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/*
* version.go - Version subcommand that can be added to any binary
*
* Copyright 2017 Google Inc.
* Author: Joe Richey (joerichey@google.com)
*
* 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.
*/
package cmd
import (
"fmt"
"github.com/blang/semver"
)
// Templates for use with the version command, which both parse the Info var.
var (
VersionTemplate = "{{.FullName}} {{.Info.Version}}\n"
VersionLongTemplate = `{{if .Info.BuildTime}}
Compiled:
{{.Info.BuildTime}}
{{end}}
{{with $length := len .Info.Authors}}
{{if $length}}
Author{{if ne 1 $length}}s{{end}}:
{{range .Info.Authors}}
{{.Name}}{{if .Email}} <{{.Email}}>{{end}}
{{end}}
{{end}}
{{end}}
{{if .Info.Copyright}}
Copyright:
{{.Info.Copyright}}
{{end}}`
)
// VersionCommand is a command which will display either the VersionTag (by
// default) or the full version information: version, copyright, authors, etc...
var VersionCommand = &Command{
Name: "version",
Title: "display this program's version information",
UsageLines: []string{fmt.Sprintf("[%v]", longFlag)},
Flags: []Flag{longFlag, HelpFlag},
Action: versionAction,
}
// VersionUsage is a UsageLine to add to a Command with a version Subcommand.
var VersionUsage = VersionCommand.Name + " " + VersionCommand.UsageLines[0]
// longFlag tells the version command to display the longer version info.
var longFlag = &BoolFlag{
Name: "long",
Usage: "Print the detailed version, build, and copyright information.",
}
func versionAction(ctx *Context) error {
if ctx.Info.Version.Equals(semver.Version{}) {
return ErrUnknownVersion
}
ctx.executeTemplate(Output, VersionTemplate)
if longFlag.Value {
ctx.executeTemplate(Output, VersionLongTemplate)
}
return nil
}
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