add replacement feature for code note

src/public/app/widgets/find.js

@@ -164,7 +164,7 @@ export default class FindWidget extends NoteContextAwareWidget {
         this.$widget.show();
         this.$input.focus();
         const isReadOnly = await this.noteContext.isReadOnly();
-        if (this.note.type === 'text' && !isReadOnly) {
+        if (['text', 'code'].includes(this.note.type) && !isReadOnly) {
             this.$replaceWidgetBox.show();
         }else{
             this.$replaceWidgetBox.hide();

src/public/app/widgets/find_in_code.js

@@ -170,4 +170,48 @@ export default class FindInCode {
 
         codeEditor.focus();
     }
+    async replace(replaceText) {
+        let currentFound = -1;
+        this.findResult.forEach((marker, index) => {
+            const pos = marker.find();
+            if (pos) {
+                if (marker.className === FIND_RESULT_SELECTED_CSS_CLASSNAME) {
+                    currentFound = index;
+                    return;
+                }
+            }
+        });
+        if (currentFound >= 0) {
+            let marker = this.findResult[currentFound];
+            let pos = marker.find();
+            const codeEditor = await this.getCodeEditor();
+            const doc = codeEditor.doc;
+            doc.replaceRange(replaceText, pos.from, pos.to);
+            marker.clear();
+
+            let nextFound;
+            if (currentFound === this.findResult.length - 1) {
+                nextFound = 0;
+            } else {
+                nextFound = currentFound;
+            }
+            this.findResult.splice(currentFound, 1);
+            if (this.findResult.length > 0) {
+                this.findNext(0, nextFound, nextFound);
+            }
+        }
+    }
+    async replaceAll(replaceText) {
+        const codeEditor = await this.getCodeEditor();
+        const doc = codeEditor.doc;
+        codeEditor.operation(() => {
+            for (let currentFound = 0; currentFound < this.findResult.length; currentFound++) {
+                let marker = this.findResult[currentFound];
+                let pos = marker.find();
+                doc.replaceRange(replaceText, pos.from, pos.to);
+                marker.clear();
+            }
+        });
+        this.findResult = [];
+    }
 }