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aerc/config/bindings.go
Moritz Poldrack 978d35d356 lint: homogenize operations and minor fixes (gocritic) 
Apply GoDoc comment policy (comments for humans should have a space
after the //; machine-readable comments shouldn't)

Use strings.ReplaceAll instead of strings.Replace when appropriate

Remove if/else chains by replacing them with switches

Use short assignment/increment notation

Replace single case switches with if statements

Combine else and if when appropriate

Signed-off-by: Moritz Poldrack <moritz@poldrack.dev>
Acked-by: Robin Jarry <robin@jarry.cc>
2022-08-04 21:58:01 +02:00

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package config
import (
"bytes"
"errors"
"fmt"
"io"
"strings"
"github.com/gdamore/tcell/v2"
)
type KeyStroke struct {
Modifiers tcell.ModMask
Key tcell.Key
Rune rune
}
type Binding struct {
Output []KeyStroke
Input []KeyStroke
}
type KeyBindings struct {
bindings []*Binding
// If false, disable global keybindings in this context
Globals bool
// Which key opens the ex line (default is :)
ExKey KeyStroke
}
const (
BINDING_FOUND = iota
BINDING_INCOMPLETE
BINDING_NOT_FOUND
)
type BindingSearchResult int
func NewKeyBindings() *KeyBindings {
return &KeyBindings{
ExKey: KeyStroke{tcell.ModNone, tcell.KeyRune, ':'},
Globals: true,
}
}
func MergeBindings(bindings ...*KeyBindings) *KeyBindings {
merged := NewKeyBindings()
for _, b := range bindings {
merged.bindings = append(merged.bindings, b.bindings...)
}
merged.ExKey = bindings[0].ExKey
merged.Globals = bindings[0].Globals
return merged
}
func (config AercConfig) MergeContextualBinds(baseBinds *KeyBindings,
contextType ContextType, reg string, bindCtx string,
) *KeyBindings {
bindings := baseBinds
for _, contextualBind := range config.ContextualBinds {
if contextualBind.ContextType != contextType {
continue
}
if !contextualBind.Regex.Match([]byte(reg)) {
continue
}
if contextualBind.BindContext != bindCtx {
continue
}
bindings = MergeBindings(contextualBind.Bindings, bindings)
}
return bindings
}
func (bindings *KeyBindings) Add(binding *Binding) {
// TODO: Search for conflicts?
bindings.bindings = append(bindings.bindings, binding)
}
func (bindings *KeyBindings) GetBinding(
input []KeyStroke,
) (BindingSearchResult, []KeyStroke) {
incomplete := false
// TODO: This could probably be a sorted list to speed things up
// TODO: Deal with bindings that share a prefix
for _, binding := range bindings.bindings {
if len(binding.Input) < len(input) {
continue
}
for i, stroke := range input {
if stroke.Modifiers != binding.Input[i].Modifiers {
goto next
}
if stroke.Key != binding.Input[i].Key {
goto next
}
if stroke.Key == tcell.KeyRune &&
stroke.Rune != binding.Input[i].Rune {
goto next
}
}
if len(binding.Input) != len(input) {
incomplete = true
} else {
return BINDING_FOUND, binding.Output
}
next:
}
if incomplete {
return BINDING_INCOMPLETE, nil
}
return BINDING_NOT_FOUND, nil
}
func (bindings *KeyBindings) GetReverseBindings(output []KeyStroke) [][]KeyStroke {
var inputs [][]KeyStroke
for _, binding := range bindings.bindings {
if len(binding.Output) != len(output) {
continue
}
for i, stroke := range output {
if stroke.Modifiers != binding.Output[i].Modifiers {
goto next
}
if stroke.Key != binding.Output[i].Key {
goto next
}
if stroke.Key == tcell.KeyRune && stroke.Rune != binding.Output[i].Rune {
goto next
}
}
inputs = append(inputs, binding.Input)
next:
}
return inputs
}
func FormatKeyStrokes(keystrokes []KeyStroke) string {
var sb strings.Builder
for _, stroke := range keystrokes {
s := ""
for name, ks := range keyNames {
if ks.Modifiers == stroke.Modifiers && ks.Key == stroke.Key && ks.Rune == stroke.Rune {
if name == "cr" {
name = "enter"
}
s = fmt.Sprintf("<%s>", name)
break
}
}
if s == "" && stroke.Key == tcell.KeyRune {
s = string(stroke.Rune)
}
sb.WriteString(s)
}
return sb.String()
}
var keyNames map[string]KeyStroke
func ParseKeyStrokes(keystrokes string) ([]KeyStroke, error) {
var strokes []KeyStroke
buf := bytes.NewBufferString(keystrokes)
for {
tok, _, err := buf.ReadRune()
if err == io.EOF {
break
} else if err != nil {
return nil, err
}
// TODO: make it possible to bind to < or > themselves (and default to
// switching accounts)
switch tok {
case '<':
name, err := buf.ReadString(byte('>'))
switch {
case err == io.EOF:
return nil, errors.New("Expecting '>'")
case err != nil:
return nil, err
case name == ">":
return nil, errors.New("Expected a key name")
}
name = name[:len(name)-1]
if key, ok := keyNames[strings.ToLower(name)]; ok {
strokes = append(strokes, key)
} else {
return nil, fmt.Errorf("Unknown key '%s'", name)
}
case '>':
return nil, errors.New("Found '>' without '<'")
case '\\':
tok, _, err = buf.ReadRune()
if err == io.EOF {
tok = '\\'
} else if err != nil {
return nil, err
}
fallthrough
default:
strokes = append(strokes, KeyStroke{
Modifiers: tcell.ModNone,
Key: tcell.KeyRune,
Rune: tok,
})
}
}
return strokes, nil
}
func ParseBinding(input, output string) (*Binding, error) {
in, err := ParseKeyStrokes(input)
if err != nil {
return nil, err
}
out, err := ParseKeyStrokes(output)
if err != nil {
return nil, err
}
return &Binding{
Input: in,
Output: out,
}, nil
}
func init() {
keyNames = make(map[string]KeyStroke)
keyNames["space"] = KeyStroke{tcell.ModNone, tcell.KeyRune, ' '}
keyNames["semicolon"] = KeyStroke{tcell.ModNone, tcell.KeyRune, ';'}
keyNames["enter"] = KeyStroke{tcell.ModNone, tcell.KeyEnter, 0}
keyNames["c-enter"] = KeyStroke{tcell.ModCtrl, tcell.KeyEnter, 0}
keyNames["up"] = KeyStroke{tcell.ModNone, tcell.KeyUp, 0}
keyNames["c-up"] = KeyStroke{tcell.ModCtrl, tcell.KeyUp, 0}
keyNames["down"] = KeyStroke{tcell.ModNone, tcell.KeyDown, 0}
keyNames["c-down"] = KeyStroke{tcell.ModCtrl, tcell.KeyDown, 0}
keyNames["right"] = KeyStroke{tcell.ModNone, tcell.KeyRight, 0}
keyNames["c-right"] = KeyStroke{tcell.ModCtrl, tcell.KeyRight, 0}
keyNames["left"] = KeyStroke{tcell.ModNone, tcell.KeyLeft, 0}
keyNames["c-left"] = KeyStroke{tcell.ModCtrl, tcell.KeyLeft, 0}
keyNames["upleft"] = KeyStroke{tcell.ModNone, tcell.KeyUpLeft, 0}
keyNames["upright"] = KeyStroke{tcell.ModNone, tcell.KeyUpRight, 0}
keyNames["downleft"] = KeyStroke{tcell.ModNone, tcell.KeyDownLeft, 0}
keyNames["downright"] = KeyStroke{tcell.ModNone, tcell.KeyDownRight, 0}
keyNames["center"] = KeyStroke{tcell.ModNone, tcell.KeyCenter, 0}
keyNames["pgup"] = KeyStroke{tcell.ModNone, tcell.KeyPgUp, 0}
keyNames["c-pgup"] = KeyStroke{tcell.ModCtrl, tcell.KeyPgUp, 0}
keyNames["pgdn"] = KeyStroke{tcell.ModNone, tcell.KeyPgDn, 0}
keyNames["c-pgdn"] = KeyStroke{tcell.ModCtrl, tcell.KeyPgDn, 0}
keyNames["home"] = KeyStroke{tcell.ModNone, tcell.KeyHome, 0}
keyNames["end"] = KeyStroke{tcell.ModNone, tcell.KeyEnd, 0}
keyNames["insert"] = KeyStroke{tcell.ModNone, tcell.KeyInsert, 0}
keyNames["delete"] = KeyStroke{tcell.ModNone, tcell.KeyDelete, 0}
keyNames["help"] = KeyStroke{tcell.ModNone, tcell.KeyHelp, 0}
keyNames["exit"] = KeyStroke{tcell.ModNone, tcell.KeyExit, 0}
keyNames["clear"] = KeyStroke{tcell.ModNone, tcell.KeyClear, 0}
keyNames["cancel"] = KeyStroke{tcell.ModNone, tcell.KeyCancel, 0}
keyNames["print"] = KeyStroke{tcell.ModNone, tcell.KeyPrint, 0}
keyNames["pause"] = KeyStroke{tcell.ModNone, tcell.KeyPause, 0}
keyNames["backtab"] = KeyStroke{tcell.ModNone, tcell.KeyBacktab, 0}
keyNames["f1"] = KeyStroke{tcell.ModNone, tcell.KeyF1, 0}
keyNames["f2"] = KeyStroke{tcell.ModNone, tcell.KeyF2, 0}
keyNames["f3"] = KeyStroke{tcell.ModNone, tcell.KeyF3, 0}
keyNames["f4"] = KeyStroke{tcell.ModNone, tcell.KeyF4, 0}
keyNames["f5"] = KeyStroke{tcell.ModNone, tcell.KeyF5, 0}
keyNames["f6"] = KeyStroke{tcell.ModNone, tcell.KeyF6, 0}
keyNames["f7"] = KeyStroke{tcell.ModNone, tcell.KeyF7, 0}
keyNames["f8"] = KeyStroke{tcell.ModNone, tcell.KeyF8, 0}
keyNames["f9"] = KeyStroke{tcell.ModNone, tcell.KeyF9, 0}
keyNames["f10"] = KeyStroke{tcell.ModNone, tcell.KeyF10, 0}
keyNames["f11"] = KeyStroke{tcell.ModNone, tcell.KeyF11, 0}
keyNames["f12"] = KeyStroke{tcell.ModNone, tcell.KeyF12, 0}
keyNames["f13"] = KeyStroke{tcell.ModNone, tcell.KeyF13, 0}
keyNames["f14"] = KeyStroke{tcell.ModNone, tcell.KeyF14, 0}
keyNames["f15"] = KeyStroke{tcell.ModNone, tcell.KeyF15, 0}
keyNames["f16"] = KeyStroke{tcell.ModNone, tcell.KeyF16, 0}
keyNames["f17"] = KeyStroke{tcell.ModNone, tcell.KeyF17, 0}
keyNames["f18"] = KeyStroke{tcell.ModNone, tcell.KeyF18, 0}
keyNames["f19"] = KeyStroke{tcell.ModNone, tcell.KeyF19, 0}
keyNames["f20"] = KeyStroke{tcell.ModNone, tcell.KeyF20, 0}
keyNames["f21"] = KeyStroke{tcell.ModNone, tcell.KeyF21, 0}
keyNames["f22"] = KeyStroke{tcell.ModNone, tcell.KeyF22, 0}
keyNames["f23"] = KeyStroke{tcell.ModNone, tcell.KeyF23, 0}
keyNames["f24"] = KeyStroke{tcell.ModNone, tcell.KeyF24, 0}
keyNames["f25"] = KeyStroke{tcell.ModNone, tcell.KeyF25, 0}
keyNames["f26"] = KeyStroke{tcell.ModNone, tcell.KeyF26, 0}
keyNames["f27"] = KeyStroke{tcell.ModNone, tcell.KeyF27, 0}
keyNames["f28"] = KeyStroke{tcell.ModNone, tcell.KeyF28, 0}
keyNames["f29"] = KeyStroke{tcell.ModNone, tcell.KeyF29, 0}
keyNames["f30"] = KeyStroke{tcell.ModNone, tcell.KeyF30, 0}
keyNames["f31"] = KeyStroke{tcell.ModNone, tcell.KeyF31, 0}
keyNames["f32"] = KeyStroke{tcell.ModNone, tcell.KeyF32, 0}
keyNames["f33"] = KeyStroke{tcell.ModNone, tcell.KeyF33, 0}
keyNames["f34"] = KeyStroke{tcell.ModNone, tcell.KeyF34, 0}
keyNames["f35"] = KeyStroke{tcell.ModNone, tcell.KeyF35, 0}
keyNames["f36"] = KeyStroke{tcell.ModNone, tcell.KeyF36, 0}
keyNames["f37"] = KeyStroke{tcell.ModNone, tcell.KeyF37, 0}
keyNames["f38"] = KeyStroke{tcell.ModNone, tcell.KeyF38, 0}
keyNames["f39"] = KeyStroke{tcell.ModNone, tcell.KeyF39, 0}
keyNames["f40"] = KeyStroke{tcell.ModNone, tcell.KeyF40, 0}
keyNames["f41"] = KeyStroke{tcell.ModNone, tcell.KeyF41, 0}
keyNames["f42"] = KeyStroke{tcell.ModNone, tcell.KeyF42, 0}
keyNames["f43"] = KeyStroke{tcell.ModNone, tcell.KeyF43, 0}
keyNames["f44"] = KeyStroke{tcell.ModNone, tcell.KeyF44, 0}
keyNames["f45"] = KeyStroke{tcell.ModNone, tcell.KeyF45, 0}
keyNames["f46"] = KeyStroke{tcell.ModNone, tcell.KeyF46, 0}
keyNames["f47"] = KeyStroke{tcell.ModNone, tcell.KeyF47, 0}
keyNames["f48"] = KeyStroke{tcell.ModNone, tcell.KeyF48, 0}
keyNames["f49"] = KeyStroke{tcell.ModNone, tcell.KeyF49, 0}
keyNames["f50"] = KeyStroke{tcell.ModNone, tcell.KeyF50, 0}
keyNames["f51"] = KeyStroke{tcell.ModNone, tcell.KeyF51, 0}
keyNames["f52"] = KeyStroke{tcell.ModNone, tcell.KeyF52, 0}
keyNames["f53"] = KeyStroke{tcell.ModNone, tcell.KeyF53, 0}
keyNames["f54"] = KeyStroke{tcell.ModNone, tcell.KeyF54, 0}
keyNames["f55"] = KeyStroke{tcell.ModNone, tcell.KeyF55, 0}
keyNames["f56"] = KeyStroke{tcell.ModNone, tcell.KeyF56, 0}
keyNames["f57"] = KeyStroke{tcell.ModNone, tcell.KeyF57, 0}
keyNames["f58"] = KeyStroke{tcell.ModNone, tcell.KeyF58, 0}
keyNames["f59"] = KeyStroke{tcell.ModNone, tcell.KeyF59, 0}
keyNames["f60"] = KeyStroke{tcell.ModNone, tcell.KeyF60, 0}
keyNames["f61"] = KeyStroke{tcell.ModNone, tcell.KeyF61, 0}
keyNames["f62"] = KeyStroke{tcell.ModNone, tcell.KeyF62, 0}
keyNames["f63"] = KeyStroke{tcell.ModNone, tcell.KeyF63, 0}
keyNames["f64"] = KeyStroke{tcell.ModNone, tcell.KeyF64, 0}
keyNames["c-space"] = KeyStroke{tcell.ModCtrl, tcell.KeyCtrlSpace, 0}
keyNames["c-a"] = KeyStroke{tcell.ModCtrl, tcell.KeyCtrlA, 0}
keyNames["c-b"] = KeyStroke{tcell.ModCtrl, tcell.KeyCtrlB, 0}
keyNames["c-c"] = KeyStroke{tcell.ModCtrl, tcell.KeyCtrlC, 0}
keyNames["c-d"] = KeyStroke{tcell.ModCtrl, tcell.KeyCtrlD, 0}
keyNames["c-e"] = KeyStroke{tcell.ModCtrl, tcell.KeyCtrlE, 0}
keyNames["c-f"] = KeyStroke{tcell.ModCtrl, tcell.KeyCtrlF, 0}
keyNames["c-g"] = KeyStroke{tcell.ModCtrl, tcell.KeyCtrlG, 0}
keyNames["c-h"] = KeyStroke{tcell.ModNone, tcell.KeyCtrlH, 0}
keyNames["c-i"] = KeyStroke{tcell.ModNone, tcell.KeyCtrlI, 0}
keyNames["c-j"] = KeyStroke{tcell.ModCtrl, tcell.KeyCtrlJ, 0}
keyNames["c-k"] = KeyStroke{tcell.ModCtrl, tcell.KeyCtrlK, 0}
keyNames["c-l"] = KeyStroke{tcell.ModCtrl, tcell.KeyCtrlL, 0}
keyNames["c-m"] = KeyStroke{tcell.ModNone, tcell.KeyCtrlM, 0}
keyNames["c-n"] = KeyStroke{tcell.ModCtrl, tcell.KeyCtrlN, 0}
keyNames["c-o"] = KeyStroke{tcell.ModCtrl, tcell.KeyCtrlO, 0}
keyNames["c-p"] = KeyStroke{tcell.ModCtrl, tcell.KeyCtrlP, 0}
keyNames["c-q"] = KeyStroke{tcell.ModCtrl, tcell.KeyCtrlQ, 0}
keyNames["c-r"] = KeyStroke{tcell.ModCtrl, tcell.KeyCtrlR, 0}
keyNames["c-s"] = KeyStroke{tcell.ModCtrl, tcell.KeyCtrlS, 0}
keyNames["c-t"] = KeyStroke{tcell.ModCtrl, tcell.KeyCtrlT, 0}
keyNames["c-u"] = KeyStroke{tcell.ModCtrl, tcell.KeyCtrlU, 0}
keyNames["c-v"] = KeyStroke{tcell.ModCtrl, tcell.KeyCtrlV, 0}
keyNames["c-w"] = KeyStroke{tcell.ModCtrl, tcell.KeyCtrlW, 0}
keyNames["c-x"] = KeyStroke{tcell.ModCtrl, tcell.KeyCtrlX, rune(tcell.KeyCAN)}
keyNames["c-y"] = KeyStroke{tcell.ModCtrl, tcell.KeyCtrlY, 0} // TODO: runes for the rest
keyNames["c-z"] = KeyStroke{tcell.ModCtrl, tcell.KeyCtrlZ, 0}
keyNames["c-]"] = KeyStroke{tcell.ModCtrl, tcell.KeyCtrlRightSq, 0}
keyNames["c-\\"] = KeyStroke{tcell.ModCtrl, tcell.KeyCtrlBackslash, 0}
keyNames["c-["] = KeyStroke{tcell.ModCtrl, tcell.KeyCtrlLeftSq, 0}
keyNames["c-^"] = KeyStroke{tcell.ModCtrl, tcell.KeyCtrlCarat, 0}
keyNames["c-_"] = KeyStroke{tcell.ModCtrl, tcell.KeyCtrlUnderscore, 0}
keyNames["nul"] = KeyStroke{tcell.ModNone, tcell.KeyNUL, 0}
keyNames["soh"] = KeyStroke{tcell.ModNone, tcell.KeySOH, 0}
keyNames["stx"] = KeyStroke{tcell.ModNone, tcell.KeySTX, 0}
keyNames["etx"] = KeyStroke{tcell.ModNone, tcell.KeyETX, 0}
keyNames["eot"] = KeyStroke{tcell.ModNone, tcell.KeyEOT, 0}
keyNames["enq"] = KeyStroke{tcell.ModNone, tcell.KeyENQ, 0}
keyNames["ack"] = KeyStroke{tcell.ModNone, tcell.KeyACK, 0}
keyNames["bel"] = KeyStroke{tcell.ModNone, tcell.KeyBEL, 0}
keyNames["bs"] = KeyStroke{tcell.ModNone, tcell.KeyBS, 0}
keyNames["tab"] = KeyStroke{tcell.ModNone, tcell.KeyTAB, 0}
keyNames["lf"] = KeyStroke{tcell.ModNone, tcell.KeyLF, 0}
keyNames["vt"] = KeyStroke{tcell.ModNone, tcell.KeyVT, 0}
keyNames["ff"] = KeyStroke{tcell.ModNone, tcell.KeyFF, 0}
keyNames["cr"] = KeyStroke{tcell.ModNone, tcell.KeyCR, 0}
keyNames["so"] = KeyStroke{tcell.ModNone, tcell.KeySO, 0}
keyNames["si"] = KeyStroke{tcell.ModNone, tcell.KeySI, 0}
keyNames["dle"] = KeyStroke{tcell.ModNone, tcell.KeyDLE, 0}
keyNames["dc1"] = KeyStroke{tcell.ModNone, tcell.KeyDC1, 0}
keyNames["dc2"] = KeyStroke{tcell.ModNone, tcell.KeyDC2, 0}
keyNames["dc3"] = KeyStroke{tcell.ModNone, tcell.KeyDC3, 0}
keyNames["dc4"] = KeyStroke{tcell.ModNone, tcell.KeyDC4, 0}
keyNames["nak"] = KeyStroke{tcell.ModNone, tcell.KeyNAK, 0}
keyNames["syn"] = KeyStroke{tcell.ModNone, tcell.KeySYN, 0}
keyNames["etb"] = KeyStroke{tcell.ModNone, tcell.KeyETB, 0}
keyNames["can"] = KeyStroke{tcell.ModNone, tcell.KeyCAN, 0}
keyNames["em"] = KeyStroke{tcell.ModNone, tcell.KeyEM, 0}
keyNames["sub"] = KeyStroke{tcell.ModNone, tcell.KeySUB, 0}
keyNames["esc"] = KeyStroke{tcell.ModNone, tcell.KeyESC, 0}
keyNames["fs"] = KeyStroke{tcell.ModNone, tcell.KeyFS, 0}
keyNames["gs"] = KeyStroke{tcell.ModNone, tcell.KeyGS, 0}
keyNames["rs"] = KeyStroke{tcell.ModNone, tcell.KeyRS, 0}
keyNames["us"] = KeyStroke{tcell.ModNone, tcell.KeyUS, 0}
keyNames["del"] = KeyStroke{tcell.ModNone, tcell.KeyDEL, 0}
}
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