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main.go
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main.go
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// Copyright © 2015-2016 Platina Systems, Inc. All rights reserved.
// Use of this source code is governed by the GPL-2 license described in the
// LICENSE file.
package main
import (
"bytes"
"fmt"
"go/build"
"io"
"io/ioutil"
"os"
"os/exec"
"path/filepath"
"text/template"
"time"
)
const gopkgdir = "main/go-package"
var gopkgpath string
const Tmpl = `// DO NOT EDIT! Instead, "go generate {{.Pkg.ImportPath}}".
package {{.Pkg.Name}}
//go:generate go run {{.Info.GoPkgDir}}/main.go {{.Info.GoRootDir}} {{.Info.RootUrl}}
var Package = map[string]string{
"importpath": "{{.Info.RootUrl}}",
"generated.by": "{{.Info.Generated.By}}",
"generated.on": "{{.Info.Generated.On}}",
"version": "{{.Info.Version}}",{{if .Info.Tag}}
"tag": ` + "`" + `{{.Info.Tag}}` + "`" + `,{{end}}{{if .Info.Diff}}
"diff": ` + "`" + `{{.Info.Diff}}` + "`" + `,{{end}}
"license": ` + "`" + `{{.Info.License}}` + "`" + `,
"patents": ` + "`" + `{{.Info.Patents}}` + "`" + `,
}
`
var Args = os.Args
var Exit = os.Exit
var Stderr io.Writer = os.Stderr
type Info struct {
GoPkgDir, GoRootDir, RootUrl, Diff, Version, Tag, License, Patents string
Generated struct {
By, On string
}
}
func main() {
// defer func() {
// if x := recover(); x != nil {
// fmt.Fprintln(Stderr, x)
// Exit(1)
// }
// }()
useremail := "no.one@no.where"
buf, err := exec.Command("git", "config", "--get",
"user.email").Output()
if err == nil && len(buf) > 0 {
useremail = string(bytes.TrimSpace(buf))
}
generatedBy := useremail
generatedOn := time.Now().UTC().String()
gopkgpath = Args[1] + "/" + gopkgdir
gopkg, err := build.ImportDir(gopkgpath, 0)
if err != nil {
panic(err)
}
tmpl, err := template.New("gen").Parse(Tmpl)
if err != nil {
panic(err)
}
if len(Args) == 2 {
Args = append(Args, ".")
}
path := Args[2]
var assume_unchanged string
info := new(Info)
info.GoRootDir = Args[1]
info.Generated.By = generatedBy
info.Generated.On = generatedOn
info.RootUrl = Args[3]
pkg, err := build.ImportDir(path, 0)
if err != nil {
panic(err)
}
info.GoPkgDir, err = filepath.Rel(pkg.Dir, gopkg.Dir)
if err != nil {
panic(err)
}
if !build.IsLocalImport(info.GoPkgDir) {
info.GoPkgDir = "./" + info.GoPkgDir
}
pkgfn := filepath.Join(pkg.Dir, "package.go")
if _, err = os.Stat(pkgfn); err == nil {
// overwrite existing package.go w/ repos version
buf, err = exec.Command("git", "-C", pkg.Dir,
"rev-parse", "HEAD").Output()
if err != nil {
panic(err)
}
info.Version = string(buf[:len(buf)-1])
assume_unchanged = "--assume-unchanged"
} else {
info.Version = fmt.Sprint("FIXME with go generate ",
pkg.ImportPath)
assume_unchanged = "--no-assume-unchanged"
}
buf, err = exec.Command("git", "describe", "--tags",
"--dirty='").Output()
if err == nil && len(buf) > 0 {
info.Tag = string(buf[:len(buf)-1])
}
buf, err = exec.Command("git", "diff", "--numstat").Output()
if err == nil && len(buf) > 0 {
info.Diff = string(buf[:len(buf)-1])
}
for _, x := range []struct {
fn string
p *string
}{
{"LICENSE", &info.License},
{"PATENTS", &info.Patents},
} {
r, e := os.Open(filepath.Join(pkg.Dir, x.fn))
if e == nil {
buf, err = ioutil.ReadAll(r)
if err != nil {
panic(err)
}
*x.p = string(buf)
}
}
pkgf, err := os.Create(pkgfn)
if err != nil {
panic(err)
}
err = tmpl.Execute(pkgf, struct {
Pkg *build.Package
Info *Info
}{pkg, info})
pkgf.Close()
if err != nil {
panic(err)
}
exec.Command("git", "-C", pkg.Dir, "update-index",
assume_unchanged, pkgfn).Run()
}