Add vendor dependencies as part git repo
This commit is contained in:
Sam Stoelinga
330
vendor/github.com/chzyer/readline/history.go
generated
vendored
Normal file
330
vendor/github.com/chzyer/readline/history.go
generated
vendored
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@ -0,0 +1,330 @@
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package readline
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import (
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"bufio"
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"container/list"
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"fmt"
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"os"
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"strings"
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"sync"
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)
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type hisItem struct {
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Source []rune
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Version int64
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Tmp []rune
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}
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func (h *hisItem) Clean() {
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h.Source = nil
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h.Tmp = nil
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}
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type opHistory struct {
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cfg *Config
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history *list.List
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historyVer int64
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current *list.Element
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fd *os.File
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fdLock sync.Mutex
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enable bool
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}
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func newOpHistory(cfg *Config) (o *opHistory) {
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o = &opHistory{
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cfg: cfg,
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history: list.New(),
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enable: true,
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}
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return o
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}
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func (o *opHistory) Reset() {
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o.history = list.New()
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o.current = nil
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}
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func (o *opHistory) IsHistoryClosed() bool {
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o.fdLock.Lock()
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defer o.fdLock.Unlock()
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return o.fd.Fd() == ^(uintptr(0))
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}
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func (o *opHistory) Init() {
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if o.IsHistoryClosed() {
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o.initHistory()
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}
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}
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func (o *opHistory) initHistory() {
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if o.cfg.HistoryFile != "" {
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o.historyUpdatePath(o.cfg.HistoryFile)
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}
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}
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// only called by newOpHistory
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func (o *opHistory) historyUpdatePath(path string) {
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o.fdLock.Lock()
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defer o.fdLock.Unlock()
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f, err := os.OpenFile(path, os.O_APPEND|os.O_CREATE|os.O_RDWR, 0666)
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if err != nil {
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return
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}
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o.fd = f
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r := bufio.NewReader(o.fd)
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total := 0
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for ; ; total++ {
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line, err := r.ReadString('\n')
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if err != nil {
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break
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}
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// ignore the empty line
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line = strings.TrimSpace(line)
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if len(line) == 0 {
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continue
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}
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o.Push([]rune(line))
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o.Compact()
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}
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if total > o.cfg.HistoryLimit {
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o.rewriteLocked()
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}
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o.historyVer++
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o.Push(nil)
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return
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}
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func (o *opHistory) Compact() {
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for o.history.Len() > o.cfg.HistoryLimit && o.history.Len() > 0 {
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o.history.Remove(o.history.Front())
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}
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}
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func (o *opHistory) Rewrite() {
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o.fdLock.Lock()
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defer o.fdLock.Unlock()
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o.rewriteLocked()
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}
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func (o *opHistory) rewriteLocked() {
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if o.cfg.HistoryFile == "" {
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return
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}
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tmpFile := o.cfg.HistoryFile + ".tmp"
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fd, err := os.OpenFile(tmpFile, os.O_CREATE|os.O_WRONLY|os.O_TRUNC|os.O_APPEND, 0666)
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if err != nil {
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return
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}
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buf := bufio.NewWriter(fd)
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for elem := o.history.Front(); elem != nil; elem = elem.Next() {
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buf.WriteString(string(elem.Value.(*hisItem).Source) + "\n")
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}
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buf.Flush()
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// replace history file
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if err = os.Rename(tmpFile, o.cfg.HistoryFile); err != nil {
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fd.Close()
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return
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}
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if o.fd != nil {
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o.fd.Close()
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}
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// fd is write only, just satisfy what we need.
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o.fd = fd
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}
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func (o *opHistory) Close() {
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o.fdLock.Lock()
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defer o.fdLock.Unlock()
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if o.fd != nil {
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o.fd.Close()
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}
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}
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func (o *opHistory) FindBck(isNewSearch bool, rs []rune, start int) (int, *list.Element) {
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for elem := o.current; elem != nil; elem = elem.Prev() {
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item := o.showItem(elem.Value)
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if isNewSearch {
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start += len(rs)
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}
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if elem == o.current {
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if len(item) >= start {
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item = item[:start]
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}
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}
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idx := runes.IndexAllBckEx(item, rs, o.cfg.HistorySearchFold)
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if idx < 0 {
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continue
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}
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return idx, elem
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}
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return -1, nil
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}
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func (o *opHistory) FindFwd(isNewSearch bool, rs []rune, start int) (int, *list.Element) {
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for elem := o.current; elem != nil; elem = elem.Next() {
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item := o.showItem(elem.Value)
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if isNewSearch {
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start -= len(rs)
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if start < 0 {
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start = 0
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}
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}
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if elem == o.current {
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if len(item)-1 >= start {
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item = item[start:]
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} else {
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continue
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}
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}
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idx := runes.IndexAllEx(item, rs, o.cfg.HistorySearchFold)
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if idx < 0 {
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continue
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}
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if elem == o.current {
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idx += start
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}
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return idx, elem
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}
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return -1, nil
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}
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func (o *opHistory) showItem(obj interface{}) []rune {
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item := obj.(*hisItem)
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if item.Version == o.historyVer {
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return item.Tmp
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}
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return item.Source
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}
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func (o *opHistory) Prev() []rune {
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if o.current == nil {
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return nil
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}
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current := o.current.Prev()
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if current == nil {
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return nil
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}
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o.current = current
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return runes.Copy(o.showItem(current.Value))
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}
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func (o *opHistory) Next() ([]rune, bool) {
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if o.current == nil {
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return nil, false
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}
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current := o.current.Next()
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if current == nil {
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return nil, false
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}
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o.current = current
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return runes.Copy(o.showItem(current.Value)), true
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}
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// Disable the current history
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func (o *opHistory) Disable() {
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o.enable = false
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}
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// Enable the current history
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func (o *opHistory) Enable() {
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o.enable = true
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}
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func (o *opHistory) debug() {
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Debug("-------")
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for item := o.history.Front(); item != nil; item = item.Next() {
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Debug(fmt.Sprintf("%+v", item.Value))
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}
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}
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// save history
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func (o *opHistory) New(current []rune) (err error) {
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// history deactivated
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if !o.enable {
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return nil
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}
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current = runes.Copy(current)
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// if just use last command without modify
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// just clean lastest history
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if back := o.history.Back(); back != nil {
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prev := back.Prev()
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if prev != nil {
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if runes.Equal(current, prev.Value.(*hisItem).Source) {
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o.current = o.history.Back()
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o.current.Value.(*hisItem).Clean()
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o.historyVer++
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return nil
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}
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}
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}
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if len(current) == 0 {
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o.current = o.history.Back()
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if o.current != nil {
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o.current.Value.(*hisItem).Clean()
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o.historyVer++
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return nil
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}
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}
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if o.current != o.history.Back() {
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// move history item to current command
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currentItem := o.current.Value.(*hisItem)
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// set current to last item
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o.current = o.history.Back()
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current = runes.Copy(currentItem.Tmp)
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}
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// err only can be a IO error, just report
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err = o.Update(current, true)
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// push a new one to commit current command
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o.historyVer++
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o.Push(nil)
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return
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}
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func (o *opHistory) Revert() {
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o.historyVer++
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o.current = o.history.Back()
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}
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func (o *opHistory) Update(s []rune, commit bool) (err error) {
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o.fdLock.Lock()
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defer o.fdLock.Unlock()
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s = runes.Copy(s)
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if o.current == nil {
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o.Push(s)
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o.Compact()
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return
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}
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r := o.current.Value.(*hisItem)
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r.Version = o.historyVer
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if commit {
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r.Source = s
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if o.fd != nil {
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// just report the error
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_, err = o.fd.Write([]byte(string(r.Source) + "\n"))
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}
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} else {
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r.Tmp = append(r.Tmp[:0], s...)
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}
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o.current.Value = r
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o.Compact()
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return
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}
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func (o *opHistory) Push(s []rune) {
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s = runes.Copy(s)
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elem := o.history.PushBack(&hisItem{Source: s})
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o.current = elem
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}
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