(core) Add TSV and DSV import/export

Summary: Adds support for importing .dsv files (an April Fools 2024 easter egg), and options for exporting .dsv and .tsv files from the Share menu.

Test Plan: Browser and server tests.

Reviewers: jarek

Reviewed By: jarek

Differential Revision: https://phab.getgrist.com/D4210

app/common/ActiveDocAPI.ts

@@ -92,8 +92,13 @@ export interface TransformColumn {
   widgetOptions: string;
 }
 
+export interface ImportParseOptions extends ParseOptions {
+  delimiter?: string;
+  encoding?: string;
+}
+
 export interface ImportResult {
-  options: ParseOptions;
+  options: ImportParseOptions;
   tables: ImportTableResult[];
 }
 
@@ -106,7 +111,7 @@ export interface ImportTableResult {
 }
 
 export interface ImportOptions {
-  parseOptions?: ParseOptions;         // Options for parsing the source file.
+  parseOptions?: ImportParseOptions;   // Options for parsing the source file.
   mergeOptionMaps?: MergeOptionsMap[]; // Options for merging fields, indexed by uploadFileIndex.
 }
 
@@ -328,7 +333,7 @@ export interface ActiveDocAPI {
    * Imports files, removes previously created temporary hidden tables and creates the new ones.
    */
   importFiles(dataSource: DataSourceTransformed,
-              parseOptions: ParseOptions, prevTableIds: string[]): Promise<ImportResult>;
+              parseOptions: ImportParseOptions, prevTableIds: string[]): Promise<ImportResult>;
 
   /**
    * Finishes import files, creates the new tables, and cleans up temporary hidden tables and uploads.

app/common/UserAPI.ts

@@ -470,6 +470,8 @@ export interface DocAPI {
   getDownloadUrl(options: {template: boolean, removeHistory: boolean}): string;
   getDownloadXlsxUrl(params?: DownloadDocParams): string;
   getDownloadCsvUrl(params: DownloadDocParams): string;
+  getDownloadTsvUrl(params: DownloadDocParams): string;
+  getDownloadDsvUrl(params: DownloadDocParams): string;
   getDownloadTableSchemaUrl(params: DownloadDocParams): string;
   /**
    * Exports current document to the Google Drive as a spreadsheet file. To invoke this method, first
@@ -1057,6 +1059,14 @@ export class DocAPIImpl extends BaseAPI implements DocAPI {
     return this._url + '/download/csv?' + encodeQueryParams({...params});
   }
 
+  public getDownloadTsvUrl(params: DownloadDocParams) {
+    return this._url + '/download/tsv?' + encodeQueryParams({...params});
+  }
+
+  public getDownloadDsvUrl(params: DownloadDocParams) {
+    return this._url + '/download/dsv?' + encodeQueryParams({...params});
+  }
+
   public getDownloadTableSchemaUrl(params: DownloadDocParams) {
     // We spread `params` to work around TypeScript being overly cautious.
     return this._url + '/download/table-schema?' + encodeQueryParams({...params});