#!/usr/bin/env bun

// detect-bump — crude heuristic for picking a bump level from a VERSION pair.

// Used by CI's version-gate job to re-run the util with the "same" level that

// /ship used, without needing persisted bump-intent.

//

// Input: two VERSION strings via argv: current (base) and target (branch).

// Output: a single word: major|minor|patch|micro

//

// Heuristic: compare slot-by-slot. The first slot that differs IS the level.

// If nothing differs (shouldn't happen when called by CI gate — the whole point

// is the branch bumped VERSION), default to "patch".

function detect(a: string, b: string): string {

const pa = a.trim().match(/^(\d+)\.(\d+)\.(\d+)\.(\d+)$/);

const pb = b.trim().match(/^(\d+)\.(\d+)\.(\d+)\.(\d+)$/);

if (!pa || !pb) return "patch";

const [, a1, a2, a3, a4] = pa;

const [, b1, b2, b3, b4] = pb;

if (a1 !== b1) return "major";

if (a2 !== b2) return "minor";

if (a3 !== b3) return "patch";

if (a4 !== b4) return "micro";

return "patch";

}

const [, , base, target] = process.argv;

if (!base || !target) {

console.error("Usage: detect-bump <base-version> <branch-version>");

process.exit(2);

}

console.log(detect(base, target));