cobra_helper.go

// Copyright © 2017 Wei Shen <shenwei356@gmail.com>
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.

package main

import (
	"fmt"
	"os"
	"strconv"

	"github.com/shenwei356/util/stringutil"
	"github.com/spf13/cobra"
)

func checkError(err error) {
	if err != nil {
		log.Error(err)
		os.Exit(-1)
	}
}

func getFileList(args []string) []string {
	files := []string{}
	if len(args) == 0 {
		files = append(files, "-")
	} else {
		for _, file := range files {
			if file == "-" {
				continue
			}
			if _, err := os.Stat(file); os.IsNotExist(err) {
				checkError(err)
			}
		}
		files = args
	}
	return files
}

func getFlagInt(cmd *cobra.Command, flag string) int {
	value, err := cmd.Flags().GetInt(flag)
	checkError(err)
	return value
}

func getFlagPositiveInt(cmd *cobra.Command, flag string) int {
	value, err := cmd.Flags().GetInt(flag)
	checkError(err)
	if value <= 0 {
		checkError(fmt.Errorf("value of flag --%s should be greater than 0", flag))
	}
	return value
}

func getFlagPositiveFloat64(cmd *cobra.Command, flag string) float64 {
	value, err := cmd.Flags().GetFloat64(flag)
	checkError(err)
	if value <= 0 {
		checkError(fmt.Errorf("value of flag --%s should be greater than 0", flag))
	}
	return value
}

func getFlagNonNegativeInt(cmd *cobra.Command, flag string) int {
	value, err := cmd.Flags().GetInt(flag)
	checkError(err)
	if value < 0 {
		checkError(fmt.Errorf("value of flag --%s should be greater than or equal to 0", flag))
	}
	return value
}

func getFlagNonNegativeFloat64(cmd *cobra.Command, flag string) float64 {
	value, err := cmd.Flags().GetFloat64(flag)
	checkError(err)
	if value < 0 {
		checkError(fmt.Errorf("value of flag --%s should be greater than or equal to ", flag))
	}
	return value
}

func getFlagBool(cmd *cobra.Command, flag string) bool {
	value, err := cmd.Flags().GetBool(flag)
	checkError(err)
	return value
}

func getFlagString(cmd *cobra.Command, flag string) string {
	value, err := cmd.Flags().GetString(flag)
	checkError(err)
	return value
}

func getFlagCommaSeparatedStrings(cmd *cobra.Command, flag string) []string {
	value, err := cmd.Flags().GetString(flag)
	checkError(err)
	return stringutil.Split(value, ",")
}

func getFlagSemicolonSeparatedStrings(cmd *cobra.Command, flag string) []string {
	value, err := cmd.Flags().GetString(flag)
	checkError(err)
	return stringutil.Split(value, ";")
}

func getFlagCommaSeparatedInts(cmd *cobra.Command, flag string) []int {
	filedsStrList := getFlagCommaSeparatedStrings(cmd, flag)
	fields := make([]int, len(filedsStrList))
	for i, value := range filedsStrList {
		v, err := strconv.Atoi(value)
		if err != nil {
			checkError(fmt.Errorf("value of flag --%s should be comma separated integers", flag))
		}
		fields[i] = v
	}
	return fields
}

func getFlagRune(cmd *cobra.Command, flag string) rune {
	value, err := cmd.Flags().GetString(flag)
	checkError(err)
	if len(value) > 1 {
		checkError(fmt.Errorf("value of flag --%s should has length of 1", flag))
	}
	var v rune
	for _, r := range value {
		v = r
		break
	}
	return v
}

func getFlagFloat64(cmd *cobra.Command, flag string) float64 {
	value, err := cmd.Flags().GetFloat64(flag)
	checkError(err)
	return value
}

func getFlagInt64(cmd *cobra.Command, flag string) int64 {
	value, err := cmd.Flags().GetInt64(flag)
	checkError(err)
	return value
}

func getFlagStringSlice(cmd *cobra.Command, flag string) []string {
	value, err := cmd.Flags().GetStringSlice(flag)
	checkError(err)
	return value
}