Download Selected button, Various small improvements

src/electron/ipc/BatchSongDetailsHandler.ipc.ts

@@ -0,0 +1,22 @@
+import { IPCInvokeHandler } from '../shared/IPCHandler'
+import Database from '../shared/Database'
+import { VersionResult } from '../shared/interfaces/songDetails.interface'
+
+export default class BatchSongDetailsHandler implements IPCInvokeHandler<'batch-song-details'> {
+  event: 'batch-song-details' = 'batch-song-details'
+  // TODO: add method documentation
+
+  async handler(songIDs: number[]) {
+    const db = await Database.getInstance()
+
+    return db.sendQuery(this.getVersionQuery(songIDs)) as Promise<VersionResult[]>
+  }
+
+  private getVersionQuery(songIDs: number[]) {
+    return `
+      SELECT *
+      FROM VersionMetaFull
+      WHERE songID IN (${songIDs.join(',')});
+    `
+  }
+}

src/electron/shared/ElectronUtilFunctions.ts

@@ -0,0 +1,11 @@
+import InitSettingsHandler from '../ipc/InitSettingsHandler.ipc'
+import { basename } from 'path'
+
+/**
+ * @param absoluteFilepath The absolute filepath to a folder
+ * @returns The relative filepath from the scanned folder to <absoluteFilepath>
+ */
+export async function getRelativeFilepath(absoluteFilepath: string) {
+  const settings = await InitSettingsHandler.getSettings()
+  return basename(settings.libraryPath) + absoluteFilepath.substring(settings.libraryPath.length)
+}

src/electron/shared/ErrorMessages.ts

@@ -1,5 +1,5 @@
 import { red } from 'cli-color'
-import { getRelativeFilepath } from './UtilFunctions'
+import { getRelativeFilepath } from './ElectronUtilFunctions'
 
 // TODO: add better error reporting (through the UI)
 

src/electron/shared/IPCHandler.ts

@@ -7,6 +7,7 @@ import { Download, NewDownload, DownloadProgress } from './interfaces/download.i
 import { DownloadHandler } from '../ipc/download/DownloadHandler'
 import { Settings } from './Settings'
 import InitSettingsHandler from '../ipc/InitSettingsHandler.ipc'
+import BatchSongDetailsHandler from '../ipc/BatchSongDetailsHandler.ipc'
 
 /**
  * To add a new IPC listener:
@@ -21,6 +22,7 @@ export function getIPCInvokeHandlers(): IPCInvokeHandler<keyof IPCInvokeEvents>[
     new InitSettingsHandler(),
     new SearchHandler(),
     new SongDetailsHandler(),
+    new BatchSongDetailsHandler(),
     new AlbumArtHandler()
   ]
 }
@@ -42,6 +44,10 @@ export type IPCInvokeEvents = {
     input: SongResult['id']
     output: VersionResult[]
   }
+  'batch-song-details': {
+    input: number[]
+    output: VersionResult[]
+  }
 }
 
 export interface IPCInvokeHandler<E extends keyof IPCInvokeEvents> {

src/electron/shared/UtilFunctions.ts

@@ -1,16 +1,5 @@
 let sanitize = require('sanitize-filename')
 
-/**
- * @param absoluteFilepath The absolute filepath to a folder
- * @returns The relative filepath from the scanned folder to <absoluteFilepath>
- */
-export function getRelativeFilepath(absoluteFilepath: string) {
-  // TODO: figure out how these functions should use <settings> (like an async initialization script that
-  //          loads everything and connects to the database, etc...)
-  // return basename(scanSettings.songsFolderPath) + absoluteFilepath.substring(scanSettings.songsFolderPath.length)
-  return absoluteFilepath
-}
-
 /**
  * @returns A random UUID
  */
@@ -53,4 +42,23 @@ export function sanitizeFilename(filename: string): string {
  */
 export function interpolate(val: number, fromA: number, fromB: number, toA: number, toB: number) {
   return ((val - fromA) / (fromB - fromA)) * (toB - toA) + toA
+}
+
+/**
+ * Splits <objectList> into multiple arrays, grouping by matching <key> values.
+ * @param objectList A list of objects.
+ * @param key A key from the list of objects.
+ */
+export function groupBy<T>(objectList: T[], key: keyof T) {
+  const results: T[][] = []
+  for (const object of objectList) {
+    const matchingGroup = results.find(result => result[0][key] == object[key])
+    if (matchingGroup != undefined) {
+      matchingGroup.push(object)
+    } else {
+      results.push([object])
+    }
+  }
+
+  return results
 }