mirror of https://github.com/chzyer/readline.git
152 lines
2.9 KiB
Go
152 lines
2.9 KiB
Go
package readline
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import (
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"bytes"
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"container/list"
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"fmt"
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"io"
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)
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const (
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S_STATE_FOUND = iota
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S_STATE_FAILING
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)
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const (
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S_DIR_BCK = iota
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S_DIR_FWD
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)
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type opSearch struct {
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inMode bool
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state int
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dir int
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source *list.Element
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w io.Writer
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buf *RuneBuffer
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data []rune
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history *opHistory
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markStart int
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markEnd int
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}
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func newOpSearch(w io.Writer, buf *RuneBuffer, history *opHistory) *opSearch {
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return &opSearch{
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w: w,
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buf: buf,
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history: history,
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}
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}
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func (o *opSearch) IsSearchMode() bool {
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return o.inMode
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}
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func (o *opSearch) SearchBackspace() {
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if len(o.data) > 0 {
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o.data = o.data[:len(o.data)-1]
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o.search(true)
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}
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}
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func (o *opSearch) findHistoryBy(isNewSearch bool) (int, *list.Element) {
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if o.dir == S_DIR_BCK {
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return o.history.FindHistoryBck(isNewSearch, o.data, o.buf.idx)
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}
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return o.history.FindHistoryFwd(isNewSearch, o.data, o.buf.idx)
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}
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func (o *opSearch) search(isChange bool) bool {
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if len(o.data) == 0 {
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o.state = S_STATE_FOUND
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o.SearchRefresh(-1)
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return true
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}
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idx, elem := o.findHistoryBy(isChange)
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if elem == nil {
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o.SearchRefresh(-2)
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return false
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}
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o.history.current = elem
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item := o.history.showItem(o.history.current.Value)
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start, end := 0, 0
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if o.dir == S_DIR_BCK {
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start, end = idx, idx+len(o.data)
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} else {
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start, end = idx, idx+len(o.data)
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idx += len(o.data)
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}
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o.buf.SetWithIdx(idx, item)
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o.markStart, o.markEnd = start, end
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o.SearchRefresh(idx)
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return true
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}
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func (o *opSearch) SearchChar(r rune) {
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o.data = append(o.data, r)
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o.search(true)
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}
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func (o *opSearch) SearchMode(dir int) {
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alreadyInMode := o.inMode
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o.inMode = true
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o.dir = dir
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o.source = o.history.current
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if alreadyInMode {
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o.search(false)
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} else {
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o.SearchRefresh(-1)
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}
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}
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func (o *opSearch) ExitSearchMode(revert bool) {
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if revert {
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o.history.current = o.source
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o.buf.Set(o.history.showItem(o.history.current.Value))
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}
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o.markStart, o.markEnd = 0, 0
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o.state = S_STATE_FOUND
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o.inMode = false
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o.source = nil
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o.data = nil
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}
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func (o *opSearch) SearchRefresh(x int) {
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if x == -2 {
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o.state = S_STATE_FAILING
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} else if x >= 0 {
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o.state = S_STATE_FOUND
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}
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if x < 0 {
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x = o.buf.idx
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}
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x += o.buf.PromptLen()
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x = x % getWidth()
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if o.markStart > 0 {
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o.buf.SetStyle(o.markStart, o.markEnd, "4m")
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}
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lineCnt := o.buf.CursorLineCount()
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buf := bytes.NewBuffer(nil)
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buf.Write(bytes.Repeat([]byte("\n"), lineCnt))
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buf.WriteString("\033[J")
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if o.state == S_STATE_FAILING {
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buf.WriteString("failing ")
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}
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if o.dir == S_DIR_BCK {
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buf.WriteString("bck")
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} else if o.dir == S_DIR_FWD {
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buf.WriteString("fwd")
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}
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buf.WriteString("-i-search: ")
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buf.WriteString(string(o.data)) // keyword
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buf.WriteString("\033[4m \033[0m") // _
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fmt.Fprintf(buf, "\r\033[%dA", lineCnt) // move prev
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if x > 0 {
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fmt.Fprintf(buf, "\033[%dC", x) // move forward
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}
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o.w.Write(buf.Bytes())
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}
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