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lean4-htt/doc/quickstart.md
Sebastian Ullrich 91169f9987
doc: quickstart: formatting, again
2021-04-15 19:08:56 +02:00

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Quickstart

These instructions will walk you through setting up Lean using the "basic" setup and VS Code as the editor. See Setup for other ways and more details on setting up Lean.

  1. Install the latest Lean 4 nightly through elan: in any bash-compatible shell, run 
    $ curl https://raw.githubusercontent.com/Kha/elan/master/elan-init.sh -sSf | sh -s -- --default-toolchain leanprover/lean4:nightly
    See the elan link above for other installation options and details. Note that using Lean with multi-file projects on Windows currently comes with some additional limitations.
  2. Install VS Code.
  3. Open VS Code and install the lean4 extension.
    installing the vscode-lean4 extension
  4. Create a new file with the extension .lean and add the following code: 
    import Leanpkg

#eval Leanpkg.leanVersionString
    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.
    successful setup
  5. You are set up! Try opening a Lean package with a leanpkg.toml. You can create your own packages using leanpkg init on the command line. Packages have to be opened using "File > Open Folder..." for imports to work. Saved changes are visibly in other files after running "Lean 4: Refresh File Dependencies" (Ctrl+Shift+X) in them.