Auto generation of a man page

README.md

@@ -422,6 +422,10 @@ func main() {
 
 Cobra can generate a markdown formatted document based on the subcommands, flags, etc. A simple example of how to do this for your command can be found in [Markdown Docs](md_docs.md)
 
+## Generating man pages for your command
+
+Cobra can generate a man page based on the subcommands, flags, etc. A simple example of how to do this for your command can be found in [Man Docs](man_docs.md)
+
 ## Generating bash completions for your command
 
 Cobra can generate a bash completions file. If you add more information to your command these completions can be amazingly powerful and flexible.  Read more about [Bash Completions](bash_completions.md)

bash_completions.go

@@ -212,7 +212,7 @@ func postscript(out *bytes.Buffer, name string) {
 func writeCommands(cmd *Command, out *bytes.Buffer) {
 	fmt.Fprintf(out, "    commands=()\n")
 	for _, c := range cmd.Commands() {
-		if len(c.Deprecated) > 0 {
+		if len(c.Deprecated) > 0 || c == cmd.helpCommand {
 			continue
 		}
 		fmt.Fprintf(out, "    commands+=(%q)\n", c.Name())
@@ -321,7 +321,7 @@ func writeRequiredNoun(cmd *Command, out *bytes.Buffer) {
 
 func gen(cmd *Command, out *bytes.Buffer) {
 	for _, c := range cmd.Commands() {
-		if len(c.Deprecated) > 0 {
+		if len(c.Deprecated) > 0 || c == cmd.helpCommand {
 			continue
 		}
 		gen(c, out)

doc_util.go

@@ -0,0 +1,36 @@
+// Copyright 2015 Red Hat Inc. All rights reserved.
+//
+// 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
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// 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.
+
+package cobra
+
+import ()
+
+// Test to see if we have a reason to print See Also information in docs
+// Basically this is a test for a parent commend or a subcommand which is
+// both not deprecated and not the autogenerated help command.
+func (cmd *Command) hasSeeAlso() bool {
+	if cmd.HasParent() {
+		return true
+	}
+	children := cmd.Commands()
+	if len(children) == 0 {
+		return false
+	}
+	for _, c := range children {
+		if len(c.Deprecated) != 0 || c == cmd.helpCommand {
+			continue
+		}
+		return true
+	}
+	return false
+}

man_docs.go

@@ -0,0 +1,166 @@
+// Copyright 2015 Red Hat Inc. All rights reserved.
+//
+// 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
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// 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.
+
+package cobra
+
+import (
+	"bytes"
+	"fmt"
+	"os"
+	"sort"
+	"strings"
+	"time"
+
+	mangen "github.com/cpuguy83/go-md2man/md2man"
+	"github.com/spf13/pflag"
+)
+
+func GenManTree(cmd *Command, projectName, dir string) {
+	cmd.GenManTree(projectName, dir)
+}
+
+func (cmd *Command) GenManTree(projectName, dir string) {
+	for _, c := range cmd.Commands() {
+		if len(c.Deprecated) != 0 || c == cmd.helpCommand {
+			continue
+		}
+		GenManTree(c, projectName, dir)
+	}
+	out := new(bytes.Buffer)
+
+	cmd.GenMan(projectName, out)
+
+	filename := cmd.CommandPath()
+	filename = dir + strings.Replace(filename, " ", "-", -1) + ".1"
+	outFile, err := os.Create(filename)
+	if err != nil {
+		fmt.Println(err)
+		os.Exit(1)
+	}
+	defer outFile.Close()
+	_, err = outFile.Write(out.Bytes())
+	if err != nil {
+		fmt.Println(err)
+		os.Exit(1)
+	}
+}
+
+func GenMan(cmd *Command, projectName string, out *bytes.Buffer) {
+	cmd.GenMan(projectName, out)
+}
+
+func (cmd *Command) GenMan(projectName string, out *bytes.Buffer) {
+
+	buf := genMarkdown(cmd, projectName)
+	final := mangen.Render(buf)
+	out.Write(final)
+}
+
+func manPreamble(out *bytes.Buffer, projectName, name, short, long string) {
+	fmt.Fprintf(out, `%% %s(1) kubernetes User Manuals
+%% Eric Paris
+%% Jan 2015
+# NAME
+`, projectName)
+	fmt.Fprintf(out, "%s \\- %s\n\n", name, short)
+	fmt.Fprintf(out, "# SYNOPSIS\n")
+	fmt.Fprintf(out, "**%s** [OPTIONS]\n\n", name)
+	fmt.Fprintf(out, "# DESCRIPTION\n")
+	fmt.Fprintf(out, "%s\n\n", long)
+}
+
+func manPrintFlags(out *bytes.Buffer, flags *pflag.FlagSet) {
+	flags.VisitAll(func(flag *pflag.Flag) {
+		if len(flag.Deprecated) > 0 {
+			return
+		}
+		format := ""
+		if len(flag.Shorthand) > 0 {
+			format = "**-%s**, **--%s**"
+		} else {
+			format = "%s**--%s**"
+		}
+		if len(flag.NoOptDefVal) > 0 {
+			format = format + "["
+		}
+		if flag.Value.Type() == "string" {
+			// put quotes on the value
+			format = format + "=%q"
+		} else {
+			format = format + "=%s"
+		}
+		if len(flag.NoOptDefVal) > 0 {
+			format = format + "]"
+		}
+		format = format + "\n\t%s\n\n"
+		fmt.Fprintf(out, format, flag.Shorthand, flag.Name, flag.DefValue, flag.Usage)
+	})
+}
+
+func manPrintOptions(out *bytes.Buffer, command *Command) {
+	flags := command.NonInheritedFlags()
+	if flags.HasFlags() {
+		fmt.Fprintf(out, "# OPTIONS\n")
+		manPrintFlags(out, flags)
+		fmt.Fprintf(out, "\n")
+	}
+	flags = command.InheritedFlags()
+	if flags.HasFlags() {
+		fmt.Fprintf(out, "# OPTIONS INHERITED FROM PARENT COMMANDS\n")
+		manPrintFlags(out, flags)
+		fmt.Fprintf(out, "\n")
+	}
+}
+
+func genMarkdown(cmd *Command, projectName string) []byte {
+	// something like `rootcmd subcmd1 subcmd2`
+	commandName := cmd.CommandPath()
+	// something like `rootcmd-subcmd1-subcmd2`
+	dashCommandName := strings.Replace(commandName, " ", "-", -1)
+
+	buf := new(bytes.Buffer)
+
+	short := cmd.Short
+	long := cmd.Long
+	if len(long) == 0 {
+		long = short
+	}
+
+	manPreamble(buf, projectName, commandName, short, long)
+	manPrintOptions(buf, cmd)
+
+	if len(cmd.Example) > 0 {
+		fmt.Fprintf(buf, "# EXAMPLE\n")
+		fmt.Fprintf(buf, "```\n%s\n```\n", cmd.Example)
+	}
+
+	if cmd.hasSeeAlso() {
+		fmt.Fprintf(buf, "# SEE ALSO\n")
+		if cmd.HasParent() {
+			fmt.Fprintf(buf, "**%s(1)**, ", cmd.Parent().CommandPath())
+		}
+
+		children := cmd.Commands()
+		sort.Sort(byName(children))
+		for _, c := range children {
+			if len(c.Deprecated) != 0 || c == cmd.helpCommand {
+				continue
+			}
+			fmt.Fprintf(buf, "**%s-%s(1)**, ", dashCommandName, c.Name())
+		}
+		fmt.Fprintf(buf, "\n")
+	}
+
+	fmt.Fprintf(buf, "# HISTORY\n%s Auto generated by spf13/cobra\n", time.Now().UTC())
+	return buf.Bytes()
+}

man_docs.md

@@ -0,0 +1,21 @@
+# Generating Man Pages For Your Own cobra.Command
+
+Generating bash completions from a cobra command is incredibly easy. An example is as follows:
+
+```go
+package main
+
+import (
+	"github.com/spf13/cobra"
+)
+
+func main() {
+	cmd := &cobra.Command{
+		Use:   "test",
+		Short: "my test program",
+	}
+	cmd.GenManTree("/tmp")
+}
+```
+
+That will get you a man page `/tmp/test.1`

man_docs_test.go

@@ -0,0 +1,71 @@
+package cobra
+
+import (
+	"bytes"
+	"fmt"
+	"os"
+	"strings"
+	"testing"
+)
+
+var _ = fmt.Println
+var _ = os.Stderr
+
+func translate(in string) string {
+	return strings.Replace(in, "-", "\\-", -1)
+}
+
+func TestGenManDoc(t *testing.T) {
+	c := initializeWithRootCmd()
+	// Need two commands to run the command alphabetical sort
+	cmdEcho.AddCommand(cmdTimes, cmdEchoSub, cmdDeprecated)
+	c.AddCommand(cmdPrint, cmdEcho)
+	cmdRootWithRun.PersistentFlags().StringVarP(&flags2a, "rootflag", "r", "two", strtwoParentHelp)
+
+	out := new(bytes.Buffer)
+
+	// We generate on a subcommand so we have both subcommands and parents
+	cmdEcho.GenMan("PROJECT", out)
+	found := out.String()
+
+	// Our description
+	expected := translate(cmdEcho.Name())
+	if !strings.Contains(found, expected) {
+		t.Errorf("Unexpected response.\nExpecting to contain: \n %q\nGot:\n %q\n", expected, found)
+	}
+
+	// Better have our example
+	expected = translate(cmdEcho.Name())
+	if !strings.Contains(found, expected) {
+		t.Errorf("Unexpected response.\nExpecting to contain: \n %q\nGot:\n %q\n", expected, found)
+	}
+
+	// A local flag
+	expected = "boolone"
+	if !strings.Contains(found, expected) {
+		t.Errorf("Unexpected response.\nExpecting to contain: \n %q\nGot:\n %q\n", expected, found)
+	}
+
+	// persistent flag on parent
+	expected = "rootflag"
+	if !strings.Contains(found, expected) {
+		t.Errorf("Unexpected response.\nExpecting to contain: \n %q\nGot:\n %q\n", expected, found)
+	}
+
+	// We better output info about our parent
+	expected = translate(cmdRootWithRun.Name())
+	if !strings.Contains(found, expected) {
+		t.Errorf("Unexpected response.\nExpecting to contain: \n %q\nGot:\n %q\n", expected, found)
+	}
+
+	// And about subcommands
+	expected = translate(cmdEchoSub.Name())
+	if !strings.Contains(found, expected) {
+		t.Errorf("Unexpected response.\nExpecting to contain: \n %q\nGot:\n %q\n", expected, found)
+	}
+
+	unexpected := translate(cmdDeprecated.Name())
+	if strings.Contains(found, unexpected) {
+		t.Errorf("Unexpected response.\nFound: %v\nBut should not have!!\n", unexpected)
+	}
+}

md_docs.go

@@ -47,10 +47,18 @@ func (s byName) Swap(i, j int)      { s[i], s[j] = s[j], s[i] }
 func (s byName) Less(i, j int) bool { return s[i].Name() < s[j].Name() }
 
 func GenMarkdown(cmd *Command, out *bytes.Buffer) {
-	GenMarkdownCustom(cmd, out, func(s string) string { return s })
+	cmd.GenMarkdown(out)
+}
+
+func (cmd *Command) GenMarkdown(out *bytes.Buffer) {
+	cmd.GenMarkdownCustom(out, func(s string) string { return s })
 }
 
 func GenMarkdownCustom(cmd *Command, out *bytes.Buffer, linkHandler func(string) string) {
+	cmd.GenMarkdownCustom(out, linkHandler)
+}
+
+func (cmd *Command) GenMarkdownCustom(out *bytes.Buffer, linkHandler func(string) string) {
 	name := cmd.CommandPath()
 
 	short := cmd.Short
@@ -75,7 +83,7 @@ func GenMarkdownCustom(cmd *Command, out *bytes.Buffer, linkHandler func(string)
 
 	printOptions(out, cmd, name)
 
-	if len(cmd.Commands()) > 0 || cmd.HasParent() {
+	if cmd.hasSeeAlso() {
 		fmt.Fprintf(out, "### SEE ALSO\n")
 		if cmd.HasParent() {
 			parent := cmd.Parent()
@@ -89,7 +97,7 @@ func GenMarkdownCustom(cmd *Command, out *bytes.Buffer, linkHandler func(string)
 		sort.Sort(byName(children))
 
 		for _, child := range children {
-			if len(child.Deprecated) > 0 {
+			if len(child.Deprecated) > 0 || child == cmd.helpCommand {
 				continue
 			}
 			cname := name + " " + child.Name()
@@ -104,18 +112,29 @@ func GenMarkdownCustom(cmd *Command, out *bytes.Buffer, linkHandler func(string)
 }
 
 func GenMarkdownTree(cmd *Command, dir string) {
+	cmd.GenMarkdownTree(dir)
+}
+
+func (cmd *Command) GenMarkdownTree(dir string) {
 	identity := func(s string) string { return s }
 	emptyStr := func(s string) string { return "" }
-	GenMarkdownTreeCustom(cmd, dir, emptyStr, identity)
+	cmd.GenMarkdownTreeCustom(dir, emptyStr, identity)
 }
 
 func GenMarkdownTreeCustom(cmd *Command, dir string, filePrepender func(string) string, linkHandler func(string) string) {
+	cmd.GenMarkdownTreeCustom(dir, filePrepender, linkHandler)
+}
+
+func (cmd *Command) GenMarkdownTreeCustom(dir string, filePrepender func(string) string, linkHandler func(string) string) {
 	for _, c := range cmd.Commands() {
-		GenMarkdownTreeCustom(c, dir, filePrepender, linkHandler)
+		if len(c.Deprecated) != 0 || c == cmd.helpCommand {
+			continue
+		}
+		c.GenMarkdownTreeCustom(dir, filePrepender, linkHandler)
 	}
 	out := new(bytes.Buffer)
 
-	GenMarkdownCustom(cmd, out, linkHandler)
+	cmd.GenMarkdownCustom(out, linkHandler)
 
 	filename := cmd.CommandPath()
 	filename = dir + strings.Replace(filename, " ", "_", -1) + ".md"