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