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// Copyright 2013 Canonical Ltd.
// Licensed under the AGPLv3, see LICENCE file for details.
package main
import (
"fmt"
"launchpad.net/gnuflag"
"launchpad.net/juju-core/charm"
"launchpad.net/juju-core/cmd"
"launchpad.net/juju-core/worker/uniter/jujuc"
)
// dummyHookContext implements jujuc.Context,
// as expected by jujuc.NewCommand.
type dummyHookContext struct{}
func (dummyHookContext) UnitName() string {
return ""
}
func (dummyHookContext) PublicAddress() (string, bool) {
return "", false
}
func (dummyHookContext) PrivateAddress() (string, bool) {
return "", false
}
func (dummyHookContext) OpenPort(protocol string, port int) error {
return nil
}
func (dummyHookContext) ClosePort(protocol string, port int) error {
return nil
}
func (dummyHookContext) ConfigSettings() (charm.Settings, error) {
return charm.NewConfig().DefaultSettings(), nil
}
func (dummyHookContext) HookRelation() (jujuc.ContextRelation, bool) {
return nil, false
}
func (dummyHookContext) RemoteUnitName() (string, bool) {
return "", false
}
func (dummyHookContext) Relation(id int) (jujuc.ContextRelation, bool) {
return nil, false
}
func (dummyHookContext) RelationIds() []int {
return []int{}
}
func (dummyHookContext) OwnerTag() string {
return ""
}
type HelpToolCommand struct {
cmd.CommandBase
tool string
}
func (t *HelpToolCommand) Info() *cmd.Info {
return &cmd.Info{
Name: "help-tool",
Args: "[tool]",
Purpose: "show help on a juju charm tool",
}
}
func (t *HelpToolCommand) Init(args []string) error {
tool, err := cmd.ZeroOrOneArgs(args)
if err == nil {
t.tool = tool
}
return err
}
func (c *HelpToolCommand) Run(ctx *cmd.Context) error {
var hookctx dummyHookContext
if c.tool == "" {
// Ripped from SuperCommand. We could Run() a SuperCommand
// with "help commands", but then the implicit "help" command
// shows up.
names := jujuc.CommandNames()
cmds := make([]cmd.Command, 0, len(names))
longest := 0
for _, name := range names {
if c, err := jujuc.NewCommand(hookctx, name); err == nil {
if len(name) > longest {
longest = len(name)
}
cmds = append(cmds, c)
}
}
for _, c := range cmds {
info := c.Info()
fmt.Fprintf(ctx.Stdout, "%-*s %s\n", longest, info.Name, info.Purpose)
}
} else {
c, err := jujuc.NewCommand(hookctx, c.tool)
if err != nil {
return err
}
info := c.Info()
f := gnuflag.NewFlagSet(info.Name, gnuflag.ContinueOnError)
c.SetFlags(f)
ctx.Stdout.Write(info.Help(f))
}
return nil
}
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