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bee/vendor/github.com/peterh/liner/README.md
2017-03-19 23:48:59 +01:00

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Liner
=====
Liner is a command line editor with history. It was inspired by linenoise;
everything Unix-like is a VT100 (or is trying very hard to be). If your
terminal is not pretending to be a VT100, change it. Liner also support
Windows.
Liner is released under the X11 license (which is similar to the new BSD
license).
Line Editing
------------
The following line editing commands are supported on platforms and terminals
that Liner supports:
Keystroke | Action
--------- | ------
Ctrl-A, Home | Move cursor to beginning of line
Ctrl-E, End | Move cursor to end of line
Ctrl-B, Left | Move cursor one character left
Ctrl-F, Right| Move cursor one character right
Ctrl-Left, Alt-B | Move cursor to previous word
Ctrl-Right, Alt-F | Move cursor to next word
Ctrl-D, Del | (if line is *not* empty) Delete character under cursor
Ctrl-D | (if line *is* empty) End of File - usually quits application
Ctrl-C | Reset input (create new empty prompt)
Ctrl-L | Clear screen (line is unmodified)
Ctrl-T | Transpose previous character with current character
Ctrl-H, BackSpace | Delete character before cursor
Ctrl-W | Delete word leading up to cursor
Ctrl-K | Delete from cursor to end of line
Ctrl-U | Delete from start of line to cursor
Ctrl-P, Up | Previous match from history
Ctrl-N, Down | Next match from history
Ctrl-R | Reverse Search history (Ctrl-S forward, Ctrl-G cancel)
Ctrl-Y | Paste from Yank buffer (Alt-Y to paste next yank instead)
Tab | Next completion
Shift-Tab | (after Tab) Previous completion
Getting started
-----------------
```go
package main
import (
"log"
"os"
"path/filepath"
"strings"
"github.com/peterh/liner"
)
var (
history_fn = filepath.Join(os.TempDir(), ".liner_example_history")
names = []string{"john", "james", "mary", "nancy"}
)
func main() {
line := liner.NewLiner()
defer line.Close()
line.SetCtrlCAborts(true)
line.SetCompleter(func(line string) (c []string) {
for _, n := range names {
if strings.HasPrefix(n, strings.ToLower(line)) {
c = append(c, n)
}
}
return
})
if f, err := os.Open(history_fn); err == nil {
line.ReadHistory(f)
f.Close()
}
if name, err := line.Prompt("What is your name? "); err == nil {
log.Print("Got: ", name)
line.AppendHistory(name)
} else if err == liner.ErrPromptAborted {
log.Print("Aborted")
} else {
log.Print("Error reading line: ", err)
}
if f, err := os.Create(history_fn); err != nil {
log.Print("Error writing history file: ", err)
} else {
line.WriteHistory(f)
f.Close()
}
}
```
For documentation, see http://godoc.org/github.com/peterh/liner