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100 lines
3.5 KiB
Go
100 lines
3.5 KiB
Go
// Copyright (c) 2013-2014 The btcsuite developers
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// Copyright (c) 2015-2017 The Decred developers
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// Use of this source code is governed by an ISC
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// license that can be found in the LICENSE file.
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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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const (
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// semanticAlphabet defines the allowed characters for the pre-release
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// portion of a semantic version string.
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semanticAlphabet = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz-"
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// semanticBuildAlphabet defines the allowed characters for the build
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// portion of a semantic version string.
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semanticBuildAlphabet = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz-."
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)
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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 = 1
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appMinor uint = 3
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appPatch uint = 0
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)
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var (
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// appPreRelease is defined as a variable so it can be overridden during
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// the build process with '-ldflags "-X main.appPreRelease=foo"' if
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// needed. It MUST only contain characters from semanticAlphabet per
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// the semantic versioning spec.
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appPreRelease = ""
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// appBuild is defined as a variable so it can be overridden during the
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// build process with '-ldflags "-X main.appBuild=foo"' if needed. It
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// MUST only contain characters from semanticBuildAlphabet per the
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// semantic versioning spec.
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appBuild = "dev"
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)
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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 patch 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 := normalizePreRelString(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 := normalizeBuildString(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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// normalizeSemString returns the passed string stripped of all characters
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// which are not valid according to the provided semantic versioning alphabet.
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func normalizeSemString(str, alphabet string) string {
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var result bytes.Buffer
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for _, r := range str {
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if strings.ContainsRune(alphabet, r) {
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result.WriteRune(r)
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}
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}
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return result.String()
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}
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// normalizePreRelString returns the passed string stripped of all characters
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// which are not valid according to the semantic versioning guidelines for
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// pre-release strings. In particular they MUST only contain characters in
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// semanticAlphabet.
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func normalizePreRelString(str string) string {
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return normalizeSemString(str, semanticAlphabet)
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}
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// normalizeBuildString returns the passed string stripped of all characters
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// which are not valid according to the semantic versioning guidelines for build
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// metadata strings. In particular they MUST only contain characters in
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// semanticBuildAlphabet.
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func normalizeBuildString(str string) string {
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return normalizeSemString(str, semanticBuildAlphabet)
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}
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