add the notion of noteWatchFolder for auto sync

src/main.ts

@@ -212,11 +212,24 @@ class VaultWriter {
 	async writeMarkdownFile(file: TFile, sn: SupernoteX, imgs: TFile[] | null, overwrite = false) {
 		let content = '';
 
-		// Derive the output path. When a mirror folder is configured, replicate the
-		// note's relative path under that folder; otherwise save alongside the note.
+		// Derive the output path. The mirror folder applies only when the file is
+		// inside the watched folder (or no watched folder is set). Files outside the
+		// watched folder always save alongside the note. When both are set, the
+		// watched folder prefix is stripped from the mirror path to avoid duplication.
 		const relMdPath = file.path.replace(/\.note$/i, '.md');
 		const mirrorFolder = this.settings.markdownMirrorFolder;
-		const baseFilename = mirrorFolder ? `${mirrorFolder}/${relMdPath}` : relMdPath;
+		const watchFolder = this.settings.noteWatchFolder.replace(/\/$/, '');
+		let baseFilename: string;
+		if (mirrorFolder && (!watchFolder || file.path.startsWith(watchFolder + '/'))) {
+			let mirrorRelPath = relMdPath;
+			if (watchFolder) {
+				const prefix = watchFolder + '/';
+				if (mirrorRelPath.startsWith(prefix)) mirrorRelPath = mirrorRelPath.slice(prefix.length);
+			}
+			baseFilename = `${mirrorFolder}/${mirrorRelPath}`;
+		} else {
+			baseFilename = relMdPath;
+		}
 		const dir = baseFilename.slice(0, baseFilename.length - `${file.basename}.md`.length);
 		let filename = baseFilename;
 
@@ -755,6 +768,8 @@ export default class SupernotePlugin extends Plugin {
 			this.app.vault.on('create', (file) => {
 				if (!this.settings.isAutoSyncMarkdownEnabled) return;
 				if (!(file instanceof TFile) || file.extension !== 'note') return;
+				const wf = this.settings.noteWatchFolder.replace(/\/$/, '');
+				if (wf && !file.path.startsWith(wf + '/')) return;
 				vw.attachMarkdownFile(file, true).catch(e => console.error('Supernote auto-sync (create) error:', e));
 			})
 		);
@@ -763,6 +778,8 @@ export default class SupernotePlugin extends Plugin {
 			this.app.vault.on('modify', (file) => {
 				if (!this.settings.isAutoSyncMarkdownEnabled) return;
 				if (!(file instanceof TFile) || file.extension !== 'note') return;
+				const wf = this.settings.noteWatchFolder.replace(/\/$/, '');
+				if (wf && !file.path.startsWith(wf + '/')) return;
 				const existing = syncDebounceMap.get(file.path);
 				if (existing) clearTimeout(existing);
 				syncDebounceMap.set(file.path, setTimeout(() => {

src/settings.ts

@@ -16,6 +16,7 @@ export interface SupernotePluginSettings extends CustomDictionarySettings {
     isKeywordsAndLinksEnabled: boolean;
     isHashtagsMentionsEnabled: boolean;
     markdownMirrorFolder: string;
+    noteWatchFolder: string;
 }
 
 export const DEFAULT_SETTINGS: SupernotePluginSettings = {
@@ -29,6 +30,7 @@ export const DEFAULT_SETTINGS: SupernotePluginSettings = {
     isKeywordsAndLinksEnabled: true,
     isHashtagsMentionsEnabled: true,
     markdownMirrorFolder: '',
+    noteWatchFolder: '',
 	...CUSTOM_DICTIONARY_DEFAULT_SETTINGS,
 }
 
@@ -110,7 +112,11 @@ export class SupernoteSettingTab extends PluginSettingTab {
                     }),
             );
 
-        new Setting(containerEl)
+        const autoSyncGroup = containerEl.createDiv();
+        autoSyncGroup.style.cssText =
+            'border: 1px solid var(--background-modifier-border); border-radius: var(--radius-m, 8px); overflow: hidden; margin-bottom: 16px;';
+
+        new Setting(autoSyncGroup)
             .setName('Auto-sync .note files to markdown')
             .setDesc(
                 'Automatically export recognized text to a .md file whenever a .note file is added or modified in the vault.',
@@ -120,10 +126,26 @@ export class SupernoteSettingTab extends PluginSettingTab {
                     .setValue(this.plugin.settings.isAutoSyncMarkdownEnabled)
                     .onChange(async (value) => {
                         this.plugin.settings.isAutoSyncMarkdownEnabled = value;
+                        watchFolderSetting.settingEl.style.display = value ? '' : 'none';
                         await this.plugin.saveSettings();
                     }),
             );
 
+        const watchFolderSetting = new Setting(autoSyncGroup)
+            .setName('Watched folder')
+            .setDesc(
+                'Only auto-sync .note files inside this vault folder. Leave empty to watch the whole vault. When set alongside a mirror folder, the watched folder prefix is stripped from the mirror path. Example: Supernote',
+            )
+            .addText(text => text
+                .setPlaceholder('Supernote')
+                .setValue(this.plugin.settings.noteWatchFolder)
+                .onChange(async (value) => {
+                    this.plugin.settings.noteWatchFolder = value.trim().replace(/\/$/, '');
+                    await this.plugin.saveSettings();
+                })
+            );
+        watchFolderSetting.settingEl.style.display = this.plugin.settings.isAutoSyncMarkdownEnabled ? '' : 'none';
+
         new Setting(containerEl)
             .setName('Markdown mirror folder')
             .setDesc(