| // Copyright 2018 The Go Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style |
| // license that can be found in the LICENSE file. |
| |
| // The genv command generates version-specific go command source files. |
| package main |
| |
| import ( |
| "bytes" |
| "fmt" |
| "html/template" |
| "io/ioutil" |
| "os" |
| "os/exec" |
| "path/filepath" |
| "regexp" |
| "strings" |
| "time" |
| ) |
| |
| func usage() { |
| fmt.Fprintln(os.Stderr, "usage: genv <version>...") |
| os.Exit(2) |
| } |
| |
| func main() { |
| if len(os.Args) == 1 { |
| usage() |
| } |
| for _, version := range os.Args[1:] { |
| if !strings.HasPrefix(version, "go") { |
| failf("version names should have the 'go' prefix") |
| } |
| var buf bytes.Buffer |
| if err := mainTmpl.Execute(&buf, struct { |
| Year int |
| Version string // "go1.5.3rc2" |
| VersionNoPatch string // "go1.5" |
| CapitalSpaceVersion string // "Go 1.5" |
| DocHost string // "golang.org" or "tip.golang.org" for rc/beta |
| }{ |
| Year: time.Now().Year(), |
| Version: version, |
| VersionNoPatch: versionNoPatch(version), |
| DocHost: docHost(version), |
| CapitalSpaceVersion: strings.Replace(version, "go", "Go ", 1), |
| }); err != nil { |
| failf("mainTmpl.execute: %v", err) |
| } |
| path := filepath.Join(os.Getenv("GOPATH"), "src/golang.org/dl", version, "main.go") |
| if err := os.MkdirAll(filepath.Dir(path), 0755); err != nil { |
| failf("%v", err) |
| } |
| if err := ioutil.WriteFile(path, buf.Bytes(), 0666); err != nil { |
| failf("ioutil.WriteFile: %v", err) |
| } |
| fmt.Println("Wrote", path) |
| if err := exec.Command("gofmt", "-w", path).Run(); err != nil { |
| failf("could not gofmt file %q: %v", path, err) |
| } |
| } |
| } |
| |
| func docHost(ver string) string { |
| if strings.Contains(ver, "rc") || strings.Contains(ver, "beta") { |
| return "tip.golang.org" |
| } |
| return "golang.org" |
| } |
| |
| func versionNoPatch(ver string) string { |
| rx := regexp.MustCompile(`^(go\d+\.\d+)($|[\.]?\d*)($|rc|beta|\.)`) |
| m := rx.FindStringSubmatch(ver) |
| if m == nil { |
| failf("unrecognized version %q", ver) |
| } |
| if m[2] != "" { |
| return "devel/release.html#" + m[1] + ".minor" |
| } |
| return m[1] |
| } |
| |
| func failf(format string, args ...interface{}) { |
| if len(format) == 0 || format[len(format)-1] != '\n' { |
| format += "\n" |
| } |
| fmt.Fprintf(os.Stderr, format, args...) |
| os.Exit(1) |
| } |
| |
| var mainTmpl = template.Must(template.New("main").Parse(`// Copyright {{.Year}} The Go Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style |
| // license that can be found in the LICENSE file. |
| |
| // The {{.Version}} command runs the go command from {{.CapitalSpaceVersion}}. |
| // |
| // To install, run: |
| // |
| // $ go get golang.org/dl/{{.Version}} |
| // $ {{.Version}} download |
| // |
| // And then use the {{.Version}} command as if it were your normal go |
| // command. |
| // |
| // See the release notes at https://{{.DocHost}}/doc/{{.VersionNoPatch}} |
| // |
| // File bugs at https://golang.org/issues/new |
| package main |
| |
| import "golang.org/dl/internal/version" |
| |
| func main() { |
| version.Run("{{.Version}}") |
| } |
| `)) |