[Init] Initial commit - NetMesh terminal manager

domain/sftpTypeahead.ts

@@ -0,0 +1,45 @@
+export interface SftpTypeaheadState {
+  query: string;
+  lastInputAt: number;
+}
+
+export interface SftpTypeaheadResult {
+  state: SftpTypeaheadState;
+  matchIndex: number;
+}
+
+export type SftpViewMode = 'list' | 'tree';
+
+interface SftpTypeaheadTreeItem {
+  name: string;
+  path: string;
+}
+
+export type SftpTypeaheadSource =
+  | { kind: 'list'; names: string[] }
+  | { kind: 'tree'; names: string[]; items: SftpTypeaheadTreeItem[] };
+
+const SFTP_TYPEAHEAD_RESET_MS = 1000;
+
+export const resolveSftpTypeaheadSource = (
+  viewMode: SftpViewMode,
+  listItems: string[],
+  treeItems: SftpTypeaheadTreeItem[],
+): SftpTypeaheadSource => viewMode === 'list'
+  ? { kind: 'list', names: listItems }
+  : { kind: 'tree', names: treeItems.map((item) => item.name), items: treeItems };
+
+export const advanceSftpTypeahead = (
+  names: string[],
+  previous: SftpTypeaheadState | null,
+  key: string,
+  now: number,
+): SftpTypeaheadResult => {
+  const continuesPrevious = previous && now - previous.lastInputAt <= SFTP_TYPEAHEAD_RESET_MS;
+  const query = `${continuesPrevious ? previous.query : ''}${key}`.toLocaleLowerCase();
+
+  return {
+    state: { query, lastInputAt: now },
+    matchIndex: names.findIndex((name) => name.toLocaleLowerCase().startsWith(query)),
+  };
+};