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Monospace Character Example
Author: batorboy4vw
Description Source Code Launch Bot Current Users
/*
 * Transpose the letters and numbers into characters from the Monospace
 * Mathematical set of characters (0x1D400 - 0x1D7FF). There are full-width
 * monospaced characters in the 0xFF00-0xFFEF block, but those do not look
 * very nice.  Even though the monospace math set does not include any
 * punctuation, they end up looking much better (in my opinion).
 */

const zero = 48 //'0'.charCodeAt(0)
const nine = 57 //'9'.charCodeAt(0)
const A = 65 //'A'.charCodeAt(0)
const Z = 90 //'Z'.charCodeAt(0)
const a = 97 //'a'.charCodeAt(0)
const z = 122 //'z'.charCodeAt(0)

// Starting offsets for the Monospace Mathematical characters 0x1D400 - 0x1D7FF
const MONO_A = 120432;  // Start of uppercase A-Z
const MONO_a = 120458;  // Start of lowercase a-z
const MONO_0 = 120802;  // Start of digits 0-9

const space = '\u{2007}'  //  non-breaking "figure space" (the width of the digits 0-9)
const tab = space.repeat(4)

function transpose(code) {
    if (zero <= code && code <= nine) {
        return String.fromCodePoint(MONO_0 + code - zero)
    }
    if (A <= code && code <= Z) {
        return String.fromCodePoint(MONO_A + code - A)
    }
    if (a <= code && code <= z) {
        return String.fromCodePoint(MONO_a + code - a)
    }
    // Return space characters with non-breaking spaces
    if (code === 32) return space
    // Return anything else we don't recognize as is.
    return String.fromCodePoint(code)
}

function monospace(s) {
    let result = ''
    for (let i = 0; i < s.length; ++i) {
        result += transpose(s.charCodeAt(i))
    }
    return result
}

let convert = false

cb.onMessage(function(message) {
    let msg = message['m']
    if (msg == '/on') {
        message['X-Spam'] = true
        convert = true
        cb.sendNotice(monospace('Monospaced font enabled.'))
        return message
    }
    if (msg == '/off') {
        message['X-Spam'] = true
        convert = false
        cb.sendNotice('Monospace font disabled.')
        return message
    }
    if (convert) {
        message.m = monospace(message.m)
    }
    return message
})