test: add dedicated status porcelain line parser with coverage

src/shared/git-worktree/parse-status-porcelain-line.test.ts

@@ -0,0 +1,72 @@
+/// <reference types="bun-types" />
+
+import { describe, expect, test } from "bun:test"
+import { parseGitStatusPorcelainLine } from "./parse-status-porcelain-line"
+
+describe("parseGitStatusPorcelainLine", () => {
+	test("#given modified porcelain line #when parsing #then returns modified status", () => {
+		//#given
+		const line = " M src/a.ts"
+
+		//#when
+		const result = parseGitStatusPorcelainLine(line)
+
+		//#then
+		expect(result).toEqual({ filePath: "src/a.ts", status: "modified" })
+	})
+
+	test("#given added porcelain line #when parsing #then returns added status", () => {
+		//#given
+		const line = "A  src/b.ts"
+
+		//#when
+		const result = parseGitStatusPorcelainLine(line)
+
+		//#then
+		expect(result).toEqual({ filePath: "src/b.ts", status: "added" })
+	})
+
+	test("#given untracked porcelain line #when parsing #then returns added status", () => {
+		//#given
+		const line = "?? src/c.ts"
+
+		//#when
+		const result = parseGitStatusPorcelainLine(line)
+
+		//#then
+		expect(result).toEqual({ filePath: "src/c.ts", status: "added" })
+	})
+
+	test("#given deleted porcelain line #when parsing #then returns deleted status", () => {
+		//#given
+		const line = "D  src/d.ts"
+
+		//#when
+		const result = parseGitStatusPorcelainLine(line)
+
+		//#then
+		expect(result).toEqual({ filePath: "src/d.ts", status: "deleted" })
+	})
+
+	test("#given empty line #when parsing #then returns null", () => {
+		//#given
+		const line = ""
+
+		//#when
+		const result = parseGitStatusPorcelainLine(line)
+
+		//#then
+		expect(result).toBeNull()
+	})
+
+	test("#given malformed line without path #when parsing #then returns null", () => {
+		//#given
+		const line = " M "
+
+		//#when
+		const result = parseGitStatusPorcelainLine(line)
+
+		//#then
+		expect(result).toBeNull()
+	})
+})

src/shared/git-worktree/parse-status-porcelain-line.ts

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+import type { GitFileStatus } from "./types"
+
+export interface ParsedGitStatusPorcelainLine {
+	filePath: string
+	status: GitFileStatus
+}
+
+function toGitFileStatus(statusToken: string): GitFileStatus {
+	if (statusToken === "A" || statusToken === "??") return "added"
+	if (statusToken === "D") return "deleted"
+	return "modified"
+}
+
+export function parseGitStatusPorcelainLine(
+	line: string,
+): ParsedGitStatusPorcelainLine | null {
+	if (!line) return null
+
+	const statusToken = line.substring(0, 2).trim()
+	const filePath = line.substring(3)
+	if (!filePath) return null
+
+	return {
+		filePath,
+		status: toGitFileStatus(statusToken),
+	}
+}