89 lines
3.2 KiB
Go
89 lines
3.2 KiB
Go
/*
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* Copyright (c) 2013, 2014 Conformal Systems LLC <info@conformal.com>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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package main
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import (
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"bytes"
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"fmt"
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"strings"
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)
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// semanticAlphabet
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const semanticAlphabet = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz-"
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// These constants define the application version and follow the semantic
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// versioning 2.0.0 spec (http://semver.org/).
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const (
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appMajor uint = 0
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appMinor uint = 5
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appPatch uint = 0
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// appPreRelease MUST only contain characters from semanticAlphabet
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// per the semantic versioning spec.
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appPreRelease = "alpha"
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)
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// appBuild is defined as a variable so it can be overridden during the build
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// process with '-ldflags "-X main.appBuild foo' if needed. It MUST only
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// contain characters from semanticAlphabet per the semantic versioning spec.
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var appBuild string
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// version returns the application version as a properly formed string per the
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// semantic versioning 2.0.0 spec (http://semver.org/).
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func version() string {
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// Start with the major, minor, and path versions.
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version := fmt.Sprintf("%d.%d.%d", appMajor, appMinor, appPatch)
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// Append pre-release version if there is one. The hyphen called for
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// by the semantic versioning spec is automatically appended and should
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// not be contained in the pre-release string. The pre-release version
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// is not appended if it contains invalid characters.
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preRelease := normalizeVerString(appPreRelease)
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if preRelease != "" {
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version = fmt.Sprintf("%s-%s", version, preRelease)
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}
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// Append build metadata if there is any. The plus called for
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// by the semantic versioning spec is automatically appended and should
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// not be contained in the build metadata string. The build metadata
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// string is not appended if it contains invalid characters.
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build := normalizeVerString(appBuild)
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if build != "" {
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version = fmt.Sprintf("%s+%s", version, build)
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}
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return version
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}
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// normalizeVerString returns the passed string stripped of all characters which
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// are not valid according to the semantic versioning guidelines for pre-release
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// version and build metadata strings. In particular they MUST only contain
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// characters in semanticAlphabet.
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func normalizeVerString(str string) string {
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result := bytes.Buffer{}
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for _, r := range str {
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if strings.ContainsRune(semanticAlphabet, r) {
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_, err := result.WriteRune(r)
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// Writing to a bytes.Buffer panics on OOM, and all
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// errors are unexpected.
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if err != nil {
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panic(err)
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}
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}
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}
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return result.String()
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}
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