| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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. |
| */ |
| |
| package tabular |
| |
| import ( |
| "fmt" |
| "io" |
| "reflect" |
| |
| "github.com/olekukonko/tablewriter" |
| ) |
| |
| // New creates a tablewriter.Table and allows customizing the table. |
| // |
| // Each element should be a simple struct (not pointer) with a number of fields. |
| // Each field corresponds to a column in the table, the field must have json tag. |
| // The tag name is the column name in the table header. |
| // |
| // For example: |
| // ``` |
| // |
| // type tableStruct struct { |
| // PartitionCount int `json:"partition_count"` |
| // TableName string `json:"name"` |
| // } |
| // var tables []tableStruct |
| // ... |
| // tabular.Print(tables) |
| // |
| // ``` |
| func New(writer io.Writer, valueList []interface{}, configurer func(*tablewriter.Table)) *tablewriter.Table { |
| header := getHeaderFromValueList(valueList) |
| tabWriter := NewTabWriter(writer, header) |
| |
| // could replace the default settings |
| if configurer != nil { |
| configurer(tabWriter) |
| } |
| |
| for _, val := range valueList { |
| // each value displays as a row |
| |
| var row []string |
| reflectedValue := reflect.ValueOf(val) |
| for i := 0; i < reflectedValue.NumField(); i++ { |
| // columns are printed in the field order. |
| col := fmt.Sprintf("%v", reflectedValue.Field(i).Interface()) |
| row = append(row, col) |
| } |
| tabWriter.Append(row) |
| } |
| |
| return tabWriter |
| } |
| |
| func NewTabWriter(writer io.Writer, header []string) *tablewriter.Table { |
| tabWriter := tablewriter.NewWriter(writer) |
| tabWriter.SetAlignment(tablewriter.ALIGN_LEFT) |
| tabWriter.SetAutoFormatHeaders(false) |
| tabWriter.SetHeader(header) |
| var headerColors []tablewriter.Colors |
| for range header { |
| headerColors = append(headerColors, tablewriter.Colors{tablewriter.Bold}) |
| } |
| tabWriter.SetHeaderColor(headerColors...) |
| return tabWriter |
| } |
| |
| // Print out the list of elements in tabular form. |
| func Print(writer io.Writer, valueList []interface{}) { |
| New(writer, valueList, nil).Render() |
| } |
| |
| func getHeaderFromValueList(valueList []interface{}) []string { |
| if len(valueList) == 0 { |
| return []string{"result"} |
| } |
| |
| var header []string |
| val := valueList[0] |
| reflectedType := reflect.TypeOf(val) |
| for i := 0; i < reflectedType.NumField(); i++ { |
| // field tag |
| jsonTagName := reflectedType.Field(i).Tag.Get("json") |
| header = append(header, jsonTagName) |
| } |
| |
| return header |
| } |