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Merge pull request #215 from mvdan/interfacer 

Replace *bytes.Buffer with io.Writer
This commit is contained in:
Eric Paris 2016-01-05 16:50:52 -05:00
parent c6399cd398 e0479ff7a7
commit c82a0ceef8
1 changed files with 146 additions and 63 deletions
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209
bash_completions.go
View File

@ -1,8 +1,8 @@
package cobra
import (
"bytes"
"fmt"
"io"
"os"
"sort"
"strings"
@ -16,8 +16,8 @@ const (
BashCompSubdirsInDir = "cobra_annotation_bash_completion_subdirs_in_dir"
)
func preamble(out *bytes.Buffer) {
fmt.Fprintf(out, `#!/bin/bash
func preamble(out io.Writer) error {
_, err := fmt.Fprintf(out, `#!/bin/bash
__debug()
{
@ -205,12 +205,16 @@ __handle_word()
}
`)
return err
}
func postscript(out *bytes.Buffer, name string) {
func postscript(w io.Writer, name string) error {
name = strings.Replace(name, ":", "__", -1)
fmt.Fprintf(out, "__start_%s()\n", name)
fmt.Fprintf(out, `{
_, err := fmt.Fprintf(w, "__start_%s()\n", name)
if err != nil {
return err
}
_, err = fmt.Fprintf(w, `{
local cur prev words cword
declare -A flaghash
if declare -F _init_completion >/dev/null 2>&1; then
@ -234,55 +238,77 @@ func postscript(out *bytes.Buffer, name string) {
}
`, name)
fmt.Fprintf(out, `if [[ $(type -t compopt) = "builtin" ]]; then
if err != nil {
return err
}
_, err = fmt.Fprintf(w, `if [[ $(type -t compopt) = "builtin" ]]; then
complete -o default -F __start_%s %s
else
complete -o default -o nospace -F __start_%s %s
fi
`, name, name, name, name)
fmt.Fprintf(out, "# ex: ts=4 sw=4 et filetype=sh\n")
if err != nil {
return err
}
_, err = fmt.Fprintf(w, "# ex: ts=4 sw=4 et filetype=sh\n")
return err
}
func writeCommands(cmd *Command, out *bytes.Buffer) {
fmt.Fprintf(out, " commands=()\n")
func writeCommands(cmd *Command, w io.Writer) error {
if _, err := fmt.Fprintf(w, " commands=()\n"); err != nil {
return err
}
for _, c := range cmd.Commands() {
if !c.IsAvailableCommand() || c == cmd.helpCommand {
continue
}
fmt.Fprintf(out, " commands+=(%q)\n", c.Name())
if _, err := fmt.Fprintf(w, " commands+=(%q)\n", c.Name()); err != nil {
return err
}
fmt.Fprintf(out, "\n")
}
_, err := fmt.Fprintf(w, "\n")
return err
}
func writeFlagHandler(name string, annotations map[string][]string, out *bytes.Buffer) {
func writeFlagHandler(name string, annotations map[string][]string, w io.Writer) error {
for key, value := range annotations {
switch key {
case BashCompFilenameExt:
fmt.Fprintf(out, " flags_with_completion+=(%q)\n", name)
_, err := fmt.Fprintf(w, " flags_with_completion+=(%q)\n", name)
if err != nil {
return err
}
if len(value) > 0 {
ext := "__handle_filename_extension_flag " + strings.Join(value, "|")
fmt.Fprintf(out, " flags_completion+=(%q)\n", ext)
_, err = fmt.Fprintf(w, " flags_completion+=(%q)\n", ext)
} else {
ext := "_filedir"
fmt.Fprintf(out, " flags_completion+=(%q)\n", ext)
_, err = fmt.Fprintf(w, " flags_completion+=(%q)\n", ext)
}
if err != nil {
return err
}
case BashCompSubdirsInDir:
fmt.Fprintf(out, " flags_with_completion+=(%q)\n", name)
_, err := fmt.Fprintf(w, " flags_with_completion+=(%q)\n", name)
if len(value) == 1 {
ext := "__handle_subdirs_in_dir_flag " + value[0]
fmt.Fprintf(out, " flags_completion+=(%q)\n", ext)
_, err = fmt.Fprintf(w, " flags_completion+=(%q)\n", ext)
} else {
ext := "_filedir -d"
fmt.Fprintf(out, " flags_completion+=(%q)\n", ext)
_, err = fmt.Fprintf(w, " flags_completion+=(%q)\n", ext)
}
if err != nil {
return err
}
}
}
return nil
}
func writeShortFlag(flag *pflag.Flag, out *bytes.Buffer) {
func writeShortFlag(flag *pflag.Flag, w io.Writer) error {
b := (flag.Value.Type() == "bool")
name := flag.Shorthand
format := " "
@ -290,11 +316,13 @@ func writeShortFlag(flag *pflag.Flag, out *bytes.Buffer) {
format += "two_word_"
}
format += "flags+=(\"-%s\")\n"
fmt.Fprintf(out, format, name)
writeFlagHandler("-"+name, flag.Annotations, out)
if _, err := fmt.Fprintf(w, format, name); err != nil {
return err
}
return writeFlagHandler("-"+name, flag.Annotations, w)
}
func writeFlag(flag *pflag.Flag, out *bytes.Buffer) {
func writeFlag(flag *pflag.Flag, w io.Writer) error {
b := (flag.Value.Type() == "bool")
name := flag.Name
format := " flags+=(\"--%s"
@ -302,36 +330,64 @@ func writeFlag(flag *pflag.Flag, out *bytes.Buffer) {
format += "="
}
format += "\")\n"
fmt.Fprintf(out, format, name)
writeFlagHandler("--"+name, flag.Annotations, out)
if _, err := fmt.Fprintf(w, format, name); err != nil {
return err
}
return writeFlagHandler("--"+name, flag.Annotations, w)
}
func writeFlags(cmd *Command, out *bytes.Buffer) {
fmt.Fprintf(out, ` flags=()
func writeFlags(cmd *Command, w io.Writer) error {
_, err := fmt.Fprintf(w, ` flags=()
two_word_flags=()
flags_with_completion=()
flags_completion=()
`)
if err != nil {
return err
}
var visitErr error
cmd.NonInheritedFlags().VisitAll(func(flag *pflag.Flag) {
writeFlag(flag, out)
if err := writeFlag(flag, w); err != nil {
visitErr = err
return
}
if len(flag.Shorthand) > 0 {
writeShortFlag(flag, out)
if err := writeShortFlag(flag, w); err != nil {
visitErr = err
return
}
}
})
if visitErr != nil {
return visitErr
}
cmd.InheritedFlags().VisitAll(func(flag *pflag.Flag) {
writeFlag(flag, out)
if err := writeFlag(flag, w); err != nil {
visitErr = err
return
}
if len(flag.Shorthand) > 0 {
writeShortFlag(flag, out)
if err := writeShortFlag(flag, w); err != nil {
visitErr = err
return
}
}
})
if visitErr != nil {
return visitErr
}
fmt.Fprintf(out, "\n")
_, err = fmt.Fprintf(w, "\n")
return err
}
func writeRequiredFlag(cmd *Command, out *bytes.Buffer) {
fmt.Fprintf(out, " must_have_one_flag=()\n")
func writeRequiredFlag(cmd *Command, w io.Writer) error {
if _, err := fmt.Fprintf(w, " must_have_one_flag=()\n"); err != nil {
return err
}
flags := cmd.NonInheritedFlags()
var visitErr error
flags.VisitAll(func(flag *pflag.Flag) {
for key := range flag.Annotations {
switch key {
@ -342,68 +398,95 @@ func writeRequiredFlag(cmd *Command, out *bytes.Buffer) {
format += "="
}
format += "\")\n"
fmt.Fprintf(out, format, flag.Name)
if _, err := fmt.Fprintf(w, format, flag.Name); err != nil {
visitErr = err
return
}
if len(flag.Shorthand) > 0 {
fmt.Fprintf(out, " must_have_one_flag+=(\"-%s\")\n", flag.Shorthand)
if _, err := fmt.Fprintf(w, " must_have_one_flag+=(\"-%s\")\n", flag.Shorthand); err != nil {
visitErr = err
return
}
}
}
}
})
return visitErr
}
func writeRequiredNoun(cmd *Command, out *bytes.Buffer) {
fmt.Fprintf(out, " must_have_one_noun=()\n")
func writeRequiredNoun(cmd *Command, w io.Writer) error {
if _, err := fmt.Fprintf(w, " must_have_one_noun=()\n"); err != nil {
return err
}
sort.Sort(sort.StringSlice(cmd.ValidArgs))
for _, value := range cmd.ValidArgs {
fmt.Fprintf(out, " must_have_one_noun+=(%q)\n", value)
if _, err := fmt.Fprintf(w, " must_have_one_noun+=(%q)\n", value); err != nil {
return err
}
}
return nil
}
func gen(cmd *Command, out *bytes.Buffer) {
func gen(cmd *Command, w io.Writer) error {
for _, c := range cmd.Commands() {
if !c.IsAvailableCommand() || c == cmd.helpCommand {
continue
}
gen(c, out)
if err := gen(c, w); err != nil {
return err
}
}
commandName := cmd.CommandPath()
commandName = strings.Replace(commandName, " ", "_", -1)
commandName = strings.Replace(commandName, ":", "__", -1)
fmt.Fprintf(out, "_%s()\n{\n", commandName)
fmt.Fprintf(out, " last_command=%q\n", commandName)
writeCommands(cmd, out)
writeFlags(cmd, out)
writeRequiredFlag(cmd, out)
writeRequiredNoun(cmd, out)
fmt.Fprintf(out, "}\n\n")
if _, err := fmt.Fprintf(w, "_%s()\n{\n", commandName); err != nil {
return err
}
if _, err := fmt.Fprintf(w, " last_command=%q\n", commandName); err != nil {
return err
}
if err := writeCommands(cmd, w); err != nil {
return err
}
if err := writeFlags(cmd, w); err != nil {
return err
}
if err := writeRequiredFlag(cmd, w); err != nil {
return err
}
if err := writeRequiredNoun(cmd, w); err != nil {
return err
}
if _, err := fmt.Fprintf(w, "}\n\n"); err != nil {
return err
}
return nil
}
func (cmd *Command) GenBashCompletion(out *bytes.Buffer) {
preamble(out)
if len(cmd.BashCompletionFunction) > 0 {
fmt.Fprintf(out, "%s\n", cmd.BashCompletionFunction)
func (cmd *Command) GenBashCompletion(w io.Writer) error {
if err := preamble(w); err != nil {
return err
}
gen(cmd, out)
postscript(out, cmd.Name())
if len(cmd.BashCompletionFunction) > 0 {
if _, err := fmt.Fprintf(w, "%s\n", cmd.BashCompletionFunction); err != nil {
return err
}
}
if err := gen(cmd, w); err != nil {
return err
}
return postscript(w, cmd.Name())
}
func (cmd *Command) GenBashCompletionFile(filename string) error {
out := new(bytes.Buffer)
cmd.GenBashCompletion(out)
outFile, err := os.Create(filename)
if err != nil {
return err
}
defer outFile.Close()
_, err = outFile.Write(out.Bytes())
if err != nil {
return err
}
return nil
return cmd.GenBashCompletion(outFile)
}
// MarkFlagRequired adds the BashCompOneRequiredFlag annotation to the named flag, if it exists.