toolchain leanprover/lean4:nightly
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```
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On Windows, instead run in `cmd`
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```sh
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curl -O --location https://raw.githubusercontent.com/leanprover/elan/master/elan-init.ps1
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powershell -f elan-init.ps1 --default-toolchain leanprover/lean4:nightly
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del elan-init.ps1
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```
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See the [elan repo](https://github.com/leanprover/elan) for other installation options and details.
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1. Install [VS Code](https://code.visualstudio.com/).
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1. Open VS Code and install the `lean4` extension.
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1. Create a new file with the extension `.lean` and add the following code:
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```lean
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#eval Lean.versionString
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```
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You should get a syntax-highlighted file with a "Lean Infoview" on the right that tells you the installed Lean version when placing your cursor on the last line.
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1. You are set up! You can now also run `lake init foo` from the command line to create a package, followed by `lake build` to get an executable version of your Lean program.
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Note: Packages **have** to be opened using "File > Open Folder..." for imports to work.
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Saved changes are visible in other files after running "Lean 4: Refresh File Dependencies" (`Ctrl+Shift+X`).
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