obsidian-excalidraw-plugin/src/Utils.ts

import { normalizePath, TFolder } from "obsidian";

/**
 * Splits a full path including a folderpath and a filename into separate folderpath and filename components
 * @param filepath 
 */
export function splitFolderAndFilename(filepath: string):{folderpath: string, filename: string} {
  let folderpath: string, filename:string;
  const lastIndex = filepath.lastIndexOf("/");
  return {
    folderpath: normalizePath(filepath.substr(0,lastIndex)), 
    filename: lastIndex==-1 ? filepath : filepath.substr(lastIndex+1),
  };
}

/**
 * Download data as file from Obsidian, to store on local device
 * @param encoding 
 * @param data 
 * @param filename 
 */
export function download(encoding:string,data:any,filename:string) {
  let element = document.createElement('a');
  element.setAttribute('href', (encoding ? encoding + ',' : '') + data);
  element.setAttribute('download', filename);
  element.style.display = 'none';
  document.body.appendChild(element);
  element.click();
  document.body.removeChild(element);
}

/**
 * Generates the image filename based on the excalidraw filename
 * @param excalidrawPath - Full filepath of ExclidrawFile
 * @param newExtension - extension of IMG file in ".extension" format
 * @returns 
 */
export function getIMGPathFromExcalidrawFile (excalidrawPath:string,newExtension:string):string {
  const isLegacyFile:boolean = excalidrawPath.endsWith(".excalidraw");
  const replaceExtension:string = isLegacyFile ? ".excalidraw" : ".md";
  return excalidrawPath.substring(0,excalidrawPath.lastIndexOf(replaceExtension)) + newExtension;   
}