feat: add gitignore service

src/services/gitignoreService.ts

@@ -0,0 +1,35 @@
+import { GitService } from "@/services/gitService";
+import { promises as fs } from "fs";
+import { resolve } from "path";
+
+const GITIGNORE_FILE_NAME = ".gitignore";
+const OBSIDIAN_FOLDER_NAME = ".obsidian/";
+
+const GITIGNORE_LINE = "\n# ignore obsidian vault state\n.obsidian/\n";
+
+export class GitignoreService {
+  private gitignorePath: string;
+
+  constructor(private basePath: string, private gitService: GitService) {
+    this.gitignorePath = resolve(basePath, GITIGNORE_FILE_NAME);
+  }
+
+  private async ensureGitignoreExists() {
+    try {
+      await fs.access(this.gitignorePath);
+    } catch {
+      await fs.writeFile(this.gitignorePath, "");
+    }
+  }
+
+  async ensureObsidianIgnored(): Promise<void> {
+    const obsidianFolderPath = resolve(this.basePath, OBSIDIAN_FOLDER_NAME);
+
+    if (await this.gitService.isPathTracked(obsidianFolderPath)) {
+      await this.gitService.removePathFromHistory(`${OBSIDIAN_FOLDER_NAME}*`);
+
+      await this.ensureGitignoreExists();
+      await fs.appendFile(this.gitignorePath, GITIGNORE_LINE);
+    }
+  }
+}