https://github.com/arthurpaulino/leanrepl

https://github.com/arthurpaulino/leanrepl

lean lean4

Last synced: 15 days ago
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• Host: GitHub
• URL: https://github.com/arthurpaulino/leanrepl
• Owner: arthurpaulino
• License: apache-2.0
• Created: 2022-01-17T03:02:35.000Z (almost 3 years ago)
• Default Branch: master
• Last Pushed: 2022-08-01T20:38:28.000Z (over 2 years ago)
• Last Synced: 2024-11-29T14:40:37.022Z (23 days ago)
• Topics: lean, lean4
• Language: Lean
• Homepage:
• Size: 12.7 KB
• Stars: 12
• Watchers: 3
• Forks: 2
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# LeanREPL

A simple REPL environment for Lean 4 that also supports meta-commands

(commands starting with "!").

The code in this repository was adapted from:

* [`dselsam/lean-gym`](https://github.com/dselsam/lean-gym)

* [`abentkamp/hoare-logic`](https://github.com/abentkamp/hoare-logic)

## Usage

Run `.../LeanREPL$ lake build` and an executable file will be created under

`build/bin`.

Then you can run it and pass the initial imported modules. `Init` is already

added by default. Example:

```bash

.../LeanREPL$ ./build/bin/LeanREPL Std

```

## Meta-commands

Meta-commands are just commands that start with "!" and allow extra control

of the REPL. The ones available are:

* `!rb ` rolls the REPL back to the state it was `n` commands ago

* `!reset` resets the REPL to the initial state

* `!quit` exits the REPL

Example:

```lean

> def a := 1

> def a := 2 -- causes an error and doesn't stack a new state

repl:1:4: error: 'a' has already been declared

> def b := 2

> def c := 3

> !rb 2      -- undoes the definitions of `b` and `c`

> #check a

a : Nat

> #check b

repl:1:7: error: unknown identifier 'b'

> #check c

repl:1:7: error: unknown identifier 'c'

> !reset     -- undoes all definitions

> #check a

repl:1:7: error: unknown identifier 'a'

> !quit

```