mirror of https://github.com/chzyer/readline.git
306 lines
18 KiB
Markdown
306 lines
18 KiB
Markdown
# readline
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[](LICENSE.md)
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[](https://travis-ci.org/chzyer/readline)
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[](https://godoc.org/github.com/chzyer/readline)
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[](https://gitter.im/chzyer/readline?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge)
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[](#backers)
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[](#sponsors)
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Readline is A Pure Go Implementation of a libreadline-style Library.
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The goal is to be a powerful alternater for GNU-Readline.
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**WHY:**
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Readline will support most of features which GNU Readline is supported, and provide a pure go environment and a MIT license.
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It can also provides shell-like interactives by using [flagly](https://github.com/chzyer/flagly) (demo: [flagly-shell](https://github.com/chzyer/flagly/blob/master/demo/flagly-shell/flagly-shell.go))
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# Demo
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Also works fine in windows
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* [example/readline-demo](https://github.com/chzyer/readline/blob/master/example/readline-demo/readline-demo.go) The source code about the demo above
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* [example/readline-im](https://github.com/chzyer/readline/blob/master/example/readline-im/readline-im.go) Example for how to write a IM program.
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* [example/readline-multiline](https://github.com/chzyer/readline/blob/master/example/readline-multiline/readline-multiline.go) Example for how to parse command which can submit by multiple time.
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* [example/readline-pass-strength](https://github.com/chzyer/readline/blob/master/example/readline-pass-strength/readline-pass-strength.go) A example about checking password strength, written by [@sahib](https://github.com/sahib)
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# Todo
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* Vi Mode is not completely finish
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* More funny examples
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* Support dumb/eterm-color terminal in emacs
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# Features
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* Support emacs/vi mode, almost all basic features that GNU-Readline is supported
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* zsh-style backward/forward history search
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* zsh-style completion
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* Readline auto refresh when others write to Stdout while editing (it needs specify the Stdout/Stderr provided by *readline.Instance to others).
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* Support colourful prompt in all platforms.
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# Usage
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* Import package
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```
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go get gopkg.in/readline.v1
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```
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or
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```
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go get github.com/chzyer/readline
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```
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* Simplest example
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```go
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import "gopkg.in/readline.v1"
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rl, err := readline.New("> ")
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if err != nil {
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panic(err)
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}
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defer rl.Close()
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for {
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line, err := rl.Readline()
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if err != nil { // io.EOF, readline.ErrInterrupt
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break
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}
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println(line)
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}
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```
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* Example with durable history
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```go
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rl, err := readline.NewEx(&readline.Config{
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Prompt: "> ",
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HistoryFile: "/tmp/readline.tmp",
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})
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if err != nil {
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panic(err)
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}
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defer rl.Close()
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for {
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line, err := rl.Readline()
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if err != nil { // io.EOF, readline.ErrInterrupt
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break
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}
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println(line)
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}
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```
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* Example with auto completion
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```go
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import (
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"gopkg.in/readline.v1"
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)
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var completer = readline.NewPrefixCompleter(
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readline.PcItem("say",
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readline.PcItem("hello"),
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readline.PcItem("bye"),
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),
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readline.PcItem("help"),
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)
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rl, err := readline.NewEx(&readline.Config{
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Prompt: "> ",
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AutoComplete: completer,
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})
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if err != nil {
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panic(err)
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}
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defer rl.Close()
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for {
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line, err := rl.Readline()
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if err != nil { // io.EOF, readline.ErrInterrupt
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break
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}
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println(line)
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}
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```
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# Shortcut
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`Meta`+`B` means press `Esc` and `n` separately.
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Users can change that in terminal simulator(i.e. iTerm2) to `Alt`+`B`
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Notice: `Meta`+`B` is equals with `Alt`+`B` in windows.
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* Shortcut in normal mode
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| Shortcut | Comment |
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|--------------------|------------------------------------------|
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| `Ctrl`+`A` | Beginning of line |
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| `Ctrl`+`B` / `←` | Backward one character |
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| `Meta`+`B` | Backward one word |
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| `Ctrl`+`C` | Send io.EOF |
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| `Ctrl`+`D` | Delete one character |
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| `Meta`+`D` | Delete one word |
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| `Ctrl`+`E` | End of line |
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| `Ctrl`+`F` / `→` | Forward one character |
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| `Meta`+`F` | Forward one word |
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| `Ctrl`+`G` | Cancel |
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| `Ctrl`+`H` | Delete previous character |
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| `Ctrl`+`I` / `Tab` | Command line completion |
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| `Ctrl`+`J` | Line feed |
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| `Ctrl`+`K` | Cut text to the end of line |
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| `Ctrl`+`L` | Clean screen (TODO) |
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| `Ctrl`+`M` | Same as Enter key |
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| `Ctrl`+`N` / `↓` | Next line (in history) |
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| `Ctrl`+`P` / `↑` | Prev line (in history) |
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| `Ctrl`+`R` | Search backwards in history |
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| `Ctrl`+`S` | Search forwards in history |
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| `Ctrl`+`T` | Transpose characters |
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| `Meta`+`T` | Transpose words (TODO) |
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| `Ctrl`+`U` | Cut text to the beginning of line |
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| `Ctrl`+`W` | Cut previous word |
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| `Backspace` | Delete previous character |
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| `Meta`+`Backspace` | Cut previous word |
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| `Enter` | Line feed |
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* Shortcut in Search Mode (`Ctrl`+`S` or `Ctrl`+`r` to enter this mode)
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| Shortcut | Comment |
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|-------------------------|---------------------------------------------|
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| `Ctrl`+`S` | Search forwards in history |
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| `Ctrl`+`R` | Search backwards in history |
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| `Ctrl`+`C` / `Ctrl`+`G` | Exit Search Mode and revert the history |
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| `Backspace` | Delete previous character |
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| Other | Exit Search Mode |
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* Shortcut in Complete Select Mode (double `Tab` to enter this mode)
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| Shortcut | Comment |
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|-------------------------|---------------------------------------------|
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| `Ctrl`+`F` | Move Forward |
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| `Ctrl`+`B` | Move Backward |
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| `Ctrl`+`N` | Move to next line |
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| `Ctrl`+`P` | Move to previous line |
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| `Ctrl`+`A` | Move to the first candicate in current line |
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| `Ctrl`+`E` | Move to the last candicate in current line |
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| `Tab` / `Enter` | Use the word on cursor to complete |
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| `Ctrl`+`C` / `Ctrl`+`G` | Exit Complete Select Mode |
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| Other | Exit Complete Select Mode |
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# Tested with
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| Environment | $TERM |
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|-------------------------------|--------|
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| Mac OS X iTerm2 | xterm |
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| Mac OS X default Terminal.app | xterm |
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| Mac OS X iTerm2 Screen | screen |
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| Mac OS X iTerm2 Tmux | screen |
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| Ubuntu Server 14.04 LTS | linux |
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| Centos 7 | linux |
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| Windows 10 | - |
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### Notice:
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* `Ctrl`+`A` is not working in `screen` because it used as a control command by default
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If you test it otherwhere, whether it works fine or not, please let me know!
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## Who is using Readline
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* [cockroachdb/cockroach](https://github.com/cockroachdb/cockroach)
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* [youtube/doorman](https://github.com/youtube/doorman)
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* [bom-d-van/harp](https://github.com/bom-d-van/harp)
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* [abiosoft/ishell](https://github.com/abiosoft/ishell)
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* [robertkrimen/otto](https://github.com/robertkrimen/otto)
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* [Netflix/hal-9001](https://github.com/Netflix/hal-9001)
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# Feedback
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If you have any questions, please submit a github issue and any pull requests is welcomed :)
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* [https://twitter.com/chzyer](https://twitter.com/chzyer)
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* [http://weibo.com/2145262190](http://weibo.com/2145262190)
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# Backers
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Love Readline? Help me keep it alive by donating funds to cover project expenses!<br />
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[[Become a backer](https://opencollective.com/readline#backer)]
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<a href="https://opencollective.com/readline/backer/0/website" target="_blank"><img src="https://opencollective.com/readline/backer/0/avatar.svg"></a>
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<a href="https://opencollective.com/readline/backer/1/website" target="_blank"><img src="https://opencollective.com/readline/backer/1/avatar.svg"></a>
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<a href="https://opencollective.com/readline/backer/2/website" target="_blank"><img src="https://opencollective.com/readline/backer/2/avatar.svg"></a>
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<a href="https://opencollective.com/readline/backer/3/website" target="_blank"><img src="https://opencollective.com/readline/backer/3/avatar.svg"></a>
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<a href="https://opencollective.com/readline/backer/29/website" target="_blank"><img src="https://opencollective.com/readline/backer/29/avatar.svg"></a>
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# Sponsors
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Become a sponsor and get your logo here on our Github page. [[Become a sponsor](https://opencollective.com/readline#sponsor)]
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<a href="https://opencollective.com/readline/sponsor/0/website" target="_blank"><img src="https://opencollective.com/readline/sponsor/0/avatar.svg"></a>
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<a href="https://opencollective.com/readline/sponsor/1/website" target="_blank"><img src="https://opencollective.com/readline/sponsor/1/avatar.svg"></a>
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<a href="https://opencollective.com/readline/sponsor/2/website" target="_blank"><img src="https://opencollective.com/readline/sponsor/2/avatar.svg"></a>
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<a href="https://opencollective.com/readline/sponsor/27/website" target="_blank"><img src="https://opencollective.com/readline/sponsor/27/avatar.svg"></a>
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