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editor.go
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editor.go
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package survey
import (
"bytes"
"io/ioutil"
"os"
"os/exec"
"runtime"
"github.com/AlecAivazis/survey/v2/terminal"
shellquote "github.com/kballard/go-shellquote"
)
/*
Editor launches an instance of the users preferred editor on a temporary file.
The editor to use is determined by reading the $VISUAL or $EDITOR environment
variables. If neither of those are present, notepad (on Windows) or vim
(others) is used.
The launch of the editor is triggered by the enter key. Since the response may
be long, it will not be echoed as Input does, instead, it print <Received>.
Response type is a string.
message := ""
prompt := &survey.Editor{ Message: "What is your commit message?" }
survey.AskOne(prompt, &message)
*/
type Editor struct {
Renderer
Message string
Default string
Help string
Editor string
HideDefault bool
AppendDefault bool
FileName string
}
// data available to the templates when processing
type EditorTemplateData struct {
Editor
Answer string
ShowAnswer bool
ShowHelp bool
Config *PromptConfig
}
// Templates with Color formatting. See Documentation: https://github.com/mgutz/ansi#style-format
var EditorQuestionTemplate = `
{{- if .ShowHelp }}{{- color .Config.Icons.Help.Format }}{{ .Config.Icons.Help.Text }} {{ .Help }}{{color "reset"}}{{"\n"}}{{end}}
{{- color .Config.Icons.Question.Format }}{{ .Config.Icons.Question.Text }} {{color "reset"}}
{{- color "default+hb"}}{{ .Message }} {{color "reset"}}
{{- if .ShowAnswer}}
{{- color "cyan"}}{{.Answer}}{{color "reset"}}{{"\n"}}
{{- else }}
{{- if and .Help (not .ShowHelp)}}{{color "cyan"}}[{{ .Config.HelpInput }} for help]{{color "reset"}} {{end}}
{{- if and .Default (not .HideDefault)}}{{color "white"}}({{.Default}}) {{color "reset"}}{{end}}
{{- color "cyan"}}[Enter to launch editor] {{color "reset"}}
{{- end}}`
var (
bom = []byte{0xef, 0xbb, 0xbf}
editor = "vim"
)
func init() {
if runtime.GOOS == "windows" {
editor = "notepad"
}
if v := os.Getenv("VISUAL"); v != "" {
editor = v
} else if e := os.Getenv("EDITOR"); e != "" {
editor = e
}
}
func (e *Editor) PromptAgain(config *PromptConfig, invalid interface{}, err error) (interface{}, error) {
initialValue := invalid.(string)
return e.prompt(initialValue, config)
}
func (e *Editor) Prompt(config *PromptConfig) (interface{}, error) {
initialValue := ""
if e.Default != "" && e.AppendDefault {
initialValue = e.Default
}
return e.prompt(initialValue, config)
}
func (e *Editor) prompt(initialValue string, config *PromptConfig) (interface{}, error) {
// render the template
err := e.Render(
EditorQuestionTemplate,
EditorTemplateData{
Editor: *e,
Config: config,
},
)
if err != nil {
return "", err
}
// start reading runes from the standard in
rr := e.NewRuneReader()
_ = rr.SetTermMode()
defer func() {
_ = rr.RestoreTermMode()
}()
cursor := e.NewCursor()
cursor.Hide()
defer cursor.Show()
for {
r, _, err := rr.ReadRune()
if err != nil {
return "", err
}
if r == '\r' || r == '\n' {
break
}
if r == terminal.KeyInterrupt {
return "", terminal.InterruptErr
}
if r == terminal.KeyEndTransmission {
break
}
if string(r) == config.HelpInput && e.Help != "" {
err = e.Render(
EditorQuestionTemplate,
EditorTemplateData{
Editor: *e,
ShowHelp: true,
Config: config,
},
)
if err != nil {
return "", err
}
}
continue
}
// prepare the temp file
pattern := e.FileName
if pattern == "" {
pattern = "survey*.txt"
}
f, err := ioutil.TempFile("", pattern)
if err != nil {
return "", err
}
defer func() {
_ = os.Remove(f.Name())
}()
// write utf8 BOM header
// The reason why we do this is because notepad.exe on Windows determines the
// encoding of an "empty" text file by the locale, for example, GBK in China,
// while golang string only handles utf8 well. However, a text file with utf8
// BOM header is not considered "empty" on Windows, and the encoding will then
// be determined utf8 by notepad.exe, instead of GBK or other encodings.
if _, err := f.Write(bom); err != nil {
return "", err
}
// write initial value
if _, err := f.WriteString(initialValue); err != nil {
return "", err
}
// close the fd to prevent the editor unable to save file
if err := f.Close(); err != nil {
return "", err
}
// check is input editor exist
if e.Editor != "" {
editor = e.Editor
}
stdio := e.Stdio()
args, err := shellquote.Split(editor)
if err != nil {
return "", err
}
args = append(args, f.Name())
// open the editor
cmd := exec.Command(args[0], args[1:]...)
cmd.Stdin = stdio.In
cmd.Stdout = stdio.Out
cmd.Stderr = stdio.Err
cursor.Show()
if err := cmd.Run(); err != nil {
return "", err
}
// raw is a BOM-unstripped UTF8 byte slice
raw, err := ioutil.ReadFile(f.Name())
if err != nil {
return "", err
}
// strip BOM header
text := string(bytes.TrimPrefix(raw, bom))
// check length, return default value on empty
if len(text) == 0 && !e.AppendDefault {
return e.Default, nil
}
return text, nil
}
func (e *Editor) Cleanup(config *PromptConfig, val interface{}) error {
return e.Render(
EditorQuestionTemplate,
EditorTemplateData{
Editor: *e,
Answer: "<Received>",
ShowAnswer: true,
Config: config,
},
)
}