feat: lodge server, client and admin

frontend/src/lib/lodge.ts

@@ -0,0 +1,136 @@
+import { api } from "$lib/api/client";
+
+export interface Change {
+  base: string;
+  hash: string;
+  path: string;
+  space: string;
+}
+
+export interface Revision {
+  changes: Change[];
+  machine: string;
+  main_branch: string;
+  main_sha: string;
+  seq: number;
+  time: number;
+}
+
+export interface Repo {
+  key: string;
+  name: string;
+  seq: number;
+  time: number;
+}
+
+export interface Machine {
+  created_at: number;
+  id: number;
+  last_push: number;
+  name: string;
+  revisions: number;
+}
+
+export interface FileEntry {
+  hash: string;
+  time: number;
+}
+
+export interface RepoState {
+  seq: number;
+  spaces: Record<string, Record<string, FileEntry>>;
+}
+
+export interface Code {
+  code: string;
+  command: string;
+  expires_at: number;
+}
+
+export const SHARED = "shared";
+const PATTERNS = 7;
+const WEB = "web";
+const REVOKED = "revoked";
+const SHORT_SHA = 7;
+const BRANCH_PREFIX = "branch:";
+
+export const lithology = (machine: string, machines: string[]): string => {
+  if (machine === WEB) {
+    return "lith lith-web";
+  }
+  const index = machines.indexOf(machine);
+  if (machine === REVOKED || index < 0) {
+    return "lith lith-gone";
+  }
+  return `lith lith-${index % PATTERNS}`;
+};
+
+export const shortSha = (sha: string): string =>
+  sha ? sha.slice(0, SHORT_SHA) : "no commit";
+
+export const spaceName = (space: string): string =>
+  space.startsWith(BRANCH_PREFIX) ? space.slice(BRANCH_PREFIX.length) : space;
+
+export const fileId = (space: string, path: string): string =>
+  `${space}\n${path}`;
+
+export const changeKind = (
+  change: Change
+): "added" | "deleted" | "modified" => {
+  if (!change.base) {
+    return "added";
+  }
+  return change.hash ? "modified" : "deleted";
+};
+
+const UNITS: [Intl.RelativeTimeFormatUnit, number][] = [
+  ["year", 31_536_000_000],
+  ["month", 2_592_000_000],
+  ["day", 86_400_000],
+  ["hour", 3_600_000],
+  ["minute", 60_000],
+];
+const relative = new Intl.RelativeTimeFormat("en", { numeric: "auto" });
+const absolute = new Intl.DateTimeFormat("en-GB", {
+  dateStyle: "medium",
+  timeStyle: "short",
+});
+
+export const ago = (time: number): string => {
+  if (!time) {
+    return "never";
+  }
+  const delta = time - Date.now();
+  for (const [unit, size] of UNITS) {
+    if (Math.abs(delta) >= size) {
+      return relative.format(Math.round(delta / size), unit);
+    }
+  }
+  return "just now";
+};
+
+export const exact = (time: number): string => absolute.format(time);
+
+const blobs = new Map<string, Promise<Uint8Array>>();
+
+export const blob = (hash: string): Promise<Uint8Array> => {
+  let pending = blobs.get(hash);
+  if (!pending) {
+    pending = api.bytes(`/blobs/${hash}`);
+    blobs.set(hash, pending);
+  }
+  return pending;
+};
+
+const decoder = new TextDecoder("utf-8", { fatal: true });
+
+export const text = (bytes: Uint8Array): string | null => {
+  if (bytes.includes(0)) {
+    return null;
+  }
+  try {
+    return decoder.decode(bytes);
+  } catch {
+    return null;
+  }
+};