mirror of
https://github.com/crazy-max/diun.git
synced 2024-12-22 19:38:28 +00:00
330 lines
8.9 KiB
Go
330 lines
8.9 KiB
Go
package survey
|
|
|
|
import (
|
|
"errors"
|
|
"fmt"
|
|
|
|
"github.com/AlecAivazis/survey/v2/core"
|
|
"github.com/AlecAivazis/survey/v2/terminal"
|
|
)
|
|
|
|
/*
|
|
Select is a prompt that presents a list of various options to the user
|
|
for them to select using the arrow keys and enter. Response type is a string.
|
|
|
|
color := ""
|
|
prompt := &survey.Select{
|
|
Message: "Choose a color:",
|
|
Options: []string{"red", "blue", "green"},
|
|
}
|
|
survey.AskOne(prompt, &color)
|
|
*/
|
|
type Select struct {
|
|
Renderer
|
|
Message string
|
|
Options []string
|
|
Default interface{}
|
|
Help string
|
|
PageSize int
|
|
VimMode bool
|
|
FilterMessage string
|
|
Filter func(filter string, value string, index int) bool
|
|
Description func(value string, index int) string
|
|
filter string
|
|
selectedIndex int
|
|
showingHelp bool
|
|
}
|
|
|
|
// SelectTemplateData is the data available to the templates when processing
|
|
type SelectTemplateData struct {
|
|
Select
|
|
PageEntries []core.OptionAnswer
|
|
SelectedIndex int
|
|
Answer string
|
|
ShowAnswer bool
|
|
ShowHelp bool
|
|
Description func(value string, index int) string
|
|
Config *PromptConfig
|
|
|
|
// These fields are used when rendering an individual option
|
|
CurrentOpt core.OptionAnswer
|
|
CurrentIndex int
|
|
}
|
|
|
|
// IterateOption sets CurrentOpt and CurrentIndex appropriately so a select option can be rendered individually
|
|
func (s SelectTemplateData) IterateOption(ix int, opt core.OptionAnswer) interface{} {
|
|
copy := s
|
|
copy.CurrentIndex = ix
|
|
copy.CurrentOpt = opt
|
|
return copy
|
|
}
|
|
|
|
func (s SelectTemplateData) GetDescription(opt core.OptionAnswer) string {
|
|
if s.Description == nil {
|
|
return ""
|
|
}
|
|
return s.Description(opt.Value, opt.Index)
|
|
}
|
|
|
|
var SelectQuestionTemplate = `
|
|
{{- define "option"}}
|
|
{{- if eq .SelectedIndex .CurrentIndex }}{{color .Config.Icons.SelectFocus.Format }}{{ .Config.Icons.SelectFocus.Text }} {{else}}{{color "default"}} {{end}}
|
|
{{- .CurrentOpt.Value}}{{ if ne ($.GetDescription .CurrentOpt) "" }} - {{color "cyan"}}{{ $.GetDescription .CurrentOpt }}{{end}}
|
|
{{- color "reset"}}
|
|
{{end}}
|
|
{{- 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 }}{{ .FilterMessage }}{{color "reset"}}
|
|
{{- if .ShowAnswer}}{{color "cyan"}} {{.Answer}}{{color "reset"}}{{"\n"}}
|
|
{{- else}}
|
|
{{- " "}}{{- color "cyan"}}[Use arrows to move, type to filter{{- if and .Help (not .ShowHelp)}}, {{ .Config.HelpInput }} for more help{{end}}]{{color "reset"}}
|
|
{{- "\n"}}
|
|
{{- range $ix, $option := .PageEntries}}
|
|
{{- template "option" $.IterateOption $ix $option}}
|
|
{{- end}}
|
|
{{- end}}`
|
|
|
|
// OnChange is called on every keypress.
|
|
func (s *Select) OnChange(key rune, config *PromptConfig) bool {
|
|
options := s.filterOptions(config)
|
|
oldFilter := s.filter
|
|
|
|
// if the user pressed the enter key and the index is a valid option
|
|
if key == terminal.KeyEnter || key == '\n' {
|
|
// if the selected index is a valid option
|
|
if len(options) > 0 && s.selectedIndex < len(options) {
|
|
|
|
// we're done (stop prompting the user)
|
|
return true
|
|
}
|
|
|
|
// we're not done (keep prompting)
|
|
return false
|
|
|
|
// if the user pressed the up arrow or 'k' to emulate vim
|
|
} else if (key == terminal.KeyArrowUp || (s.VimMode && key == 'k')) && len(options) > 0 {
|
|
// if we are at the top of the list
|
|
if s.selectedIndex == 0 {
|
|
// start from the button
|
|
s.selectedIndex = len(options) - 1
|
|
} else {
|
|
// otherwise we are not at the top of the list so decrement the selected index
|
|
s.selectedIndex--
|
|
}
|
|
|
|
// if the user pressed down or 'j' to emulate vim
|
|
} else if (key == terminal.KeyTab || key == terminal.KeyArrowDown || (s.VimMode && key == 'j')) && len(options) > 0 {
|
|
// if we are at the bottom of the list
|
|
if s.selectedIndex == len(options)-1 {
|
|
// start from the top
|
|
s.selectedIndex = 0
|
|
} else {
|
|
// increment the selected index
|
|
s.selectedIndex++
|
|
}
|
|
// only show the help message if we have one
|
|
} else if string(key) == config.HelpInput && s.Help != "" {
|
|
s.showingHelp = true
|
|
// if the user wants to toggle vim mode on/off
|
|
} else if key == terminal.KeyEscape {
|
|
s.VimMode = !s.VimMode
|
|
// if the user hits any of the keys that clear the filter
|
|
} else if key == terminal.KeyDeleteWord || key == terminal.KeyDeleteLine {
|
|
s.filter = ""
|
|
// if the user is deleting a character in the filter
|
|
} else if key == terminal.KeyDelete || key == terminal.KeyBackspace {
|
|
// if there is content in the filter to delete
|
|
if s.filter != "" {
|
|
runeFilter := []rune(s.filter)
|
|
// subtract a line from the current filter
|
|
s.filter = string(runeFilter[0 : len(runeFilter)-1])
|
|
// we removed the last value in the filter
|
|
}
|
|
} else if key >= terminal.KeySpace {
|
|
s.filter += string(key)
|
|
// make sure vim mode is disabled
|
|
s.VimMode = false
|
|
}
|
|
|
|
s.FilterMessage = ""
|
|
if s.filter != "" {
|
|
s.FilterMessage = " " + s.filter
|
|
}
|
|
if oldFilter != s.filter {
|
|
// filter changed
|
|
options = s.filterOptions(config)
|
|
if len(options) > 0 && len(options) <= s.selectedIndex {
|
|
s.selectedIndex = len(options) - 1
|
|
}
|
|
}
|
|
|
|
// figure out the options and index to render
|
|
// figure out the page size
|
|
pageSize := s.PageSize
|
|
// if we dont have a specific one
|
|
if pageSize == 0 {
|
|
// grab the global value
|
|
pageSize = config.PageSize
|
|
}
|
|
|
|
// TODO if we have started filtering and were looking at the end of a list
|
|
// and we have modified the filter then we should move the page back!
|
|
opts, idx := paginate(pageSize, options, s.selectedIndex)
|
|
|
|
tmplData := SelectTemplateData{
|
|
Select: *s,
|
|
SelectedIndex: idx,
|
|
ShowHelp: s.showingHelp,
|
|
Description: s.Description,
|
|
PageEntries: opts,
|
|
Config: config,
|
|
}
|
|
|
|
// render the options
|
|
_ = s.RenderWithCursorOffset(SelectQuestionTemplate, tmplData, opts, idx)
|
|
|
|
// keep prompting
|
|
return false
|
|
}
|
|
|
|
func (s *Select) filterOptions(config *PromptConfig) []core.OptionAnswer {
|
|
// the filtered list
|
|
answers := []core.OptionAnswer{}
|
|
|
|
// if there is no filter applied
|
|
if s.filter == "" {
|
|
return core.OptionAnswerList(s.Options)
|
|
}
|
|
|
|
// the filter to apply
|
|
filter := s.Filter
|
|
if filter == nil {
|
|
filter = config.Filter
|
|
}
|
|
|
|
for i, opt := range s.Options {
|
|
// i the filter says to include the option
|
|
if filter(s.filter, opt, i) {
|
|
answers = append(answers, core.OptionAnswer{
|
|
Index: i,
|
|
Value: opt,
|
|
})
|
|
}
|
|
}
|
|
|
|
// return the list of answers
|
|
return answers
|
|
}
|
|
|
|
func (s *Select) Prompt(config *PromptConfig) (interface{}, error) {
|
|
// if there are no options to render
|
|
if len(s.Options) == 0 {
|
|
// we failed
|
|
return "", errors.New("please provide options to select from")
|
|
}
|
|
|
|
s.selectedIndex = 0
|
|
if s.Default != nil {
|
|
switch defaultValue := s.Default.(type) {
|
|
case string:
|
|
var found bool
|
|
for i, opt := range s.Options {
|
|
if opt == defaultValue {
|
|
s.selectedIndex = i
|
|
found = true
|
|
}
|
|
}
|
|
if !found {
|
|
return "", fmt.Errorf("default value %q not found in options", defaultValue)
|
|
}
|
|
case int:
|
|
if defaultValue >= len(s.Options) {
|
|
return "", fmt.Errorf("default index %d exceeds the number of options", defaultValue)
|
|
}
|
|
s.selectedIndex = defaultValue
|
|
default:
|
|
return "", errors.New("default value of select must be an int or string")
|
|
}
|
|
}
|
|
|
|
// figure out the page size
|
|
pageSize := s.PageSize
|
|
// if we dont have a specific one
|
|
if pageSize == 0 {
|
|
// grab the global value
|
|
pageSize = config.PageSize
|
|
}
|
|
|
|
// figure out the options and index to render
|
|
opts, idx := paginate(pageSize, core.OptionAnswerList(s.Options), s.selectedIndex)
|
|
|
|
cursor := s.NewCursor()
|
|
cursor.Save() // for proper cursor placement during selection
|
|
cursor.Hide() // hide the cursor
|
|
defer cursor.Show() // show the cursor when we're done
|
|
defer cursor.Restore() // clear any accessibility offsetting on exit
|
|
|
|
tmplData := SelectTemplateData{
|
|
Select: *s,
|
|
SelectedIndex: idx,
|
|
Description: s.Description,
|
|
ShowHelp: s.showingHelp,
|
|
PageEntries: opts,
|
|
Config: config,
|
|
}
|
|
|
|
// ask the question
|
|
err := s.RenderWithCursorOffset(SelectQuestionTemplate, tmplData, opts, idx)
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
|
|
rr := s.NewRuneReader()
|
|
_ = rr.SetTermMode()
|
|
defer func() {
|
|
_ = rr.RestoreTermMode()
|
|
}()
|
|
|
|
// start waiting for input
|
|
for {
|
|
r, _, err := rr.ReadRune()
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
if r == terminal.KeyInterrupt {
|
|
return "", terminal.InterruptErr
|
|
}
|
|
if r == terminal.KeyEndTransmission {
|
|
break
|
|
}
|
|
if s.OnChange(r, config) {
|
|
break
|
|
}
|
|
}
|
|
|
|
options := s.filterOptions(config)
|
|
s.filter = ""
|
|
s.FilterMessage = ""
|
|
|
|
if s.selectedIndex < len(options) {
|
|
return options[s.selectedIndex], err
|
|
}
|
|
|
|
return options[0], err
|
|
}
|
|
|
|
func (s *Select) Cleanup(config *PromptConfig, val interface{}) error {
|
|
cursor := s.NewCursor()
|
|
cursor.Restore()
|
|
return s.Render(
|
|
SelectQuestionTemplate,
|
|
SelectTemplateData{
|
|
Select: *s,
|
|
Answer: val.(core.OptionAnswer).Value,
|
|
ShowAnswer: true,
|
|
Description: s.Description,
|
|
Config: config,
|
|
},
|
|
)
|
|
}
|