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import {$} from 'select-dom';
export type PrReference = {
/** @example fregante/mem:main */
absolute: string;
/** @example "main" on same-repo PRs, "fregante:main" on cross-repo PRs */
relative: string;
/** @example fregante */
owner: string;
/** @example mem */
name: string;
/** @example main */
branch: string;
/** @example fregante:mem */
nameWithOwner: string;
};
const absoluteReferenceRegex = /^(?<nameWithOwner>(?<owner>[^:]+)\/(?<name>[^:]+)):(?<branch>.+)$/;
/**
* @param absolute - The full reference, e.g. `fregante/mem:main`
* @param relative - The references it appear to the user in the PR, e.g. "main" on same-repo PRs, "fregante:main" on cross-repo PRs
* @example parseReferenceRaw('fregante/mem:main', 'main')
*/
export function parseReferenceRaw(absolute: string, relative: string): PrReference {
const absoluteMatch = absoluteReferenceRegex.exec(absolute);
if (!absoluteMatch) {
throw new TypeError(`Expected \`absolute\` to be "user/repo:branch", got "${absolute}"`);
}
const {owner, name, nameWithOwner, branch} = absoluteMatch.groups!;
// We must receive the relative reference because it also tells whether it's a cross-repo PR
const expectedRelative = [branch, `${owner}:${branch}`];
if (!expectedRelative.includes(relative)) {
throw new TypeError(`Expected \`relative\` to be either "${expectedRelative.join('" or "')}", got "${relative}"`);
}
return {
owner,
name,
branch,
nameWithOwner,
absolute,
relative,
};
}
function parseReference(referenceElement: HTMLElement): PrReference {
const {title, textContent} = referenceElement;
return parseReferenceRaw(title, textContent.trim());
}
export function getBranches(): {base: PrReference; head: PrReference} {
return {
get base() {
return parseReference($('.base-ref')!);
},
get head() {
return parseReference($('.head-ref')!);
},
};
}
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