Update close file logic to select prior if exists; bug fix in LSP regarding editor and assignment

src/app/common/services/files.service.ts

@@ -39,7 +39,23 @@ export class FilesService {
         return [...this.files.values()];
     }
 
-    public delete(file: NewtonFile) {
+    public getPreviousFile(path: string): NewtonFile {
+        let paths = this.getAllPaths();
+        let i     = paths.indexOf(path);
+
+        (i == 0) ? i += 1 : i -= 1;
+        return this.files.get( paths[i] );
+    }
+
+    public getNextFile(path: string): NewtonFile {
+        let paths = this.getAllPaths();
+        let i     = paths.indexOf(path);
+
+        (i > paths.length) ? i -= 1 : i += 1;
+        return this.files.get( paths[i] );
+    }
+
+    public unset(file: NewtonFile) {
         file.session.destroy();
         window.fs.closeFile(file.path);
         this.files.delete(file.path);

src/app/editor/editors.component.ts

@@ -131,16 +131,26 @@ export class EditorsComponent {
 
                 for (let i = 0; i < editors.length; i++) {
                     let editorComponent = editors[i];
-                    if (editorComponent.editor.session == file.session) {
+
+                    if (editorComponent.editor.session !== file.session) continue;
+
+                    let targetFile = this.filesService.getPreviousFile(file.path)
+                    if (targetFile) {
+                        editorComponent.assignSession(targetFile);
+                        if (activeComponent == editorComponent) {
+                            this.editorsService.miniMapView.cloneSession(targetFile);
+                        }
+                    } else {
+                        editorComponent.newFile();
                         if (activeComponent == editorComponent) {
                             this.editorsService.miniMapView.newFile();
                         }
-                        editorComponent.newFile();
                     }
+
                 }
 
                 activeComponent.lspManagerService.closeDocument(file.session);
-                this.filesService.delete(file);
+                this.filesService.unset(file);
             }
 
         });

src/app/editor/lsp-manager/lsp-manager.component.html

@@ -42,7 +42,6 @@
         <div class="col">
             Target Editor:  <label [innerText]="editor?.id || '...'"></label>
         </div>
-
         <div class="col-sm" [hidden]="!lspManagerService.workspaceFolder">
             <button class="btn btn-sm btn-dark"
                 (click)="registerEditorToLanguageClient()">

src/app/editor/lsp-manager/lsp-manager.component.ts

@@ -37,8 +37,6 @@ export class LspManagerComponent {
     activeFile: any;
 
 
-
-
     constructor() {
     }
 
@@ -139,6 +137,7 @@ export class LspManagerComponent {
     }
 
     private editorUpdate(message: ServiceMessage) {
+        if (!this.editor) return;
         if (!message.rawData.activeFile) return;
 
         this.editor.setSession(message.rawData.editor.getSession())