78 lines
2.4 KiB
Go
78 lines
2.4 KiB
Go
// Protocol Buffers for Go with Gadgets
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//
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// Copyright (c) 2013, The GoGo Authors. All rights reserved.
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// http://github.com/gogo/protobuf
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following disclaimer
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// in the documentation and/or other materials provided with the
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// distribution.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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package version
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import (
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"fmt"
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"os/exec"
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"strconv"
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"strings"
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)
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func Get() string {
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versionBytes, _ := exec.Command("protoc", "--version").CombinedOutput()
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version := strings.TrimSpace(string(versionBytes))
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versions := strings.Split(version, " ")
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if len(versions) != 2 {
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panic("version string returned from protoc is seperated with a space: " + version)
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}
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return versions[1]
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}
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func parseVersion(version string) (int, error) {
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versions := strings.Split(version, ".")
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if len(versions) != 3 {
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return 0, fmt.Errorf("version does not have 3 numbers seperated by dots: %s", version)
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}
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n := 0
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for _, v := range versions {
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i, err := strconv.Atoi(v)
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if err != nil {
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return 0, err
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}
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n = n*10 + i
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}
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return n, nil
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}
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func less(this, that string) bool {
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thisNum, err := parseVersion(this)
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if err != nil {
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panic(err)
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}
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thatNum, err := parseVersion(that)
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if err != nil {
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panic(err)
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}
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return thisNum <= thatNum
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}
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func AtLeast(v string) bool {
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return less(v, Get())
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}
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