start reworking exporters to be more composable

pkg/code_location/code_location.go

@@ -1,13 +1,28 @@
 package code_location
 
+import (
+	"runtime"
+)
+
 type CodeLocation struct {
-	FilePath string
-	FuncName string
-	LineNumber int
+	FilePath     string
+	FuncName     string
+	LineNumber   int
 	ColumnNumber int
 }
 
-func FromStackTrace(...atDepth int) {
+func FromStackTrace(atDepth ...int) CodeLocation {
+	skipLevelsInCallStack := 0
+
+	if len(atDepth) > 1 {
+		skipLevelsInCallStack = atDepth[0]
+	}
 	pc, file, line, _ := runtime.Caller(1 + skipLevelsInCallStack)
 	funcName := runtime.FuncForPC(pc).Name()
+
+	return CodeLocation{
+		FilePath:   file,
+		LineNumber: line,
+		FuncName:   funcName,
+	}
 }