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util.go
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util.go
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package prompt
import (
"bufio"
"fmt"
"os"
"strings"
)
func Min(a, b int) int {
if a < b {
return a
}
return b
}
func Max(a, b int) int {
if a < b {
return b
}
return a
}
func Clip(x, a, b int) int {
if x < a {
return a
} else if b < x {
return b
}
return x
}
func matchOption(query, option string) bool {
return strings.Contains(strings.ToLower(option), strings.ToLower(query))
}
func terminalList(label string, options []string, selected, maxLines, scrollOffset int, withQuery bool, exitEnter bool, optionMarkup func(int, int) string, keyPress func(rune, int)) error {
fmt.Printf("%v:", label)
padding := " "
//if 2 < len(label) && len(label) < 20 {
// padding = strings.Repeat(" ", len(label)-2)
//}
// print options
numLines := Min(maxLines, len(options))
if (numLines-1)/2 < scrollOffset {
scrollOffset = (numLines - 1) / 2
}
windowStart := Clip(selected-(numLines-1)/2, 0, len(options)-numLines)
for i := 0; i < numLines; i++ {
fmt.Printf("\n"+padding+optionMarkup(windowStart+i, selected), options[windowStart+i])
}
// go to query
fmt.Printf(escMoveUpN+escMoveToCol, numLines, len(label)+3)
defer func() {
// go to bottom and clear output
fmt.Printf(escMoveStart + escClearLine + strings.Repeat(escMoveDown+escClearLine, numLines))
fmt.Printf(escMoveUpN, numLines)
}()
// option index in current view to option index in options
optionsIndex := make([]int, len(options))
for i := 0; i < len(options); i++ {
optionsIndex[i] = i
}
// make raw and hide input
restore, err := MakeRawTerminal(!withQuery)
if err != nil {
return err
}
defer restore()
pos := 0 // position in query
var prevQuery, query []rune
prevSelected := selected
// read input
input := bufio.NewReader(os.Stdin)
for {
// change query results
if withQuery && string(query) != string(prevQuery) {
fmt.Printf(escMoveStart+escClearLine+"%v: %v"+escMoveToCol, label, string(query), len(label)+3+pos)
i := 0
hasSelected := false
optionsIndex = optionsIndex[:0]
for i < len(options) {
if matchOption(string(query), options[i]) {
if i == selected {
selected = len(optionsIndex)
hasSelected = true
}
optionsIndex = append(optionsIndex, i)
}
i++
}
prevQuery = query
fmt.Printf(escMoveStart + strings.Repeat(escMoveDown+escClearLine, numLines))
if 0 < numLines {
fmt.Printf(escMoveUpN, numLines)
}
numLines = Min(maxLines, len(optionsIndex))
if numLines == 0 {
fmt.Printf("\n" + padding + escRed + "No options found" + escReset)
fmt.Printf(escMoveUp+escMoveToCol, len(label)+3+pos)
prevSelected, selected = 0, 0
} else {
prevSelected = -1
if !hasSelected {
selected = 0
}
}
}
// change selection and move window
if selected != prevSelected {
prevWindowStart := windowStart
if prevSelected == -1 {
windowStart = Clip(selected-(numLines-1)/2, 0, len(optionsIndex)-numLines)
} else if selected < prevSelected && Max(0, selected-scrollOffset) < windowStart {
// move window up
windowStart = Max(0, selected-scrollOffset)
} else if prevSelected < selected && windowStart < Min(selected+scrollOffset+1-numLines, len(optionsIndex)-numLines) {
// move window down
windowStart = Min(selected+scrollOffset+1-numLines, len(optionsIndex)-numLines)
}
if windowStart != prevWindowStart || prevSelected == -1 {
// print all options
for i := 0; i < numLines; i++ {
j := optionsIndex[windowStart+i]
fmt.Printf(escMoveDown+escMoveStart+escClearLine+padding+optionMarkup(j, optionsIndex[selected]), options[j])
}
// go to query
fmt.Printf(escMoveUpN+escMoveToCol, numLines, len(label)+3+pos)
} else {
jPrev, j := optionsIndex[prevSelected], optionsIndex[selected]
fmt.Printf(escMoveDownN+escMoveStart+escClearLine+padding+optionMarkup(jPrev, j), prevSelected-windowStart+1, options[jPrev])
if selected < prevSelected {
fmt.Printf(escMoveUpN, prevSelected-selected)
} else {
fmt.Printf(escMoveDownN, selected-prevSelected)
}
j = optionsIndex[selected]
fmt.Printf(escMoveStart+escClearLine+padding+optionMarkup(j, j), options[j])
// go to query
fmt.Printf(escMoveUpN+escMoveToCol, selected-windowStart+1, len(label)+3+pos)
}
prevSelected = selected
} else if 0 < len(optionsIndex) {
j := optionsIndex[selected]
fmt.Printf(escMoveDownN+escMoveStart+escClearLine+padding+optionMarkup(j, j), selected-windowStart+1, options[j])
// go to query
fmt.Printf(escMoveUpN+escMoveToCol, selected-windowStart+1, len(label)+3+pos)
}
// read user input
var r rune
if r, _, err = input.ReadRune(); err != nil {
return err
}
if r == '\x03' { // interrupt
return keyInterrupt
} else if r == '\x04' || r == '\x26' { // Ctrl+D, Ctrl-Z
keyPress(r, optionsIndex[selected])
return nil
} else if r == ' ' { // return, enter
keyPress(r, optionsIndex[selected])
} else if r == '\r' || r == '\n' { // return, enter
keyPress(r, optionsIndex[selected])
if exitEnter {
return nil
}
} else if r == '\x7F' { // backspace
if pos != 0 {
query = append(query[:pos-1], query[pos:]...)
pos--
fmt.Printf(escMoveLeft+"%v "+strings.Repeat(escMoveLeft, len(query)+1-pos), string(query[pos:]))
}
} else if r == '\x1B' { // escape
if input.Buffered() == 0 {
return nil
} else if r, _, err = input.ReadRune(); err != nil {
return err
} else if r == '[' { // CSI
if input.Buffered() == 0 {
// ignore
} else if r, _, err = input.ReadRune(); err != nil {
return err
} else if r == 'D' { // left
if pos != 0 {
fmt.Printf(escMoveLeft)
pos--
}
} else if r == 'C' { // right
if pos != len(query) {
fmt.Printf(escMoveRight)
pos++
}
} else if r == 'H' { // home
fmt.Printf(strings.Repeat(escMoveLeft, pos))
pos = 0
} else if r == 'F' { // end
fmt.Printf(strings.Repeat(escMoveRight, len(query)-pos))
pos = len(query)
} else if r == 'A' || r == '\x5A' { // up or shift+tab
selected--
if selected < 0 {
if len(optionsIndex) == 0 {
selected = 0
} else {
selected = len(optionsIndex) - 1
}
}
} else if r == 'B' { // down
selected++
if len(optionsIndex) <= selected {
selected = 0
}
} else if r == '3' || r == '5' || r == '6' {
if input.Buffered() == 0 {
// ignore
} else if tilde, _, err := input.ReadRune(); err != nil {
return err
} else if tilde == '~' {
if r == '3' { // delete
if pos != len(query) {
query = append(query[:pos], query[pos+1:]...)
fmt.Printf("%v "+strings.Repeat(escMoveLeft, len(query)+1-pos), string(query[pos:]))
}
} else if r == '5' { // page up
selected -= numLines
if selected < 0 {
selected = 0
}
} else if r == '6' { // page down
selected += numLines
if len(optionsIndex) <= selected {
if len(optionsIndex) == 0 {
selected = 0
} else {
selected = len(optionsIndex) - 1
}
}
}
}
}
}
} else if r == '\t' { // tab
selected++
if len(optionsIndex) <= selected {
selected = 0
}
} else if r == '\x01' { // Ctrl+A - move to start of line
fmt.Printf(strings.Repeat(escMoveLeft, pos))
pos = 0
} else if r == '\x02' { // Ctrl+B - move back
fmt.Printf(escMoveLeft)
pos--
} else if r == '\x05' { // Ctrl+E - move to end of line
fmt.Printf(strings.Repeat(escMoveRight, len(query)-pos))
pos = len(query)
} else if r == '\x06' { // Ctrl+F - move forward
fmt.Printf(escMoveRight)
pos++
} else if r == '\x0B' { // Ctrl+K - delete to end of line
fmt.Printf(strings.Repeat(" ", len(query)-pos))
fmt.Printf(strings.Repeat(escMoveLeft, len(query)-pos))
query = query[:pos]
} else if r == '\x15' { // Ctrl+U - delete to start of line
fmt.Printf(strings.Repeat(escMoveLeft, pos))
fmt.Printf("%v"+strings.Repeat(" ", pos), string(query[pos:]))
fmt.Printf(strings.Repeat(escMoveLeft, len(query)))
query = query[pos:]
pos = 0
} else if withQuery && ' ' <= r {
query = append(query[:pos], append([]rune{r}, query[pos:]...)...)
fmt.Printf("%v"+strings.Repeat(escMoveLeft, len(query)-pos-1), string(query[pos:]))
pos++
}
}
}