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const splitChars = str => str.split('').map(char => char.charCodeAt(0))
const simpleKeybindings = {
space: ['Space', [0x20]],
esc: ['Escape', [0x1b]],
escape: ['Escape', [0x1b]],
up: ['Up', [0x1b, ...splitChars('[A')]],
down: ['Down', [0x1b, ...splitChars('[B')]],
right: ['Right', [0x1b, ...splitChars('[C')]],
left: ['Left', [0x1b, ...splitChars('[D')]],
shiftUp: ['Shift+Up', [0x1b, ...splitChars('[1;2A')]],
shiftDown: ['Shift+Down', [0x1b, ...splitChars('[1;2B')]],
shiftRight: ['Shift+Right', [0x1b, ...splitChars('[1;2C')]],
shiftLeft: ['Shift+Left', [0x1b, ...splitChars('[1;2D')]],
delete: ['Backspace', [0x7f]],
backspace: ['Backspace', [0x7f]]
}
module.exports.compileKeybindings = function(bindings, commands) {
// The "commands" array is an optional argument - if not given, the resulting
// handler function will simply return the keybinding array for whichever
// matches the inputted keypress. Too bad this feature isn't used anywhere.
// Thanks, old me.
const handlers = bindings.map(binding => {
const [ keys, command, ...args] = binding
if (!commands.hasOwnProperty(command)) {
console.warn('Invalid command', command, 'in keybinding', binding)
return
}
let failed = false
const bufferParts = keys.map(item => {
if (typeof item === 'number') {
return [item]
} else if (simpleKeybindings.hasOwnProperty(item)) {
return simpleKeybindings[item][1]
} else if (typeof item === 'string' && item.length === 1) {
return [item.charCodeAt(0)]
} else {
console.warn(
'Invalid keybinding part', item, 'in keybinding', bindings
)
failed = true
return []
}
}).reduce((a, b) => a.concat(b), [])
if (failed) {
return
}
const buffer = Buffer.from(bufferParts)
return async function(inputData) {
if (buffer.equals(inputData)) {
if (commands) {
const result = await commands[command](...args)
return typeof result === 'undefined' ? true : result
} else {
return keybinding
}
}
}
}).filter(Boolean)
return async function(inputData) {
for (const handler of handlers) {
const result = await handler(inputData)
if (typeof result !== 'undefined') {
return result
}
}
}
}
module.exports.getComboForCommand = function(command, bindings) {
const binding = bindings.find(kb => kb[1] === command)
if (binding) {
return binding[0]
} else {
return null
}
}
module.exports.stringifyCombo = function(combo) {
const stringifiedItems = combo.map(item => {
if (typeof item === 'string') {
if (item.length === 1) {
return item.toUpperCase()
} else if (simpleKeybindings.hasOwnProperty(item)) {
return simpleKeybindings[item][0]
} else {
return item
}
} else {
return JSON.stringify(item)
}
})
return stringifiedItems.join('+')
}
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