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shell.go
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shell.go
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package ext
import (
"bytes"
"fmt"
"io/ioutil"
"os"
"path/filepath"
"text/template"
"github.com/akeylesslabs/cli"
)
// InstallBashCompletion install bash_completion
func InstallBashCompletion(root *cli.Command) error {
if root.Name == "" {
return fmt.Errorf("root command's name is empty")
}
compFilename := "." + root.Name + "_compeltion"
compFilepath := filepath.Join(os.Getenv("HOME"), compFilename)
compFile, err := os.OpenFile(compFilepath, os.O_WRONLY|os.O_TRUNC|os.O_CREATE, 0666)
if err != nil {
return err
}
buff, err := genBashCompletion(root)
if err != nil {
return err
}
if _, err := compFile.Write(buff.Bytes()); err != nil {
return err
}
bashrcFiles := []string{
".bashrc",
".bash_profile",
}
var dstFile *os.File
for _, bashFilename := range bashrcFiles {
dstFilepath := filepath.Join(os.Getenv("HOME"), bashFilename)
dstFile, err = os.OpenFile(dstFilepath, os.O_CREATE|os.O_APPEND|os.O_RDWR, 0666)
if err == nil {
break
}
}
if dstFile == nil {
return fmt.Errorf("no destination bash file")
}
data, err := ioutil.ReadAll(dstFile)
if err != nil {
return err
}
subslice := fmt.Sprintf("[ -f ~/%s ] && . ~/%s", compFilename, compFilename)
if !bytes.Contains(data, []byte(subslice)) {
_, err = dstFile.WriteString("\n#Auto-generated by cli\n" + subslice)
}
return err
}
func genBashCompletion(root *cli.Command) (*bytes.Buffer, error) {
buff := bytes.NewBufferString("")
t, err := template.New("bash_completion").Parse(shellTemplateText)
if err != nil {
return nil, err
}
return buff, t.Execute(buff, struct {
Cli string
CompleteFn string
}{Cli: root.Name, CompleteFn: genCompleteFn(root)})
}
func genCompleteFn(root *cli.Command) string {
return "TODO=true"
}
const shellTemplateText = `# {{.Cli}} command completion script
COMP_WORDBREAKS=${COMP_WORDBREAKS/=/}
COMP_WORDBREAKS=${COMP_WORDBREAKS/@/}
export COMP_WORDBREAKS
__complete_fn() {
#COMP_CWORD
#COMP_LINE
#COMP_POINT
#COMP_WORDS
#{{.Cli}} completion -- "${COMP_WORDS[@]}"
{{.CompleteFn}}
}
if type complete &>/dev/null; then
_{{.Cli}}_completion () {
local si="$IFS"
IFS=$'\n' COMPREPLY=($(__complete_fn \
2>/dev/null)) || return $?
IFS="$si"
}
complete -F _{{.Cli}}_completion {{.Cli}}
elif type compdef &>/dev/null; then
_{{.Cli}}_completion() {
si=$IFS
compadd -- $(COMP_CWORD=$((CURRENT-1)) \
COMP_LINE=$BUFFER \
COMP_POINT=0 \
COMP_WORDS="${words[@]}" \
__complete_fn \
2>/dev/null)
IFS=$si
}
compdef _{{.Cli}}_completion {{.Cli}}
elif type compctl &>/dev/null; then
_{{.Cli}}_completion () {
local cword line point words si
read -Ac words
read -cn cword
let cword-=1
read -l line
read -ln point
si="$IFS"
IFS=$'\n' reply=($(COMP_CWORD="$cword" \
COMP_LINE="$line" \
COMP_POINT="$point" \
COMP_WORDS="${words[@]}" \
__complete_fn \
2>/dev/null)) || return $?
IFS="$si"
}
compctl -K _{{.Cli}}_completion {{.Cli}}
fi
`