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bindings.go
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bindings.go
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package keybindings
import (
"errors"
"fmt"
"strings"
"github.com/lawrencegripper/azbrowse/internal/pkg/config"
"github.com/stuartleeks/gocui"
)
// KeyMap reprsents the current mappings from Handler -> Key
type KeyMap map[string][]interface{}
var keyHandlers []KeyHandler
var overrides KeyMap
var usedKeys map[string]string
// Bind sets up key bindings for AzBrowse
func Bind(g *gocui.Gui) error {
config, err := config.Load()
if err != nil {
return err
}
return bindWithConfigOverrides(g, config.KeyBindings)
}
func bindWithConfigOverrides(g *gocui.Gui, keyOverrideSettings map[string]interface{}) error {
err := initializeOverrides(keyOverrideSettings)
if err != nil {
return err
}
return bindHandlersToKeys(g)
}
// AddHandler Adds a keybinding handler for use in Bind
func AddHandler(hnd KeyHandler) {
keyHandlers = append(keyHandlers, hnd)
}
func getKeyBindings() KeyMap {
keyBindings := KeyMap{}
for _, handler := range keyHandlers {
if override, ok := overrides[handler.ID()]; ok {
keyBindings[handler.ID()] = override
} else {
keyBindings[handler.ID()] = []interface{}{handler.DefaultKey()}
}
}
return keyBindings
}
// GetKeyBindingsAsStrings provides a map of Handler->Key in string format
func GetKeyBindingsAsStrings() map[string][]string {
keyBindings := map[string][]string{}
keys := getKeyBindings()
for k, values := range keys {
stringValues := []string{}
for _, v := range values {
if v != nil {
stringValues = append(stringValues, keyToString(v))
}
}
keyBindings[k] = stringValues
}
return keyBindings
}
func bindHandlersToKeys(g *gocui.Gui) error {
usedKeys = map[string]string{}
for _, hnd := range keyHandlers {
if err := bindHandlerToKey(g, hnd); err != nil {
return err
}
}
// panic(usedKeys)
return nil
}
func bindHandlerToKey(g *gocui.Gui, hnd KeyHandler) error {
var keys []interface{}
if k, ok := overrides[hnd.ID()]; ok {
keys = k
} else {
keys = []interface{}{hnd.DefaultKey()}
}
for _, key := range keys {
if key == nil {
continue
}
if err := checkKeyNotAlreadyInUse(hnd.Widget(), hnd.ID(), key); err != nil {
return err
}
err := g.SetKeybinding(hnd.Widget(), key, gocui.ModNone, hnd.Fn())
if err != nil {
return err
}
}
return nil
}
const reuseKeyError = "Please update your `~/.azbrowse-settings.json` file to a valid configuration and restart"
func checkKeyNotAlreadyInUse(widget, id string, key interface{}) error {
keyString := keyToString(key)
// Check key isn't already use globally
if usedBy, alreadyInUse := usedKeys[keyString]; alreadyInUse {
return errors.New("Failed when configurig `" + id + "`. The key `" + keyString + "` is already in use by `" + usedBy + "`(Global binding). " + reuseKeyError)
}
// Check key isn't already in use by a widget
if usedBy, alreadyInUse := usedKeys[widget+keyString]; alreadyInUse {
return errors.New("Failed when configurig `" + id + "`. The key `" + keyString + "` is already in use by `" + usedBy + "`. " + reuseKeyError)
}
// Track which keys are in use using a compound key of "WidgetKeyName"
// this allows a key to be used by multiple widgets but not multiple times within a widget
usedKeys[widget+keyString] = id
return nil
}
func initializeOverrides(keyOverrideSettings map[string]interface{}) error {
var err error
overrides, err = parseKeyValues(keyOverrideSettings)
if err != nil {
return err
}
return nil
}
func parseKeyValues(keyOverrideSettings map[string]interface{}) (KeyMap, error) {
keyMap := KeyMap{}
for k, v := range keyOverrideSettings {
parsedKey, err := parseKey(k)
if err != nil {
continue // ignore invalid keys
}
var values []string
switch v.(type) { //nolint: gosimple
case string:
values = []string{v.(string)}
case []interface{}:
values = []string{}
for _, item := range v.([]interface{}) {
values = append(values, item.(string))
}
}
parsedValues := []interface{}{}
for _, value := range values {
parsedValue, err := parseValue(value)
if err != nil {
continue // ignore invalid values
}
parsedValues = append(parsedValues, parsedValue)
}
keyMap[parsedKey] = parsedValues
}
return keyMap, nil
}
func parseKey(key string) (string, error) {
target := cleanKey(key)
for _, k := range keyHandlers {
if k.ID() == target {
return target, nil
}
}
return "", fmt.Errorf("%s is an unsupported key", key)
}
func parseValue(value string) (interface{}, error) {
// TODO Parse semantics properly
target := cleanValue(value)
if val, ok := StrToGocuiKey[target]; ok {
return val, nil
}
if len(target) == 1 {
// attempt as rune
return rune(target[0]), nil
}
return 0, fmt.Errorf("%s is an unsupported value", value)
}
func cleanKey(str string) string {
return strings.Replace(strings.ToLower(str), " ", "", -1)
}
func cleanValue(str string) string {
return strings.Replace(strings.ToLower(str), " ", "", -1)
}
func keyToString(key interface{}) string {
switch t := key.(type) { //nolint: gosimple
case gocui.Key:
return GocuiKeyToStr[key.(gocui.Key)]
case rune:
return string(key.(rune))
default:
panic(fmt.Sprintf("Unhandled key type: %v\n", t))
}
}