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commands.go
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commands.go
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package commands
import (
"fmt"
"strings"
"github.com/github/hub/ui"
flag "github.com/ogier/pflag"
)
var (
NameRe = "[\\w.][\\w.-]*"
OwnerRe = "[a-zA-Z0-9][a-zA-Z0-9-]*"
NameWithOwnerRe = fmt.Sprintf("^(?:%s|%s\\/%s)$", NameRe, OwnerRe, NameRe)
CmdRunner = NewRunner()
)
type Command struct {
Run func(cmd *Command, args *Args)
Flag flag.FlagSet
Key string
Usage string
Long string
GitExtension bool
subCommands map[string]*Command
}
func (c *Command) Call(args *Args) (err error) {
runCommand, err := c.lookupSubCommand(args)
if err != nil {
ui.Errorln(err)
return
}
if !c.GitExtension {
err = runCommand.parseArguments(args)
if err != nil {
return
}
}
runCommand.Run(runCommand, args)
return
}
func (c *Command) parseArguments(args *Args) (err error) {
c.Flag.SetInterspersed(true)
c.Flag.Init(c.Name(), flag.ContinueOnError)
c.Flag.Usage = func() {
ui.Errorln("")
ui.Errorln(c.Synopsis())
}
if err = c.Flag.Parse(args.Params); err == nil {
for _, arg := range args.Params {
if arg == "--" {
args.Terminator = true
}
}
args.Params = c.Flag.Args()
}
return
}
func (c *Command) FlagPassed(name string) bool {
found := false
c.Flag.Visit(func(f *flag.Flag) {
if f.Name == name {
found = true
}
})
return found
}
func (c *Command) Arg(idx int) string {
args := c.Flag.Args()
if idx < len(args) {
return args[idx]
} else {
return ""
}
}
func (c *Command) Use(subCommand *Command) {
if c.subCommands == nil {
c.subCommands = make(map[string]*Command)
}
c.subCommands[subCommand.Name()] = subCommand
}
func (c *Command) Synopsis() string {
lines := []string{}
usagePrefix := "Usage:"
for _, line := range strings.Split(c.Usage, "\n") {
if line != "" {
usage := fmt.Sprintf("%s hub %s", usagePrefix, line)
usagePrefix = " "
lines = append(lines, usage)
}
}
return strings.Join(lines, "\n")
}
func (c *Command) HelpText() string {
return fmt.Sprintf("%s\n\n%s", c.Synopsis(), strings.Replace(c.Long, "'", "`", -1))
}
func (c *Command) Name() string {
if c.Key != "" {
return c.Key
}
usageLine := strings.Split(strings.TrimSpace(c.Usage), "\n")[0]
return strings.Split(usageLine, " ")[0]
}
func (c *Command) Runnable() bool {
return c.Run != nil
}
func (c *Command) lookupSubCommand(args *Args) (runCommand *Command, err error) {
if len(c.subCommands) > 0 && args.HasSubcommand() {
subCommandName := args.FirstParam()
if subCommand, ok := c.subCommands[subCommandName]; ok {
runCommand = subCommand
args.Params = args.Params[1:]
} else {
err = fmt.Errorf("error: Unknown subcommand: %s", subCommandName)
}
} else {
runCommand = c
}
return
}