Function parseTemplateExecutingAtErrorType

pkg/engine/engine.go:412–448

Executing form: " : executing \" \" at < >: [ template:...]" Matches https://cs.opensource.google/go/go/+/refs/tags/go1.23.6:src/text/template/exec.go;l=141

(remainder string)

// Executing form: "<templateName>: executing \"<funcName>\" at <<location>>: <errMsg>[ template:...]"
// Matches https://cs.opensource.google/go/go/+/refs/tags/go1.23.6:src/text/template/exec.go;l=141
func parseTemplateExecutingAtErrorType(remainder string) (TraceableError, bool) {
	if templateName, after, found := strings.Cut(remainder, ": executing "); found {
		if len(after) == 0 || after[0] != '"' {
			return TraceableError{}, false
		}
		// find closing quote for function name
		endQuote := strings.IndexByte(after[1:], '"')
		if endQuote == -1 {
			return TraceableError{}, false
		}
		endQuote++ // account for offset we started at 1
		functionName := after[1:endQuote]
		afterFunc := after[endQuote+1:]

		// expect: " at <" then location then ">: " then message
		const atPrefix = " at <"
		if !strings.HasPrefix(afterFunc, atPrefix) {
			return TraceableError{}, false
		}
		afterAt := afterFunc[len(atPrefix):]
		locationName, errMsg, found := strings.Cut(afterAt, ">: ")
		if !found {
			return TraceableError{}, false
		}

		// trim chained next error starting with space + "template:" if present
		if cut := strings.Index(errMsg, " template:"); cut != -1 {
			errMsg = errMsg[:cut]
		}
		return TraceableError{
			location:         templateName,
			message:          errMsg,
			executedFunction: "executing \"" + functionName + "\" at <" + locationName + ">:",
		}, true
	}
	return TraceableError{}, false
}

// reformatExecErrorMsg takes an error message for template rendering and formats it into a formatted
// multi-line error string