forked from peco/peco
/
keys.go
179 lines (159 loc) · 3.1 KB
/
keys.go
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package keyseq
import (
"fmt"
"strings"
"unicode/utf8"
"github.com/nsf/termbox-go"
"github.com/pkg/errors"
)
// This map is populated using some magic numbers, which must match
// the values defined in termbox-go. Verification against the actual
// termbox constants are done in the test
var stringToKey = map[string]termbox.Key{}
var keyToString = map[termbox.Key]string{}
func mapkey(n string, k termbox.Key) {
stringToKey[n] = k
keyToString[k] = n
}
func init() {
fidx := 1
for k := termbox.KeyF1; k >= termbox.KeyF12; k-- {
sk := fmt.Sprintf("F%d", fidx)
mapkey(sk, k)
fidx++
}
names := []string{
"Insert",
"Delete",
"Home",
"End",
"Pgup",
"Pgdn",
"ArrowUp",
"ArrowDown",
"ArrowLeft",
"ArrowRight",
}
for i, n := range names {
mapkey(n, termbox.Key(int(termbox.KeyF12)-(i+1)))
}
names = []string{
"Left",
"Middle",
"Right",
}
for i, n := range names {
sk := fmt.Sprintf("Mouse%s", n)
mapkey(sk, termbox.Key(int(termbox.KeyArrowRight)-(i+2)))
}
whacky := [][]string{
{"~", "2", "Space"},
{"a"},
{"b"},
{"c"},
{"d"},
{"e"},
{"f"},
{"g"},
{"h"},
{"i"},
{"j"},
{"k"},
{"l"},
{"m"},
{"n"},
{"o"},
{"p"},
{"q"},
{"r"},
{"s"},
{"t"},
{"u"},
{"v"},
{"w"},
{"x"},
{"y"},
{"z"},
{"[", "3"},
{"4", "\\"},
{"5", "]"},
{"6"},
{"7", "/", "_"},
}
for i, list := range whacky {
for _, n := range list {
sk := fmt.Sprintf("C-%s", n)
mapkey(sk, termbox.Key(int(termbox.KeyCtrlTilde)+i))
}
}
mapkey("BS", termbox.KeyBackspace)
mapkey("Tab", termbox.KeyTab)
mapkey("Enter", termbox.KeyEnter)
mapkey("Esc", termbox.KeyEsc)
mapkey("Space", termbox.KeySpace)
mapkey("BS2", termbox.KeyBackspace2)
mapkey("C-8", termbox.KeyCtrl8)
// panic(fmt.Sprintf("%#q", stringToKey))
}
func ToKeyList(ksk string) (KeyList, error) {
list := KeyList{}
for _, term := range strings.Split(ksk, ",") {
term = strings.TrimSpace(term)
k, m, ch, err := ToKey(term)
if err != nil {
return list, errors.Wrapf(err, "failed to convert '%s'", term)
}
list = append(list, Key{m, k, ch})
}
return list, nil
}
// EventToString returns human readable name for a given termbox.Event
func EventToString(ev termbox.Event) (string, error) {
s := ""
if ev.Key == 0 {
s = string([]rune{ev.Ch})
} else {
var ok bool
s, ok = keyToString[ev.Key]
if !ok {
return "", errors.Errorf("no such key %#v", ev)
}
// Special case for ArrowUp/Down/Left/Right
switch s {
case "ArrowUp":
s = "^"
case "ArrowDown":
s = "v"
case "ArrowLeft":
s = "<"
case "ArrowRight":
s = ">"
}
}
if ev.Mod&termbox.ModAlt == 1 {
return "M-" + s, nil
}
return s, nil
}
func ToKey(key string) (k termbox.Key, modifier ModifierKey, ch rune, err error) {
modifier = ModNone
if strings.HasPrefix(key, "M-") {
modifier = ModAlt
key = key[2:]
if len(key) == 1 {
ch = rune(key[0])
return
}
}
var ok bool
k, ok = stringToKey[key]
if !ok {
// If this is a single rune, just allow it
ch, _ = utf8.DecodeRuneInString(key)
if ch != utf8.RuneError {
return
}
err = errors.Errorf("no such key %s", key)
}
return
}