Remove change from v1, add Changelog and documentation

CHANGELOG.md

@@ -7,6 +7,10 @@
 * Start showing inlined functions in stack trace
   [#208](https://github.com/bugsnag/bugsnag-go/pull/208)
 
+* Stop trimming everything before "main.go" on main packages
+  [#217](https://github.com/bugsnag/bugsnag-go/pull/217)
+  [Chris Duncan](https://github.com/veqryn)
+
 ## 2.2.0 (2022-10-12)
 
 ### Enhancements

event.go

@@ -198,7 +198,7 @@ func generateStacktrace(err *errors.Error, config *Configuration) []StackFrame {
 		inProject := config.isProjectPackage(frame.Package)
 
 		// remove $GOROOT and $GOHOME from other frames
-		if idx := strings.Index(file, frame.Package); idx > -1 && frame.Package != "main" {
+		if idx := strings.Index(file, frame.Package); idx > -1 {
 			file = file[idx:]
 		}
 		if inProject {

v2/configuration.go

@@ -232,10 +232,7 @@ func (config *Configuration) isProjectPackage(_pkg string) bool {
 }
 
 func (config *Configuration) stripProjectPackages(file string) string {
-	trimmedFile := file
-	if strings.HasPrefix(trimmedFile, config.SourceRoot) {
-		trimmedFile = strings.TrimPrefix(trimmedFile, config.SourceRoot)
-	}
+	trimmedFile := strings.TrimPrefix(file, config.SourceRoot)
 	for _, p := range config.ProjectPackages {
 		if len(p) > 2 && p[len(p)-2] == '/' && p[len(p)-1] == '*' {
 			p = p[:len(p)-1]

v2/event.go

@@ -197,10 +197,19 @@ func generateStacktrace(err *errors.Error, config *Configuration) []StackFrame {
 		file := frame.File
 		inProject := config.isProjectPackage(frame.Package)
 
-		// remove $GOROOT and $GOHOME from other frames
+		// This will trim path before package name for external packages and golang default packages
+		// Excluding main package as it's special case
+		// This will NOT trim paths for packages in current module because path won't contain the package name
+		// Example: path is "/user/name/work/internal/internal.go" and module package name is "example.com/mymodule/internal"
 		if idx := strings.Index(file, frame.Package); idx > -1 && frame.Package != "main" {
 			file = file[idx:]
 		}
+
+		// This should trim path for main and other current module packages with correct config
+		// If input path is "/user/name/work/internal/internal.go"
+		// SourceRoot is "/user/name/work" and ProjectPackages are []string{"main*", "example.com/mymodule/**"}
+		// Then when package name is "example.com/mymodule/internal"
+		// The path will be trimmed to "/internal/internal.go"
 		if inProject {
 			file = config.stripProjectPackages(file)
 		}