app_cfgr.go

package cli

import (
	"fmt"

	"github.com/Contra-Culture/report"
)

type (
	AppCfgr struct {
		app    *App
		report report.Node
	}
)

func (c *AppCfgr) Version(v string) {
	if len(c.app.version) > 0 {
		c.report.Error("app version already specified")
		return
	}
	c.app.version = v
}
func (c *AppCfgr) Title(n string) {
	if len(c.app.title) > 0 {
		c.report.Error("app title already specified")
		return
	}
	c.app.title = n
}
func (c *AppCfgr) Description(d string) {
	if len(c.app.description) > 0 {
		c.report.Error("app description already specified")
		return
	}
	c.app.description = d
}
func (c *AppCfgr) HandleErrorsWith(h func(error)) {
	if c.app.errorHandler != nil {
		c.report.Error("errors handler already specified")
		return
	}
	c.app.errorHandler = h
}
func (c *AppCfgr) Command(n string, cfg func(*CommandCfgr)) {
	for _, rn := range reservedCommandNames {
		if n == rn {
			c.report.Error("command name \"%s\" is reserved", n)
			return
		}
	}
	for _, cmd := range c.app.commands {
		if cmd.name == n {
			c.report.Error("app has already \"%s\" command specified", n)
			return
		}
	}
	var (
		command = &Command{
			name:   n,
			params: []*Param{},
		}
		commandCfgr = &CommandCfgr{
			command: command,
			report:  c.report.Structure(fmt.Sprintf("command \"%s\"", n)),
		}
	)
	cfg(commandCfgr)
	if commandCfgr.check() {
		c.app.commands = append(c.app.commands, command)
	}
}
func (c *AppCfgr) Default(cfg func(*CommandCfgr)) {
	if c.app.defaultCommand != nil {
		c.report.Error("app default command already specified")
		return
	}
	var (
		command = &Command{
			name:   DEFAULT_COMMAND_NAME,
			params: []*Param{},
		}
		commandCfgr = &CommandCfgr{
			isDefault: true,
			command:   command,
			report:    c.report.Structure("default-command"),
		}
	)
	cfg(commandCfgr)
	if commandCfgr.check() {
		c.app.defaultCommand = command
	}
}
func (c *AppCfgr) check() (ok bool) {
	errCount := 0
	ok = len(c.app.title) > 0
	if !ok {
		c.report.Error("no app title specified")
		errCount++
	}
	ok = len(c.app.description) > 0
	if !ok {
		c.report.Error("no app description specified")
		errCount++
	}
	c.app.commands = append(
		c.app.commands,
		&Command{
			name:        "help",
			description: "help shows help information.",
			title:       "help info",
			handler: func(_ map[string]string) error {
				fmt.Print(c.app.DocString())
				return nil
			},
		})
	c.app.commands = append(
		c.app.commands,
		&Command{
			name:        "version",
			description: "version shows the application version, build information and credits.",
			title:       "version and build info",
			handler: func(_ map[string]string) error {
				fmt.Println(c.app.version)
				return nil
			},
		})
	return errCount == 0
}