Add NFO metadata source

server/scanner/BookScanner.js

@@ -18,6 +18,7 @@ const BookFinder = require('../finders/BookFinder')
 
 const LibraryScan = require("./LibraryScan")
 const OpfFileScanner = require('./OpfFileScanner')
+const NfoFileScanner = require('./NfoFileScanner')
 const AbsMetadataFileScanner = require('./AbsMetadataFileScanner')
 
 /**
@@ -593,7 +594,7 @@ class BookScanner {
     }
 
     const bookMetadataSourceHandler = new BookScanner.BookMetadataSourceHandler(bookMetadata, audioFiles, libraryItemData, libraryScan, existingLibraryItemId)
-    const metadataPrecedence = librarySettings.metadataPrecedence || ['folderStructure', 'audioMetatags', 'txtFiles', 'opfFile', 'absMetadata']
+    const metadataPrecedence = librarySettings.metadataPrecedence || ['folderStructure', 'audioMetatags', 'nfoFile', 'txtFiles', 'opfFile', 'absMetadata']
     libraryScan.addLog(LogLevel.DEBUG, `"${bookMetadata.title}" Getting metadata with precedence [${metadataPrecedence.join(', ')}]`)
     for (const metadataSource of metadataPrecedence) {
       if (bookMetadataSourceHandler[metadataSource]) {
@@ -649,6 +650,14 @@ class BookScanner {
       AudioFileScanner.setBookMetadataFromAudioMetaTags(bookTitle, this.audioFiles, this.bookMetadata, this.libraryScan)
     }
 
+    /**
+     * Metadata from .nfo file
+     */
+    async nfoFile() {
+      if (!this.libraryItemData.metadataNfoLibraryFile) return
+      await NfoFileScanner.scanBookNfoFile(this.libraryItemData.metadataNfoLibraryFile, this.bookMetadata)
+    }
+    
     /**
      * Description from desc.txt and narrator from reader.txt
      */

server/scanner/LibraryItemScanData.js

@@ -132,6 +132,11 @@ class LibraryItemScanData {
     return this.libraryFiles.find(lf => lf.metadata.ext.toLowerCase() === '.opf')
   }
 
+  /** @type {LibraryItem.LibraryFileObject} */
+  get metadataNfoLibraryFile() {
+    return this.libraryFiles.find(lf => lf.metadata.ext.toLowerCase() === '.nfo')
+  }
+
   /**
    * 
    * @param {LibraryItem} existingLibraryItem 

server/scanner/NfoFileScanner.js

@@ -0,0 +1,48 @@
+const { parseNfoMetadata } = require('../utils/parsers/parseNfoMetadata')
+const { readTextFile } = require('../utils/fileUtils')
+
+class NfoFileScanner {
+  constructor() { }
+
+  /**
+   * Parse metadata from .nfo file found in library scan and update bookMetadata
+   * 
+   * @param {import('../models/LibraryItem').LibraryFileObject} nfoLibraryFileObj 
+   * @param {Object} bookMetadata 
+   */
+  async scanBookNfoFile(nfoLibraryFileObj, bookMetadata) {
+    const nfoText = await readTextFile(nfoLibraryFileObj.metadata.path)
+    const nfoMetadata = nfoText ? await parseNfoMetadata(nfoText) : null
+    if (nfoMetadata) {
+      for (const key in nfoMetadata) {
+        if (key === 'tags') { // Add tags only if tags are empty
+          if (nfoMetadata.tags.length) {
+            bookMetadata.tags = nfoMetadata.tags
+          }
+        } else if (key === 'genres') { // Add genres only if genres are empty
+          if (nfoMetadata.genres.length) {
+            bookMetadata.genres = nfoMetadata.genres
+          }
+        } else if (key === 'authors') {
+          if (nfoMetadata.authors?.length) {
+            bookMetadata.authors = nfoMetadata.authors
+          }
+        } else if (key === 'narrators') {
+          if (nfoMetadata.narrators?.length) {
+            bookMetadata.narrators = nfoMetadata.narrators
+          }
+        } else if (key === 'series') {
+          if (nfoMetadata.series) {
+            bookMetadata.series = [{
+              name: nfoMetadata.series,
+              sequence: nfoMetadata.sequence || null
+            }]
+          }
+        } else if (nfoMetadata[key] && key !== 'sequence') {
+          bookMetadata[key] = nfoMetadata[key]
+        }
+      }
+    }
+  }
+}
+module.exports = new NfoFileScanner()