mirror of https://github.com/chzyer/readline.git
130 lines
2.3 KiB
Go
130 lines
2.3 KiB
Go
package readline
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import (
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"io"
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"os"
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"sync"
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"sync/atomic"
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)
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var (
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Stdin io.ReadCloser = os.Stdin
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Stdout io.WriteCloser = os.Stdout
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Stderr io.WriteCloser = os.Stderr
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)
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var (
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std *Instance
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stdOnce sync.Once
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)
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// global instance will not submit history automatic
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func getInstance() *Instance {
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stdOnce.Do(func() {
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std, _ = NewEx(&Config{
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DisableAutoSaveHistory: true,
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})
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})
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return std
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}
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// let readline load history from filepath
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// and try to persist history into disk
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// set fp to "" to prevent readline persisting history to disk
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// so the `AddHistory` will return nil error forever.
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func SetHistoryPath(fp string) {
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ins := getInstance()
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cfg := ins.Config.Clone()
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cfg.HistoryFile = fp
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ins.SetConfig(cfg)
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}
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// set auto completer to global instance
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func SetAutoComplete(completer AutoCompleter) {
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ins := getInstance()
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cfg := ins.Config.Clone()
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cfg.AutoComplete = completer
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ins.SetConfig(cfg)
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}
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// add history to global instance manually
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// raise error only if `SetHistoryPath` is set with a non-empty path
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func AddHistory(content string) error {
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ins := getInstance()
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return ins.SaveHistory(content)
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}
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func Password(prompt string) ([]byte, error) {
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ins := getInstance()
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return ins.ReadPassword(prompt)
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}
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// readline with global configs
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func Line(prompt string) (string, error) {
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ins := getInstance()
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ins.SetPrompt(prompt)
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return ins.Readline()
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}
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type CancelableStdin struct {
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r io.Reader
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mutex sync.Mutex
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stop chan struct{}
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closed int32
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notify chan struct{}
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data []byte
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read int
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err error
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}
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func NewCancelableStdin(r io.Reader) *CancelableStdin {
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c := &CancelableStdin{
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r: r,
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notify: make(chan struct{}),
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stop: make(chan struct{}),
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}
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go c.ioloop()
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return c
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}
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func (c *CancelableStdin) ioloop() {
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loop:
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for {
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select {
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case <-c.notify:
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c.read, c.err = c.r.Read(c.data)
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select {
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case c.notify <- struct{}{}:
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case <-c.stop:
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break loop
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}
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case <-c.stop:
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break loop
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}
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}
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}
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func (c *CancelableStdin) Read(b []byte) (n int, err error) {
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c.mutex.Lock()
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defer c.mutex.Unlock()
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if atomic.LoadInt32(&c.closed) == 1 {
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return 0, io.EOF
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}
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c.data = b
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c.notify <- struct{}{}
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select {
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case <-c.notify:
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return c.read, c.err
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case <-c.stop:
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return 0, io.EOF
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}
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}
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func (c *CancelableStdin) Close() error {
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if atomic.CompareAndSwapInt32(&c.closed, 0, 1) {
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close(c.stop)
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}
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return nil
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}
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