parse output correctly

src/efibootmgr.service.test.ts

@@ -0,0 +1,41 @@
+import { describe, it } from "bun:test";
+import { EfiBootMgrService } from "./efibootmgr.service";
+
+const EXAMPLE_EFI_BOOT_MGR_OUTPUT = `BootCurrent: 0001
+Timeout: 2 seconds
+BootOrder: 0001,0004,0005,0002
+Boot0001* Fedora	HD(1,GPT,)
+Boot0002* Windows Boot Manager	HD(1,GPT,)
+Boot0004* Linux Boot Manager	HD(1,GPT,)
+Boot0005* UEFI OS	HD(1,GPT,)`;
+
+const EXAMPLE_EFI_BOOT_MGR_OUTPUT_WITH_BOOT_NEXT = `BootNext: 0002
+BootCurrent: 0001
+Timeout: 2 seconds
+BootOrder: 0001,0004,0005,0002
+Boot0001* Fedora	HD(1,GPT,)
+Boot0002* Windows Boot Manager	HD(1,GPT,)
+Boot0004* Linux Boot Manager	HD(1,GPT,)
+Boot0005* UEFI OS	HD(1,GPT,)`;
+
+describe("EfiBootMgrService", () => {
+	it("parses the example efibootmgr output and returns boot entries", () => {
+		const efiBootMgrService = new EfiBootMgrService();
+
+		const result = efiBootMgrService.parseEfiBootMgrOutput(
+			EXAMPLE_EFI_BOOT_MGR_OUTPUT,
+		);
+
+		console.log(result);
+	});
+
+	it("parses the example efibootmgr output with boot next set and returns boot entries", () => {
+		const efiBootMgrService = new EfiBootMgrService();
+
+		const result = efiBootMgrService.parseEfiBootMgrOutput(
+			EXAMPLE_EFI_BOOT_MGR_OUTPUT_WITH_BOOT_NEXT,
+		);
+
+		console.log(result);
+	});
+});

src/efibootmgr.service.ts

@@ -11,11 +11,75 @@ export class EfiBootMgrService {
 		await $`efibootmgr -n ${bootNum}`;
 	}
 
+	parseEfiBootMgrOutput(output: string): z.output<typeof BootEntries> {
+		const lines = output.split("\n");
+
+		const isBootNextSet = output.includes("BootNext:");
+
+		if (lines.length < 4) {
+			throw new Error("Invalid output!");
+		}
+
+		let outputValues: {
+			bootNext?: string;
+			bootCurrent: string;
+			timeout: string;
+			bootOrder: string;
+			entries: Array<string>;
+		};
+
+		if (isBootNextSet) {
+			const [bootNext, bootCurrent, timeout, bootOrder, ...entries] = lines;
+
+			if (!bootNext || !bootCurrent || !timeout || !bootOrder) {
+				throw new Error("Invalid output!");
+			}
+
+			outputValues = {
+				bootNext,
+				bootCurrent,
+				timeout,
+				bootOrder,
+				entries,
+			};
+		} else {
+			const [bootCurrent, timeout, bootOrder, ...entries] = lines;
+
+			if (!bootCurrent || !timeout || !bootOrder) {
+				throw new Error("Invalid output!");
+			}
+
+			outputValues = {
+				bootCurrent,
+				timeout,
+				bootOrder,
+				entries,
+			};
+		}
+
+		return outputValues.entries.map((v) => {
+			const [bootStr, labelStr] = v.split("* ");
+
+			if (!bootStr || !labelStr) throw new Error("Invalid output!");
+
+			const digits = bootStr.match(/\d/g);
+
+			if (digits === null) throw new Error("invalid output!");
+
+			const [osName] = labelStr.split("\t");
+
+			if (!osName) throw new Error("Invalid output!");
+
+			return {
+				label: osName,
+				number: Number.parseInt(digits.join(""), 10),
+			};
+		});
+	}
+
 	async listBootEntries(): Promise<z.output<typeof BootEntries>> {
 		const output = await $`efibootmgr`.text();
 
-		console.log(output);
-
-		return [];
+		return this.parseEfiBootMgrOutput(output);
 	}
 }