refactor: env. operations into its own file

Pantograph.lean

@@ -2,6 +2,7 @@ import Pantograph.Goal
 import Pantograph.Protocol
 import Pantograph.Serial
 import Pantograph.Symbol
+import Pantograph.Environment
 import Lean.Data.HashMap
 
 namespace Pantograph
@@ -59,7 +60,6 @@ def execute (command: Protocol.Command): MainM Lean.Json := do
   errorI (type desc: String): Protocol.InteractionError := { error := type, desc := desc }
   errorCommand := errorI "command"
   errorIndex := errorI "index"
-  errorExpr := errorI "expr"
   -- Command Functions
   reset (_: Protocol.Reset): MainM (CR Protocol.StatResult) := do
     let state ← get
@@ -70,76 +70,13 @@ def execute (command: Protocol.Command): MainM Lean.Json := do
     let state ← get
     let nGoals := state.goalStates.size
     return .ok { nGoals }
-  env_catalog (_: Protocol.EnvCatalog): MainM (CR Protocol.EnvCatalogResult) := do
-    let env ← Lean.MonadEnv.getEnv
-    let names := env.constants.fold (init := #[]) (λ acc name info =>
-      match to_filtered_symbol name info with
-      | .some x => acc.push x
-      | .none => acc)
-    return .ok { symbols := names }
+  env_catalog (args: Protocol.EnvCatalog): MainM (CR Protocol.EnvCatalogResult) := do
+    Environment.catalog args
   env_inspect (args: Protocol.EnvInspect): MainM (CR Protocol.EnvInspectResult) := do
     let state ← get
-    let env ← Lean.MonadEnv.getEnv
-    let name :=  args.name.toName
-    let info? := env.find? name
-    match info? with
-    | none => return .error $ errorIndex s!"Symbol not found {args.name}"
-    | some info =>
-      let module? := env.getModuleIdxFor? name >>=
-        (λ idx => env.allImportedModuleNames.get? idx.toNat) |>.map toString
-      let value? := match args.value?, info with
-        | .some true, _ => info.value?
-        | .some false, _ => .none
-        | .none, .defnInfo _ => info.value?
-        | .none, _ => .none
-      return .ok {
-        type := ← (serialize_expression state.options info.type).run',
-        value? := ← value?.mapM (λ v => serialize_expression state.options v |>.run'),
-        publicName? := Lean.privateToUserName? name |>.map (·.toString),
-        -- BUG: Warning: getUsedConstants here will not include projections. This is a known bug.
-        typeDependency? := if args.dependency?.getD false then .some <| info.type.getUsedConstants.map (λ n => name_to_ast n) else .none,
-        valueDependency? := if args.dependency?.getD false then info.value?.map (·.getUsedConstants.map (λ n => name_to_ast n)) else .none,
-        module? := module?
-      }
+    Environment.inspect args state.options
   env_add (args: Protocol.EnvAdd): MainM (CR Protocol.EnvAddResult) := do
-    let env ← Lean.MonadEnv.getEnv
-    let tv?: Except String (Lean.Expr × Lean.Expr) ← runTermElabM (do
-        let type ← match syntax_from_str env args.type with
-          | .ok syn => do
-            match ← syntax_to_expr syn with
-            | .error e => return .error e
-            | .ok expr => pure expr
-          | .error e => return .error e
-        let value ← match syntax_from_str env args.value with
-          | .ok syn => do
-            try
-              let expr ← Lean.Elab.Term.elabTerm (stx := syn) (expectedType? := .some type)
-              Lean.Elab.Term.synthesizeSyntheticMVarsNoPostponing
-              let expr ← Lean.instantiateMVars expr
-              pure $ expr
-            catch ex => return .error (← ex.toMessageData.toString)
-          | .error e => return .error e
-        pure $ .ok (type, value)
-      )
-    let (type, value) ← match tv? with
-      | .ok t => pure t
-      | .error e => return .error $ errorExpr e
-    let constant := Lean.Declaration.defnDecl <| Lean.mkDefinitionValEx
-      (name := args.name.toName)
-      (levelParams := [])
-      (type := type)
-      (value := value)
-      (hints := Lean.mkReducibilityHintsRegularEx 1)
-      (safety := Lean.DefinitionSafety.safe)
-      (all := [])
-    let env' ← match env.addDecl constant with
-      | .error e => do
-        let options ← Lean.MonadOptions.getOptions
-        let errorMessage ← (e.toMessageData options).toString
-        return .error $ errorI "kernel" errorMessage
-      | .ok env' => pure env'
-    Lean.MonadEnv.modifyEnv (λ _ => env')
-    return .ok {}
+    Environment.addDecl args
   expr_echo (args: Protocol.ExprEcho): MainM (CR Protocol.ExprEchoResult) := do
     let state ← get
     let env ← Lean.MonadEnv.getEnv

Pantograph/Environment.lean

@@ -0,0 +1,82 @@
+import Pantograph.Protocol
+import Pantograph.Symbol
+import Pantograph.Serial
+import Lean
+
+open Lean
+open Pantograph
+
+namespace Pantograph.Environment
+
+abbrev CR α := Except Protocol.InteractionError α
+
+def catalog (_: Protocol.EnvCatalog): CoreM (CR Protocol.EnvCatalogResult) := do
+  let env ← Lean.MonadEnv.getEnv
+  let names := env.constants.fold (init := #[]) (λ acc name info =>
+    match to_filtered_symbol name info with
+    | .some x => acc.push x
+    | .none => acc)
+  return .ok { symbols := names }
+def inspect (args: Protocol.EnvInspect) (options: Protocol.Options): CoreM (CR Protocol.EnvInspectResult) := do
+  let env ← Lean.MonadEnv.getEnv
+  let name :=  args.name.toName
+  let info? := env.find? name
+  match info? with
+  | none => return .error $ Protocol.errorIndex s!"Symbol not found {args.name}"
+  | some info =>
+    let module? := env.getModuleIdxFor? name >>=
+      (λ idx => env.allImportedModuleNames.get? idx.toNat) |>.map toString
+    let value? := match args.value?, info with
+      | .some true, _ => info.value?
+      | .some false, _ => .none
+      | .none, .defnInfo _ => info.value?
+      | .none, _ => .none
+    return .ok {
+      type := ← (serialize_expression options info.type).run',
+      value? := ← value?.mapM (λ v => serialize_expression options v |>.run'),
+      publicName? := Lean.privateToUserName? name |>.map (·.toString),
+      -- BUG: Warning: getUsedConstants here will not include projections. This is a known bug.
+      typeDependency? := if args.dependency?.getD false then .some <| info.type.getUsedConstants.map (λ n => name_to_ast n) else .none,
+      valueDependency? := if args.dependency?.getD false then info.value?.map (·.getUsedConstants.map (λ n => name_to_ast n)) else .none,
+      module? := module?
+    }
+def addDecl (args: Protocol.EnvAdd): CoreM (CR Protocol.EnvAddResult) := do
+  let env ← Lean.MonadEnv.getEnv
+  let tvM: Elab.TermElabM (Except String (Expr × Expr)) := do
+    let type ← match syntax_from_str env args.type with
+      | .ok syn => do
+        match ← syntax_to_expr syn with
+        | .error e => return .error e
+        | .ok expr => pure expr
+      | .error e => return .error e
+    let value ← match syntax_from_str env args.value with
+      | .ok syn => do
+        try
+          let expr ← Elab.Term.elabTerm (stx := syn) (expectedType? := .some type)
+          Lean.Elab.Term.synthesizeSyntheticMVarsNoPostponing
+          let expr ← instantiateMVars expr
+          pure $ expr
+        catch ex => return .error (← ex.toMessageData.toString)
+      | .error e => return .error e
+    pure $ .ok (type, value)
+  let (type, value) ← match ← tvM.run' (ctx := {}) |>.run' with
+    | .ok t => pure t
+    | .error e => return .error $ Protocol.errorExpr e
+  let constant := Lean.Declaration.defnDecl <| Lean.mkDefinitionValEx
+    (name := args.name.toName)
+    (levelParams := [])
+    (type := type)
+    (value := value)
+    (hints := Lean.mkReducibilityHintsRegularEx 1)
+    (safety := Lean.DefinitionSafety.safe)
+    (all := [])
+  let env' ← match env.addDecl constant with
+    | .error e => do
+      let options ← Lean.MonadOptions.getOptions
+      let desc ← (e.toMessageData options).toString
+      return .error $ { error := "kernel", desc }
+    | .ok env' => pure env'
+  Lean.MonadEnv.modifyEnv (λ _ => env')
+  return .ok {}
+
+end Pantograph.Environment

Pantograph/Protocol.lean

@@ -79,6 +79,9 @@ structure InteractionError where
   desc: String
   deriving Lean.ToJson
 
+def errorIndex (desc: String): InteractionError := { error := "index", desc }
+def errorExpr (desc: String): InteractionError := { error := "expr", desc }
+
 
 --- Individual command and return types ---