feat: implement autofix to delete entire line of .Finish() (#11)

Makefile

@@ -2,3 +2,6 @@
 
 test:
 	@go test -race -v ./...
+
+build:
+	@go build -o gomocklinter main.go

README.md

@@ -23,6 +23,30 @@ $ go build -o gomocklinter main.go
 $ go vet -vettool=./gomocklinter ./...
 ```
 
+### Autofix
+
+Autofix is supported that will delete the entire line with `.Finish()` call to `gomock.Controller`  
+
+```
+$ ./gomocklinter -fix ./...
+```
+
+Please note that, there may be some adjustments need to be done by hand after this action
+
+```
+// Before
+func TestFoo(t *testing.T) {
+	ctrl := gomock.NewController(t)
+	defer ctrl.Finish() // will be deleted entirely
+}
+
+// After
+func TestFoo(t *testing.T) {
+	ctrl := gomock.NewController(t)	
+}
+```
+
+
 ## Motivation
 As highlighted in https://pkg.go.dev/github.com/golang/mock/gomock#NewController
 
@@ -32,12 +56,12 @@ As highlighted in https://pkg.go.dev/github.com/golang/mock/gomock#NewController
 ```
 // Bad
 func TestFoo(t *testing.T) {
-	mock := gomock.NewController(t)
-	defer mock.Finish() // no need to call this since go1.14
+	ctrl := gomock.NewController(t)
+	defer ctrl.Finish() // no need to call this since go1.14
 }
 
 // Good
 func TestFoo(t *testing.T) {
-	mock := gomock.NewController(t)	
+	ctrl := gomock.NewController(t)
 }
 ```

pkg/analyzer/analyzer.go

@@ -53,7 +53,40 @@ func run(pass *analysis.Pass) (interface{}, error) {
 
 		// check for unnecessary call to gomock.Controller.Finish()
 		if isValidType(pass.TypesInfo.TypeOf(selIdent).String()) && selectorExpr.Sel.Name == finish {
-			pass.Reportf(callExpr.Pos(), reportMsg)
+			// Get the token.File associated with the callExpr
+			f := pass.Fset.File(callExpr.Pos())
+
+			// Get the line number of the callExpr
+			line := f.Line(callExpr.Pos())
+
+			// Get the start position of the line
+			lineStartPos := f.LineStart(line)
+
+			// Get the start position of the next line
+			nextLineStartPos := f.LineStart(line + 1)
+
+			// Calculate the end position of the line
+			lineEndPos := nextLineStartPos - 1
+
+			// Create a fix to delete the line
+			fix := analysis.SuggestedFix{
+				Message: "Remove unnecessary call to Finish",
+				TextEdits: []analysis.TextEdit{
+					{
+						Pos:     lineStartPos,
+						End:     lineEndPos,
+						NewText: []byte(""),
+					},
+				},
+			}
+
+			// Add the fix to the diagnostic report
+			diagnostic := analysis.Diagnostic{
+				Pos:            callExpr.Pos(),
+				Message:        reportMsg,
+				SuggestedFixes: []analysis.SuggestedFix{fix},
+			}
+			pass.Report(diagnostic)
 		}
 	})