Add quick fix to remove or add leading command slash

packages/locales/src/locales/en.json

@@ -8,6 +8,7 @@
   "code-action.fix-workspace": "Fix all auto-fixable problems in the workspace",
   "code-action.id-attribute-datafix": "Update this attribute name to 1.16",
   "code-action.add-default-namespace": "Add default namespace",
+  "code-action.add-leading-slash": "Add leading slash",
   "code-action.create-undeclared-file": "Create %0% %1% in the same pack",
   "code-action.id-omit-default-namespace": "Omit default namespace",
   "code-action.id-zombified-piglin-datafix": "Change this ID to Zombified Piglin's",
@@ -19,6 +20,7 @@
   "code-action.nbt-type-to-long": "Convert to an NBT long tag",
   "code-action.nbt-type-to-short": "Convert to an NBT short tag",
   "code-action.nbt-uuid-datafix": "Update this UUID to 1.16",
+  "code-action.remove-leading-slash": "Remove leading slash",
   "code-action.remove-trailing-separation": "Remove trailing separation",
   "code-action.selector-sort-keys": "Sort selector argument",
   "code-action.string-double-quote": "Quote this string with double quotation marks",

packages/mcfunction/src/parser/command.ts

@@ -36,12 +36,43 @@ export function command(
 		if (src.trySkip('/')) {
 			ans.slash = core.Range.create(start, src.cursor)
 			if (!options.slash) {
-				ctx.err.report(localize('mcfunction.parser.leading-slash.unexpected'), ans.slash)
+				ctx.err.report(
+					localize('mcfunction.parser.leading-slash.unexpected'),
+					ans.slash,
+					core.ErrorSeverity.Error,
+					{
+						codeAction: {
+							title: localize('code-action.remove-leading-slash'),
+							isPreferred: true,
+							changes: [
+								{
+									type: 'edit',
+									range: ans.slash,
+									text: '',
+								},
+							],
+						},
+					},
+				)
 			}
 		} else if (options.slash === 'required') {
 			ctx.err.report(
 				localize('expected', localize('mcfunction.parser.leading-slash')),
 				core.Range.create(start, start + 1),
+				core.ErrorSeverity.Error,
+				{
+					codeAction: {
+						title: localize('code-action.add-leading-slash'),
+						isPreferred: true,
+						changes: [
+							{
+								type: 'edit',
+								range: core.Range.create(start),
+								text: '/',
+							},
+						],
+					},
+				},
 			)
 		}