queries.ts

1import type { Database } from "bun:sqlite";2import { inflateSync } from "node:zlib";3import type { ReleaseRecord } from "../bucket/repo.ts";4import { mirrorState } from "./store.ts";56export type Save = {7	id: string;8	parent: string;9	message: string;10	created_at: number;11	machine: string;12	agent: string;13	session: string;14	is_checkpoint: boolean;15};1617export type FileEntry = { path: string; hash: string; executable: boolean; size: number };1819/** The saves that touched each path up to one save, oldest first; `line` is every one of them in line order. */20export type Touches = { line: Save[]; byPath: Map<string, Save[]> };2122export type RepoStats = { saves: number; lines: number; language: string; updated: number | null };2324const SAVE_COLUMNS = `id, COALESCE(parent, '') AS parent, message, created_at, machine,25	COALESCE(agent, '') AS agent, COALESCE(session, '') AS session, is_checkpoint = 1 AS is_checkpoint`;26const LINE_COLUMNS =27	"line.id, line.parent, line.message, line.created_at, line.machine, line.agent, line.session, line.is_checkpoint, line.n";28const ID_PREFIX = /^[0-9a-f]{6,12}$/;2930// Checkpoints are working marks, not history (§21.4): every list and count below leaves them out.31const NOT_CHECKPOINT = "is_checkpoint = 0";3233export function headId(db: Database): string | null {34	return mirrorState(db, "head");35}3637/** A page of saves, newest first. Rows land oldest first, so rowid is the order of the line. */38export function history(db: Database, limit: number, offset: number): Save[] {39	return db40		.query<Save, [number, number]>(41			`SELECT ${SAVE_COLUMNS} FROM saves WHERE ${NOT_CHECKPOINT} ORDER BY rowid DESC LIMIT ? OFFSET ?`,42		)43		.all(limit, offset)44		.map(asSave);45}4647/** Every save, oldest first, for the timeline. */48export function timeline(db: Database): Save[] {49	return db50		.query<Save, []>(`SELECT ${SAVE_COLUMNS} FROM saves WHERE ${NOT_CHECKPOINT} ORDER BY rowid`)51		.all()52		.map(asSave);53}5455/** The save a unique prefix of 6–12 hex characters names (§6.1), or null when none or several do. */56export function saveByPrefix(db: Database, prefix: string): Save | null {57	if (!ID_PREFIX.test(prefix)) return null;58	const rows = db59		.query<Save, [string]>(`SELECT ${SAVE_COLUMNS} FROM saves WHERE id LIKE ? || '%' LIMIT 2`)60		.all(prefix);61	return rows.length === 1 ? asSave(rows[0] as Save) : null;62}6364/** The nearest ancestor that is not a checkpoint: the parent a visitor can see (§21.4). */65export function visibleParent(db: Database, save: Save): Save | null {66	for (let id = save.parent; id !== ""; ) {67		const parent = saveByPrefix(db, id);68		if (!parent?.is_checkpoint) return parent;69		id = parent.parent;70	}71	return null;72}7374/** The reason a save is flagged, or null when it isn't: its newest flag or clear event wins (§10.1). */75export function flagReason(db: Database, saveId: string): string | null {76	const row = db77		.query<{ kind: string; reason: string }, [string]>(78			`SELECT kind, COALESCE(reason, '') AS reason FROM events79			WHERE save_id = ? AND kind IN ('flag', 'clear') ORDER BY created_at DESC, id DESC LIMIT 1`,80		)81		.get(saveId);82	return row?.kind === "flag" ? row.reason : null;83}8485/** How many strip events have landed: events are append-only, so this only ever grows. */86export function stripCount(db: Database): number {87	return db.query<{ n: number }, []>("SELECT COUNT(*) AS n FROM events WHERE kind = 'strip'").get()88		?.n as number;89}9091export function filesAt(db: Database, saveId: string): FileEntry[] {92	return db93		.query<FileEntry, [string]>(94			`SELECT f.path, f.hash, f.executable = 1 AS executable, o.size FROM save_files f95			JOIN objects o ON o.hash = f.hash WHERE f.save_id = ? ORDER BY f.path`,96		)97		.all(saveId)98		.map((file) => ({ ...file, executable: Boolean(file.executable) }));99}100101export function fileAt(db: Database, saveId: string, path: string): FileEntry | null {102	const file = db103		.query<FileEntry, [string, string]>(104			`SELECT f.path, f.hash, f.executable = 1 AS executable, o.size FROM save_files f105			JOIN objects o ON o.hash = f.hash WHERE f.save_id = ? AND f.path = ?`,106		)107		.get(saveId, path);108	return file ? { ...file, executable: Boolean(file.executable) } : null;109}110111export function objectBytes(db: Database, hash: string): Uint8Array<ArrayBuffer> | null {112	const row = db113		.query<{ data: Uint8Array }, [string]>("SELECT data FROM objects WHERE hash = ?")114		.get(hash);115	return row ? new Uint8Array(inflateSync(row.data)) : null;116}117118export function repoStats(db: Database): RepoStats {119	const row = db120		.query<{ saves: number; updated: number | null }, []>(121			`SELECT COUNT(*) AS saves, MAX(created_at) AS updated FROM saves WHERE ${NOT_CHECKPOINT}`,122		)123		.get() ?? { saves: 0, updated: null };124	return {125		saves: row.saves,126		updated: row.updated,127		lines: Number(mirrorState(db, "lines") ?? 0),128		language: mirrorState(db, "language") ?? "",129	};130}131132/**133 * Which saves touched each path on the line up to `saveId` (§21.5's detail panel). A save touched a path when134 * the path was added, changed or removed against the save before it; checkpoints are skipped, so a135 * change first recorded by a checkpoint counts at the next real save.136 */137export function fileTouches(db: Database, saveId: string): Touches {138	const rows = db139		.query<Save & { path: string; n: number }, { at: string }>(140			`WITH line AS (141				SELECT ${SAVE_COLUMNS}, LAG(id) OVER (ORDER BY rowid) AS prev, rowid AS n FROM saves142				WHERE ${NOT_CHECKPOINT} AND rowid <= (SELECT rowid FROM saves WHERE id = $at)143			)144			SELECT ${LINE_COLUMNS}, f.path FROM line JOIN save_files f ON f.save_id = line.id145			LEFT JOIN save_files p ON p.save_id = line.prev AND p.path = f.path146			WHERE p.hash IS NOT f.hash OR p.executable IS NOT f.executable147			UNION ALL148			SELECT ${LINE_COLUMNS}, p.path FROM line JOIN save_files p ON p.save_id = line.prev149			WHERE NOT EXISTS (SELECT 1 FROM save_files f WHERE f.save_id = line.id AND f.path = p.path)150			ORDER BY n`,151		)152		.all({ at: saveId });153	const saves = new Map<string, Save>();154	const byPath = new Map<string, Save[]>();155	for (const { path, n: _, ...row } of rows) {156		const save = saves.get(row.id) ?? asSave(row);157		saves.set(save.id, save);158		const touched = byPath.get(path);159		if (touched) touched.push(save);160		else byPath.set(path, [save]);161	}162	return { line: [...saves.values()], byPath };163}164165/** Lines per language at the newest real save, most first, vendored code left out as in the header's language. */166export function languageLines(db: Database): [string, number][] {167	return JSON.parse(mirrorState(db, "languages") ?? "[]") as [string, number][];168}169170/** Every distinct object (unique file contents) a real save refers to, at any point in history. */171export function objectHashes(db: Database): string[] {172	return db173		.query<{ hash: string }, []>(174			`SELECT DISTINCT f.hash FROM save_files f JOIN saves s ON s.id = f.save_id WHERE s.${NOT_CHECKPOINT}`,175		)176		.all()177		.map((row) => row.hash);178}179180/** Every release record the bucket holds, in no particular order. */181export function releaseRecords(db: Database): ReleaseRecord[] {182	return db183		.query<{ record: string }, []>("SELECT record FROM releases")184		.all()185		.map((row) => JSON.parse(row.record) as ReleaseRecord);186}187188function asSave(row: Save): Save {189	return { ...row, is_checkpoint: Boolean(row.is_checkpoint) };190}