A userscript that allows you to add one or more vertical guidelines to the code
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// ==UserScript==
// @name GitHub Code Guides
// @version 1.0.0
// @description A userscript that allows you to add one or more vertical guidelines to the code
// @license https://creativecommons.org/licenses/by-sa/4.0/
// @namespace http://github.com/Mottie
// @include https://github.com/*
// @grant GM_getValue
// @grant GM_setValue
// @grant GM_registerMenuCommand
// @run-at document-idle
// @author Rob Garrison
// ==/UserScript==
/* copy into textarea to check the guides
1 2 3 4 5 6 7 8
1234567890123456789012345678901234567890123456789012345678901234567890123456789012345
*/
/* global document, prompt, GM_getValue, GM_setValue, GM_registerMenuCommand */
/* jshint esnext:true, unused:true */
(() => {
'use strict';
const style = document.createElement('style');
// eslint-disable-next-line one-var
let guides = GM_getValue('ghcg-guides', [{
chars: 80,
color: 'rgba(0, 0, 0, .3)',
width: 0.2
}]),
font = GM_getValue('ghcg-font', 'Menlo');
function addGuides(vals) {
let css = '';
// to align the guides *after* the setting, we need to add 1, then add
// another 0.1 to give the guide a tiny bit of white space to the left
vals.forEach(guide => {
let start = parseFloat(guide.chars) + 1.1;
// eslint-disable-next-line one-var
const size = parseFloat(guide.width) || 0.2,
// each line needs to be at least 0.2ch in width to be visible
end = (start + (size > 0.2 ? size : 0.2)).toFixed(1),
color = guide.color || 'rgba(0, 0, 0, .3)';
start = start.toFixed(1);
css += `transparent ${start}ch, ${color} ${start}ch, ${color} ${end}ch, transparent ${end}ch, `;
});
style.textContent = `
textarea, span.blob-code-inner {
font-family: "${font}", Consolas, "Liberation Mono", Menlo, Courier, monospace !important;
}
span.blob-code-inner, td.blob-code-inner, textarea[name='comment[body]'] {
display: block !important;
background: linear-gradient(to right, transparent 0%, ${css} transparent 100%) !important;
}
`;
}
function validateGuides(vals) {
let last = 0;
const valid = [];
if (!Array.isArray(vals)) {
console.log('Code-Guides Userscript: Invalid guidelines', vals);
return;
}
// Object.keys() creates an array of string values
const lines = vals.sort((a, b) => parseFloat(a.chars) - parseFloat(b.chars));
lines.forEach(line => {
const num = parseFloat(line.chars);
// 0.2 is the width of the 'ch' in CSS to make it visible
if (num >= last + line.width) {
valid.push(line);
last = num;
}
});
if (valid.length) {
guides = valid;
GM_setValue('ghcg-guides', valid);
GM_setValue('ghcg-font', font);
addGuides(valid);
}
}
document.querySelector('head').appendChild(style);
validateGuides(guides);
// Add GM options
GM_registerMenuCommand('Set code guideline position & color', () => {
let val = prompt(`Enter valid JSON [{ "chars":80, "color":"#f00", "width":0.2 }, ...}`, JSON.stringify(guides));
if (val !== null) {
try {
val = JSON.parse(val);
validateGuides(val);
} catch (err) {
console.log(err);
}
}
});
GM_registerMenuCommand('Set code guideline default font', () => {
const val = prompt('Enter code font (monospaced)', font);
if (val !== null) {
font = val;
validateGuides(guides);
}
});
})();