mirror of https://github.com/chzyer/readline.git
387 lines
8.8 KiB
Go
387 lines
8.8 KiB
Go
package readline
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import (
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"bufio"
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"bytes"
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"fmt"
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"io"
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)
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type AutoCompleter interface {
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// Readline will pass the whole line and current offset to it
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// Completer need to pass all the candidates, and how long they shared the same characters in line
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// Example:
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// [go, git, git-shell, grep]
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// Do("g", 1) => ["o", "it", "it-shell", "rep"], 1
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// Do("gi", 2) => ["t", "t-shell"], 2
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// Do("git", 3) => ["", "-shell"], 3
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Do(line []rune, pos int) (newLine [][]rune, length int)
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}
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type TabCompleter struct{}
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func (t *TabCompleter) Do([]rune, int) ([][]rune, int) {
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return [][]rune{[]rune("\t")}, 0
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}
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type opCompleter struct {
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w io.Writer
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op *Operation
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width int
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inCompleteMode bool
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inSelectMode bool
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candidate [][]rune
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candidateSource []rune
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candidateOff int
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candidateChoise int
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candidateColNum int
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// State for pagination
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maxLine int // Maximum allowed columns on a single terminal
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pageIdx int // Current page
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}
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func newOpCompleter(w io.Writer, op *Operation, width int) *opCompleter {
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return &opCompleter{
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w: w,
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op: op,
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width: width,
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maxLine: 5,
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}
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}
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func (o *opCompleter) doSelect() {
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if len(o.candidate) == 1 {
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o.op.buf.WriteRunes(o.candidate[0])
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o.ExitCompleteMode(false)
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return
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}
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o.nextCandidate(1)
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o.CompleteRefresh()
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}
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func (o *opCompleter) nextCandidate(i int) {
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// Number of elements in a full screen
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numCandidatePerPage := o.candidateColNum * o.maxLine
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// Number of elements in the current screen, which could be non-full
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matrixSize := o.numCandidatesCurPage()
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pageStart := o.pageIdx * numCandidatePerPage
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candidateChoiceModPage := o.candidateChoise - pageStart
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candidateChoiceModPage += i
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candidateChoiceModPage %= matrixSize
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if candidateChoiceModPage < 0 {
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candidateChoiceModPage += matrixSize
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}
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o.candidateChoise = candidateChoiceModPage + pageStart
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}
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func (o *opCompleter) nextLine(i int) {
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// Number of elements in a full screen
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candidatesCurPage := o.numCandidatesCurPage()
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numCandidatesFullPage := o.maxLine * o.candidateColNum
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pageStart := o.pageIdx * numCandidatesFullPage
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// Number of elements in the current screen, which could be non-full
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numLines := o.getLinesCurPage()
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rectangleSize := numLines * o.candidateColNum
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candidateChoiceModPage := o.candidateChoise - pageStart
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candidateChoiceModPage += i * o.candidateColNum
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if candidateChoiceModPage >= candidatesCurPage {
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if candidateChoiceModPage < rectangleSize {
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candidateChoiceModPage += o.candidateColNum
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}
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candidateChoiceModPage -= rectangleSize
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} else if candidateChoiceModPage < 0 {
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candidateChoiceModPage += rectangleSize
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if candidateChoiceModPage > candidatesCurPage {
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candidateChoiceModPage -= o.candidateColNum
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}
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}
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o.candidateChoise = candidateChoiceModPage + pageStart
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}
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func (o *opCompleter) OnComplete() bool {
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if o.width == 0 {
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return false
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}
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if o.IsInCompleteSelectMode() {
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o.doSelect()
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return true
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}
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buf := o.op.buf
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rs := buf.Runes()
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if o.IsInCompleteMode() && o.candidateSource != nil && runes.Equal(rs, o.candidateSource) {
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o.EnterCompleteSelectMode()
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o.doSelect()
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return true
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}
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o.ExitCompleteSelectMode()
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o.candidateSource = rs
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newLines, offset := o.op.cfg.AutoComplete.Do(rs, buf.idx)
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if len(newLines) == 0 {
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o.ExitCompleteMode(false)
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return true
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}
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// only Aggregate candidates in non-complete mode
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if !o.IsInCompleteMode() {
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if len(newLines) == 1 {
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buf.WriteRunes(newLines[0])
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o.ExitCompleteMode(false)
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return true
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}
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same, size := runes.Aggregate(newLines)
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if size > 0 {
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buf.WriteRunes(same)
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o.ExitCompleteMode(false)
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return true
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}
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}
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o.EnterCompleteMode(offset, newLines)
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return true
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}
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func (o *opCompleter) IsInCompleteSelectMode() bool {
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return o.inSelectMode
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}
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func (o *opCompleter) IsInCompleteMode() bool {
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return o.inCompleteMode
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}
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func (o *opCompleter) HandleCompleteSelect(r rune) bool {
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next := true
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switch r {
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case CharEnter, CharCtrlJ:
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next = false
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o.op.buf.WriteRunes(o.op.candidate[o.op.candidateChoise])
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o.ExitCompleteMode(false)
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case CharLineStart:
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num := o.candidateChoise % o.candidateColNum
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o.nextCandidate(-num)
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case CharLineEnd:
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num := o.candidateColNum - o.candidateChoise%o.candidateColNum - 1
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o.candidateChoise += num
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if o.candidateChoise >= len(o.candidate) {
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o.candidateChoise = len(o.candidate) - 1
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}
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case CharBackspace:
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o.ExitCompleteSelectMode()
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next = false
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case CharTab, CharForward:
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o.doSelect()
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case CharBell, CharInterrupt:
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o.ExitCompleteMode(true)
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next = false
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case CharNext:
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o.nextLine(1)
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case CharBackward:
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o.nextCandidate(-1)
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case CharPrev:
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o.nextLine(-1)
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case CharK:
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o.updatePage(1)
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case CharJ:
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o.updatePage(-1)
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default:
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next = false
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o.ExitCompleteSelectMode()
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}
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if next {
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o.CompleteRefresh()
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return true
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}
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return false
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}
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// Number of candidate completions we can show on the current page,
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// which might be different from number of candidates on a full page if
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// we are on the last page.
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func (o *opCompleter) numCandidatesCurPage() int {
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numCandidatePerPage := o.candidateColNum * o.maxLine
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pageStart := o.pageIdx * numCandidatePerPage
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if len(o.candidate)-pageStart >= numCandidatePerPage {
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return numCandidatePerPage
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}
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return len(o.candidate) - pageStart
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}
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// Number of lines on the current page
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func (o *opCompleter) getLinesCurPage() int {
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curPageSize := o.numCandidatesCurPage()
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numLines := curPageSize / o.candidateColNum
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if curPageSize%o.candidateColNum != 0 {
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numLines += 1
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}
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return numLines
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}
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func (o *opCompleter) OnWidthChange(newWidth int) {
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o.width = newWidth
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}
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// Move page
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func (o *opCompleter) updatePage(offset int) {
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if !o.inCompleteMode {
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return
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}
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nextPageIdx := o.pageIdx + offset
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if nextPageIdx < 0 {
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return
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}
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nextPageStart := nextPageIdx * o.candidateColNum * o.maxLine
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if nextPageStart > len(o.candidate) {
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return
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}
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o.pageIdx = nextPageIdx
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o.candidateChoise = nextPageStart
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}
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func (o *opCompleter) CompleteRefresh() {
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if !o.inCompleteMode {
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return
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}
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lineCnt := o.op.buf.CursorLineCount()
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colWidth := 0
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for _, c := range o.candidate {
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w := runes.WidthAll(c)
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if w > colWidth {
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colWidth = w
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}
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}
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colWidth += o.candidateOff + 1
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same := o.op.buf.RuneSlice(-o.candidateOff)
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// -1 to avoid reach the end of line
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width := o.width - 1
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colNum := width / colWidth
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if colNum != 0 {
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colWidth += (width - (colWidth * colNum)) / colNum
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}
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o.candidateColNum = colNum
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buf := bufio.NewWriter(o.w)
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buf.Write(bytes.Repeat([]byte("\n"), lineCnt))
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colIdx := 0
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lines := 1
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buf.WriteString("\033[J")
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// Compute the candidates to show on the current page
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numCandidatePerPage := o.candidateColNum * o.maxLine
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startIdx := o.pageIdx * numCandidatePerPage
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endIdx := (o.pageIdx + 1) * numCandidatePerPage
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if endIdx > len(o.candidate) {
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endIdx = len(o.candidate)
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}
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for idx := startIdx; idx < endIdx; idx += 1 {
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c := o.candidate[idx]
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inSelect := idx == o.candidateChoise && o.IsInCompleteSelectMode()
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if inSelect {
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buf.WriteString("\033[30;47m")
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}
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buf.WriteString(string(same))
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buf.WriteString(string(c))
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buf.Write(bytes.Repeat([]byte(" "), colWidth-runes.WidthAll(c)-runes.WidthAll(same)))
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if inSelect {
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buf.WriteString("\033[0m")
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}
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colIdx++
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if colIdx == colNum {
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buf.WriteString("\n")
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lines++
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colIdx = 0
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}
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}
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// Add an extra line for navigation instructions
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if colIdx != 0 {
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buf.WriteString("\n")
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lines++
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}
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navigationMsg := "(j: prev page) (k: next page)"
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buf.WriteString(navigationMsg)
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buf.Write(bytes.Repeat([]byte(" "), width-len(navigationMsg)))
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// move back
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fmt.Fprintf(buf, "\033[%dA\r", lineCnt-1+lines)
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fmt.Fprintf(buf, "\033[%dC", o.op.buf.idx+o.op.buf.PromptLen())
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buf.Flush()
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}
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func (o *opCompleter) aggCandidate(candidate [][]rune) int {
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offset := 0
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for i := 0; i < len(candidate[0]); i++ {
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for j := 0; j < len(candidate)-1; j++ {
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if i > len(candidate[j]) {
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goto aggregate
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}
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if candidate[j][i] != candidate[j+1][i] {
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goto aggregate
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}
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}
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offset = i
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}
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aggregate:
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return offset
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}
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func (o *opCompleter) EnterCompleteSelectMode() {
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o.inSelectMode = true
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o.candidateChoise = -1
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o.CompleteRefresh()
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}
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func (o *opCompleter) EnterCompleteMode(offset int, candidate [][]rune) {
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o.inCompleteMode = true
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o.candidate = candidate
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o.candidateOff = offset
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// Initialize for complete mode
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colWidth := 0
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for _, c := range candidate {
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w := runes.WidthAll(c)
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if w > colWidth {
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colWidth = w
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}
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}
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colWidth += offset + 1
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width := o.width - 1
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colNum := width / colWidth
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if colNum != 0 {
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colWidth += (width - (colWidth * colNum)) / colNum
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}
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o.candidateColNum = colNum
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o.pageIdx = 0
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o.CompleteRefresh()
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}
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func (o *opCompleter) ExitCompleteSelectMode() {
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o.inSelectMode = false
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o.candidate = nil
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o.candidateChoise = -1
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o.candidateOff = -1
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o.candidateSource = nil
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}
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func (o *opCompleter) ExitCompleteMode(revent bool) {
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o.inCompleteMode = false
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o.ExitCompleteSelectMode()
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}
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