Exclude excalidraw files from plugin globally

Closes #37

exclusions.ts

@@ -0,0 +1,19 @@
+import { App, TFile } from 'obsidian';
+
+export function isExcalidraw(app: App, f: TFile) {
+  if (f.extension === 'excalidraw' || /.*\.excalidraw\.md$/g.test(f.path)) {
+    return true;
+  }
+  const fileCache = app.metadataCache.getFileCache(f);
+  return (
+    !!fileCache?.frontmatter && !!fileCache.frontmatter['excalidraw-plugin']
+  );
+}
+
+export function isExcluded(app: App, f: TFile) {
+  if (isExcalidraw(app, f)) {
+    return true;
+  }
+
+  return false;
+}

main.ts

@@ -12,6 +12,8 @@ import {
   Editor,
 } from 'obsidian';
 
+import { isExcluded } from './exclusions';
+
 const stockIllegalSymbols = /[\\/:|#^[\]]/g;
 
 interface LinePointer {
@@ -72,7 +74,12 @@ export default class FilenameHeadingSyncPlugin extends Plugin {
     });
   }
 
-  fileIsIgnored(path: string): boolean {
+  fileIsIgnored(activeFile: TFile, path: string): boolean {
+    // check exclusions
+    if (isExcluded(this.app, activeFile)) {
+      return true;
+    }
+
     // check manual ignore
     if (this.settings.ignoredFiles[path] !== undefined) {
       return true;
@@ -113,7 +120,7 @@ export default class FilenameHeadingSyncPlugin extends Plugin {
     }
 
     // if ignored, just bail
-    if (this.fileIsIgnored(file.path)) {
+    if (this.fileIsIgnored(file, file.path)) {
       return;
     }
 
@@ -153,7 +160,7 @@ export default class FilenameHeadingSyncPlugin extends Plugin {
     }
 
     // if oldpath is ignored, hook in and update the new filepath to be ignored instead
-    if (this.fileIsIgnored(oldPath.trim())) {
+    if (this.fileIsIgnored(file, oldPath.trim())) {
       // if filename didn't change, just bail, nothing to do here
       if (file.path === oldPath) {
         return;