first commit

output/writer/output.go

@@ -0,0 +1,44 @@
+package writer
+
+import (
+	"bytes"
+	"context"
+	"fmt"
+	"io"
+	"os"
+	"strings"
+
+	"gitoa.ru/go-4devs/console/output"
+)
+
+func Stderr() output.Output {
+	return New(os.Stderr, String)
+}
+
+func Stdout() output.Output {
+	return New(os.Stdout, String)
+}
+
+func Buffer(buf *bytes.Buffer) output.Output {
+	return New(buf, String)
+}
+
+func String(_ output.Verbosity, msg string, kv ...output.KeyValue) string {
+	if len(kv) > 0 {
+		newline := ""
+		if msg[len(msg)-1:] == "\n" {
+			newline = "\n"
+		}
+
+		return "msg=\"" + strings.TrimSpace(msg) + "\", " + output.KeyValues(kv).String() + newline
+
+	}
+
+	return msg
+}
+
+func New(w io.Writer, format func(verb output.Verbosity, msg string, kv ...output.KeyValue) string) output.Output {
+	return func(ctx context.Context, verb output.Verbosity, msg string, kv ...output.KeyValue) (int, error) {
+		return fmt.Fprint(w, format(verb, msg, kv...))
+	}
+}

output/writer/output_test.go

@@ -0,0 +1,49 @@
+package writer_test
+
+import (
+	"bytes"
+	"context"
+	"testing"
+
+	"gitoa.ru/go-4devs/console/output"
+	"gitoa.ru/go-4devs/console/output/writer"
+)
+
+func TestNew(t *testing.T) {
+	ctx := context.Background()
+	buf := bytes.Buffer{}
+	wr := writer.New(&buf, writer.String)
+
+	cases := map[string]struct {
+		ex string
+		kv []output.KeyValue
+	}{
+		"message": {
+			ex: "message",
+		},
+		"msg with kv": {
+			ex: "msg=\"msg with kv\", string key=\"string value\", bool key=\"false\", int key=\"42\"",
+			kv: []output.KeyValue{
+				output.String("string key", "string value"),
+				output.Bool("bool key", false),
+				output.Int("int key", 42),
+			},
+		},
+		"msg with newline \n": {
+			ex: "msg=\"msg with newline\", int=\"42\"\n",
+			kv: []output.KeyValue{
+				output.Int("int", 42),
+			},
+		},
+	}
+
+	for msg, data := range cases {
+		wr.InfoKV(ctx, msg, data.kv...)
+
+		if data.ex != buf.String() {
+			t.Errorf("message not equals expext:%s, got:%s", data.ex, buf.String())
+		}
+
+		buf.Reset()
+	}
+}