[clangd] Add support for FixIts.

Summary:
This uses CodeActions to show 'apply fix' actions when code actions are
requested for a location. The actions themselves make use of a
clangd.applyFix command which has to be implemented on the editor side. I
included an implementation for vscode.

This also adds a -run-synchronously flag which runs everything on the main
thread. This is useful for testing.

Reviewers: krasimir

Subscribers: cfe-commits

Differential Revision: https://reviews.llvm.org/D30498

git-svn-id: https://llvm.org/svn/llvm-project/clang-tools-extra/trunk@296636 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 17 insertions, 1 deletions

diff --git a/clangd/clients/clangd-vscode/src/extension.ts b/clangd/clients/clangd-vscode/src/extension.ts
index e57aa87a..36a5c9c0 100644
--- a/clangd/clients/clangd-vscode/src/extension.ts
+++ b/clangd/clients/clangd-vscode/src/extension.ts
@@ -18,9 +18,25 @@ export function activate(context: vscode.ExtensionContext) {
 
     const clangdClient = new vscodelc.LanguageClient('Clang Language Server', serverOptions, clientOptions);
 
+    function applyTextEdits(uri: string, edits: vscodelc.TextEdit[]) {
+        let textEditor = vscode.window.activeTextEditor;
+
+        if (textEditor && textEditor.document.uri.toString() === uri) {
+            textEditor.edit(mutator => {
+                for (const edit of edits) {
+                    mutator.replace(vscodelc.Protocol2Code.asRange(edit.range), edit.newText);
+                }
+            }).then((success) => {
+                if (!success) {
+                    vscode.window.showErrorMessage('Failed to apply fixes to the document.');
+                }
+            });
+        }
+    }
+
     console.log('Clang Language Server is now active!');
 
     const disposable = clangdClient.start();
 
-    context.subscriptions.push(disposable);
+    context.subscriptions.push(disposable, vscode.commands.registerCommand('clangd.applyFix', applyTextEdits));
 }
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