feat(library): add ipod-safe emoji encoding for playlist names

src/lib/library/m3u8.ts

@@ -1,5 +1,6 @@
 import { writeFile } from '@tauri-apps/plugin-fs';
 import { sanitizeFilename } from '$lib/services/deezer/paths';
+import { encodeEmojis } from '$lib/utils/emoji';
 
 export interface M3U8Track {
   duration: number; // in seconds
@@ -22,14 +23,15 @@ export async function writeM3U8(
   tracks: M3U8Track[],
   playlistsFolder: string
 ): Promise<string> {
-  // Sanitize playlist name for filename
-  const sanitizedName = sanitizeFilename(playlistName);
+  // Encode emojis and sanitize playlist name for filename
+  const encodedName = encodeEmojis(playlistName);
+  const sanitizedName = sanitizeFilename(encodedName);
   const playlistPath = `${playlistsFolder}/${sanitizedName}.m3u8`;
 
   // Build m3u8 content
   const lines: string[] = [
     '#EXTM3U',
-    `#PLAYLIST:${playlistName}`,
+    `#PLAYLIST:${encodedName}`,
     '#EXTENC:UTF-8',
     ''
   ];

src/lib/library/playlist.ts

@@ -3,6 +3,7 @@ import { invoke } from '@tauri-apps/api/core';
 import type { Track, AudioFormat, PlaylistWithTracks, TrackMetadata } from '$lib/types/track';
 import { findAlbumArt } from './album';
 import { sanitizeFilename } from '$lib/services/deezer/paths';
+import { decodeEmojis } from '$lib/utils/emoji';
 
 /**
  * Get audio format from file extension
@@ -36,6 +37,30 @@ export interface ParsedPlaylistTrack {
   };
 }
 
+/**
+ * Extract playlist name from #PLAYLIST: metadata line in m3u8 file
+ * Returns decoded emoji name, or undefined if not found
+ */
+export async function parsePlaylistName(playlistPath: string): Promise<string | undefined> {
+  try {
+    const content = await readTextFile(playlistPath);
+    const lines = content.split('\n');
+
+    for (const line of lines) {
+      const trimmed = line.trim();
+      if (trimmed.startsWith('#PLAYLIST:')) {
+        const encodedName = trimmed.substring('#PLAYLIST:'.length);
+        return decodeEmojis(encodedName);
+      }
+    }
+
+    return undefined;
+  } catch (error) {
+    console.error('Error reading playlist name:', error);
+    return undefined;
+  }
+}
+
 /**
  * Parse M3U/M3U8 playlist file
  * Supports both basic M3U and extended M3U8 format
@@ -52,7 +77,7 @@ export async function parsePlaylist(playlistPath: string): Promise<ParsedPlaylis
     for (let i = 0; i < lines.length; i++) {
       const line = lines[i];
 
-      // Skip empty lines and non-EXTINF comments
+      // Skip empty lines and comments (except EXTINF)
       if (!line || (line.startsWith('#') && !line.startsWith('#EXTINF'))) {
         continue;
       }

src/lib/library/scanner.ts

@@ -1,6 +1,7 @@
 import { readDir, readFile } from '@tauri-apps/plugin-fs';
 import { parseBuffer } from 'music-metadata';
 import type { Album, ArtistWithAlbums, AudioFormat } from '$lib/types/track';
+import { parsePlaylistName } from './playlist';
 
 export interface Artist {
   name: string;
@@ -283,11 +284,18 @@ export async function scanPlaylists(playlistsFolderPath: string): Promise<Playli
       if (!entry.isDirectory) {
         const isPlaylist = entry.name.endsWith('.m3u') || entry.name.endsWith('.m3u8');
         if (isPlaylist) {
-          // Remove extension for display name
+          const playlistPath = `${playlistsFolderPath}/${entry.name}`;
+
+          // Try to read playlist name from #PLAYLIST: metadata (with emoji decoding)
+          const metadataName = await parsePlaylistName(playlistPath);
+
+          // Fallback to filename without extension if no metadata found
           const nameWithoutExt = entry.name.replace(/\.(m3u8?|M3U8?)$/, '');
+          const displayName = metadataName || nameWithoutExt;
+
           playlists.push({
-            name: nameWithoutExt,
-            path: `${playlistsFolderPath}/${entry.name}`
+            name: displayName,
+            path: playlistPath
           });
         }
       }

src/lib/utils/emoji.ts

@@ -0,0 +1,82 @@
+/**
+ * Emoji encoding/decoding utilities for filesystem-safe names
+ * Converts emojis to [U+XXXXX] format for safe storage
+ */
+
+/**
+ * Check if a character is an emoji
+ * Emojis are in Unicode ranges:
+ * - Basic Emoticons: U+1F600 - U+1F64F
+ * - Dingbats: U+2700 - U+27BF
+ * - Miscellaneous Symbols: U+2600 - U+26FF
+ * - Transport and Map: U+1F680 - U+1F6FF
+ * - Supplemental Symbols: U+1F900 - U+1F9FF
+ * - Flags: U+1F1E6 - U+1F1FF
+ * - And many more...
+ */
+function isEmoji(codePoint: number): boolean {
+  return (
+    (codePoint >= 0x1F600 && codePoint <= 0x1F64F) || // Emoticons
+    (codePoint >= 0x1F300 && codePoint <= 0x1F5FF) || // Misc Symbols and Pictographs
+    (codePoint >= 0x1F680 && codePoint <= 0x1F6FF) || // Transport and Map
+    (codePoint >= 0x1F900 && codePoint <= 0x1F9FF) || // Supplemental Symbols
+    (codePoint >= 0x1F1E6 && codePoint <= 0x1F1FF) || // Flags
+    (codePoint >= 0x2600 && codePoint <= 0x26FF) ||   // Misc symbols
+    (codePoint >= 0x2700 && codePoint <= 0x27BF) ||   // Dingbats
+    (codePoint >= 0xFE00 && codePoint <= 0xFE0F) ||   // Variation Selectors
+    (codePoint >= 0x1F000 && codePoint <= 0x1F02F) || // Mahjong Tiles
+    (codePoint >= 0x1F0A0 && codePoint <= 0x1F0FF) || // Playing Cards
+    (codePoint >= 0x1FA70 && codePoint <= 0x1FAFF) || // Symbols and Pictographs Extended-A
+    (codePoint >= 0x200D) ||                          // Zero Width Joiner (used in emoji sequences)
+    (codePoint >= 0x231A && codePoint <= 0x231B) ||   // Watch, Hourglass
+    (codePoint >= 0x23E9 && codePoint <= 0x23F3) ||   // Media controls
+    (codePoint >= 0x25AA && codePoint <= 0x25AB) ||   // Geometric shapes
+    (codePoint >= 0x25B6) ||                          // Play button
+    (codePoint >= 0x2934 && codePoint <= 0x2935) ||   // Arrows
+    (codePoint >= 0x2B05 && codePoint <= 0x2B07) ||   // Arrows
+    (codePoint >= 0x3030) ||                          // Wavy dash
+    (codePoint >= 0x303D) ||                          // Part alternation mark
+    (codePoint >= 0x3297) ||                          // Japanese symbols
+    (codePoint >= 0x3299)                             // Japanese symbols
+  );
+}
+
+/**
+ * Encode emojis in text to [U+XXXXX] format
+ * Example: "hello 👀" → "hello [U+1F440]"
+ */
+export function encodeEmojis(text: string): string {
+  let result = '';
+
+  // Iterate through Unicode code points (not just chars, to handle surrogate pairs)
+  for (const char of text) {
+    const codePoint = char.codePointAt(0);
+
+    if (codePoint !== undefined && isEmoji(codePoint)) {
+      // Convert to hex string with uppercase
+      const hex = codePoint.toString(16).toUpperCase();
+      result += `[U+${hex}]`;
+    } else {
+      result += char;
+    }
+  }
+
+  return result;
+}
+
+/**
+ * Decode [U+XXXXX] format back to emojis
+ * Example: "hello [U+1F440]" → "hello 👀"
+ */
+export function decodeEmojis(text: string): string {
+  // Match [U+XXXXX] patterns (hex can be 4-6 digits for Unicode)
+  return text.replace(/\[U\+([0-9A-Fa-f]+)\]/g, (match, hex) => {
+    try {
+      const codePoint = parseInt(hex, 16);
+      return String.fromCodePoint(codePoint);
+    } catch {
+      // If parsing fails, return the original match
+      return match;
+    }
+  });
+}