simplify de-duplication code

This is a follow-up which removes several functions which don't provide enough
additional value anymore. This wasn't done earlier to keep the previous commits
simple.

internal/serialize/keyvalues.go

@@ -58,35 +58,15 @@ type Formatter struct {
 
 type AnyToStringFunc func(v interface{}) string
 
-// MergeKVsInto is a variant of MergeKVs which directly formats the key/value
-// pairs into a buffer.
-func (f Formatter) MergeAndFormatKVs(b *bytes.Buffer, first, second []interface{}) {
-	f.formatKVs(b, first, second)
-}
-
-func MergeAndFormatKVs(b *bytes.Buffer, first, second []interface{}) {
-	Formatter{}.MergeAndFormatKVs(b, first, second)
-}
-
 const missingValue = "(MISSING)"
 
-// KVListFormat serializes all key/value pairs into the provided buffer.
-// A space gets inserted before the first pair and between each pair.
-func (f Formatter) KVListFormat(b *bytes.Buffer, keysAndValues ...interface{}) {
-	f.formatKVs(b, keysAndValues)
-}
-
-func KVListFormat(b *bytes.Buffer, keysAndValues ...interface{}) {
-	Formatter{}.KVListFormat(b, keysAndValues...)
-}
-
-func KVFormat(b *bytes.Buffer, k, v interface{}) {
-	Formatter{}.KVFormat(b, k, v)
+func FormatKVs(b *bytes.Buffer, kvs ...[]interface{}) {
+	Formatter{}.FormatKVs(b, kvs...)
 }
 
-// formatKVs formats all key/value pairs such that the output contains no
+// FormatKVs formats all key/value pairs such that the output contains no
 // duplicates ("last one wins").
-func (f Formatter) formatKVs(b *bytes.Buffer, kvs ...[]interface{}) {
+func (f Formatter) FormatKVs(b *bytes.Buffer, kvs ...[]interface{}) {
 	// De-duplication is done by optimistically formatting all key value
 	// pairs and then cutting out the output of those key/value pairs which
 	// got overwritten later.

internal/serialize/keyvalues_test.go

@@ -184,7 +184,7 @@ No whitespace.`,
 
 	for _, d := range testKVList {
 		b := &bytes.Buffer{}
-		serialize.KVListFormat(b, d.keysValues...)
+		serialize.FormatKVs(b, d.keysValues)
 		if b.String() != d.want {
 			t.Errorf("KVListFormat error:\n got:\n\t%s\nwant:\t%s", b.String(), d.want)
 		}

klog.go

@@ -819,10 +819,11 @@ func (l *loggingT) printS(err error, s severity.Severity, depth int, msg string,
 	b := buffer.GetBuffer()
 	b.Write(qMsg)
 
+	var errKV []interface{}
 	if err != nil {
-		serialize.KVListFormat(&b.Buffer, "err", err)
+		errKV = []interface{}{"err", err}
 	}
-	serialize.KVListFormat(&b.Buffer, keysAndValues...)
+	serialize.FormatKVs(&b.Buffer, errKV, keysAndValues)
 	l.printDepth(s, nil, nil, depth+1, &b.Buffer)
 	// Make the buffer available for reuse.
 	buffer.PutBuffer(b)

klogr_slog.go

@@ -69,10 +69,11 @@ func slogOutput(file string, line int, now time.Time, err error, s severity.Seve
 	b := buffer.GetBuffer()
 	b.Write(qMsg)
 
+	var errKV []interface{}
 	if err != nil {
-		serialize.KVListFormat(&b.Buffer, "err", err)
+		errKV = []interface{}{"err", err}
 	}
-	serialize.KVListFormat(&b.Buffer, kvList...)
+	serialize.FormatKVs(&b.Buffer, errKV, kvList)
 
 	// See print + header.
 	buf := logging.formatHeader(s, file, line, now)

ktesting/testinglogger.go

@@ -302,7 +302,7 @@ func (l tlogger) Info(level int, msg string, kvList ...interface{}) {
 
 	l.shared.t.Helper()
 	buf := buffer.GetBuffer()
-	l.shared.formatter.MergeAndFormatKVs(&buf.Buffer, l.values, kvList)
+	l.shared.formatter.FormatKVs(&buf.Buffer, l.values, kvList)
 	l.log(LogInfo, msg, level, buf, nil, kvList)
 }
 
@@ -320,10 +320,11 @@ func (l tlogger) Error(err error, msg string, kvList ...interface{}) {
 
 	l.shared.t.Helper()
 	buf := buffer.GetBuffer()
+	var errKV []interface{}
 	if err != nil {
-		l.shared.formatter.KVFormat(&buf.Buffer, "err", err)
+		errKV = []interface{}{"err", err}
 	}
-	l.shared.formatter.MergeAndFormatKVs(&buf.Buffer, l.values, kvList)
+	l.shared.formatter.FormatKVs(&buf.Buffer, errKV, l.values, kvList)
 	l.log(LogError, msg, 0, buf, err, kvList)
 }
 

textlogger/textlogger.go

@@ -132,10 +132,11 @@ func (l *tlogger) printWithInfos(file string, line int, now time.Time, err error
 
 	b.Write(qMsg)
 
+	var errKV []interface{}
 	if err != nil {
-		serialize.KVFormat(&b.Buffer, "err", err)
+		errKV = []interface{}{"err", err}
 	}
-	serialize.MergeAndFormatKVs(&b.Buffer, l.values, kvList)
+	serialize.FormatKVs(&b.Buffer, errKV, l.values, kvList)
 	if b.Len() == 0 || b.Bytes()[b.Len()-1] != '\n' {
 		b.WriteByte('\n')
 	}