From 4ab23f9d57297e34272e423b34ff91db0a1053c0 Mon Sep 17 00:00:00 2001
From: rex <1073853456@qq.com>
Date: Fri, 11 Apr 2025 04:05:17 +0800
Subject: [PATCH 01/10] add gc option

---
 REPL/JSON.lean | 9 +++++++--
 REPL/Main.lean | 6 +++++-
 2 files changed, 12 insertions(+), 3 deletions(-)

diff --git a/REPL/JSON.lean b/REPL/JSON.lean
index 24db8402..2b765c0b 100644
--- a/REPL/JSON.lean
+++ b/REPL/JSON.lean
@@ -27,6 +27,7 @@ If `env = some n`, builds on the existing environment `n`.
 structure Command extends CommandOptions where
   env : Option Nat
   cmd : String
+  gc : Option Bool := false
 deriving ToJson, FromJson
 
 /-- Process a Lean file in a fresh environment. -/
@@ -121,7 +122,7 @@ A response to a Lean command.
 `env` can be used in later calls, to build on the stored environment.
 -/
 structure CommandResponse where
-  env : Nat
+  env : Option Nat := none
   messages : List Message := []
   sorries : List Sorry := []
   tactics : List Tactic := []
@@ -132,9 +133,13 @@ def Json.nonemptyList [ToJson α] (k : String) : List α → List (String × Jso
   | [] => []
   | l  => [⟨k, toJson l⟩]
 
+def Json.optField [ToJson α] (k : String) : Option α → List (String × Json)
+  | none => []
+  | some v => [(k, toJson v)]
+
 instance : ToJson CommandResponse where
   toJson r := Json.mkObj <| .flatten [
-    [("env", r.env)],
+    Json.optField "env" r.env,
     Json.nonemptyList "messages" r.messages,
     Json.nonemptyList "sorries" r.sorries,
     Json.nonemptyList "tactics" r.tactics,
diff --git a/REPL/Main.lean b/REPL/Main.lean
index ec8bf891..556cc44d 100644
--- a/REPL/Main.lean
+++ b/REPL/Main.lean
@@ -272,7 +272,11 @@ def runCommand (s : Command) : M IO (CommandResponse ⊕ Error) := do
         fileMap := default,
         snap? := none,
         cancelTk? := none } }
-  let env ← recordCommandSnapshot cmdSnapshot
+  let env ← match s.gc with
+  | some true => pure none
+  | _ => do
+    let id ← recordCommandSnapshot cmdSnapshot
+    pure (some id)
   let jsonTrees := match s.infotree with
   | some "full" => trees
   | some "tactics" => trees.flatMap InfoTree.retainTacticInfo

From 8e88e865c0dcc192664616f8ce82f5a84f2a4649 Mon Sep 17 00:00:00 2001
From: rex <1073853456@qq.com>
Date: Fri, 11 Apr 2025 04:48:26 +0800
Subject: [PATCH 02/10] add gc option tests

---
 test/gc.expected.out        | 17 ++++++++++++++
 test/gc.in                  |  7 ++++++
 test/gc_tactic.expected.out | 44 +++++++++++++++++++++++++++++++++++++
 test/gc_tactic.in           |  9 ++++++++
 4 files changed, 77 insertions(+)
 create mode 100644 test/gc.expected.out
 create mode 100644 test/gc.in
 create mode 100644 test/gc_tactic.expected.out
 create mode 100644 test/gc_tactic.in

diff --git a/test/gc.expected.out b/test/gc.expected.out
new file mode 100644
index 00000000..5778387e
--- /dev/null
+++ b/test/gc.expected.out
@@ -0,0 +1,17 @@
+{"env": 0}
+
+{"messages":
+ [{"severity": "info",
+   "pos": {"line": 1, "column": 0},
+   "endPos": {"line": 1, "column": 5},
+   "data": "true"}]}
+
+{"message": "Unknown environment."}
+
+{"messages":
+ [{"severity": "info",
+   "pos": {"line": 1, "column": 0},
+   "endPos": {"line": 1, "column": 5},
+   "data": "37"}],
+ "env": 1}
+
diff --git a/test/gc.in b/test/gc.in
new file mode 100644
index 00000000..3d24912e
--- /dev/null
+++ b/test/gc.in
@@ -0,0 +1,7 @@
+{"cmd": "def f := 37"}
+
+{"cmd": "#eval true", "gc": true}
+
+{"cmd": "#eval false", "env":1}
+
+{"cmd": "#eval f", "env":0}
diff --git a/test/gc_tactic.expected.out b/test/gc_tactic.expected.out
new file mode 100644
index 00000000..d76ff33b
--- /dev/null
+++ b/test/gc_tactic.expected.out
@@ -0,0 +1,44 @@
+{"messages":
+ [{"severity": "error",
+   "pos": {"line": 1, "column": 20},
+   "endPos": null,
+   "data": "unexpected end of input; expected '{'"},
+  {"severity": "error",
+   "pos": {"line": 1, "column": 18},
+   "endPos": {"line": 1, "column": 20},
+   "data": "unsolved goals\n⊢ 2 = 2"}],
+ "env": 0}
+
+{"messages":
+ [{"severity": "info",
+   "pos": {"line": 1, "column": 0},
+   "endPos": {"line": 2, "column": 3},
+   "data": "Goals accomplished!"}],
+ "env": 1}
+
+{"messages":
+ [{"severity": "error",
+   "pos": {"line": 1, "column": 66},
+   "endPos": null,
+   "data": "unexpected end of input; expected '{'"},
+  {"severity": "error",
+   "pos": {"line": 1, "column": 64},
+   "endPos": {"line": 1, "column": 66},
+   "data": "unsolved goals\nP Q R : Prop\n⊢ (P → Q) → (Q → R) → P → R"}]}
+
+{"messages":
+ [{"severity": "error",
+   "pos": {"line": 1, "column": 64},
+   "endPos": {"line": 2, "column": 13},
+   "data": "unsolved goals\nP Q R : Prop\nh1 : P → Q\nh2 : Q → R\np : P\n⊢ R"}]}
+
+{"messages":
+ [{"severity": "info",
+   "pos": {"line": 3, "column": 0},
+   "endPos": {"line": 3, "column": 6},
+   "data": "Try this: exact h2 (h1 p)"},
+  {"severity": "info",
+   "pos": {"line": 1, "column": 0},
+   "endPos": {"line": 3, "column": 6},
+   "data": "Goals accomplished!"}]}
+
diff --git a/test/gc_tactic.in b/test/gc_tactic.in
new file mode 100644
index 00000000..e0218242
--- /dev/null
+++ b/test/gc_tactic.in
@@ -0,0 +1,9 @@
+{"cmd": "example  : 2=2 := by"}
+
+{"cmd": "example  : 2=2 := by\nrfl"}
+
+{"cmd": "theorem gc_demo (P Q R : Prop) : (P → Q) → (Q → R) → (P → R) := by", "gc": true}
+
+{"cmd": "theorem gc_demo (P Q R : Prop) : (P → Q) → (Q → R) → (P → R) := by\nintro h1 h2 p", "gc": true}
+
+{"cmd": "theorem gc_demo (P Q R : Prop) : (P → Q) → (Q → R) → (P → R) := by\nintro h1 h2 p\napply?", "gc": true}

From cf63ddc94f963f705c66618ad32cc9580533dc56 Mon Sep 17 00:00:00 2001
From: rex <1073853456@qq.com>
Date: Fri, 11 Apr 2025 13:12:26 +0800
Subject: [PATCH 03/10] update readme

---
 README.md      | 14 ++++++++++++++
 REPL/JSON.lean |  2 ++
 2 files changed, 16 insertions(+)

diff --git a/README.md b/README.md
index d6adc283..8108ccb7 100644
--- a/README.md
+++ b/README.md
@@ -20,6 +20,19 @@ Commands may be of the form
 { "cmd" : "example : f = 2 := rfl", "env" : 1 }
 ```
 
+```json
+{ "cmd" : "example : f = 2 := rfl", "env" : 1, "gc": true }
+```
+
+The input includes:
+* A required `cmd` field containing the Lean command to execute
+* An optional `env` field specifying a previous environment ID to build upon
+* An optional `gc` field (default: false) to discard the environment after execution
+* Optional fields for additional information:
+  * `allTactics`: when true, includes all tactic steps in the response
+  * `rootGoals`: when true, includes root goals as sorries
+  * `infotree`: specifies the level of info tree detail ("full", "tactics", "original", or "substantive")
+
 The `env` field, if present,
 must contain a number received in the `env` field of a previous response,
 and causes the command to be run in the existing environment.
@@ -33,6 +46,7 @@ You can backtrack simply by using earlier values for `env`.
 The response includes:
 * A numeric label for the `Environment` after your command,
   which you can use as the starting point for subsequent commands.
+  This will be `none` if `gc` was enabled.
 * Any messages generated while processing your command.
 * A list of the `sorry`s in your command, including
   * their expected type, and
diff --git a/REPL/JSON.lean b/REPL/JSON.lean
index 2b765c0b..86f81527 100644
--- a/REPL/JSON.lean
+++ b/REPL/JSON.lean
@@ -23,6 +23,8 @@ structure CommandOptions where
 /-- Run Lean commands.
 If `env = none`, starts a new session (in which you can use `import`).
 If `env = some n`, builds on the existing environment `n`.
+Setting `gc = true` will discard the environment after execution, useful for memory management.
+When `gc = true`, the response's `env` field will be `none`.
 -/
 structure Command extends CommandOptions where
   env : Option Nat

From bac41b9d7129886db4729798ca1432d6c3f1f55c Mon Sep 17 00:00:00 2001
From: rex <1073853456@qq.com>
Date: Mon, 14 Apr 2025 18:37:34 +0800
Subject: [PATCH 04/10] @ohyeat: replace loop by tail recursion

---
 REPL/Main.lean | 39 ++++++++++++++++++++++-----------------
 1 file changed, 22 insertions(+), 17 deletions(-)

diff --git a/REPL/Main.lean b/REPL/Main.lean
index b63724cd..f383e194 100644
--- a/REPL/Main.lean
+++ b/REPL/Main.lean
@@ -422,23 +422,28 @@ def printFlush [ToString α] (s : α) : IO Unit := do
   out.flush -- Flush the output
 
 /-- Read-eval-print loop for Lean. -/
-unsafe def repl : IO Unit :=
-  StateT.run' loop {}
-where loop : M IO Unit := do
-  let query ← getLines
-  if query = "" then
-    return ()
-  if query.startsWith "#" || query.startsWith "--" then loop else
-  IO.println <| toString <| ← match ← parse query with
-  | .command r => return toJson (← runCommand r)
-  | .file r => return toJson (← processFile r)
-  | .proofStep r => return toJson (← runProofStep r)
-  | .pickleEnvironment r => return toJson (← pickleCommandSnapshot r)
-  | .unpickleEnvironment r => return toJson (← unpickleCommandSnapshot r)
-  | .pickleProofSnapshot r => return toJson (← pickleProofSnapshot r)
-  | .unpickleProofSnapshot r => return toJson (← unpickleProofSnapshot r)
-  printFlush "\n" -- easier to parse the output if there are blank lines
-  loop
+unsafe def repl : IO Unit := do
+  let rec loop (s : State) : IO Unit := do
+    let query ← getLines
+    if query = "" then
+      return ()
+    else if query.startsWith "#" || query.startsWith "--" then
+      loop s
+    else
+      let (result, s') ← StateT.run (do
+        match ← parse query with
+        | .command r => pure <| toJson (← runCommand r)
+        | .file r => pure <| toJson (← processFile r)
+        | .proofStep r => pure <| toJson (← runProofStep r)
+        | .pickleEnvironment r => pure <| toJson (← pickleCommandSnapshot r)
+        | .unpickleEnvironment r => pure <| toJson (← unpickleCommandSnapshot r)
+        | .pickleProofSnapshot r => pure <| toJson (← pickleProofSnapshot r)
+        | .unpickleProofSnapshot r => pure <| toJson (← unpickleProofSnapshot r)
+      ) s
+      IO.println (toString result)
+      printFlush "\n" -- easier to parse the output if there are blank lines
+      loop s'
+  loop {}
 
 /-- Main executable function, run as `lake exe repl`. -/
 unsafe def main (_ : List String) : IO Unit := do

From f867ab25215e776d93ffd638c38789f948915968 Mon Sep 17 00:00:00 2001
From: rex <1073853456@qq.com>
Date: Wed, 16 Apr 2025 01:07:18 +0800
Subject: [PATCH 05/10] rename `gc` to `discard`

---
 README.md                                     |  6 +--
 REPL/JSON.lean                                |  6 +--
 REPL/Main.lean                                |  2 +-
 test/Mathlib/test/discardCmd.expected.out     | 30 ++++++++++++++
 test/Mathlib/test/discardCmd.in               |  9 ++++
 ...c.expected.out => discardCmd.expected.out} |  0
 test/{gc.in => discardCmd.in}                 |  2 +-
 ....expected.out => discardCmd2.expected.out} |  0
 test/{gc_tactic.in => discardCmd2.in}         |  6 +--
 test/discardCmd_proof.expected.out            | 41 +++++++++++++++++++
 test/discardCmd_proof.in                      | 11 +++++
 11 files changed, 102 insertions(+), 11 deletions(-)
 create mode 100644 test/Mathlib/test/discardCmd.expected.out
 create mode 100644 test/Mathlib/test/discardCmd.in
 rename test/{gc.expected.out => discardCmd.expected.out} (100%)
 rename test/{gc.in => discardCmd.in} (68%)
 rename test/{gc_tactic.expected.out => discardCmd2.expected.out} (100%)
 rename test/{gc_tactic.in => discardCmd2.in} (62%)
 create mode 100644 test/discardCmd_proof.expected.out
 create mode 100644 test/discardCmd_proof.in

diff --git a/README.md b/README.md
index 8108ccb7..3666fefe 100644
--- a/README.md
+++ b/README.md
@@ -21,13 +21,13 @@ Commands may be of the form
 ```
 
 ```json
-{ "cmd" : "example : f = 2 := rfl", "env" : 1, "gc": true }
+{ "cmd" : "example : f = 2 := rfl", "env" : 1, "discard": true }
 ```
 
 The input includes:
 * A required `cmd` field containing the Lean command to execute
 * An optional `env` field specifying a previous environment ID to build upon
-* An optional `gc` field (default: false) to discard the environment after execution
+* An optional `discard` field (default: false) to discard the environment after execution
 * Optional fields for additional information:
   * `allTactics`: when true, includes all tactic steps in the response
   * `rootGoals`: when true, includes root goals as sorries
@@ -46,7 +46,7 @@ You can backtrack simply by using earlier values for `env`.
 The response includes:
 * A numeric label for the `Environment` after your command,
   which you can use as the starting point for subsequent commands.
-  This will be `none` if `gc` was enabled.
+  This will be `none` if `discard` was enabled.
 * Any messages generated while processing your command.
 * A list of the `sorry`s in your command, including
   * their expected type, and
diff --git a/REPL/JSON.lean b/REPL/JSON.lean
index 86f81527..c5d4781f 100644
--- a/REPL/JSON.lean
+++ b/REPL/JSON.lean
@@ -23,13 +23,13 @@ structure CommandOptions where
 /-- Run Lean commands.
 If `env = none`, starts a new session (in which you can use `import`).
 If `env = some n`, builds on the existing environment `n`.
-Setting `gc = true` will discard the environment after execution, useful for memory management.
-When `gc = true`, the response's `env` field will be `none`.
+Setting `discard = true` will discard the environment after execution, useful for memory management.
+When `discard = true`, the response's `env` field will be `none`.
 -/
 structure Command extends CommandOptions where
   env : Option Nat
   cmd : String
-  gc : Option Bool := false
+  discard : Option Bool := false
 deriving ToJson, FromJson
 
 /-- Process a Lean file in a fresh environment. -/
diff --git a/REPL/Main.lean b/REPL/Main.lean
index f383e194..529e80ad 100644
--- a/REPL/Main.lean
+++ b/REPL/Main.lean
@@ -322,7 +322,7 @@ def runCommand (s : Command) : M IO (CommandResponse ⊕ Error) := do
         fileMap := default,
         snap? := none,
         cancelTk? := none } }
-  let env ← match s.gc with
+  let env ← match s.discard with
   | some true => pure none
   | _ => do
     let id ← recordCommandSnapshot cmdSnapshot
diff --git a/test/Mathlib/test/discardCmd.expected.out b/test/Mathlib/test/discardCmd.expected.out
new file mode 100644
index 00000000..6182be78
--- /dev/null
+++ b/test/Mathlib/test/discardCmd.expected.out
@@ -0,0 +1,30 @@
+{"env": 0}
+
+{"sorries":
+ [{"proofState": 0,
+   "pos": {"line": 1, "column": 93},
+   "goal": "⊢ (2000 + 2001 + 2002 + 2003 + 2004 + 2005 + 2006) % 7 = 0",
+   "endPos": {"line": 1, "column": 98}}],
+ "messages":
+ [{"severity": "warning",
+   "pos": {"line": 1, "column": 8},
+   "endPos": {"line": 1, "column": 30},
+   "data": "declaration uses 'sorry'"}],
+ "env": 1}
+
+{"proofStatus": "Completed", "proofState": 1, "goals": []}
+
+{"sorries":
+ [{"proofState": 2,
+   "pos": {"line": 1, "column": 93},
+   "goal": "⊢ (2000 + 2001 + 2002 + 2003 + 2004 + 2005 + 2006) % 7 = 0",
+   "endPos": {"line": 1, "column": 98}}],
+ "messages":
+ [{"severity": "warning",
+   "pos": {"line": 1, "column": 8},
+   "endPos": {"line": 1, "column": 30},
+   "data": "declaration uses 'sorry'"}],
+ "env": 2}
+
+{"proofStatus": "Completed", "proofState": 3, "goals": []}
+
diff --git a/test/Mathlib/test/discardCmd.in b/test/Mathlib/test/discardCmd.in
new file mode 100644
index 00000000..ae2069e6
--- /dev/null
+++ b/test/Mathlib/test/discardCmd.in
@@ -0,0 +1,9 @@
+{"cmd": "import Mathlib"}
+
+{"cmd": "theorem mathd_numbertheory_345 : (2000 + 2001 + 2002 + 2003 + 2004 + 2005 + 2006) % 7 = 0 := sorry", "env":0, "discard": true}
+
+{"tactic": "norm_num", "proofState": 0}
+
+{"cmd": "theorem mathd_numbertheory_345 : (2000 + 2001 + 2002 + 2003 + 2004 + 2005 + 2006) % 7 = 0 := sorry", "env":0}
+
+{"tactic": "norm_num", "proofState": 2}
diff --git a/test/gc.expected.out b/test/discardCmd.expected.out
similarity index 100%
rename from test/gc.expected.out
rename to test/discardCmd.expected.out
diff --git a/test/gc.in b/test/discardCmd.in
similarity index 68%
rename from test/gc.in
rename to test/discardCmd.in
index 3d24912e..bee0cfbf 100644
--- a/test/gc.in
+++ b/test/discardCmd.in
@@ -1,6 +1,6 @@
 {"cmd": "def f := 37"}
 
-{"cmd": "#eval true", "gc": true}
+{"cmd": "#eval true", "discard": true}
 
 {"cmd": "#eval false", "env":1}
 
diff --git a/test/gc_tactic.expected.out b/test/discardCmd2.expected.out
similarity index 100%
rename from test/gc_tactic.expected.out
rename to test/discardCmd2.expected.out
diff --git a/test/gc_tactic.in b/test/discardCmd2.in
similarity index 62%
rename from test/gc_tactic.in
rename to test/discardCmd2.in
index e0218242..ae7b296d 100644
--- a/test/gc_tactic.in
+++ b/test/discardCmd2.in
@@ -2,8 +2,8 @@
 
 {"cmd": "example  : 2=2 := by\nrfl"}
 
-{"cmd": "theorem gc_demo (P Q R : Prop) : (P → Q) → (Q → R) → (P → R) := by", "gc": true}
+{"cmd": "theorem gc_demo (P Q R : Prop) : (P → Q) → (Q → R) → (P → R) := by", "discard": true}
 
-{"cmd": "theorem gc_demo (P Q R : Prop) : (P → Q) → (Q → R) → (P → R) := by\nintro h1 h2 p", "gc": true}
+{"cmd": "theorem gc_demo (P Q R : Prop) : (P → Q) → (Q → R) → (P → R) := by\nintro h1 h2 p", "discard": true}
 
-{"cmd": "theorem gc_demo (P Q R : Prop) : (P → Q) → (Q → R) → (P → R) := by\nintro h1 h2 p\napply?", "gc": true}
+{"cmd": "theorem gc_demo (P Q R : Prop) : (P → Q) → (Q → R) → (P → R) := by\nintro h1 h2 p\napply?", "discard": true}
diff --git a/test/discardCmd_proof.expected.out b/test/discardCmd_proof.expected.out
new file mode 100644
index 00000000..2e5fa6d7
--- /dev/null
+++ b/test/discardCmd_proof.expected.out
@@ -0,0 +1,41 @@
+{"sorries":
+ [{"proofState": 0,
+   "pos": {"line": 1, "column": 20},
+   "goal": "⊢ 1 = 1",
+   "endPos": {"line": 1, "column": 25}}],
+ "messages":
+ [{"severity": "warning",
+   "pos": {"line": 1, "column": 0},
+   "endPos": {"line": 1, "column": 7},
+   "data": "declaration uses 'sorry'"}]}
+
+{"sorries":
+ [{"proofState": 1,
+   "pos": {"line": 1, "column": 20},
+   "goal": "⊢ 1 = 1",
+   "endPos": {"line": 1, "column": 25}}],
+ "messages":
+ [{"severity": "warning",
+   "pos": {"line": 1, "column": 0},
+   "endPos": {"line": 1, "column": 7},
+   "data": "declaration uses 'sorry'"}],
+ "env": 0}
+
+{"sorries":
+ [{"proofState": 2,
+   "pos": {"line": 1, "column": 20},
+   "goal": "⊢ 1 = 1",
+   "endPos": {"line": 1, "column": 25}}],
+ "messages":
+ [{"severity": "warning",
+   "pos": {"line": 1, "column": 0},
+   "endPos": {"line": 1, "column": 7},
+   "data": "declaration uses 'sorry'"}],
+ "env": 1}
+
+{"proofStatus": "Completed", "proofState": 3, "goals": []}
+
+{"proofStatus": "Completed", "proofState": 4, "goals": []}
+
+{"proofStatus": "Completed", "proofState": 5, "goals": []}
+
diff --git a/test/discardCmd_proof.in b/test/discardCmd_proof.in
new file mode 100644
index 00000000..cd8c8d99
--- /dev/null
+++ b/test/discardCmd_proof.in
@@ -0,0 +1,11 @@
+{"cmd": "example : 1=1 := by sorry", "discard": true}
+
+{"cmd": "example : 1=1 := by sorry", "discard": false}
+
+{"cmd": "example : 1=1 := by sorry"}
+
+{"tactic": "rfl", "proofState": 0}
+
+{"tactic": "rfl", "proofState": 1}
+
+{"tactic": "rfl", "proofState": 2}

From 91abba5881793c16c756ff8e1a5b4fc57a586b3e Mon Sep 17 00:00:00 2001
From: rex <1073853456@qq.com>
Date: Wed, 16 Apr 2025 01:43:07 +0800
Subject: [PATCH 06/10] rename discard to record

---
 README.md                                                  | 6 +++---
 REPL/JSON.lean                                             | 6 +++---
 REPL/Main.lean                                             | 7 ++++---
 .../{discardCmd.expected.out => record_cmd.expected.out}   | 5 ++---
 test/Mathlib/test/{discardCmd.in => record_cmd.in}         | 2 +-
 test/{discardCmd.expected.out => record_cmd.expected.out}  | 0
 test/{discardCmd.in => record_cmd.in}                      | 2 +-
 .../{discardCmd2.expected.out => record_cmd2.expected.out} | 0
 test/{discardCmd2.in => record_cmd2.in}                    | 6 +++---
 ...md_proof.expected.out => record_cmd_state.expected.out} | 0
 test/{discardCmd_proof.in => record_cmd_state.in}          | 4 ++--
 11 files changed, 19 insertions(+), 19 deletions(-)
 rename test/Mathlib/test/{discardCmd.expected.out => record_cmd.expected.out} (93%)
 rename test/Mathlib/test/{discardCmd.in => record_cmd.in} (80%)
 rename test/{discardCmd.expected.out => record_cmd.expected.out} (100%)
 rename test/{discardCmd.in => record_cmd.in} (68%)
 rename test/{discardCmd2.expected.out => record_cmd2.expected.out} (100%)
 rename test/{discardCmd2.in => record_cmd2.in} (62%)
 rename test/{discardCmd_proof.expected.out => record_cmd_state.expected.out} (100%)
 rename test/{discardCmd_proof.in => record_cmd_state.in} (57%)

diff --git a/README.md b/README.md
index 3666fefe..e5798820 100644
--- a/README.md
+++ b/README.md
@@ -21,13 +21,13 @@ Commands may be of the form
 ```
 
 ```json
-{ "cmd" : "example : f = 2 := rfl", "env" : 1, "discard": true }
+{ "cmd" : "example : f = 2 := rfl", "env" : 1, "record": false }
 ```
 
 The input includes:
 * A required `cmd` field containing the Lean command to execute
 * An optional `env` field specifying a previous environment ID to build upon
-* An optional `discard` field (default: false) to discard the environment after execution
+* An optional `record` field (default: true) to record the environment after execution
 * Optional fields for additional information:
   * `allTactics`: when true, includes all tactic steps in the response
   * `rootGoals`: when true, includes root goals as sorries
@@ -46,7 +46,7 @@ You can backtrack simply by using earlier values for `env`.
 The response includes:
 * A numeric label for the `Environment` after your command,
   which you can use as the starting point for subsequent commands.
-  This will be `none` if `discard` was enabled.
+  This will be `none` if `record` was set to false.
 * Any messages generated while processing your command.
 * A list of the `sorry`s in your command, including
   * their expected type, and
diff --git a/REPL/JSON.lean b/REPL/JSON.lean
index c5d4781f..b7b3571f 100644
--- a/REPL/JSON.lean
+++ b/REPL/JSON.lean
@@ -23,13 +23,13 @@ structure CommandOptions where
 /-- Run Lean commands.
 If `env = none`, starts a new session (in which you can use `import`).
 If `env = some n`, builds on the existing environment `n`.
-Setting `discard = true` will discard the environment after execution, useful for memory management.
-When `discard = true`, the response's `env` field will be `none`.
+Setting `record = false` will discard the environment after execution, useful for memory management.
+When `record = false`, the response's `env` field will be `none`.
 -/
 structure Command extends CommandOptions where
   env : Option Nat
   cmd : String
-  discard : Option Bool := false
+  record : Option Bool := true
 deriving ToJson, FromJson
 
 /-- Process a Lean file in a fresh environment. -/
diff --git a/REPL/Main.lean b/REPL/Main.lean
index 529e80ad..d627e80c 100644
--- a/REPL/Main.lean
+++ b/REPL/Main.lean
@@ -322,11 +322,12 @@ def runCommand (s : Command) : M IO (CommandResponse ⊕ Error) := do
         fileMap := default,
         snap? := none,
         cancelTk? := none } }
-  let env ← match s.discard with
-  | some true => pure none
-  | _ => do
+  let env ← match s.record with
+  | some false => do pure none
+  | _ =>
     let id ← recordCommandSnapshot cmdSnapshot
     pure (some id)
+
   let jsonTrees := match s.infotree with
   | some "full" => trees
   | some "tactics" => trees.flatMap InfoTree.retainTacticInfo
diff --git a/test/Mathlib/test/discardCmd.expected.out b/test/Mathlib/test/record_cmd.expected.out
similarity index 93%
rename from test/Mathlib/test/discardCmd.expected.out
rename to test/Mathlib/test/record_cmd.expected.out
index 6182be78..7f30f1ce 100644
--- a/test/Mathlib/test/discardCmd.expected.out
+++ b/test/Mathlib/test/record_cmd.expected.out
@@ -9,8 +9,7 @@
  [{"severity": "warning",
    "pos": {"line": 1, "column": 8},
    "endPos": {"line": 1, "column": 30},
-   "data": "declaration uses 'sorry'"}],
- "env": 1}
+   "data": "declaration uses 'sorry'"}]}
 
 {"proofStatus": "Completed", "proofState": 1, "goals": []}
 
@@ -24,7 +23,7 @@
    "pos": {"line": 1, "column": 8},
    "endPos": {"line": 1, "column": 30},
    "data": "declaration uses 'sorry'"}],
- "env": 2}
+ "env": 1}
 
 {"proofStatus": "Completed", "proofState": 3, "goals": []}
 
diff --git a/test/Mathlib/test/discardCmd.in b/test/Mathlib/test/record_cmd.in
similarity index 80%
rename from test/Mathlib/test/discardCmd.in
rename to test/Mathlib/test/record_cmd.in
index ae2069e6..22dcb8a4 100644
--- a/test/Mathlib/test/discardCmd.in
+++ b/test/Mathlib/test/record_cmd.in
@@ -1,6 +1,6 @@
 {"cmd": "import Mathlib"}
 
-{"cmd": "theorem mathd_numbertheory_345 : (2000 + 2001 + 2002 + 2003 + 2004 + 2005 + 2006) % 7 = 0 := sorry", "env":0, "discard": true}
+{"cmd": "theorem mathd_numbertheory_345 : (2000 + 2001 + 2002 + 2003 + 2004 + 2005 + 2006) % 7 = 0 := sorry", "env":0, "record": false}
 
 {"tactic": "norm_num", "proofState": 0}
 
diff --git a/test/discardCmd.expected.out b/test/record_cmd.expected.out
similarity index 100%
rename from test/discardCmd.expected.out
rename to test/record_cmd.expected.out
diff --git a/test/discardCmd.in b/test/record_cmd.in
similarity index 68%
rename from test/discardCmd.in
rename to test/record_cmd.in
index bee0cfbf..8522b4c7 100644
--- a/test/discardCmd.in
+++ b/test/record_cmd.in
@@ -1,6 +1,6 @@
 {"cmd": "def f := 37"}
 
-{"cmd": "#eval true", "discard": true}
+{"cmd": "#eval true", "record": false}
 
 {"cmd": "#eval false", "env":1}
 
diff --git a/test/discardCmd2.expected.out b/test/record_cmd2.expected.out
similarity index 100%
rename from test/discardCmd2.expected.out
rename to test/record_cmd2.expected.out
diff --git a/test/discardCmd2.in b/test/record_cmd2.in
similarity index 62%
rename from test/discardCmd2.in
rename to test/record_cmd2.in
index ae7b296d..c71c23fb 100644
--- a/test/discardCmd2.in
+++ b/test/record_cmd2.in
@@ -2,8 +2,8 @@
 
 {"cmd": "example  : 2=2 := by\nrfl"}
 
-{"cmd": "theorem gc_demo (P Q R : Prop) : (P → Q) → (Q → R) → (P → R) := by", "discard": true}
+{"cmd": "theorem gc_demo (P Q R : Prop) : (P → Q) → (Q → R) → (P → R) := by", "record": false}
 
-{"cmd": "theorem gc_demo (P Q R : Prop) : (P → Q) → (Q → R) → (P → R) := by\nintro h1 h2 p", "discard": true}
+{"cmd": "theorem gc_demo (P Q R : Prop) : (P → Q) → (Q → R) → (P → R) := by\nintro h1 h2 p", "record": false}
 
-{"cmd": "theorem gc_demo (P Q R : Prop) : (P → Q) → (Q → R) → (P → R) := by\nintro h1 h2 p\napply?", "discard": true}
+{"cmd": "theorem gc_demo (P Q R : Prop) : (P → Q) → (Q → R) → (P → R) := by\nintro h1 h2 p\napply?", "record": false}
diff --git a/test/discardCmd_proof.expected.out b/test/record_cmd_state.expected.out
similarity index 100%
rename from test/discardCmd_proof.expected.out
rename to test/record_cmd_state.expected.out
diff --git a/test/discardCmd_proof.in b/test/record_cmd_state.in
similarity index 57%
rename from test/discardCmd_proof.in
rename to test/record_cmd_state.in
index cd8c8d99..6305934a 100644
--- a/test/discardCmd_proof.in
+++ b/test/record_cmd_state.in
@@ -1,6 +1,6 @@
-{"cmd": "example : 1=1 := by sorry", "discard": true}
+{"cmd": "example : 1=1 := by sorry", "record": false}
 
-{"cmd": "example : 1=1 := by sorry", "discard": false}
+{"cmd": "example : 1=1 := by sorry", "record": true}
 
 {"cmd": "example : 1=1 := by sorry"}
 

From edc50794fd2f14c3fd4a7a4359657b7ba0f560d6 Mon Sep 17 00:00:00 2001
From: rex <1073853456@qq.com>
Date: Wed, 16 Apr 2025 02:33:15 +0800
Subject: [PATCH 07/10] record for proof states

---
 REPL/JSON.lean |  5 +++--
 REPL/Main.lean | 10 ++++++----
 2 files changed, 9 insertions(+), 6 deletions(-)

diff --git a/REPL/JSON.lean b/REPL/JSON.lean
index b7b3571f..f3ef88bd 100644
--- a/REPL/JSON.lean
+++ b/REPL/JSON.lean
@@ -43,6 +43,7 @@ Run a tactic in a proof state.
 structure ProofStep where
   proofState : Nat
   tactic : String
+  record: Option Bool := true
 deriving ToJson, FromJson
 
 /-- Line and column information for error messages and sorries. -/
@@ -153,7 +154,7 @@ A response to a Lean tactic.
 `proofState` can be used in later calls, to run further tactics.
 -/
 structure ProofStepResponse where
-  proofState : Nat
+  proofState : Option Nat
   goals : List String
   messages : List Message := []
   sorries : List Sorry := []
@@ -163,7 +164,7 @@ deriving ToJson, FromJson
 
 instance : ToJson ProofStepResponse where
   toJson r := Json.mkObj <| .flatten [
-    [("proofState", r.proofState)],
+    Json.optField "proofState" r.proofState,
     [("goals", toJson r.goals)],
     Json.nonemptyList "messages" r.messages,
     Json.nonemptyList "sorries" r.sorries,
diff --git a/REPL/Main.lean b/REPL/Main.lean
index d627e80c..87077a15 100644
--- a/REPL/Main.lean
+++ b/REPL/Main.lean
@@ -230,8 +230,8 @@ def getProofStatus (proofState : ProofSnapshot) : M m String := do
     | _ => return "Incomplete: open goals remain"
 
 /-- Record a `ProofSnapshot` and generate a JSON response for it. -/
-def createProofStepReponse (proofState : ProofSnapshot) (old? : Option ProofSnapshot := none) :
-    M m ProofStepResponse := do
+def createProofStepReponse (proofState : ProofSnapshot) (old? : Option ProofSnapshot := none)
+  (record : Option Bool := true) : M m ProofStepResponse := do
   let messages := proofState.newMessages old?
   let messages ← messages.mapM fun m => Message.of m
   let traces ← proofState.newTraces old?
@@ -245,7 +245,9 @@ def createProofStepReponse (proofState : ProofSnapshot) (old? : Option ProofSnap
   -- For debugging purposes, sometimes we print out the trees here:
   -- trees.forM fun t => do IO.println (← t.format)
   let sorries ← sorries trees none (some proofState.rootGoals)
-  let id ← recordProofSnapshot proofState
+  let id ← match record with
+  | some false => pure none
+  | _ => some <$> recordProofSnapshot proofState
   return {
     proofState := id
     goals := (← proofState.ppGoals).map fun s => s!"{s}"
@@ -362,7 +364,7 @@ def runProofStep (s : ProofStep) : M IO (ProofStepResponse ⊕ Error) := do
   | some proofState =>
     try
       let proofState' ← proofState.runString s.tactic
-      return .inl (← createProofStepReponse proofState' proofState)
+      return .inl (← createProofStepReponse proofState' proofState s.record)
     catch ex =>
       return .inr ⟨"Lean error:\n" ++ ex.toString⟩
 

From b1cb4e73fdcc9f2064f1bc79d2d424c78c742ca9 Mon Sep 17 00:00:00 2001
From: rex <1073853456@qq.com>
Date: Sun, 4 May 2025 06:51:21 +0800
Subject: [PATCH 08/10] rename tests

---
 .../{record_cmd_state.expected.out => record_tactic.expected.out} | 0
 test/{record_cmd_state.in => record_tactic.in}                    | 0
 2 files changed, 0 insertions(+), 0 deletions(-)
 rename test/{record_cmd_state.expected.out => record_tactic.expected.out} (100%)
 rename test/{record_cmd_state.in => record_tactic.in} (100%)

diff --git a/test/record_cmd_state.expected.out b/test/record_tactic.expected.out
similarity index 100%
rename from test/record_cmd_state.expected.out
rename to test/record_tactic.expected.out
diff --git a/test/record_cmd_state.in b/test/record_tactic.in
similarity index 100%
rename from test/record_cmd_state.in
rename to test/record_tactic.in

From d374f1b8dd36358c22dafa81f2215b418ebe71a6 Mon Sep 17 00:00:00 2001
From: rex <1073853456@qq.com>
Date: Fri, 4 Jul 2025 16:13:22 +0800
Subject: [PATCH 09/10] update test scripts

---
 test.sh              | 25 +++++++++++++++++++++++--
 test/Mathlib/test.sh | 21 +++++++++++++++++++--
 2 files changed, 42 insertions(+), 4 deletions(-)

diff --git a/test.sh b/test.sh
index be8e1b3f..0af7e5e3 100755
--- a/test.sh
+++ b/test.sh
@@ -6,6 +6,10 @@ EXPECTED_DIR="test"
 
 lake build
 
+# Initialize variables to track failures
+failed_tests=()
+failure_count=0
+
 # ignore locale to ensure test `bla` runs before `bla2`
 export LC_COLLATE=C
 
@@ -36,11 +40,28 @@ for infile in $IN_DIR/*.in; do
         echo "$base: FAILED"
         # Rename the temporary file instead of removing it
         mv "$tmpfile" "${expectedfile/.expected.out/.produced.out}"
-        exit 1
+        failed_tests+=("$base")
+        ((failure_count++))
     fi
-
 done
 
+# Print summary of failures
+if [ ${#failed_tests[@]} -ne 0 ]; then
+    echo -e "\n=== Test Summary ==="
+    echo "Failed tests:"
+    for test in "${failed_tests[@]}"; do
+        echo "✗ $test"
+    done
+    echo -e "\nTotal: $failure_count failed"
+    echo "=================="
+fi
+
 # Run the Mathlib tests
 cp lean-toolchain test/Mathlib/
 cd test/Mathlib/ && ./test.sh
+mathlib_exit_code=$?
+
+# Exit with error if any test failed or if Mathlib tests failed
+if [ $failure_count -gt 0 ] || [ $mathlib_exit_code -ne 0 ]; then
+    exit 1
+fi
diff --git a/test/Mathlib/test.sh b/test/Mathlib/test.sh
index 0f9f89fe..b1f220df 100755
--- a/test/Mathlib/test.sh
+++ b/test/Mathlib/test.sh
@@ -4,6 +4,10 @@
 IN_DIR="test"
 EXPECTED_DIR="test"
 
+# Initialize variables to track failures
+failed_tests=()
+failure_count=0
+
 lake exe cache get > /dev/null
 lake build Mathlib
 
@@ -34,8 +38,21 @@ for infile in $IN_DIR/*.in; do
         echo "$base: FAILED"
         # Rename the temporary file instead of removing it
         mv "$tmpfile" "${expectedfile/.expected.out/.produced.out}"
-        exit 1
+        failed_tests+=("$base")
+        ((failure_count++))
     fi
-
 done
 
+# Print summary of failures
+if [ ${#failed_tests[@]} -ne 0 ]; then
+    echo -e "\n=== Mathlib Test Summary ==="
+    echo "Failed tests:"
+    for test in "${failed_tests[@]}"; do
+        echo "✗ $test"
+    done
+    echo -e "\nTotal: $failure_count failed"
+    echo "========================"
+    exit 1
+fi
+
+exit 0

From 3d719445fc842990da20f038d87a4839eac07dcd Mon Sep 17 00:00:00 2001
From: rex <1073853456@qq.com>
Date: Thu, 24 Jul 2025 04:29:19 +0800
Subject: [PATCH 10/10] fix error test

---
 test/record_cmd2.expected.out | 13 ++-----------
 1 file changed, 2 insertions(+), 11 deletions(-)

diff --git a/test/record_cmd2.expected.out b/test/record_cmd2.expected.out
index d76ff33b..f581d6cf 100644
--- a/test/record_cmd2.expected.out
+++ b/test/record_cmd2.expected.out
@@ -9,12 +9,7 @@
    "data": "unsolved goals\n⊢ 2 = 2"}],
  "env": 0}
 
-{"messages":
- [{"severity": "info",
-   "pos": {"line": 1, "column": 0},
-   "endPos": {"line": 2, "column": 3},
-   "data": "Goals accomplished!"}],
- "env": 1}
+{"env": 1}
 
 {"messages":
  [{"severity": "error",
@@ -36,9 +31,5 @@
  [{"severity": "info",
    "pos": {"line": 3, "column": 0},
    "endPos": {"line": 3, "column": 6},
-   "data": "Try this: exact h2 (h1 p)"},
-  {"severity": "info",
-   "pos": {"line": 1, "column": 0},
-   "endPos": {"line": 3, "column": 6},
-   "data": "Goals accomplished!"}]}
+   "data": "Try this: exact h2 (h1 p)"}]}