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formatter.go
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/
formatter.go
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//
// DISCLAIMER
//
// Copyright 2020 ArangoDB GmbH, Cologne, Germany
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// Copyright holder is ArangoDB GmbH, Cologne, Germany
//
// Author Ewout Prangsma
//
package format
import (
"encoding/json"
"fmt"
"reflect"
"sort"
"strings"
"time"
"github.com/dustin/go-humanize"
"github.com/gogo/protobuf/types"
"github.com/ryanuber/columnize"
)
type kv struct {
Key string
Value interface{}
}
var (
singleConfig = &columnize.Config{
Delim: "|^|",
Glue: " ",
Prefix: "",
Empty: "",
}
listConfig = &columnize.Config{
Delim: "|^|",
Glue: " | ",
Prefix: "",
Empty: "",
}
)
// formatObject returns a formatted representation of the given
// data which is a map from field-name to value.
func formatObject(opts Options, data ...kv) string {
if opts.Format == formatJSON {
m := make(map[string]interface{}, len(data))
for _, kv := range data {
m[kv.Key] = kv.Value
}
encoded, err := json.MarshalIndent(m, "", " ")
if err != nil {
panic(err)
}
return string(encoded)
}
// Table
lines := make([]string, 0, len(data))
for _, kv := range data {
title := strings.Title(kv.Key)
lines = append(lines, fmt.Sprintf("%s |^| %v", title, kv.Value))
}
return columnize.Format(lines, singleConfig)
}
// formatList returns a formatted representation of the given
// list.
func formatList(opts Options, list interface{}, getData func(int) []kv, noSort bool) string {
listv := reflect.ValueOf(list)
length := listv.Len()
if opts.Format == formatJSON {
l := make([]map[string]interface{}, length)
for i := 0; i < length; i++ {
data := getData(i)
m := make(map[string]interface{})
l[i] = m
for _, kv := range data {
m[kv.Key] = kv.Value
}
}
encoded, err := json.MarshalIndent(l, "", " ")
if err != nil {
panic(err)
}
return string(encoded)
}
// Table
if length == 0 {
return "None"
}
lines := make([]string, 0, length+2)
for i := 0; i < length; i++ {
data := getData(i)
row := make([]string, 0, len(data))
if i == 0 {
for _, kv := range data {
row = append(row, strings.Title(kv.Key))
}
lines = append(lines, strings.Join(row, "|^|"))
row = row[:0]
}
for _, kv := range data {
row = append(row, fmt.Sprintf("%v", kv.Value))
}
lines = append(lines, strings.Join(row, "|^|"))
}
if !noSort {
sort.Strings(lines[1:])
}
return columnize.Format(lines, listConfig)
}
// formatTime returns a human readable version of the given timestamp.
func formatTime(opts Options, x *types.Timestamp, nilValue ...string) string {
if x == nil {
if len(nilValue) > 0 {
return nilValue[0]
}
return ""
}
t, _ := types.TimestampFromProto(x)
if opts.Format == formatJSON {
return t.Format(time.RFC3339)
}
return humanize.Time(t)
}
// formatDuration returns a human readable version of the given duration.
func formatDuration(opts Options, x *types.Duration, nilValue ...string) string {
if x == nil {
if len(nilValue) > 0 {
return nilValue[0]
}
return ""
}
d, _ := types.DurationFromProto(x)
return d.String()
}
// formatOptionalString returns the given string or "-" when input is empty.
func formatOptionalString(value string) string {
if value == "" {
return "-"
}
return value
}