refactor: unify pagination helpers

src/cli/pagination.ts

@@ -0,0 +1,79 @@
+export type PaginationCmdOpts = {
+  all?: boolean;
+  maxPages?: string;
+  cursor?: string;
+  delay?: string;
+};
+
+export function parsePositiveIntFlag(
+  raw: string | undefined,
+  flagName: string,
+): { ok: true; value: number | undefined } | { ok: false; error: string } {
+  if (raw === undefined) {
+    return { ok: true, value: undefined };
+  }
+  const value = Number.parseInt(raw, 10);
+  if (!Number.isFinite(value) || value <= 0) {
+    return { ok: false, error: `Invalid ${flagName}. Expected a positive integer.` };
+  }
+  return { ok: true, value };
+}
+
+export function parseNonNegativeIntFlag(
+  raw: string | undefined,
+  flagName: string,
+  defaultValue: number,
+): { ok: true; value: number } | { ok: false; error: string } {
+  const value = Number.parseInt(raw ?? String(defaultValue), 10);
+  if (!Number.isFinite(value) || value < 0) {
+    return { ok: false, error: `Invalid ${flagName}. Expected a non-negative integer.` };
+  }
+  return { ok: true, value };
+}
+
+export function parsePaginationFlags(
+  cmdOpts: PaginationCmdOpts,
+  opts?: {
+    maxPagesImpliesPagination?: boolean;
+    defaultDelayMs?: number;
+    includeDelay?: boolean;
+  },
+):
+  | {
+      ok: true;
+      usePagination: boolean;
+      maxPages?: number;
+      cursor?: string;
+      pageDelayMs?: number;
+    }
+  | { ok: false; error: string } {
+  const maxPagesImpliesPagination = opts?.maxPagesImpliesPagination ?? false;
+  const includeDelay = opts?.includeDelay ?? false;
+  const defaultDelayMs = opts?.defaultDelayMs ?? 1000;
+
+  const maxPages = parsePositiveIntFlag(cmdOpts.maxPages, '--max-pages');
+  if (!maxPages.ok) {
+    return maxPages;
+  }
+
+  const usePagination = Boolean(
+    cmdOpts.all || cmdOpts.cursor || (maxPagesImpliesPagination && maxPages.value !== undefined),
+  );
+
+  let pageDelayMs: number | undefined;
+  if (includeDelay) {
+    const delay = parseNonNegativeIntFlag(cmdOpts.delay, '--delay', defaultDelayMs);
+    if (!delay.ok) {
+      return delay;
+    }
+    pageDelayMs = delay.value;
+  }
+
+  return {
+    ok: true,
+    usePagination,
+    maxPages: maxPages.value,
+    cursor: cmdOpts.cursor,
+    pageDelayMs,
+  };
+}