wide/util/go.go

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// Copyright (c) 2015, B3log
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
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package util
import (
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"os"
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"path"
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"path/filepath"
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"runtime"
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"sort"
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"strings"
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)
const (
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pathSeparator = string(os.PathSeparator) // OS-specific path separator
pathListSeparator = string(os.PathListSeparator) // OS-specific path list separator
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)
type mygo struct{}
// Go utilities.
var Go = mygo{}
// GetAPIPath gets the Go source code path.
//
// 1. before Go 1.4: $GOROOT/src/pkg
// 2. Go 1.4 and after: $GOROOT/src
func (*mygo) GetAPIPath() string {
ret := runtime.GOROOT() + "/src/pkg" // before Go 1.4
if !File.IsExist(ret) {
ret = runtime.GOROOT() + "/src" // Go 1.4 and after
}
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return filepath.FromSlash(path.Clean(ret))
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}
// IsAPI determines whether the specified path belongs to Go API.
func (*mygo) IsAPI(path string) bool {
apiPath := Go.GetAPIPath()
return strings.HasPrefix(path, apiPath)
}
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// GetGoFormats gets Go format tools. It may return ["gofmt", "goimports"].
func (*mygo) GetGoFormats() []string {
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ret := []string{"gofmt"}
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p := Go.GetExecutableInGOBIN("goimports")
if File.IsExist(p) {
ret = append(ret, "goimports")
}
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sort.Strings(ret)
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return ret
}
// GetExecutableInGOBIN gets executable file under GOBIN path.
//
// The specified executable should not with extension, this function will append .exe if on Windows.
func (*mygo) GetExecutableInGOBIN(executable string) string {
if OS.IsWindows() {
executable += ".exe"
}
gopaths := filepath.SplitList(os.Getenv("GOPATH"))
for _, gopath := range gopaths {
// $GOPATH/bin/$GOOS_$GOARCH/executable
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ret := gopath + pathSeparator + "bin" + pathSeparator +
os.Getenv("GOOS") + "_" + os.Getenv("GOARCH") + pathSeparator + executable
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if File.IsExist(ret) {
return ret
}
// $GOPATH/bin/{runtime.GOOS}_{runtime.GOARCH}/executable
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ret = gopath + pathSeparator + "bin" + pathSeparator +
runtime.GOOS + "_" + runtime.GOARCH + pathSeparator + executable
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if File.IsExist(ret) {
return ret
}
// $GOPATH/bin/executable
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ret = gopath + pathSeparator + "bin" + pathSeparator + executable
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if File.IsExist(ret) {
return ret
}
}
// $GOBIN/executable
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return os.Getenv("GOBIN") + pathSeparator + executable
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}