Add ${var} delimiter syntax for path templates

Users can now append literal text to template variables using curly
braces: ${albumtype}s produces "Albums", "Singles", "EPs". Without
braces, $albumtypes was rejected as an unknown variable by validation.

Both syntaxes work: $albumtype (plain) and ${albumtype} (delimited).
Bracket vars are resolved first to prevent partial matching conflicts.
Validation updated for album, single, and playlist templates.

web_server.py

@@ -18498,6 +18498,25 @@ def _apply_path_template(template: str, context: dict) -> str:
                         album_artist_value = resolved
                 except Exception:
                     pass
+    # Support ${var} delimited syntax (e.g. ${albumtype}s → Albums)
+    # Must run before $var replacements to prevent partial matching
+    _bracket_map = {
+        'albumartist': album_artist_value,
+        'albumtype': clean_context.get('albumtype', 'Album'),
+        'playlist': clean_context.get('playlist_name', ''),
+        'artistletter': (clean_context.get('artist', 'U') or 'U')[0].upper(),
+        'artist': clean_context.get('artist', 'Unknown Artist'),
+        'album': clean_context.get('album', 'Unknown Album'),
+        'title': clean_context.get('title', 'Unknown Track'),
+        'track': f"{clean_context.get('track_number', 1):02d}",
+        'disc': str(clean_context.get('disc_number', 1)),
+        'discnum': str(clean_context.get('disc_number', 1)),
+        'year': str(clean_context.get('year', '')),
+        'quality': clean_context.get('quality', ''),
+    }
+    for var_name, val in _bracket_map.items():
+        result = result.replace('${' + var_name + '}', val)
+
     result = result.replace('$albumartist', album_artist_value)
     result = result.replace('$albumtype', clean_context.get('albumtype', 'Album'))
     result = result.replace('$playlist', clean_context.get('playlist_name', ''))

webui/index.html

@@ -5068,7 +5068,7 @@
                                     <input type="text" id="template-album-path"
                                         placeholder="$albumartist/$albumartist - $album/$track - $title">
                                     <small class="settings-hint">Variables: $albumartist, $artist, $artistletter, $album, $albumtype,
-                                        $title, $track, $disc (01), $discnum (1), $year, $quality (filename only)</small>
+                                        $title, $track, $disc (01), $discnum (1), $year, $quality (filename only). Use ${var} to append text: ${albumtype}s → Albums</small>
                                 </div>
 
                                 <div class="form-group">

webui/static/script.js

@@ -5703,17 +5703,19 @@ function validateFileOrganizationTemplates() {
             errors.push('Album template cannot have consecutive slashes //');
         }
         // Check for likely typos of valid variables (case-insensitive to catch $Album, $ARTIST, etc.)
-        const albumVarPattern = /\$[a-zA-Z]+/g;
+        const albumVarPattern = /\$\{([a-zA-Z]+)\}|\$([a-zA-Z]+)/g;
         const foundVars = albumPath.match(albumVarPattern) || [];
         foundVars.forEach(v => {
-            const lowerVar = v.toLowerCase();
+            // Normalize ${var} to $var for validation
+            const normalized = v.startsWith('${') ? '$' + v.slice(2, -1) : v;
+            const lowerVar = normalized.toLowerCase();
             // Check if lowercase version exists in valid vars
             const isValid = validVars.album.some(validVar => validVar.toLowerCase() === lowerVar);
             if (!isValid) {
-                errors.push(`Invalid variable "${v}" in album template. Valid: ${validVars.album.join(', ')}`);
-            } else if (v !== lowerVar && validVars.album.includes(lowerVar)) {
+                errors.push(`Invalid variable "${normalized}" in album template. Valid: ${validVars.album.join(', ')}`);
+            } else if (normalized !== lowerVar && validVars.album.includes(lowerVar)) {
                 // Variable is valid but has wrong case
-                errors.push(`Variable "${v}" should be lowercase: "${lowerVar}"`);
+                errors.push(`Variable "${normalized}" should be lowercase: "${lowerVar}"`);
             }
         });
     }
@@ -5730,15 +5732,16 @@ function validateFileOrganizationTemplates() {
         if (singlePath.includes('//')) {
             errors.push('Single template cannot have consecutive slashes //');
         }
-        const singleVarPattern = /\$[a-zA-Z]+/g;
+        const singleVarPattern = /\$\{([a-zA-Z]+)\}|\$([a-zA-Z]+)/g;
         const foundVars = singlePath.match(singleVarPattern) || [];
         foundVars.forEach(v => {
-            const lowerVar = v.toLowerCase();
+            const normalized = v.startsWith('${') ? '$' + v.slice(2, -1) : v;
+            const lowerVar = normalized.toLowerCase();
             const isValid = validVars.single.some(validVar => validVar.toLowerCase() === lowerVar);
             if (!isValid) {
-                errors.push(`Invalid variable "${v}" in single template. Valid: ${validVars.single.join(', ')}`);
-            } else if (v !== lowerVar && validVars.single.includes(lowerVar)) {
-                errors.push(`Variable "${v}" should be lowercase: "${lowerVar}"`);
+                errors.push(`Invalid variable "${normalized}" in single template. Valid: ${validVars.single.join(', ')}`);
+            } else if (normalized !== lowerVar && validVars.single.includes(lowerVar)) {
+                errors.push(`Variable "${normalized}" should be lowercase: "${lowerVar}"`);
             }
         });
     }
@@ -5757,15 +5760,16 @@ function validateFileOrganizationTemplates() {
         if (playlistPath.includes('//')) {
             errors.push('Playlist template cannot have consecutive slashes //');
         }
-        const playlistVarPattern = /\$[a-zA-Z]+/g;
+        const playlistVarPattern = /\$\{([a-zA-Z]+)\}|\$([a-zA-Z]+)/g;
         const foundVars = playlistPath.match(playlistVarPattern) || [];
         foundVars.forEach(v => {
-            const lowerVar = v.toLowerCase();
+            const normalized = v.startsWith('${') ? '$' + v.slice(2, -1) : v;
+            const lowerVar = normalized.toLowerCase();
             const isValid = validVars.playlist.some(validVar => validVar.toLowerCase() === lowerVar);
             if (!isValid) {
-                errors.push(`Invalid variable "${v}" in playlist template. Valid: ${validVars.playlist.join(', ')}`);
-            } else if (v !== lowerVar && validVars.playlist.includes(lowerVar)) {
-                errors.push(`Variable "${v}" should be lowercase: "${lowerVar}"`);
+                errors.push(`Invalid variable "${normalized}" in playlist template. Valid: ${validVars.playlist.join(', ')}`);
+            } else if (normalized !== lowerVar && validVars.playlist.includes(lowerVar)) {
+                errors.push(`Variable "${normalized}" should be lowercase: "${lowerVar}"`);
             }
         });
     }