Fixes #44237: Add columnNumber variable

This adds a new variable that you can access from tasks and other
places to be able to substitute in the currently selected column number
from the active editor.

src/vs/workbench/api/common/extHostVariableResolverService.ts

@@ -117,6 +117,15 @@ class ExtHostVariableResolverService extends AbstractVariableResolverService {
 				}
 				return undefined;
 			},
+			getColumnNumber: (): string | undefined => {
+				if (editorService) {
+					const activeEditor = editorService.activeEditor();
+					if (activeEditor) {
+						return String(activeEditor.selection.end.character + 1);
+					}
+				}
+				return undefined;
+            },
 			getExtension: (id) => {
 				return extensionService.getExtension(id);
 			},

src/vs/workbench/services/configurationResolver/common/variableResolver.ts

@@ -27,6 +27,7 @@ interface IVariableResolveContext {
 	getWorkspaceFolderPathForFile?(): string | undefined;
 	getSelectedText(): string | undefined;
 	getLineNumber(): string | undefined;
+	getColumnNumber(): string | undefined;
 	getExtension(id: string): Promise<{ readonly extensionLocation: uri } | undefined>;
 }
 
@@ -307,6 +308,13 @@ export class AbstractVariableResolverService implements IConfigurationResolverSe
 						}
 						throw new VariableError(VariableKind.LineNumber, localize('canNotResolveLineNumber', "Variable {0} can not be resolved. Make sure to have a line selected in the active editor.", match));
 					}
+					case 'columnNumber': {
+						const colNumber = this._context.getColumnNumber();
+						if (colNumber) {
+							return colNumber;
+						}
+						throw new VariableError(VariableKind.LineNumber, localize('canNotResolveColumnNumber', "Variable {0} can not be resolved. Make sure to have a column selected in the active editor.", match));
+					}
 					case 'selectedText': {
 						const selectedText = this._context.getSelectedText();
 						if (selectedText) {