Add documentation; Remove mathlib dependency

Main.lean

@@ -110,7 +110,10 @@ def execute (command: Command): Subroutine Lean.Json := do
       | .ok expr => do
         try
           let format ← Lean.Meta.ppExpr (← Lean.Meta.inferType expr)
-          return Lean.toJson <| ({ type := toString format }: ExprTypeResult)
+          return Lean.toJson <| ({
+              type := toString format,
+              roundTrip := toString <| (← Lean.Meta.ppExpr expr)
+          }: ExprTypeResult)
         catch exception =>
           return errorI "typing" (← exception.toMessageData.toString)
   proof_start (args: ProofStart): Subroutine Lean.Json := do

Pantograph/Commands.lean

@@ -52,6 +52,7 @@ structure ExprType where
   deriving Lean.FromJson
 structure ExprTypeResult where
   type: String
+  roundTrip: String
   deriving Lean.ToJson
 
 structure ProofStart where

Pantograph/Serial.lean

@@ -20,7 +20,7 @@ def syntax_from_str (env: Environment) (s: String): Except String Syntax :=
     (fileName := "<stdin>")
 
 
-def syntax_to_expr (syn: Syntax): Elab.TermElabM (Except String Expr) := do
+def syntax_to_expr_type (syn: Syntax): Elab.TermElabM (Except String Expr) := do
   try
     let expr ← Elab.Term.elabType syn
     -- Immediately synthesise all metavariables if we need to leave the elaboration context.
@@ -29,6 +29,15 @@ def syntax_to_expr (syn: Syntax): Elab.TermElabM (Except String Expr) := do
     let expr ← instantiateMVars expr
     return .ok expr
   catch ex => return .error (← ex.toMessageData.toString)
+def syntax_to_expr (syn: Syntax): Elab.TermElabM (Except String Expr) := do
+  try
+    let expr ← Elab.Term.elabTerm (stx := syn) (expectedType? := .none)
+    -- Immediately synthesise all metavariables if we need to leave the elaboration context.
+    -- See https://leanprover.zulipchat.com/#narrow/stream/270676-lean4/topic/Unknown.20universe.20metavariable/near/360130070
+    --Elab.Term.synthesizeSyntheticMVarsNoPostponing
+    let expr ← instantiateMVars expr
+    return .ok expr
+  catch ex => return .error (← ex.toMessageData.toString)
 
 structure BoundExpression where
   binders: Array (String × String)

README.md

@@ -2,20 +2,23 @@
 
 An interaction system for Lean 4.
 
+![Pantograph](doc/icon.svg)
+
 ## Installation
 
 Install `elan` and `lean4`. Then, execute
 ``` sh
 lake build
 ```
-In order to use `mathlib`, its binary must also be built
+Then, setup the `LEAN_PATH` environment variable so it contains the library path of lean libraries. The libraries must be built in advance. For example, if `mathlib4` is stored at `../lib/mathlib4`,
 ``` sh
-lake build Qq
-lake build aesop
-lake build std
-lake build mathlib
+LIB="../lib"
+LIB_MATHLIB="$LIB/mathlib4/lake-packages"
+export LEAN_PATH="$LIB/mathlib4/build/lib:$LIB_MATHLIB/aesop/build/lib:$LIB_MATHLIB/Qq/build/lib:$LIB_MATHLIB/std/build/lib"
+
+LEAN_PATH=$LEAN_PATH build/bin/pantograph $@
 ```
-In a future version, the dependencies of mathlib will be removed and the user will be responsible for adding such library paths to `LEAN_PATH`.
+Note that `lean-toolchain` must be present in the `$PWD` in order to run Pantograph! This is because Pantograph taps into Lean's internals.
 
 ## Usage
 
@@ -42,7 +45,7 @@ $ build/bin/Pantograph Init
 catalog
 inspect {"name": "Nat.le_add_left"}
 ```
-Example with `mathlib` (~90k symbols)
+Example with `mathlib4` (~90k symbols, may stack overflow, see troubleshooting)
 ```
 $ lake env build/bin/Pantograph Mathlib.Analysis.Seminorm
 catalog
@@ -59,6 +62,17 @@ proof.printTree {"treeId": 0}
 ```
 where the application of `assumption` should lead to a failure.
 
+## Commands
+
+See `Pantograph/Commands.lean` for a description of the parameters and return values in Json.
+- `catalog`: Display a list of all safe Lean symbols in the current context
+- `inspect {"name": <name>}`: Show the type and package of a given symbol
+- `clear`: Delete all cached expressions and proof trees
+- `expr.type {"expr": <expr>}`: Determine the type of an expression and round-trip it
+- `proof.start {["name": <name>], ["expr": <expr>], ["copyFrom": <symbol>]}`: Start a new proof state from a given expression or symbol
+- `proof.tactic {"treeId": <id>, "stateId": <id>, "goalId": <id>, "tactic": string}`: Execute a tactic on a given proof state
+- `proof.printTree {"treeId": <id>}`: Print the topological structure of a proof tree
+
 ## Troubleshooting
 
 If lean encounters stack overflow problems when printing catalog, execute this before running lean:

doc/icon.svg

@@ -0,0 +1,73 @@
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lakefile.lean

@@ -3,11 +3,7 @@ open Lake DSL
 
 package pantograph
 
-require mathlib from git
-  "https://github.com/leanprover-community/mathlib4.git" @  "8e5a00a8afc8913c0584cb85f37951995275fd87"
-
 lean_lib Pantograph {
-  -- add library configuration options here
 }
 
 @[default_target]
@@ -20,11 +16,9 @@ lean_exe pantograph {
 require LSpec from git
   "https://github.com/lurk-lab/LSpec.git" @ "88f7d23e56a061d32c7173cea5befa4b2c248b41"
 lean_lib Test {
-  -- add library configuration options here
 }
 lean_exe test {
   root := `Test.Main
   -- Somehow solves the native symbol not found problem
   supportInterpreter := true
-
 }