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package mangokong
import (
"fmt"
"strings"
"github.com/alecthomas/kong"
"github.com/muesli/mango"
"github.com/muesli/roff"
)
// ManFlag can be used as a Kong flag that will write a default man page to stdout.
type ManFlag bool
func (m ManFlag) BeforeApply(app *kong.Kong) error {
man := NewManPage(1, app.Model)
fmt.Fprint(app.Stdout, man.Build(roff.NewDocument()))
app.Exit(0)
return nil
}
// NewManPage from a Kong Application.
func NewManPage(section uint, app *kong.Application) *mango.ManPage {
help := strings.Split(strings.TrimSpace(app.Help), "\n")
man := mango.NewManPage(section, app.Name, help[0])
if app.Detail != "" {
man = man.WithLongDescription(app.Detail)
} else {
man = man.WithLongDescription(strings.TrimSpace(strings.Join(help[1:], "\n")))
}
addCommand(man, app.Node, nil)
return man
}
func addCommand(man *mango.ManPage, node *kong.Node, parent *mango.Command) {
var item *mango.Command
name := node.Summary()
if parent == nil {
name = node.Name
}
item = mango.NewCommand(name, node.Help, node.Detail)
if parent == nil {
man.Root = *item
item = &man.Root
} else {
err := parent.AddCommand(item)
if err != nil { // Kong already validates structure, so this should never fail.
panic(err)
}
}
for _, child := range node.Children {
if child.Hidden {
continue
}
addCommand(man, child, item)
}
for _, flag := range node.Flags {
short := ""
if flag.Short != 0 {
short = fmt.Sprintf("%c", flag.Short)
}
item.AddFlag(mango.Flag{
Name: strings.TrimPrefix(flag.Summary(), "--"),
Short: short,
Usage: flag.Help,
PFlag: true,
})
}
}
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