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const splitChars = str => str.split('').map(char => char.charCodeAt(0))
const simpleKeybindings = {
space: [0x20],
esc: [0x1b], escape: [0x1b],
up: [0x1b, ...splitChars('[A')],
down: [0x1b, ...splitChars('[B')],
right: [0x1b, ...splitChars('[C')],
left: [0x1b, ...splitChars('[D')],
shiftUp: [0x1b, ...splitChars('[1;2A')],
shiftDown: [0x1b, ...splitChars('[1;2B')],
shiftRight: [0x1b, ...splitChars('[1;2C')],
shiftLeft: [0x1b, ...splitChars('[1;2D')],
delete: [0x7f]
}
module.exports.compileKeybindings = function(bindings, commands) {
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]
} else if (typeof item === 'string' && item.length === 1) {
return [item.charCodeAt(0)]
} else {
// Error
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 function(inputData) {
if (buffer.equals(inputData)) {
commands[command](...args)
}
}
}).filter(Boolean)
return function(inputData) {
for (let handler of handlers) {
handler(inputData)
}
}
}
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