diff options
Diffstat (limited to 'Godeps/_workspace/src/github.com/peterh/liner/line.go')
| -rw-r--r-- | Godeps/_workspace/src/github.com/peterh/liner/line.go | 1018 |
1 files changed, 0 insertions, 1018 deletions
diff --git a/Godeps/_workspace/src/github.com/peterh/liner/line.go b/Godeps/_workspace/src/github.com/peterh/liner/line.go deleted file mode 100644 index 95364ae56..000000000 --- a/Godeps/_workspace/src/github.com/peterh/liner/line.go +++ /dev/null @@ -1,1018 +0,0 @@ -// +build windows linux darwin openbsd freebsd netbsd - -package liner - -import ( - "container/ring" - "errors" - "fmt" - "io" - "strings" - "unicode" - "unicode/utf8" -) - -type action int - -const ( - left action = iota - right - up - down - home - end - insert - del - pageUp - pageDown - f1 - f2 - f3 - f4 - f5 - f6 - f7 - f8 - f9 - f10 - f11 - f12 - altB - altF - altY - shiftTab - wordLeft - wordRight - winch - unknown -) - -const ( - ctrlA = 1 - ctrlB = 2 - ctrlC = 3 - ctrlD = 4 - ctrlE = 5 - ctrlF = 6 - ctrlG = 7 - ctrlH = 8 - tab = 9 - lf = 10 - ctrlK = 11 - ctrlL = 12 - cr = 13 - ctrlN = 14 - ctrlO = 15 - ctrlP = 16 - ctrlQ = 17 - ctrlR = 18 - ctrlS = 19 - ctrlT = 20 - ctrlU = 21 - ctrlV = 22 - ctrlW = 23 - ctrlX = 24 - ctrlY = 25 - ctrlZ = 26 - esc = 27 - bs = 127 -) - -const ( - beep = "\a" -) - -type tabDirection int - -const ( - tabForward tabDirection = iota - tabReverse -) - -func (s *State) refresh(prompt []rune, buf []rune, pos int) error { - if s.multiLineMode { - return s.refreshMultiLine(prompt, buf, pos) - } else { - return s.refreshSingleLine(prompt, buf, pos) - } -} - -func (s *State) refreshSingleLine(prompt []rune, buf []rune, pos int) error { - s.cursorPos(0) - _, err := fmt.Print(string(prompt)) - if err != nil { - return err - } - - pLen := countGlyphs(prompt) - bLen := countGlyphs(buf) - pos = countGlyphs(buf[:pos]) - if pLen+bLen < s.columns { - _, err = fmt.Print(string(buf)) - s.eraseLine() - s.cursorPos(pLen + pos) - } else { - // Find space available - space := s.columns - pLen - space-- // space for cursor - start := pos - space/2 - end := start + space - if end > bLen { - end = bLen - start = end - space - } - if start < 0 { - start = 0 - end = space - } - pos -= start - - // Leave space for markers - if start > 0 { - start++ - } - if end < bLen { - end-- - } - startRune := len(getPrefixGlyphs(buf, start)) - line := getPrefixGlyphs(buf[startRune:], end-start) - - // Output - if start > 0 { - fmt.Print("{") - } - fmt.Print(string(line)) - if end < bLen { - fmt.Print("}") - } - - // Set cursor position - s.eraseLine() - s.cursorPos(pLen + pos) - } - return err -} - -func (s *State) refreshMultiLine(prompt []rune, buf []rune, pos int) error { - promptColumns := countMultiLineGlyphs(prompt, s.columns, 0) - totalColumns := countMultiLineGlyphs(buf, s.columns, promptColumns) - totalRows := (totalColumns + s.columns - 1) / s.columns - maxRows := s.maxRows - if totalRows > s.maxRows { - s.maxRows = totalRows - } - cursorRows := s.cursorRows - if cursorRows == 0 { - cursorRows = 1 - } - - /* First step: clear all the lines used before. To do so start by - * going to the last row. */ - if maxRows-cursorRows > 0 { - s.moveDown(maxRows - cursorRows) - } - - /* Now for every row clear it, go up. */ - for i := 0; i < maxRows-1; i++ { - s.cursorPos(0) - s.eraseLine() - s.moveUp(1) - } - - /* Clean the top line. */ - s.cursorPos(0) - s.eraseLine() - - /* Write the prompt and the current buffer content */ - if _, err := fmt.Print(string(prompt)); err != nil { - return err - } - if _, err := fmt.Print(string(buf)); err != nil { - return err - } - - /* If we are at the very end of the screen with our prompt, we need to - * emit a newline and move the prompt to the first column. */ - cursorColumns := countMultiLineGlyphs(buf[:pos], s.columns, promptColumns) - if cursorColumns == totalColumns && totalColumns%s.columns == 0 { - s.emitNewLine() - s.cursorPos(0) - totalRows++ - if totalRows > s.maxRows { - s.maxRows = totalRows - } - } - - /* Move cursor to right position. */ - cursorRows = (cursorColumns + s.columns) / s.columns - if s.cursorRows > 0 && totalRows-cursorRows > 0 { - s.moveUp(totalRows - cursorRows) - } - /* Set column. */ - s.cursorPos(cursorColumns % s.columns) - - s.cursorRows = cursorRows - return nil -} - -func (s *State) resetMultiLine(prompt []rune, buf []rune, pos int) { - columns := countMultiLineGlyphs(prompt, s.columns, 0) - columns = countMultiLineGlyphs(buf[:pos], s.columns, columns) - columns += 2 // ^C - cursorRows := (columns + s.columns) / s.columns - if s.maxRows-cursorRows > 0 { - for i := 0; i < s.maxRows-cursorRows; i++ { - fmt.Println() // always moves the cursor down or scrolls the window up as needed - } - } - s.maxRows = 1 - s.cursorRows = 0 -} - -func longestCommonPrefix(strs []string) string { - if len(strs) == 0 { - return "" - } - longest := strs[0] - - for _, str := range strs[1:] { - for !strings.HasPrefix(str, longest) { - longest = longest[:len(longest)-1] - } - } - // Remove trailing partial runes - longest = strings.TrimRight(longest, "\uFFFD") - return longest -} - -func (s *State) circularTabs(items []string) func(tabDirection) (string, error) { - item := -1 - return func(direction tabDirection) (string, error) { - if direction == tabForward { - if item < len(items)-1 { - item++ - } else { - item = 0 - } - } else if direction == tabReverse { - if item > 0 { - item-- - } else { - item = len(items) - 1 - } - } - return items[item], nil - } -} - -func calculateColumns(screenWidth int, items []string) (numColumns, numRows, maxWidth int) { - for _, item := range items { - if len(item) >= screenWidth { - return 1, len(items), screenWidth - 1 - } - if len(item) >= maxWidth { - maxWidth = len(item) + 1 - } - } - - numColumns = screenWidth / maxWidth - numRows = len(items) / numColumns - if len(items)%numColumns > 0 { - numRows++ - } - - if len(items) <= numColumns { - maxWidth = 0 - } - - return -} - -func (s *State) printedTabs(items []string) func(tabDirection) (string, error) { - numTabs := 1 - prefix := longestCommonPrefix(items) - return func(direction tabDirection) (string, error) { - if len(items) == 1 { - return items[0], nil - } - - if numTabs == 2 { - if len(items) > 100 { - fmt.Printf("\nDisplay all %d possibilities? (y or n) ", len(items)) - prompt: - for { - next, err := s.readNext() - if err != nil { - return prefix, err - } - - if key, ok := next.(rune); ok { - switch key { - case 'n', 'N': - return prefix, nil - case 'y', 'Y': - break prompt - case ctrlC, ctrlD, cr, lf: - s.restartPrompt() - } - } - } - } - fmt.Println("") - - numColumns, numRows, maxWidth := calculateColumns(s.columns, items) - - for i := 0; i < numRows; i++ { - for j := 0; j < numColumns*numRows; j += numRows { - if i+j < len(items) { - if maxWidth > 0 { - fmt.Printf("%-*.[1]*s", maxWidth, items[i+j]) - } else { - fmt.Printf("%v ", items[i+j]) - } - } - } - fmt.Println("") - } - } else { - numTabs++ - } - return prefix, nil - } -} - -func (s *State) tabComplete(p []rune, line []rune, pos int) ([]rune, int, interface{}, error) { - if s.completer == nil { - return line, pos, rune(esc), nil - } - head, list, tail := s.completer(string(line), pos) - if len(list) <= 0 { - return line, pos, rune(esc), nil - } - hl := utf8.RuneCountInString(head) - if len(list) == 1 { - s.refresh(p, []rune(head+list[0]+tail), hl+utf8.RuneCountInString(list[0])) - return []rune(head + list[0] + tail), hl + utf8.RuneCountInString(list[0]), rune(esc), nil - } - - direction := tabForward - tabPrinter := s.circularTabs(list) - if s.tabStyle == TabPrints { - tabPrinter = s.printedTabs(list) - } - - for { - pick, err := tabPrinter(direction) - if err != nil { - return line, pos, rune(esc), err - } - s.refresh(p, []rune(head+pick+tail), hl+utf8.RuneCountInString(pick)) - - next, err := s.readNext() - if err != nil { - return line, pos, rune(esc), err - } - if key, ok := next.(rune); ok { - if key == tab { - direction = tabForward - continue - } - if key == esc { - return line, pos, rune(esc), nil - } - } - if a, ok := next.(action); ok && a == shiftTab { - direction = tabReverse - continue - } - return []rune(head + pick + tail), hl + utf8.RuneCountInString(pick), next, nil - } - // Not reached - return line, pos, rune(esc), nil -} - -// reverse intelligent search, implements a bash-like history search. -func (s *State) reverseISearch(origLine []rune, origPos int) ([]rune, int, interface{}, error) { - p := "(reverse-i-search)`': " - s.refresh([]rune(p), origLine, origPos) - - line := []rune{} - pos := 0 - foundLine := string(origLine) - foundPos := origPos - - getLine := func() ([]rune, []rune, int) { - search := string(line) - prompt := "(reverse-i-search)`%s': " - return []rune(fmt.Sprintf(prompt, search)), []rune(foundLine), foundPos - } - - history, positions := s.getHistoryByPattern(string(line)) - historyPos := len(history) - 1 - - for { - next, err := s.readNext() - if err != nil { - return []rune(foundLine), foundPos, rune(esc), err - } - - switch v := next.(type) { - case rune: - switch v { - case ctrlR: // Search backwards - if historyPos > 0 && historyPos < len(history) { - historyPos-- - foundLine = history[historyPos] - foundPos = positions[historyPos] - } else { - fmt.Print(beep) - } - case ctrlS: // Search forward - if historyPos < len(history)-1 && historyPos >= 0 { - historyPos++ - foundLine = history[historyPos] - foundPos = positions[historyPos] - } else { - fmt.Print(beep) - } - case ctrlH, bs: // Backspace - if pos <= 0 { - fmt.Print(beep) - } else { - n := len(getSuffixGlyphs(line[:pos], 1)) - line = append(line[:pos-n], line[pos:]...) - pos -= n - - // For each char deleted, display the last matching line of history - history, positions := s.getHistoryByPattern(string(line)) - historyPos = len(history) - 1 - if len(history) > 0 { - foundLine = history[historyPos] - foundPos = positions[historyPos] - } else { - foundLine = "" - foundPos = 0 - } - } - case ctrlG: // Cancel - return origLine, origPos, rune(esc), err - - case tab, cr, lf, ctrlA, ctrlB, ctrlD, ctrlE, ctrlF, ctrlK, - ctrlL, ctrlN, ctrlO, ctrlP, ctrlQ, ctrlT, ctrlU, ctrlV, ctrlW, ctrlX, ctrlY, ctrlZ: - fallthrough - case 0, ctrlC, esc, 28, 29, 30, 31: - return []rune(foundLine), foundPos, next, err - default: - line = append(line[:pos], append([]rune{v}, line[pos:]...)...) - pos++ - - // For each keystroke typed, display the last matching line of history - history, positions = s.getHistoryByPattern(string(line)) - historyPos = len(history) - 1 - if len(history) > 0 { - foundLine = history[historyPos] - foundPos = positions[historyPos] - } else { - foundLine = "" - foundPos = 0 - } - } - case action: - return []rune(foundLine), foundPos, next, err - } - s.refresh(getLine()) - } -} - -// addToKillRing adds some text to the kill ring. If mode is 0 it adds it to a -// new node in the end of the kill ring, and move the current pointer to the new -// node. If mode is 1 or 2 it appends or prepends the text to the current entry -// of the killRing. -func (s *State) addToKillRing(text []rune, mode int) { - // Don't use the same underlying array as text - killLine := make([]rune, len(text)) - copy(killLine, text) - - // Point killRing to a newNode, procedure depends on the killring state and - // append mode. - if mode == 0 { // Add new node to killRing - if s.killRing == nil { // if killring is empty, create a new one - s.killRing = ring.New(1) - } else if s.killRing.Len() >= KillRingMax { // if killring is "full" - s.killRing = s.killRing.Next() - } else { // Normal case - s.killRing.Link(ring.New(1)) - s.killRing = s.killRing.Next() - } - } else { - if s.killRing == nil { // if killring is empty, create a new one - s.killRing = ring.New(1) - s.killRing.Value = []rune{} - } - if mode == 1 { // Append to last entry - killLine = append(s.killRing.Value.([]rune), killLine...) - } else if mode == 2 { // Prepend to last entry - killLine = append(killLine, s.killRing.Value.([]rune)...) - } - } - - // Save text in the current killring node - s.killRing.Value = killLine -} - -func (s *State) yank(p []rune, text []rune, pos int) ([]rune, int, interface{}, error) { - if s.killRing == nil { - return text, pos, rune(esc), nil - } - - lineStart := text[:pos] - lineEnd := text[pos:] - var line []rune - - for { - value := s.killRing.Value.([]rune) - line = make([]rune, 0) - line = append(line, lineStart...) - line = append(line, value...) - line = append(line, lineEnd...) - - pos = len(lineStart) + len(value) - s.refresh(p, line, pos) - - next, err := s.readNext() - if err != nil { - return line, pos, next, err - } - - switch v := next.(type) { - case rune: - return line, pos, next, nil - case action: - switch v { - case altY: - s.killRing = s.killRing.Prev() - default: - return line, pos, next, nil - } - } - } - - return line, pos, esc, nil -} - -// Prompt displays p and returns a line of user input, not including a trailing -// newline character. An io.EOF error is returned if the user signals end-of-file -// by pressing Ctrl-D. Prompt allows line editing if the terminal supports it. -func (s *State) Prompt(prompt string) (string, error) { - if s.inputRedirected || !s.terminalSupported { - return s.promptUnsupported(prompt) - } - if s.outputRedirected { - return "", ErrNotTerminalOutput - } - - s.historyMutex.RLock() - defer s.historyMutex.RUnlock() - - fmt.Print(prompt) - p := []rune(prompt) - var line []rune - pos := 0 - historyEnd := "" - prefixHistory := s.getHistoryByPrefix(string(line)) - historyPos := len(prefixHistory) - historyAction := false // used to mark history related actions - killAction := 0 // used to mark kill related actions - - defer s.stopPrompt() - -restart: - s.startPrompt() - s.getColumns() - -mainLoop: - for { - next, err := s.readNext() - haveNext: - if err != nil { - if s.shouldRestart != nil && s.shouldRestart(err) { - goto restart - } - return "", err - } - - historyAction = false - switch v := next.(type) { - case rune: - switch v { - case cr, lf: - if s.multiLineMode { - s.resetMultiLine(p, line, pos) - } - fmt.Println() - break mainLoop - case ctrlA: // Start of line - pos = 0 - s.refresh(p, line, pos) - case ctrlE: // End of line - pos = len(line) - s.refresh(p, line, pos) - case ctrlB: // left - if pos > 0 { - pos -= len(getSuffixGlyphs(line[:pos], 1)) - s.refresh(p, line, pos) - } else { - fmt.Print(beep) - } - case ctrlF: // right - if pos < len(line) { - pos += len(getPrefixGlyphs(line[pos:], 1)) - s.refresh(p, line, pos) - } else { - fmt.Print(beep) - } - case ctrlD: // del - if pos == 0 && len(line) == 0 { - // exit - return "", io.EOF - } - - // ctrlD is a potential EOF, so the rune reader shuts down. - // Therefore, if it isn't actually an EOF, we must re-startPrompt. - s.restartPrompt() - - if pos >= len(line) { - fmt.Print(beep) - } else { - n := len(getPrefixGlyphs(line[pos:], 1)) - line = append(line[:pos], line[pos+n:]...) - s.refresh(p, line, pos) - } - case ctrlK: // delete remainder of line - if pos >= len(line) { - fmt.Print(beep) - } else { - if killAction > 0 { - s.addToKillRing(line[pos:], 1) // Add in apend mode - } else { - s.addToKillRing(line[pos:], 0) // Add in normal mode - } - - killAction = 2 // Mark that there was a kill action - line = line[:pos] - s.refresh(p, line, pos) - } - case ctrlP: // up - historyAction = true - if historyPos > 0 { - if historyPos == len(prefixHistory) { - historyEnd = string(line) - } - historyPos-- - line = []rune(prefixHistory[historyPos]) - pos = len(line) - s.refresh(p, line, pos) - } else { - fmt.Print(beep) - } - case ctrlN: // down - historyAction = true - if historyPos < len(prefixHistory) { - historyPos++ - if historyPos == len(prefixHistory) { - line = []rune(historyEnd) - } else { - line = []rune(prefixHistory[historyPos]) - } - pos = len(line) - s.refresh(p, line, pos) - } else { - fmt.Print(beep) - } - case ctrlT: // transpose prev glyph with glyph under cursor - if len(line) < 2 || pos < 1 { - fmt.Print(beep) - } else { - if pos == len(line) { - pos -= len(getSuffixGlyphs(line, 1)) - } - prev := getSuffixGlyphs(line[:pos], 1) - next := getPrefixGlyphs(line[pos:], 1) - scratch := make([]rune, len(prev)) - copy(scratch, prev) - copy(line[pos-len(prev):], next) - copy(line[pos-len(prev)+len(next):], scratch) - pos += len(next) - s.refresh(p, line, pos) - } - case ctrlL: // clear screen - s.eraseScreen() - s.refresh(p, line, pos) - case ctrlC: // reset - fmt.Println("^C") - if s.multiLineMode { - s.resetMultiLine(p, line, pos) - } - if s.ctrlCAborts { - return "", ErrPromptAborted - } - line = line[:0] - pos = 0 - fmt.Print(prompt) - s.restartPrompt() - case ctrlH, bs: // Backspace - if pos <= 0 { - fmt.Print(beep) - } else { - n := len(getSuffixGlyphs(line[:pos], 1)) - line = append(line[:pos-n], line[pos:]...) - pos -= n - s.refresh(p, line, pos) - } - case ctrlU: // Erase line before cursor - if killAction > 0 { - s.addToKillRing(line[:pos], 2) // Add in prepend mode - } else { - s.addToKillRing(line[:pos], 0) // Add in normal mode - } - - killAction = 2 // Mark that there was some killing - line = line[pos:] - pos = 0 - s.refresh(p, line, pos) - case ctrlW: // Erase word - if pos == 0 { - fmt.Print(beep) - break - } - // Remove whitespace to the left - var buf []rune // Store the deleted chars in a buffer - for { - if pos == 0 || !unicode.IsSpace(line[pos-1]) { - break - } - buf = append(buf, line[pos-1]) - line = append(line[:pos-1], line[pos:]...) - pos-- - } - // Remove non-whitespace to the left - for { - if pos == 0 || unicode.IsSpace(line[pos-1]) { - break - } - buf = append(buf, line[pos-1]) - line = append(line[:pos-1], line[pos:]...) - pos-- - } - // Invert the buffer and save the result on the killRing - var newBuf []rune - for i := len(buf) - 1; i >= 0; i-- { - newBuf = append(newBuf, buf[i]) - } - if killAction > 0 { - s.addToKillRing(newBuf, 2) // Add in prepend mode - } else { - s.addToKillRing(newBuf, 0) // Add in normal mode - } - killAction = 2 // Mark that there was some killing - - s.refresh(p, line, pos) - case ctrlY: // Paste from Yank buffer - line, pos, next, err = s.yank(p, line, pos) - goto haveNext - case ctrlR: // Reverse Search - line, pos, next, err = s.reverseISearch(line, pos) - s.refresh(p, line, pos) - goto haveNext - case tab: // Tab completion - line, pos, next, err = s.tabComplete(p, line, pos) - goto haveNext - // Catch keys that do nothing, but you don't want them to beep - case esc: - // DO NOTHING - // Unused keys - case ctrlG, ctrlO, ctrlQ, ctrlS, ctrlV, ctrlX, ctrlZ: - fallthrough - // Catch unhandled control codes (anything <= 31) - case 0, 28, 29, 30, 31: - fmt.Print(beep) - default: - if pos == len(line) && !s.multiLineMode && countGlyphs(p)+countGlyphs(line) < s.columns-1 { - line = append(line, v) - fmt.Printf("%c", v) - pos++ - } else { - line = append(line[:pos], append([]rune{v}, line[pos:]...)...) - pos++ - s.refresh(p, line, pos) - } - } - case action: - switch v { - case del: - if pos >= len(line) { - fmt.Print(beep) - } else { - n := len(getPrefixGlyphs(line[pos:], 1)) - line = append(line[:pos], line[pos+n:]...) - } - case left: - if pos > 0 { - pos -= len(getSuffixGlyphs(line[:pos], 1)) - } else { - fmt.Print(beep) - } - case wordLeft, altB: - if pos > 0 { - var spaceHere, spaceLeft, leftKnown bool - for { - pos-- - if pos == 0 { - break - } - if leftKnown { - spaceHere = spaceLeft - } else { - spaceHere = unicode.IsSpace(line[pos]) - } - spaceLeft, leftKnown = unicode.IsSpace(line[pos-1]), true - if !spaceHere && spaceLeft { - break - } - } - } else { - fmt.Print(beep) - } - case right: - if pos < len(line) { - pos += len(getPrefixGlyphs(line[pos:], 1)) - } else { - fmt.Print(beep) - } - case wordRight, altF: - if pos < len(line) { - var spaceHere, spaceLeft, hereKnown bool - for { - pos++ - if pos == len(line) { - break - } - if hereKnown { - spaceLeft = spaceHere - } else { - spaceLeft = unicode.IsSpace(line[pos-1]) - } - spaceHere, hereKnown = unicode.IsSpace(line[pos]), true - if spaceHere && !spaceLeft { - break - } - } - } else { - fmt.Print(beep) - } - case up: - historyAction = true - if historyPos > 0 { - if historyPos == len(prefixHistory) { - historyEnd = string(line) - } - historyPos-- - line = []rune(prefixHistory[historyPos]) - pos = len(line) - } else { - fmt.Print(beep) - } - case down: - historyAction = true - if historyPos < len(prefixHistory) { - historyPos++ - if historyPos == len(prefixHistory) { - line = []rune(historyEnd) - } else { - line = []rune(prefixHistory[historyPos]) - } - pos = len(line) - } else { - fmt.Print(beep) - } - case home: // Start of line - pos = 0 - case end: // End of line - pos = len(line) - case winch: // Window change - if s.multiLineMode { - if s.maxRows-s.cursorRows > 0 { - s.moveDown(s.maxRows - s.cursorRows) - } - for i := 0; i < s.maxRows-1; i++ { - s.cursorPos(0) - s.eraseLine() - s.moveUp(1) - } - s.maxRows = 1 - s.cursorRows = 1 - } - } - s.refresh(p, line, pos) - } - if !historyAction { - prefixHistory = s.getHistoryByPrefix(string(line)) - historyPos = len(prefixHistory) - } - if killAction > 0 { - killAction-- - } - } - return string(line), nil -} - -// PasswordPrompt displays p, and then waits for user input. The input typed by -// the user is not displayed in the terminal. -func (s *State) PasswordPrompt(prompt string) (string, error) { - if !s.terminalSupported { - return "", errors.New("liner: function not supported in this terminal") - } - if s.inputRedirected { - return s.promptUnsupported(prompt) - } - if s.outputRedirected { - return "", ErrNotTerminalOutput - } - - defer s.stopPrompt() - -restart: - s.startPrompt() - s.getColumns() - - fmt.Print(prompt) - p := []rune(prompt) - var line []rune - pos := 0 - -mainLoop: - for { - next, err := s.readNext() - if err != nil { - if s.shouldRestart != nil && s.shouldRestart(err) { - goto restart - } - return "", err - } - - switch v := next.(type) { - case rune: - switch v { - case cr, lf: - if s.multiLineMode { - s.resetMultiLine(p, line, pos) - } - fmt.Println() - break mainLoop - case ctrlD: // del - if pos == 0 && len(line) == 0 { - // exit - return "", io.EOF - } - - // ctrlD is a potential EOF, so the rune reader shuts down. - // Therefore, if it isn't actually an EOF, we must re-startPrompt. - s.restartPrompt() - case ctrlL: // clear screen - s.eraseScreen() - s.refresh(p, []rune{}, 0) - case ctrlH, bs: // Backspace - if pos <= 0 { - fmt.Print(beep) - } else { - n := len(getSuffixGlyphs(line[:pos], 1)) - line = append(line[:pos-n], line[pos:]...) - pos -= n - } - case ctrlC: - fmt.Println("^C") - if s.multiLineMode { - s.resetMultiLine(p, line, pos) - } - if s.ctrlCAborts { - return "", ErrPromptAborted - } - line = line[:0] - pos = 0 - fmt.Print(prompt) - s.restartPrompt() - // Unused keys - case esc, tab, ctrlA, ctrlB, ctrlE, ctrlF, ctrlG, ctrlK, ctrlN, ctrlO, ctrlP, ctrlQ, ctrlR, ctrlS, - ctrlT, ctrlU, ctrlV, ctrlW, ctrlX, ctrlY, ctrlZ: - fallthrough - // Catch unhandled control codes (anything <= 31) - case 0, 28, 29, 30, 31: - fmt.Print(beep) - default: - line = append(line[:pos], append([]rune{v}, line[pos:]...)...) - pos++ - } - } - } - return string(line), nil -} |