man-page

BUILD

@@ -9,6 +9,7 @@ go_library(
     visibility = ["//visibility:private"],
     deps = [
         "//src/undocker/internal/cmdlxcconfig:go_default_library",
+        "//src/undocker/internal/cmdmanpage:go_default_library",
         "//src/undocker/internal/cmdrootfs:go_default_library",
         "@com_github_jessevdk_go_flags//:go_default_library",
     ],

internal/cmdmanpage/BUILD

@@ -0,0 +1,9 @@
+load("@io_bazel_rules_go//go:def.bzl", "go_library")
+
+go_library(
+    name = "go_default_library",
+    srcs = ["cmdmanpage.go"],
+    importpath = "github.com/motiejus/code/undocker/internal/cmdmanpage",
+    visibility = ["//src/undocker:__subpackages__"],
+    deps = ["@com_github_jessevdk_go_flags//:go_default_library"],
+)

internal/cmdmanpage/cmdmanpage.go

@@ -0,0 +1,25 @@
+package cmdmanpage
+
+import (
+	"io"
+	"os"
+
+	goflags "github.com/jessevdk/go-flags"
+)
+
+type Command struct {
+	parser *goflags.Parser
+	stdout io.Writer
+}
+
+func NewCommand(parser *goflags.Parser) *Command {
+	return &Command{
+		parser: parser,
+		stdout: os.Stdout,
+	}
+}
+
+func (c *Command) Execute(args []string) error {
+	c.parser.WriteManPage(c.stdout)
+	return nil
+}

main.go

@@ -5,18 +5,22 @@ import (
 
 	goflags "github.com/jessevdk/go-flags"
 	"github.com/motiejus/code/undocker/internal/cmdlxcconfig"
+	"github.com/motiejus/code/undocker/internal/cmdmanpage"
 	"github.com/motiejus/code/undocker/internal/cmdrootfs"
 )
 
 func main() {
-	flags := goflags.NewParser(nil, goflags.Default)
+	parser := goflags.NewParser(nil, goflags.Default)
 
 	rootfs := cmdrootfs.NewCommand()
 	lxcconfig := cmdlxcconfig.NewCommand()
-	flags.AddCommand("rootfs", rootfs.ShortDesc(), rootfs.LongDesc(), rootfs)
-	flags.AddCommand("lxcconfig", lxcconfig.ShortDesc(), lxcconfig.LongDesc(), lxcconfig)
+	manpage := cmdmanpage.NewCommand(parser)
+	parser.AddCommand("rootfs", rootfs.ShortDesc(), rootfs.LongDesc(), rootfs)
+	parser.AddCommand("lxcconfig", lxcconfig.ShortDesc(), lxcconfig.LongDesc(), lxcconfig)
+	m, _ := parser.AddCommand("man-page", "", "", manpage)
+	m.Hidden = true
 
-	_, err := flags.Parse()
+	_, err := parser.Parse()
 	if err != nil {
 		os.Exit(1)
 	}