Move to TypeScript (#1750)

1 files changed, 69 insertions, 0 deletions

diff --git a/source/libs/utils.ts b/source/libs/utils.ts
new file mode 100644
index 00000000..421d9f66
--- /dev/null
+++ b/source/libs/utils.ts
@@ -0,0 +1,69 @@
+import select from 'select-dom';
+import onetime from 'onetime';
+import {isRepo, isPR, isIssue} from './page-detect';
+
+export const getUsername = onetime(() => select('meta[name="user-login"]').getAttribute('content'));
+
+export const getDiscussionNumber = () => (isPR() || isIssue()) && getCleanPathname().split('/')[3];
+
+// Drops leading and trailing slash to avoid /\/?/ everywhere
+export const getCleanPathname = () => location.pathname.replace(/^[/]|[/]$/g, '');
+
+// Parses a repo's subpage, e.g.
+// '/user/repo/issues/' -> 'issues'
+// '/user/repo/' -> ''
+// returns undefined if the path is not a repo
+export const getRepoPath = () => {
+	if (isRepo()) {
+		return getCleanPathname().split('/').slice(2).join('/');
+	}
+
+	return undefined;
+};
+
+export const getRepoBranch = () => {
+	const [type, branch] = getCleanPathname().split('/').slice(2);
+	if (isRepo() && type === 'tree') {
+		return branch;
+	}
+
+	return false;
+};
+
+export const getRepoURL = () => location.pathname.slice(1).split('/', 2).join('/');
+
+export const getOwnerAndRepo = () => {
+	const [, ownerName, repoName] = location.pathname.split('/', 3);
+	return {ownerName, repoName};
+};
+
+export const groupBy = (iterable, grouper) => {
+	const map = {};
+	for (const item of iterable) {
+		const key = grouper(item);
+		map[key] = map[key] || [];
+		map[key].push(item);
+	}
+
+	return map;
+};
+
+// Concats arrays but does so like a zipper instead of appending them
+// [[0, 1, 2], [0, 1]] => [0, 0, 1, 1, 2]
+// Like lodash.zip
+export const flatZip = (table, limit = Infinity) => {
+	const maxColumns = Math.max(...table.map(row => row.length));
+	const zipped = [];
+	for (let col = 0; col < maxColumns; col++) {
+		for (const row of table) {
+			if (row[col]) {
+				zipped.push(row[col]);
+				if (zipped.length === limit) {
+					return zipped;
+				}
+			}
+		}
+	}
+
+	return zipped;
+};