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Copy pathfish.go
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179 lines (154 loc) · 4 KB
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package cli
import (
"bytes"
"fmt"
"io"
"strings"
"text/template"
)
// ToFishCompletion creates a fish completion string for the `*App`
// The function errors if either parsing or writing of the string fails.
func (cmd *Command) ToFishCompletion() (string, error) {
var w bytes.Buffer
if err := cmd.writeFishCompletionTemplate(&w); err != nil {
return "", err
}
return w.String(), nil
}
type fishCommandCompletionTemplate struct {
Command *Command
Completions []string
AllCommands []string
}
func (cmd *Command) writeFishCompletionTemplate(w io.Writer) error {
const name = "cli"
t, err := template.New(name).Parse(FishCompletionTemplate)
if err != nil {
return err
}
allCommands := []string{}
// Add global flags
completions := cmd.prepareFishFlags(cmd.VisibleFlags(), allCommands)
// Add help flag
if !cmd.HideHelp {
completions = append(
completions,
cmd.prepareFishFlags([]Flag{HelpFlag}, allCommands)...,
)
}
// Add version flag
if !cmd.HideVersion {
completions = append(
completions,
cmd.prepareFishFlags([]Flag{VersionFlag}, allCommands)...,
)
}
// Add commands and their flags
completions = append(
completions,
cmd.prepareFishCommands(cmd.VisibleCommands(), &allCommands, []string{})...,
)
return t.ExecuteTemplate(w, name, &fishCommandCompletionTemplate{
Command: cmd,
Completions: completions,
AllCommands: allCommands,
})
}
func (cmd *Command) prepareFishCommands(commands []*Command, allCommands *[]string, previousCommands []string) []string {
completions := []string{}
for _, command := range commands {
var completion strings.Builder
completion.WriteString(fmt.Sprintf(
"complete -r -c %s -n '%s' -a '%s'",
cmd.Name,
cmd.fishSubcommandHelper(previousCommands),
strings.Join(command.Names(), " "),
))
if command.Usage != "" {
completion.WriteString(fmt.Sprintf(" -d '%s'",
escapeSingleQuotes(command.Usage)))
}
if !command.HideHelp {
completions = append(
completions,
cmd.prepareFishFlags([]Flag{HelpFlag}, command.Names())...,
)
}
*allCommands = append(*allCommands, command.Names()...)
completions = append(completions, completion.String())
completions = append(
completions,
cmd.prepareFishFlags(command.VisibleFlags(), command.Names())...,
)
// recursively iterate subcommands
if len(command.Commands) > 0 {
completions = append(
completions,
cmd.prepareFishCommands(
command.Commands, allCommands, command.Names(),
)...,
)
}
}
return completions
}
func (cmd *Command) prepareFishFlags(flags []Flag, previousCommands []string) []string {
completions := []string{}
for _, f := range flags {
completion := &strings.Builder{}
completion.WriteString(fmt.Sprintf(
"complete -c %s -n '%s'",
cmd.Name,
cmd.fishSubcommandHelper(previousCommands),
))
fishAddFileFlag(f, completion)
for idx, opt := range f.Names() {
if idx == 0 {
completion.WriteString(fmt.Sprintf(
" -l %s", strings.TrimSpace(opt),
))
} else {
completion.WriteString(fmt.Sprintf(
" -s %s", strings.TrimSpace(opt),
))
}
}
if flag, ok := f.(DocGenerationFlag); ok {
if flag.TakesValue() {
completion.WriteString(" -r")
}
if flag.GetUsage() != "" {
completion.WriteString(fmt.Sprintf(" -d '%s'",
escapeSingleQuotes(flag.GetUsage())))
}
}
completions = append(completions, completion.String())
}
return completions
}
func fishAddFileFlag(flag Flag, completion *strings.Builder) {
switch f := flag.(type) {
case *StringFlag:
if f.TakesFile {
return
}
case *StringSliceFlag:
if f.TakesFile {
return
}
}
completion.WriteString(" -f")
}
func (cmd *Command) fishSubcommandHelper(allCommands []string) string {
fishHelper := fmt.Sprintf("__fish_%s_no_subcommand", cmd.Name)
if len(allCommands) > 0 {
fishHelper = fmt.Sprintf(
"__fish_seen_subcommand_from %s",
strings.Join(allCommands, " "),
)
}
return fishHelper
}
func escapeSingleQuotes(input string) string {
return strings.Replace(input, `'`, `\'`, -1)
}