feat: man pages and completions

Signed-off-by: Carlos A Becker <caarlos0@gmail.com>

cmd/melt/main.go

@@ -13,6 +13,8 @@ import (
 	"github.com/charmbracelet/melt"
 	"github.com/mattn/go-isatty"
 	"github.com/muesli/coral"
+	mcoral "github.com/muesli/mango-coral"
+	"github.com/muesli/roff"
 	"golang.org/x/crypto/ssh"
 	"golang.org/x/term"
 )
@@ -23,9 +25,29 @@ var (
 	restoreStyle  = lipgloss.NewStyle().Bold(true).Margin(1)
 
 	rootCmd = &coral.Command{
-		Use:          "melt",
-		Short:        "Backup and restore SSH keys using a mnemonic",
+		Use:   "melt",
+		Short: "Backup and restore SSH keys using a mnemonic",
+		Long: `melt uses bip39 to create a mnemonic set of words that represents your SSH keys.
+
+You can then use those words to restore your private key at any time.`,
+		SilenceUsage: true,
+	}
+	manCmd = &coral.Command{
+		Use:          "man",
+		Args:         coral.NoArgs,
+		Short:        "generate man pages",
+		Hidden:       true,
 		SilenceUsage: true,
+		RunE: func(cmd *coral.Command, args []string) error {
+			manPage, err := mcoral.NewManPage(1, rootCmd)
+			if err != nil {
+				return err
+			}
+			manPage = manPage.WithSection("Copyright", "(C) 2022 Charmbracelet, Inc.\n"+
+				"Released under MIT license.")
+			fmt.Println(manPage.Build(roff.NewDocument()))
+			return nil
+		},
 	}
 	backupCmd = &coral.Command{
 		Use:     "backup",
@@ -68,7 +90,7 @@ Store them somewhere safe, print or memorize them.`))
 )
 
 func init() {
-	rootCmd.AddCommand(backupCmd, restoreCmd)
+	rootCmd.AddCommand(backupCmd, restoreCmd, manCmd)
 
 	restoreCmd.PersistentFlags().StringVarP(&mnemonic, "mnemonic", "m", "-", "Mnemonic set of words given by the backup command")
 	_ = restoreCmd.MarkFlagRequired("mnemonic")

go.mod

@@ -8,6 +8,8 @@ require (
 	github.com/matryer/is v1.4.0
 	github.com/mattn/go-isatty v0.0.14
 	github.com/muesli/coral v1.0.0
+	github.com/muesli/mango-coral v1.0.1
+	github.com/muesli/roff v0.1.0
 	github.com/tyler-smith/go-bip39 v1.1.0
 	golang.org/x/crypto v0.0.0-20220307211146-efcb8507fb70
 	golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1
@@ -17,6 +19,8 @@ require (
 	github.com/inconshreveable/mousetrap v1.0.0 // indirect
 	github.com/lucasb-eyer/go-colorful v1.2.0 // indirect
 	github.com/mattn/go-runewidth v0.0.13 // indirect
+	github.com/muesli/mango v0.1.0 // indirect
+	github.com/muesli/mango-pflag v0.1.0 // indirect
 	github.com/muesli/reflow v0.2.1-0.20210115123740-9e1d0d53df68 // indirect
 	github.com/muesli/termenv v0.11.1-0.20220204035834-5ac8409525e0 // indirect
 	github.com/rivo/uniseg v0.2.0 // indirect

go.sum

@@ -16,8 +16,16 @@ github.com/mattn/go-runewidth v0.0.13 h1:lTGmDsbAYt5DmK6OnoV7EuIF1wEIFAcxld6ypU4
 github.com/mattn/go-runewidth v0.0.13/go.mod h1:Jdepj2loyihRzMpdS35Xk/zdY8IAYHsh153qUoGf23w=
 github.com/muesli/coral v1.0.0 h1:odyqkoEg4aJAINOzvnjN4tUsdp+Zleccs7tRIAkkYzU=
 github.com/muesli/coral v1.0.0/go.mod h1:bf91M/dkp7iHQw73HOoR9PekdTJMTD6ihJgWoDitde8=
+github.com/muesli/mango v0.1.0 h1:DZQK45d2gGbql1arsYA4vfg4d7I9Hfx5rX/GCmzsAvI=
+github.com/muesli/mango v0.1.0/go.mod h1:5XFpbC8jY5UUv89YQciiXNlbi+iJgt29VDC5xbzrLL4=
+github.com/muesli/mango-coral v1.0.1 h1:W3nGbUC/q5vLscQ6GPzteHZrJI1Msjw5Hns82o0xRkI=
+github.com/muesli/mango-coral v1.0.1/go.mod h1:EPSlYH67AtcxQrxssNw6r/lMFxHTjuDoGfq9Uxxevhg=
+github.com/muesli/mango-pflag v0.1.0 h1:UADqbYgpUyRoBja3g6LUL+3LErjpsOwaC9ywvBWe7Sg=
+github.com/muesli/mango-pflag v0.1.0/go.mod h1:YEQomTxaCUp8PrbhFh10UfbhbQrM/xJ4i2PB8VTLLW0=
 github.com/muesli/reflow v0.2.1-0.20210115123740-9e1d0d53df68 h1:y1p/ycavWjGT9FnmSjdbWUlLGvcxrY0Rw3ATltrxOhk=
 github.com/muesli/reflow v0.2.1-0.20210115123740-9e1d0d53df68/go.mod h1:Xk+z4oIWdQqJzsxyjgl3P22oYZnHdZ8FFTHAQQt5BMQ=
+github.com/muesli/roff v0.1.0 h1:YD0lalCotmYuF5HhZliKWlIx7IEhiXeSfq7hNjFqGF8=
+github.com/muesli/roff v0.1.0/go.mod h1:pjAHQM9hdUUwm/krAfrLGgJkXJ+YuhtsfZ42kieB2Ig=
 github.com/muesli/termenv v0.11.1-0.20220204035834-5ac8409525e0 h1:STjmj0uFfRryL9fzRA/OupNppeAID6QJYPMavTL7jtY=
 github.com/muesli/termenv v0.11.1-0.20220204035834-5ac8409525e0/go.mod h1:Bd5NYQ7pd+SrtBSrSNoBBmXlcY8+Xj4BMJgh8qcZrvs=
 github.com/rivo/uniseg v0.1.0/go.mod h1:J6wj4VEh+S6ZtnVlnTBMWIodfgj8LQOQFoIToxlJtxc=