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`pr-size.ts`

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pr-size.tsBlame73 lines · 1 contributor

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74d8c4dClaude	1	/**
	2	* PR size analysis — computes lines-changed from a git diff and maps to
	3	* an XS/S/M/L/XL label with a matching colour. Zero DB tables; pure git
	4	* subprocess + arithmetic.
	5	*/
	6
	7	import { join } from "path";
	8
	9	export type PrSizeLabel = "XS" \| "S" \| "M" \| "L" \| "XL";
	10
	11	export interface PrSizeInfo {
	12	label: PrSizeLabel;
	13	linesChanged: number;
	14	added: number;
	15	deleted: number;
	16	color: string;
	17	bgColor: string;
	18	}
	19
	20	const SIZE_COLORS: Record<PrSizeLabel, { fg: string; bg: string }> = {
	21	XS: { fg: "#34d399", bg: "rgba(52,211,153,0.12)" },
	22	S: { fg: "#60a5fa", bg: "rgba(96,165,250,0.12)" },
	23	M: { fg: "#facc15", bg: "rgba(250,204,21,0.12)" },
	24	L: { fg: "#f97316", bg: "rgba(249,115,22,0.12)" },
	25	XL: { fg: "#f87171", bg: "rgba(248,113,113,0.12)" },
	26	};
	27
	28	export function computeSizeLabel(linesChanged: number): PrSizeLabel {
	29	if (linesChanged < 10) return "XS";
	30	if (linesChanged < 50) return "S";
	31	if (linesChanged < 200) return "M";
	32	if (linesChanged < 500) return "L";
	33	return "XL";
	34	}
	35
	36	export async function computePrSize(
	37	ownerName: string,
	38	repoName: string,
	39	baseBranch: string,
	40	headBranch: string
	41	): Promise<PrSizeInfo \| null> {
	42	try {
	43	const repoBase = process.env.GIT_REPOS_PATH \|\| "./repos";
	44	const diskPath = join(repoBase, `${ownerName}/${repoName}.git`);
	45
	46	const proc = Bun.spawn(
	47	["git", "--git-dir", diskPath, "diff", "--numstat", `${baseBranch}...${headBranch}`],
	48	{ stdout: "pipe", stderr: "pipe" }
	49	);
	50	const out = await new Response(proc.stdout).text();
	51	await proc.exited;
	52
	53	let added = 0;
	54	let deleted = 0;
	55	for (const line of out.trim().split("\n")) {
	56	if (!line) continue;
	57	const parts = line.split("\t");
	58	if (parts.length >= 2) {
	59	const a = parseInt(parts[0], 10);
	60	const d = parseInt(parts[1], 10);
	61	if (!isNaN(a)) added += a;
	62	if (!isNaN(d)) deleted += d;
	63	}
	64	}
	65
	66	const linesChanged = added + deleted;
	67	const label = computeSizeLabel(linesChanged);
	68	const { fg, bg } = SIZE_COLORS[label];
	69	return { label, linesChanged, added, deleted, color: fg, bgColor: bg };
	70	} catch {
	71	return null;
	72	}
	73	}