feat: Add URI handler for jumping to targets (#431)

This feature will allow us to add links to documents, and tool output which jumps to specific targets, reducing friction and wasted time.

URI handler works such that:

vscode://bazelbuild.vscode-bazel//my/path/to/tests:target

(unfortunately github itself won't link out to non-http urls)

Will jump to said target given vscode is opened to a workspace which contains a bazel workspace with that target as the first workspaceFolder

I imagine we could handle more situations like:

vscode://bazelbuild.vscode-bazel/fspath/to/workspace//my/path/to/tests:target

or

vscode://bazelbuild.vscode-bazel/test//my/path/to/tests:target

But I imagine anything of the sort would be more controversial.

src/definition/bazel_goto_definition_provider.ts

@@ -28,6 +28,37 @@ import { blaze_query } from "../protos";
 // LABEL_REGEX matches label strings, e.g. @r//x/y/z:abc
 const LABEL_REGEX = /"((?:@\w+)?\/\/|(?:.+\/)?[^:]*(?::[^:]+)?)"/;
 
+export async function targetToUri(
+  targetText: string,
+  workingDirectory: Uri,
+): Promise<QueryLocation | undefined> {
+  const match = LABEL_REGEX.exec(targetText);
+
+  const targetName = match[1];
+  // don't try to process visibility targets.
+  if (targetName.startsWith("//visibility")) {
+    return null;
+  }
+
+  const queryResult = await new BazelQuery(
+    getDefaultBazelExecutablePath(),
+    workingDirectory.fsPath,
+  ).queryTargets(`kind(rule, "${targetName}") + kind(file, "${targetName}")`);
+
+  if (!queryResult.target.length) {
+    return null;
+  }
+  const result = queryResult.target[0];
+  let location;
+  if (result.type === blaze_query.Target.Discriminator.RULE) {
+    location = new QueryLocation(result.rule.location);
+  } else {
+    location = new QueryLocation(result.sourceFile.location);
+  }
+
+  return location;
+}
+
 export class BazelGotoDefinitionProvider implements DefinitionProvider {
   public async provideDefinition(
     document: TextDocument,
@@ -41,35 +72,19 @@ export class BazelGotoDefinitionProvider implements DefinitionProvider {
 
     const range = document.getWordRangeAtPosition(position, LABEL_REGEX);
     const targetText = document.getText(range);
-    const match = LABEL_REGEX.exec(targetText);
-
-    const targetName = match[1];
-    // don't try to process visibility targets.
-    if (targetName.startsWith("//visibility")) {
-      return null;
-    }
 
-    const queryResult = await new BazelQuery(
-      getDefaultBazelExecutablePath(),
-      Utils.dirname(document.uri).fsPath,
-    ).queryTargets(`kind(rule, "${targetName}") + kind(file, "${targetName}")`);
+    const location = await targetToUri(targetText, Utils.dirname(document.uri));
 
-    if (!queryResult.target.length) {
-      return null;
-    }
-    const result = queryResult.target[0];
-    let location;
-    if (result.type === blaze_query.Target.Discriminator.RULE) {
-      location = new QueryLocation(result.rule.location);
-    } else {
-      location = new QueryLocation(result.sourceFile.location);
-    }
-    return [
-      {
-        originSelectionRange: range,
-        targetUri: Uri.file(location.path),
-        targetRange: location.range,
-      },
-    ];
+    return location
+      ? [
+          {
+            originSelectionRange: range,
+            targetUri: Uri.file(location.path).with({
+              fragment: `${location.line}:${location.column}`,
+            }),
+            targetRange: location.range,
+          },
+        ]
+      : null;
   }
 }

src/extension/extension.ts

@@ -27,7 +27,10 @@ import {
 } from "../buildifier";
 import { BazelBuildCodeLensProvider } from "../codelens";
 import { BazelCompletionItemProvider } from "../completion-provider";
-import { BazelGotoDefinitionProvider } from "../definition/bazel_goto_definition_provider";
+import {
+  BazelGotoDefinitionProvider,
+  targetToUri,
+} from "../definition/bazel_goto_definition_provider";
 import { BazelTargetSymbolProvider } from "../symbols";
 import { BazelWorkspaceTreeProvider } from "../workspace-tree";
 import { activateCommandVariables } from "./command_variables";
@@ -105,6 +108,33 @@ export async function activate(context: vscode.ExtensionContext) {
       "bazel.copyTargetToClipboard",
       bazelCopyTargetToClipboard,
     ),
+    // URI handler
+    vscode.window.registerUriHandler({
+      async handleUri(uri: vscode.Uri) {
+        try {
+          const workspace = vscode.workspace.workspaceFolders[0];
+          const quotedUriPath = `"${uri.path}"`;
+          const location = await targetToUri(quotedUriPath, workspace.uri);
+
+          vscode.commands
+            .executeCommand(
+              "vscode.open",
+              vscode.Uri.file(location.path).with({
+                fragment: `${location.line}:${location.column}`,
+              }),
+            )
+            .then(undefined, (err) => {
+              void vscode.window.showErrorMessage(
+                `Could not open file: ${location.path} Error: ${err}`,
+              );
+            });
+        } catch (err: any) {
+          void vscode.window.showErrorMessage(
+            `While handling URI: ${JSON.stringify(uri)} Error: ${err}`,
+          );
+        }
+      },
+    }),
     // CodeLens provider for BUILD files
     vscode.languages.registerCodeLensProvider(
       [{ pattern: "**/BUILD" }, { pattern: "**/BUILD.bazel" }],