migrate Go func, func name, and lambda to treesitter (#1756)

The previous definitions were mostly correct,
although they were missing the possibility
of declaring a function without a body.
(Understandably. They are rare.)
See the end of https://go.dev/ref/spec#Function_declarations.



## Checklist

- [x] I have added
[tests](https://www.cursorless.org/docs/contributing/test-case-recorder/)
- [/] I have updated the
[docs](https://github.com/cursorless-dev/cursorless/tree/main/docs) and
[cheatsheet](https://github.com/cursorless-dev/cursorless/tree/main/cursorless-talon/src/cheatsheet)
- [/] I have not broken the cheatsheet

data/playground/go/funcs.go

@@ -0,0 +1,29 @@
+package p
+
+func plainOldFunction() {
+	go func() {
+		// anonymous function
+	}()
+	_ = func() string {
+		return "x"
+	}
+}
+
+func genericFunction[T int | int64](x T) T {
+	if x == 0 {
+		panic("zero")
+	}
+	return x
+}
+
+func (a A) method() {
+	defer func() {
+		recover()
+	}()
+	[]func(){
+		func() { panic(0) },
+		func() { panic(1) },
+	}[a[0].(int)]()
+}
+
+func stub() string

packages/cursorless-engine/src/languages/go.ts

@@ -14,16 +14,13 @@ const nodeMatchers: Partial<
   ifStatement: "if_statement",
   functionCall: ["call_expression", "composite_literal"],
   functionCallee: ["call_expression[function]", "composite_literal[type]"],
-  namedFunction: ["function_declaration", "method_declaration"],
   type: [
     "pointer_type",
     "qualified_type",
     "type_identifier",
     "function_declaration[result]",
     "method_declaration[result]",
   ],
-  functionName: ["function_declaration[name]", "method_declaration[name]"],
-  anonymousFunction: "func_literal",
   condition: conditionMatcher("*[condition]"),
   argumentOrParameter: cascadingMatcher(
     argumentMatcher("argument_list", "parameter_list"),

packages/cursorless-vscode-e2e/src/suite/fixtures/recorded/languages/go/changeFunk.yml

@@ -0,0 +1,23 @@
+languageId: go
+command:
+  version: 6
+  spokenForm: change funk
+  action:
+    name: clearAndSetSelection
+    target:
+      type: primitive
+      modifiers:
+        - type: containingScope
+          scopeType: {type: namedFunction}
+  usePrePhraseSnapshot: true
+initialState:
+  documentContents: _ = func() { /* body */ }
+  selections:
+    - anchor: {line: 0, character: 25}
+      active: {line: 0, character: 25}
+  marks: {}
+finalState:
+  documentContents: "_ = "
+  selections:
+    - anchor: {line: 0, character: 4}
+      active: {line: 0, character: 4}

packages/cursorless-vscode-e2e/src/suite/fixtures/recorded/languages/go/changeFunkAir.yml

@@ -0,0 +1,27 @@
+languageId: go
+command:
+  version: 6
+  spokenForm: change funk air
+  action:
+    name: clearAndSetSelection
+    target:
+      type: primitive
+      modifiers:
+        - type: containingScope
+          scopeType: {type: namedFunction}
+      mark: {type: decoratedSymbol, symbolColor: default, character: a}
+  usePrePhraseSnapshot: true
+initialState:
+  documentContents: func f[X any]() { /* body */ }
+  selections:
+    - anchor: {line: 0, character: 30}
+      active: {line: 0, character: 30}
+  marks:
+    default.a:
+      start: {line: 0, character: 9}
+      end: {line: 0, character: 12}
+finalState:
+  documentContents: ""
+  selections:
+    - anchor: {line: 0, character: 0}
+      active: {line: 0, character: 0}

packages/cursorless-vscode-e2e/src/suite/fixtures/recorded/languages/go/changeFunkBat.yml

@@ -0,0 +1,27 @@
+languageId: go
+command:
+  version: 6
+  spokenForm: change funk bat
+  action:
+    name: clearAndSetSelection
+    target:
+      type: primitive
+      modifiers:
+        - type: containingScope
+          scopeType: {type: namedFunction}
+      mark: {type: decoratedSymbol, symbolColor: default, character: b}
+  usePrePhraseSnapshot: true
+initialState:
+  documentContents: func f() { /* body */ }
+  selections:
+    - anchor: {line: 0, character: 18}
+      active: {line: 0, character: 18}
+  marks:
+    default.b:
+      start: {line: 0, character: 14}
+      end: {line: 0, character: 18}
+finalState:
+  documentContents: ""
+  selections:
+    - anchor: {line: 0, character: 0}
+      active: {line: 0, character: 0}

packages/cursorless-vscode-e2e/src/suite/fixtures/recorded/languages/go/changeFunkBat2.yml

@@ -0,0 +1,27 @@
+languageId: go
+command:
+  version: 6
+  spokenForm: change funk bat
+  action:
+    name: clearAndSetSelection
+    target:
+      type: primitive
+      modifiers:
+        - type: containingScope
+          scopeType: {type: namedFunction}
+      mark: {type: decoratedSymbol, symbolColor: default, character: b}
+  usePrePhraseSnapshot: true
+initialState:
+  documentContents: func (t T) f() { /* body */ }
+  selections:
+    - anchor: {line: 0, character: 29}
+      active: {line: 0, character: 29}
+  marks:
+    default.b:
+      start: {line: 0, character: 20}
+      end: {line: 0, character: 24}
+finalState:
+  documentContents: ""
+  selections:
+    - anchor: {line: 0, character: 0}
+      active: {line: 0, character: 0}

packages/cursorless-vscode-e2e/src/suite/fixtures/recorded/languages/go/changeFunkFine.yml

@@ -0,0 +1,27 @@
+languageId: go
+command:
+  version: 6
+  spokenForm: change funk fine
+  action:
+    name: clearAndSetSelection
+    target:
+      type: primitive
+      modifiers:
+        - type: containingScope
+          scopeType: {type: namedFunction}
+      mark: {type: decoratedSymbol, symbolColor: default, character: f}
+  usePrePhraseSnapshot: true
+initialState:
+  documentContents: func f() { /* body */ }
+  selections:
+    - anchor: {line: 0, character: 18}
+      active: {line: 0, character: 18}
+  marks:
+    default.f:
+      start: {line: 0, character: 5}
+      end: {line: 0, character: 6}
+finalState:
+  documentContents: ""
+  selections:
+    - anchor: {line: 0, character: 0}
+      active: {line: 0, character: 0}

packages/cursorless-vscode-e2e/src/suite/fixtures/recorded/languages/go/changeFunkFine2.yml

@@ -0,0 +1,27 @@
+languageId: go
+command:
+  version: 6
+  spokenForm: change funk fine
+  action:
+    name: clearAndSetSelection
+    target:
+      type: primitive
+      modifiers:
+        - type: containingScope
+          scopeType: {type: namedFunction}
+      mark: {type: decoratedSymbol, symbolColor: default, character: f}
+  usePrePhraseSnapshot: true
+initialState:
+  documentContents: func (t T) f() { /* body */ }
+  selections:
+    - anchor: {line: 0, character: 29}
+      active: {line: 0, character: 29}
+  marks:
+    default.f:
+      start: {line: 0, character: 11}
+      end: {line: 0, character: 12}
+finalState:
+  documentContents: ""
+  selections:
+    - anchor: {line: 0, character: 0}
+      active: {line: 0, character: 0}

packages/cursorless-vscode-e2e/src/suite/fixtures/recorded/languages/go/changeFunkFine3.yml

@@ -0,0 +1,27 @@
+languageId: go
+command:
+  version: 6
+  spokenForm: change funk fine
+  action:
+    name: clearAndSetSelection
+    target:
+      type: primitive
+      modifiers:
+        - type: containingScope
+          scopeType: {type: namedFunction}
+      mark: {type: decoratedSymbol, symbolColor: default, character: f}
+  usePrePhraseSnapshot: true
+initialState:
+  documentContents: func f()
+  selections:
+    - anchor: {line: 0, character: 8}
+      active: {line: 0, character: 8}
+  marks:
+    default.f:
+      start: {line: 0, character: 5}
+      end: {line: 0, character: 6}
+finalState:
+  documentContents: ""
+  selections:
+    - anchor: {line: 0, character: 0}
+      active: {line: 0, character: 0}

packages/cursorless-vscode-e2e/src/suite/fixtures/recorded/languages/go/changeFunkNameBat.yml

@@ -0,0 +1,27 @@
+languageId: go
+command:
+  version: 6
+  spokenForm: change funk name bat
+  action:
+    name: clearAndSetSelection
+    target:
+      type: primitive
+      modifiers:
+        - type: containingScope
+          scopeType: {type: functionName}
+      mark: {type: decoratedSymbol, symbolColor: default, character: b}
+  usePrePhraseSnapshot: true
+initialState:
+  documentContents: func f() { /* body */ }
+  selections:
+    - anchor: {line: 0, character: 18}
+      active: {line: 0, character: 18}
+  marks:
+    default.b:
+      start: {line: 0, character: 14}
+      end: {line: 0, character: 18}
+finalState:
+  documentContents: func () { /* body */ }
+  selections:
+    - anchor: {line: 0, character: 5}
+      active: {line: 0, character: 5}

packages/cursorless-vscode-e2e/src/suite/fixtures/recorded/languages/go/changeFunkNameFine.yml

@@ -0,0 +1,27 @@
+languageId: go
+command:
+  version: 6
+  spokenForm: change funk name fine
+  action:
+    name: clearAndSetSelection
+    target:
+      type: primitive
+      modifiers:
+        - type: containingScope
+          scopeType: {type: functionName}
+      mark: {type: decoratedSymbol, symbolColor: default, character: f}
+  usePrePhraseSnapshot: true
+initialState:
+  documentContents: func f() { /* body */ }
+  selections:
+    - anchor: {line: 0, character: 18}
+      active: {line: 0, character: 18}
+  marks:
+    default.f:
+      start: {line: 0, character: 5}
+      end: {line: 0, character: 6}
+finalState:
+  documentContents: func () { /* body */ }
+  selections:
+    - anchor: {line: 0, character: 5}
+      active: {line: 0, character: 5}

packages/cursorless-vscode-e2e/src/suite/fixtures/recorded/languages/go/changeFunkTrap.yml

@@ -0,0 +1,27 @@
+languageId: go
+command:
+  version: 6
+  spokenForm: change funk trap
+  action:
+    name: clearAndSetSelection
+    target:
+      type: primitive
+      modifiers:
+        - type: containingScope
+          scopeType: {type: namedFunction}
+      mark: {type: decoratedSymbol, symbolColor: default, character: t}
+  usePrePhraseSnapshot: true
+initialState:
+  documentContents: func (t T) f() { /* body */ }
+  selections:
+    - anchor: {line: 0, character: 29}
+      active: {line: 0, character: 29}
+  marks:
+    default.t:
+      start: {line: 0, character: 8}
+      end: {line: 0, character: 9}
+finalState:
+  documentContents: ""
+  selections:
+    - anchor: {line: 0, character: 0}
+      active: {line: 0, character: 0}

packages/cursorless-vscode-e2e/src/suite/fixtures/recorded/languages/go/changeInsideFunk.yml

@@ -0,0 +1,24 @@
+languageId: go
+command:
+  version: 6
+  spokenForm: change inside funk
+  action:
+    name: clearAndSetSelection
+    target:
+      type: primitive
+      modifiers:
+        - {type: interiorOnly}
+        - type: containingScope
+          scopeType: {type: namedFunction}
+  usePrePhraseSnapshot: true
+initialState:
+  documentContents: "func (t T) f() {\n\t_ = 1\n}"
+  selections:
+    - anchor: {line: 1, character: 6}
+      active: {line: 1, character: 6}
+  marks: {}
+finalState:
+  documentContents: "func (t T) f() {\n\t\n}"
+  selections:
+    - anchor: {line: 1, character: 1}
+      active: {line: 1, character: 1}

packages/cursorless-vscode-e2e/src/suite/fixtures/recorded/languages/go/changeInsideFunkBat.yml

@@ -0,0 +1,28 @@
+languageId: go
+command:
+  version: 6
+  spokenForm: change inside funk bat
+  action:
+    name: clearAndSetSelection
+    target:
+      type: primitive
+      modifiers:
+        - {type: interiorOnly}
+        - type: containingScope
+          scopeType: {type: namedFunction}
+      mark: {type: decoratedSymbol, symbolColor: default, character: b}
+  usePrePhraseSnapshot: true
+initialState:
+  documentContents: func f() { /* body */ }
+  selections:
+    - anchor: {line: 0, character: 18}
+      active: {line: 0, character: 18}
+  marks:
+    default.b:
+      start: {line: 0, character: 14}
+      end: {line: 0, character: 18}
+finalState:
+  documentContents: func f() {  }
+  selections:
+    - anchor: {line: 0, character: 11}
+      active: {line: 0, character: 11}