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migration.js
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migration.js
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#!/usr/bin/env node
const fs = require("fs");
const process = require("process");
const { Octokit } = require("@octokit/rest");
const globrex = require("globrex");
const Diff = require("diff");
const defaultSizes = {
0: "XS",
10: "S",
30: "M",
100: "L",
500: "XL",
};
const globrexOptions = { extended: true, globstar: true };
async function main() {
debug("Running size-label-action...");
const GITHUB_TOKEN = 'YOUR_GITHUB_TOKEN';
if (!GITHUB_TOKEN) {
throw new Error("Environment variable GITHUB_TOKEN not set!");
}
const octokit = new Octokit({
auth: `token ${GITHUB_TOKEN}`,
userAgent: "pascalgn/size-label-action"
});
let page = 1;
while (true) {
const events = await octokit.pulls.list({
owner: 'YOUR_GITHUB_USER',
repo: 'YOUR_GITHUB_REPO',
page: page++,
per_page: 100,
state: 'all',
});
if (events.data.length === 0) {
break;
}
for (const event of events.data) {
const eventData = { pull_request: event };
const isIgnored = parseIgnored(process.env.IGNORED);
const pullRequestHome = {
owner: eventData.pull_request.base.repo.owner.login,
repo: eventData.pull_request.base.repo.name
};
const pull_number = eventData.pull_request.number;
const pullRequestDiff = await octokit.pulls.get({
...pullRequestHome,
pull_number,
headers: {
accept: "application/vnd.github.v3.diff"
}
});
const changedLines = getChangedLines(isIgnored, pullRequestDiff.data);
console.log("Changed lines:", changedLines);
const sizes = getSizesInput();
const sizeLabel = getSizeLabel(changedLines, sizes);
console.log("Matching label:", sizeLabel);
const { add, remove } = getLabelChanges(
sizeLabel,
eventData.pull_request.labels
);
if (add.length === 0 && remove.length === 0) {
console.log("Correct label already assigned");
continue;
}
if (add.length > 0) {
debug("Adding labels:", add);
await octokit.issues.addLabels({
...pullRequestHome,
issue_number: pull_number,
labels: add
});
}
for (const label of remove) {
debug("Removing label:", label);
try {
await octokit.issues.removeLabel({
...pullRequestHome,
issue_number: pull_number,
name: label
});
} catch (error) {
debug("Ignoring removing label error:", error);
}
}
}
}
debug("Success!");
return true;
}
function debug(...str) {
if (process.env.DEBUG_ACTION) {
console.log.apply(console, str);
}
}
function parseIgnored(str = "") {
const ignored = str
.split(/\r|\n/)
.map(s => s.trim())
.filter(s => s.length > 0 && !s.startsWith("#"))
.map(s =>
s.length > 1 && s[0] === "!"
? { not: globrex(s.substr(1), globrexOptions) }
: globrex(s, globrexOptions)
);
function isIgnored(path) {
if (path == null || path === "/dev/null") {
return true;
}
const pathname = path.substr(2);
let ignore = false;
for (const entry of ignored) {
if (entry.not) {
if (pathname.match(entry.not.regex)) {
return false;
}
} else if (!ignore && pathname.match(entry.regex)) {
ignore = true;
}
}
return ignore;
}
return isIgnored;
}
async function readFile(path) {
return new Promise((resolve, reject) => {
fs.readFile(path, { encoding: "utf8" }, (err, data) => {
if (err) {
reject(err);
} else {
resolve(data);
}
});
});
}
function getChangedLines(isIgnored, diff) {
return Diff.parsePatch(diff)
.flatMap(file =>
isIgnored(file.oldFileName) && isIgnored(file.newFileName)
? []
: file.hunks
)
.flatMap(hunk => hunk.lines)
.filter(line => line[0] === "+" || line[0] === "-").length;
}
function getSizeLabel(changedLines, sizes = defaultSizes) {
let label = null;
for (const lines of Object.keys(sizes).sort((a, b) => a - b)) {
if (changedLines >= lines) {
label = `size:${sizes[lines]}`;
}
}
return label;
}
function getLabelChanges(newLabel, existingLabels) {
const add = [newLabel];
const remove = [];
for (const existingLabel of existingLabels) {
const { name } = existingLabel;
if (name.startsWith("size:")) {
if (name === newLabel) {
add.pop();
} else {
remove.push(name);
}
}
}
return { add, remove };
}
function getSizesInput() {
let inputSizes = process.env.INPUT_SIZES;
if (inputSizes && inputSizes.length) {
return JSON.parse(inputSizes);
} else {
return undefined;
}
}
if (require.main === module) {
main().then(
() => (process.exitCode = 0),
e => {
process.exitCode = 1;
console.error(e);
}
);
}
module.exports = { main };