| // Copyright 2019 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. |
| |
| package debug |
| |
| import ( |
| "fmt" |
| "io" |
| "os/exec" |
| "strings" |
| ) |
| |
| type PrintMode int |
| |
| const ( |
| PlainText = PrintMode(iota) |
| Markdown |
| HTML |
| ) |
| |
| // Version is a manually-updated mechanism for tracking versions. |
| var Version = "v0.1.6" |
| |
| // This writes the version and environment information to a writer. |
| func PrintVersionInfo(w io.Writer, verbose bool, mode PrintMode) { |
| if !verbose { |
| printBuildInfo(w, false, mode) |
| return |
| } |
| section(w, mode, "Build info", func() { |
| printBuildInfo(w, true, mode) |
| }) |
| fmt.Fprint(w, "\n") |
| section(w, mode, "Go info", func() { |
| cmd := exec.Command("go", "version") |
| cmd.Stdout = w |
| cmd.Run() |
| fmt.Fprint(w, "\n") |
| cmd = exec.Command("go", "env") |
| cmd.Stdout = w |
| cmd.Run() |
| }) |
| } |
| |
| func section(w io.Writer, mode PrintMode, title string, body func()) { |
| switch mode { |
| case PlainText: |
| fmt.Fprintln(w, title) |
| fmt.Fprintln(w, strings.Repeat("-", len(title))) |
| body() |
| case Markdown: |
| fmt.Fprintf(w, "#### %s\n\n```\n", title) |
| body() |
| fmt.Fprintf(w, "```\n") |
| case HTML: |
| fmt.Fprintf(w, "<h3>%s</h3>\n<pre>\n", title) |
| body() |
| fmt.Fprint(w, "</pre>\n") |
| } |
| } |