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main.go
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package cobracompletefig
import (
"fmt"
"strings"
"github.com/spf13/cobra"
"github.com/spf13/pflag"
)
var includeHidden bool
var figGenCmdUse string = ""
var generateCommandArgs func(*cobra.Command) Args
type Opts struct {
Use string
Short string
Visible bool
Long string
commandArgGenerator func(*cobra.Command) Args
}
func CreateCompletionSpecCommand(options ...Opts) * cobra.Command {
Use := "generate-fig-spec"
Aliases := []string{"generateFigSpec", "genFigSpec"}
Short := "Generate a fig spec"
Hidden := true
Long := `
Fig is a tool for your command line that adds autocomplete.
This command generates a TypeScript file with the skeleton
Fig autocomplete spec for your Cobra CLI.
`
if len(options) > 0 {
if options[0].Use != "" {
Use = options[0].Use
}
if options[0].Short != "" {
Short = options[0].Short
}
if options[0].Long != "" {
Long = options[0].Long
}
if options[0].Visible {
Hidden = false
}
if options[0].commandArgGenerator != nil {
generateCommandArgs = options[0].commandArgGenerator
}
}
figGenCmdUse = Use
var cmd = &cobra.Command{
Use: Use,
Aliases: Aliases,
Short: Short,
Hidden: Hidden,
Long: Long,
Run: func(cmd *cobra.Command, args []string) {
root := cmd.Root()
spec := GenerateCompletionSpec(root)
fmt.Println(spec.ToTypescript())
},
}
cmd.Flags().BoolVar(
&includeHidden, "include-hidden", false,
"Include hidden commands in generated Fig autocomplete spec")
return cmd
}
func GenerateCompletionSpec(root *cobra.Command) Spec {
opts := append(options(root.LocalNonPersistentFlags(), false), options(root.PersistentFlags(), true)...)
opts = append(opts, makeHelpOption())
spec := Spec{
Subcommand: &Subcommand{
BaseSuggestion: &BaseSuggestion{
description: root.Short,
},
options: opts,
subcommands: append(subcommands(root, false, Options{}), makeHelpCommand(root)), // We assume CLI is using default help command
args: commandArguments(root),
},
name: root.Name(),
}
return spec
}
func subcommands(cmd *cobra.Command, overrideOptions bool, overrides Options) Subcommands {
var subs []Subcommand
for _, sub := range cmd.Commands() {
if sub.Name() == "help" || (!includeHidden && sub.Hidden) || (sub.Use == figGenCmdUse) {
continue
}
var opts Options
if overrideOptions {
opts = overrides
} else {
opts = append(options(sub.LocalNonPersistentFlags(), false), options(sub.PersistentFlags(), true)...)
}
subs = append(subs, Subcommand{
BaseSuggestion: &BaseSuggestion{
description: sub.Short,
hidden: sub.Hidden,
},
name: append(sub.Aliases, sub.Name()),
options: opts,
subcommands: subcommands(sub, overrideOptions, overrides),
args: commandArguments(sub),
})
}
return subs
}
func isFlagRepeatable(flag *pflag.Flag) bool {
return strings.Contains(flag.Value.Type(), "Slice") || strings.Contains(flag.Value.Type(), "Array")
}
func options(flagSet *pflag.FlagSet, persistent bool) []Option {
var opts []Option
attachFlags := func(flag *pflag.Flag) {
option := Option{
BaseSuggestion: &BaseSuggestion{
description: flag.Usage,
hidden: flag.Hidden,
},
name: []string{fmt.Sprintf("--%v", flag.Name)},
isRepeatable: isFlagRepeatable(flag),
}
if flag.Shorthand != "" {
option.name = append(option.name, fmt.Sprintf("-%v", flag.Shorthand))
}
if persistent != false {
option.isPersistent = true
}
requiredAnnotation, found := flag.Annotations[cobra.BashCompOneRequiredFlag]
if found && requiredAnnotation[0] == "true" {
option.isRequired = true
}
option.args = flagArguments(flag)
opts = append(opts, option)
}
flagSet.VisitAll(attachFlags)
return opts
}
/*
* In Cobra, you only specify the number of arguments.
* Not sure how we want to handle this (if at all)
* https://github.com/spf13/cobra/blob/v1.2.1/user_guide.md#positional-and-custom-arguments
*/
func commandArguments(cmd *cobra.Command) []Arg {
if generateCommandArgs != nil {
return generateCommandArgs(cmd)
}
return []Arg{}
}
func flagArguments(flag *pflag.Flag) []Arg {
var args []Arg
defaultVal := flag.DefValue
if defaultVal == "[]" {
defaultVal = ""
}
if flag.Value.Type() != "bool" {
arg := Arg{
name: flag.Name,
defaultVal: defaultVal,
}
_, foundFilenameAnnotation := flag.Annotations[cobra.BashCompFilenameExt]
if foundFilenameAnnotation {
arg.template = append(arg.template, FILEPATHS)
}
_, foundDirectoryAnnotation := flag.Annotations[cobra.BashCompSubdirsInDir]
if foundDirectoryAnnotation {
arg.template = append(arg.template, FOLDERS)
}
args = append(args, arg)
}
return args
}
func makeHelpCommand(root *cobra.Command) Subcommand {
return Subcommand{
BaseSuggestion: &BaseSuggestion{
description: "Help about any command",
},
name: []string{"help"},
subcommands: subcommands(root, true, []Option{}),
}
}
func makeHelpOption() Option {
return Option{
BaseSuggestion: &BaseSuggestion{
description: fmt.Sprintf("Display help"),
},
isPersistent: true,
name: []string{"--help", "-h"},
}
}