cobra/bash_completions.go
Eric Paris 0fc734c3c5 Sort the valid args before output
We do this so we get stable repeatable output and can see if updates are
necessary or if it is just golang doing the same thing twice differently
2015-04-13 18:44:05 -04:00

346 lines
8.0 KiB
Go

package cobra
import (
"bytes"
"fmt"
"os"
"sort"
"strings"
"github.com/spf13/pflag"
)
const (
BashCompFilenameExt = "cobra_annotation_bash_completion_filename_extentions"
BashCompOneRequiredFlag = "cobra_annotation_bash_completion_one_required_flag"
)
func preamble(out *bytes.Buffer) {
fmt.Fprintf(out, `#!/bin/bash
__debug()
{
if [[ -n ${BASH_COMP_DEBUG_FILE} ]]; then
echo "$*" >> ${BASH_COMP_DEBUG_FILE}
fi
}
__index_of_word()
{
local w word=$1
shift
index=0
for w in "$@"; do
[[ $w = "$word" ]] && return
index=$((index+1))
done
index=-1
}
__contains_word()
{
local w word=$1; shift
for w in "$@"; do
[[ $w = "$word" ]] && return
done
return 1
}
__handle_reply()
{
__debug "${FUNCNAME}"
case $cur in
-*)
compopt -o nospace
local allflags
if [ ${#must_have_one_flag[@]} -ne 0 ]; then
allflags=("${must_have_one_flag[@]}")
else
allflags=("${flags[*]} ${two_word_flags[*]}")
fi
COMPREPLY=( $(compgen -W "${allflags[*]}" -- "$cur") )
[[ $COMPREPLY == *= ]] || compopt +o nospace
return 0;
;;
esac
# check if we are handling a flag with special work handling
local index
__index_of_word "${prev}" "${flags_with_completion[@]}"
if [[ ${index} -ge 0 ]]; then
${flags_completion[${index}]}
return
fi
# we are parsing a flag and don't have a special handler, no completion
if [[ ${cur} != "${words[cword]}" ]]; then
return
fi
local completions
if [[ ${#must_have_one_flag[@]} -ne 0 ]]; then
completions=("${must_have_one_flag[@]}")
elif [[ ${#must_have_one_noun[@]} -ne 0 ]]; then
completions=("${must_have_one_noun[@]}")
else
completions=("${commands[@]}")
fi
COMPREPLY=( $(compgen -W "${completions[*]}" -- "$cur") )
if [[ ${#COMPREPLY[@]} -eq 0 ]]; then
declare -F __custom_func >/dev/null && __custom_func
fi
}
__handle_flag()
{
__debug "${FUNCNAME}: c is $c words[c] is ${words[c]}"
# if a command required a flag, and we found it, unset must_have_one_flag()
local flagname=${words[c]}
# if the word contained an =
if [[ ${words[c]} == *"="* ]]; then
flagname=${flagname%%=*} # strip everything after the =
flagname="${flagname}=" # but put the = back
fi
__debug "${FUNCNAME}: looking for ${flagname}"
if __contains_word "${flagname}" "${must_have_one_flag[@]}"; then
must_have_one_flag=()
fi
# skip the argument to a two word flag
if __contains_word "${words[c]}" "${two_word_flags[@]}"; then
c=$((c+1))
# if we are looking for a flags value, don't show commands
if [[ $c -eq $cword ]]; then
commands=()
fi
fi
# skip the flag itself
c=$((c+1))
}
__handle_noun()
{
__debug "${FUNCNAME}: c is $c words[c] is ${words[c]}"
if __contains_word "${words[c]}" "${must_have_one_noun[@]}"; then
must_have_one_noun=()
fi
nouns+=("${words[c]}")
c=$((c+1))
}
__handle_command()
{
__debug "${FUNCNAME}: c is $c words[c] is ${words[c]}"
local next_command
if [[ -n ${last_command} ]]; then
next_command="_${last_command}_${words[c]}"
else
next_command="_${words[c]}"
fi
c=$((c+1))
__debug "${FUNCNAME}: looking for ${next_command}"
declare -F $next_command >/dev/null && $next_command
}
__handle_word()
{
if [[ $c -ge $cword ]]; then
__handle_reply
return
fi
__debug "${FUNCNAME}: c is $c words[c] is ${words[c]}"
if [[ "${words[c]}" == -* ]]; then
__handle_flag
elif __contains_word "${words[c]}" "${commands[@]}"; then
__handle_command
else
__handle_noun
fi
__handle_word
}
`)
}
func postscript(out *bytes.Buffer, name string) {
fmt.Fprintf(out, "__start_%s()\n", name)
fmt.Fprintf(out, `{
local cur prev words cword split
_init_completion -s || return
local completions_func
local c=0
local flags=()
local two_word_flags=()
local flags_with_completion=()
local flags_completion=()
local commands=("%s")
local must_have_one_flag=()
local must_have_one_noun=()
local last_command
local nouns=()
__handle_word
}
`, name)
fmt.Fprintf(out, "complete -F __start_%s %s\n", name, name)
fmt.Fprintf(out, "# ex: ts=4 sw=4 et filetype=sh\n")
}
func writeCommands(cmd *Command, out *bytes.Buffer) {
fmt.Fprintf(out, " commands=()\n")
for _, c := range cmd.Commands() {
fmt.Fprintf(out, " commands+=(%q)\n", c.Name())
}
fmt.Fprintf(out, "\n")
}
func writeFlagHandler(name string, annotations map[string][]string, out *bytes.Buffer) {
for key, value := range annotations {
switch key {
case BashCompFilenameExt:
fmt.Fprintf(out, " flags_with_completion+=(%q)\n", name)
ext := strings.Join(value, "|")
ext = "_filedir '@(" + ext + ")'"
fmt.Fprintf(out, " flags_completion+=(%q)\n", ext)
}
}
}
func writeShortFlag(flag *pflag.Flag, out *bytes.Buffer) {
b := (flag.Value.Type() == "bool")
name := flag.Shorthand
format := " "
if !b {
format += "two_word_"
}
format += "flags+=(\"-%s\")\n"
fmt.Fprintf(out, format, name)
writeFlagHandler("-"+name, flag.Annotations, out)
}
func writeFlag(flag *pflag.Flag, out *bytes.Buffer) {
b := (flag.Value.Type() == "bool")
name := flag.Name
format := " flags+=(\"--%s"
if !b {
format += "="
}
format += "\")\n"
fmt.Fprintf(out, format, name)
writeFlagHandler("--"+name, flag.Annotations, out)
}
func writeFlags(cmd *Command, out *bytes.Buffer) {
fmt.Fprintf(out, ` flags=()
two_word_flags=()
flags_with_completion=()
flags_completion=()
`)
cmd.NonInheritedFlags().VisitAll(func(flag *pflag.Flag) {
writeFlag(flag, out)
if len(flag.Shorthand) > 0 {
writeShortFlag(flag, out)
}
})
fmt.Fprintf(out, "\n")
}
func writeRequiredFlag(cmd *Command, out *bytes.Buffer) {
fmt.Fprintf(out, " must_have_one_flag=()\n")
flags := cmd.NonInheritedFlags()
flags.VisitAll(func(flag *pflag.Flag) {
for key, _ := range flag.Annotations {
switch key {
case BashCompOneRequiredFlag:
format := " must_have_one_flag+=(\"--%s"
b := (flag.Value.Type() == "bool")
if !b {
format += "="
}
format += "\")\n"
fmt.Fprintf(out, format, flag.Name)
if len(flag.Shorthand) > 0 {
fmt.Fprintf(out, " must_have_one_flag+=(\"-%s\")\n", flag.Shorthand)
}
}
}
})
}
func writeRequiredNoun(cmd *Command, out *bytes.Buffer) {
fmt.Fprintf(out, " must_have_one_noun=()\n")
sort.Sort(sort.StringSlice(cmd.ValidArgs))
for _, value := range cmd.ValidArgs {
fmt.Fprintf(out, " must_have_one_noun+=(%q)\n", value)
}
}
func gen(cmd *Command, out *bytes.Buffer) {
for _, c := range cmd.Commands() {
gen(c, out)
}
commandName := cmd.CommandPath()
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")
}
func (cmd *Command) GenBashCompletion(out *bytes.Buffer) {
preamble(out)
if len(cmd.BashCompletionFunction) > 0 {
fmt.Fprintf(out, "%s\n", cmd.BashCompletionFunction)
}
gen(cmd, out)
postscript(out, 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
}
func (cmd *Command) MarkFlagRequired(name string) {
flag := cmd.Flags().Lookup(name)
if flag == nil {
return
}
if flag.Annotations == nil {
flag.Annotations = make(map[string][]string)
}
annotation := make([]string, 1)
annotation[0] = "true"
flag.Annotations[BashCompOneRequiredFlag] = annotation
}