67 lines
3.7 KiB
Markdown
67 lines
3.7 KiB
Markdown
# REPL
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## Commands
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See `Pantograph/Protocol.lean` for a description of the parameters and return values in JSON.
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* `reset`: Delete all cached expressions and proof trees
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* `stat`: Display resource usage
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* `expr.echo {"expr": <expr>, "type": <optional expected type>, ["levels": [<levels>]]}`: Determine the
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type of an expression and format it.
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* `env.catalog`: Display a list of all safe Lean symbols in the current environment
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* `env.inspect {"name": <name>, "value": <bool>}`: Show the type and package of a
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given symbol; If value flag is set, the value is printed or hidden. By default
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only the values of definitions are printed.
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* `env.save { "path": <fileName> }`, `env.load { "path": <fileName> }`: Save/Load the
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current environment to/from a file
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* `options.set { key: value, ... }`: Set one or more options (not Lean options; those
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have to be set via command line arguments.), for options, see `Pantograph/Protocol.lean`
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One particular option for interest for machine learning researchers is the
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automatic mode (flag: `"automaticMode"`). By default it is turned on, with
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all goals automatically resuming. This makes Pantograph act like a gym,
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with no resumption necessary to manage your goals.
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* `options.print`: Display the current set of options
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* `goal.start {["name": <name>], ["expr": <expr>], ["levels": [<levels>]], ["copyFrom": <symbol>]}`:
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Start a new proof from a given expression or symbol
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* `goal.tactic {"stateId": <id>, "goalId": <id>, ...}`: Execute a tactic string on a
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given goal. The tactic is supplied as additional key-value pairs in one of the following formats:
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- `{ "tactic": <tactic> }`: Execute an ordinary tactic
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- `{ "expr": <expr> }`: Assign the given proof term to the current goal
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- `{ "have": <expr>, "binderName": <name> }`: Execute `have` and creates a branch goal
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- `{ "calc": <expr> }`: Execute one step of a `calc` tactic. Each step must
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be of the form `lhs op rhs`. An `lhs` of `_` indicates that it should be set
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to the previous `rhs`.
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- `{ "conv": <bool> }`: Enter or exit conversion tactic mode. In the case of
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exit, the goal id is ignored.
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* `goal.continue {"stateId": <id>, ["branch": <id>], ["goals": <names>]}`:
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Execute continuation/resumption
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- `{ "branch": <id> }`: Continue on branch state. The current state must have no goals.
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- `{ "goals": <names> }`: Resume the given goals
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* `goal.remove {"stateIds": [<id>]}"`: Drop the goal states specified in the list
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* `goal.print {"stateId": <id>}"`: Print a goal state
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* `goal.save { "id": <id>, "path": <fileName> }`, `goal.load { "path": <fileName> }`:
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Save/Load a goal state to/from a file. The environment is not carried with the
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state. The user is responsible to ensure the sender/receiver instances share
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the same environment.
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* `frontend.process { ["fileName": <fileName>,] ["file": <str>], invocations:
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<bool>, sorrys: <bool>, newConstants: <bool> }`: Executes the Lean frontend on
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a file, collecting the tactic invocations (`"invocations": true`), the
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sorrys and type errors into goal states (`"sorrys": true`), and new constants
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(`"newConstants": true`). In the case of `sorrys`, this command additionally
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outputs the position of each captured `sorry`.
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## Errors
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When an error pertaining to the execution of a command happens, the returning JSON structure is
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``` json
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{ "error": "type", "desc": "description" }
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```
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Common error forms:
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* `command`: Indicates malformed command structure which results from either
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invalid command or a malformed JSON structure that cannot be fed to an
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individual command.
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* `index`: Indicates an invariant maintained by the output of one command and
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input of another is broken. For example, attempting to query a symbol not
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existing in the library or indexing into a non-existent proof state.
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