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 1.1.12
// @description A userscript that allows you to add one or more vertical guidelines to the code
// @license MIT
// @author Rob Garrison
// @namespace https://github.com/Mottie
// @include https://github.com/*
// @run-at document-idle
// @grant GM_getValue
// @grant GM_setValue
// @grant GM_registerMenuCommand
// @icon https://github.githubassets.com/pinned-octocat.svg
// ==/UserScript==
/* copy into textarea to check the guides
1 2 3 4 5 6 7 8
1234567890123456789012345678901234567890123456789012345678901234567890123456789012345
*/
(() => {
"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"),
tabSize = GM_getValue("ghcg-tabs", 2);
function adjust(val) {
return `${val.toFixed(1)}ch`;
}
function addDefinition(start, end, color) {
return `
transparent ${start},
${color} ${start},
${color} ${end},
transparent ${end},
`;
}
function addGuides(vals) {
let css = "";
// to align the guides *after* the setting, we need to subtract 0.5, 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) - 0.5,
size = parseFloat(guide.width) || 0.2;
const color = guide.color || "rgba(0, 0, 0, .3)";
// each line needs to be at least 0.2ch in width to be visible
size = size > 0.2 ? size : 0.2;
css += addDefinition(adjust(start), adjust(start + size), color);
});
style.textContent = `
table.tab-size[data-tab-size] {
tab-size: ${tabSize};
-moz-tab-size: ${tabSize};
}
span.blob-code-inner:before,
td.blob-code-inner:not(.blob-code-hunk):before,
.blob-code-context .blob-code-inner:before,
.blob-code-addition .blob-code-inner:before,
.blob-code-deletion .blob-code-inner:before {
content: " ";
display: block;
position: absolute;
top: 0;
left: 1em;
width: 100%;
height: 100%;
}
.blob-code span.blob-code-inner {
display: block !important;
}
span.blob-code-inner,
td.blob-code-inner:not(.blob-code-hunk),
.blob-code-inner:before {
font-family: "${font}", Consolas, "Liberation Mono", Menlo, Courier, monospace !important;
}
span.blob-code-inner:before,
td.blob-code-inner:not(.blob-code-hunk):before {
background: linear-gradient(to right, transparent 0%, ${css} transparent 100%) !important;
pointer-events: none;
}
`;
}
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);
GM_setValue("ghcg-tabs", tabSize);
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);
}
});
GM_registerMenuCommand("Set code guideline tab size", () => {
const val = prompt("Enter code guideline tab size", tabSize);
if (val !== null) {
tabSize = val;
validateGuides(guides);
}
});
})();