95 lines
1.8 KiB
Go
95 lines
1.8 KiB
Go
// Copyright 2014 The Gogs Authors. All rights reserved.
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// Use of this source code is governed by a MIT-style
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// license that can be found in the LICENSE file.
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package git
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import (
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"errors"
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"strings"
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"github.com/Unknwon/com"
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)
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var (
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// Cached Git version.
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gitVer *Version
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)
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// Version represents version of Git.
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type Version struct {
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Major, Minor, Patch int
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}
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func ParseVersion(verStr string) (*Version, error) {
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infos := strings.Split(verStr, ".")
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if len(infos) < 3 {
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return nil, errors.New("incorrect version input")
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}
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v := &Version{}
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for i, s := range infos {
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switch i {
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case 0:
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v.Major, _ = com.StrTo(s).Int()
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case 1:
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v.Minor, _ = com.StrTo(s).Int()
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case 2:
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v.Patch, _ = com.StrTo(strings.TrimSpace(s)).Int()
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}
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}
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return v, nil
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}
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func MustParseVersion(verStr string) *Version {
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v, _ := ParseVersion(verStr)
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return v
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}
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// Compare compares two versions,
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// it returns 1 if original is greater, -1 if original is smaller, 0 if equal.
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func (v *Version) Compare(that *Version) int {
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if v.Major > that.Major {
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return 1
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} else if v.Major < that.Major {
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return -1
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}
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if v.Minor > that.Minor {
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return 1
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} else if v.Minor < that.Minor {
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return -1
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}
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if v.Patch > that.Patch {
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return 1
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} else if v.Patch < that.Patch {
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return -1
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}
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return 0
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}
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func (v *Version) LessThan(that *Version) bool {
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return v.Compare(that) < 0
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}
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// GetVersion returns current Git version installed.
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func GetVersion() (*Version, error) {
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if gitVer != nil {
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return gitVer, nil
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}
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stdout, stderr, err := com.ExecCmd("git", "version")
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if err != nil {
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return nil, errors.New(stderr)
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}
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infos := strings.Split(stdout, " ")
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if len(infos) < 3 {
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return nil, errors.New("not enough output")
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}
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gitVer, err = ParseVersion(infos[2])
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return gitVer, err
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}
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