Call git blame directly and parse porcelain

src/extension.ts

@@ -1,5 +1,44 @@
 import * as vscode from "vscode";
-import { GitExtension, Repository, API } from "./git";
+import * as cp from "child_process";
+
+function parseGitBlamePorcelain(blame: string): { [key: string]: string } {
+  const fields = Object.fromEntries(
+    blame
+      .trim()
+      .split("\n")
+      .map((line: string) => {
+        const words = line.split(" ");
+        const key = words[0];
+        const value = words.slice(1).join(" ");
+        return [key, value];
+      })
+  );
+  return fields;
+}
+
+function relativeTimePassed(now: number, past: number): string {
+  var msMinutes = 60 * 1000;
+  var msHours = msMinutes * 60;
+  var msDays = msHours * 24;
+  var msMonths = msDays * 30;
+  var msYears = msDays * 365;
+
+  var diff = now - past;
+
+  if (diff < msMinutes) {
+    return Math.round(diff / 1000) + " seconds ago";
+  } else if (diff < msHours) {
+    return Math.round(diff / msMinutes) + " minutes ago";
+  } else if (diff < msDays) {
+    return Math.round(diff / msHours) + " hours ago";
+  } else if (diff < msMonths) {
+    return "Around " + Math.round(diff / msDays) + " days ago";
+  } else if (diff < msYears) {
+    return "Around " + Math.round(diff / msMonths) + " months ago";
+  } else {
+    return "Around " + Math.round(diff / msYears) + " years ago";
+  }
+}
 
 const annotationDecoration: vscode.TextEditorDecorationType =
   vscode.window.createTextEditorDecorationType({
@@ -25,33 +64,37 @@ export function activate(context: vscode.ExtensionContext) {
         activeEditor.selection.active.line
       );
 
-      const gitExtension =
-        vscode.extensions.getExtension<GitExtension>("vscode.git");
-      if (gitExtension === undefined) {
-        vscode.window.showErrorMessage("Unable to load git extension");
-        return;
-      }
-      const git = gitExtension.exports.getAPI(1);
-      const repo = git.getRepository(activeEditor.document.uri);
+      const file = activeEditor.document.uri;
+      const line = activeLine.lineNumber;
+      const command = "git";
+      const args = ["blame", "--porcelain", `-L${line},+1`, file.fsPath];
+      const workspaceFolder =
+        vscode.workspace.getWorkspaceFolder(file)?.uri.path;
+      const options = { cwd: workspaceFolder };
+      const cmd = cp.spawn(command, args, options);
 
-      if (repo === null) {
-        vscode.window.showErrorMessage("Unable to get git repository");
-        return;
-      }
+      cmd.stdout.on("data", (data) => {
+        const blame = data.toString();
+
+        const fields = parseGitBlamePorcelain(blame);
 
-      repo.blame(activeEditor.document.uri.path).then((blame) => {
-        const range = activeEditor.document.validateRange(
-          new vscode.Range(
-            activeLine.lineNumber,
-            activeLine.text.length,
-            activeLine.lineNumber,
-            0
-          )
+        const range = new vscode.Range(
+          activeLine.lineNumber,
+          activeLine.text.length,
+          activeLine.lineNumber,
+          0
         );
 
-        // TODO Pretty format and only use blame for selected line.
-        // activeLine.text
-        const message = blame;
+        const elapsed = relativeTimePassed(
+          Date.now(),
+          parseInt(fields["author-time"])
+        );
+
+        // TODO If same username, write "You" instead of username.
+        // TODO If dirty, set summary to "Uncommitted changes".
+        // TODO If close in time, set summary to "now".
+        const message = `${fields.author}, ${elapsed} • ${fields.summary}`;
+        const hoverMessage = JSON.stringify(fields, null, 2);
 
         const renderOptions = {
           after: {
@@ -60,12 +103,16 @@ export function activate(context: vscode.ExtensionContext) {
             contentText: message,
             fontWeight: "normal",
             fontStyle: "normal",
-            textDecoration: "none; opacity: 0.5; position: absolute;",
+            textDecoration: "none; opacity: 0.25; position: absolute;",
           },
         };
 
         const decorations = [
-          { range: range, hoverMessage: message, renderOptions: renderOptions },
+          {
+            range: range,
+            hoverMessage: hoverMessage,
+            renderOptions: renderOptions,
+          },
         ];
 
         activeEditor.setDecorations(annotationDecoration, decorations);
@@ -74,5 +121,4 @@ export function activate(context: vscode.ExtensionContext) {
   );
 }
 
-// This method is called when your extension is deactivated
 export function deactivate() {}