feat: initial project setup with gai tool

src/selector.ts

@@ -0,0 +1,62 @@
+import * as readline from "node:readline";
+import type { FileEntry } from "./types";
+import { BOLD, GREEN, YELLOW, CYAN, RESET } from "./terminal";
+
+export async function selectFiles(
+  stagedFiles: FileEntry[],
+  unstagedFiles: FileEntry[],
+): Promise<string[]> {
+  if (unstagedFiles.length === 0) return [];
+
+  if (stagedFiles.length > 0) {
+    console.log(`\n  ${BOLD}Staged files (will be included):${RESET}`);
+    for (const f of stagedFiles) {
+      console.log(`    ${GREEN}✓${RESET} ${f.path} (${YELLOW}${f.label}${RESET})`);
+    }
+  }
+
+  console.log(`\n  ${BOLD}Unstaged files:${RESET}`);
+  for (let i = 0; i < unstagedFiles.length; i++) {
+    const f = unstagedFiles[i]!;
+    console.log(
+      `    ${CYAN}${i + 1}.${RESET} ${f.path} (${YELLOW}${f.label}${RESET})`,
+    );
+  }
+
+  console.log("");
+  const rl = readline.createInterface({
+    input: process.stdin,
+    output: process.stdout,
+  });
+
+  return new Promise((resolve) => {
+    rl.question(
+      "  Enter files to stage (e.g. 1,3) or 'a' for all: ",
+      (answer) => {
+        rl.close();
+        const trimmed = answer.trim().toLowerCase();
+
+        if (trimmed === "a" || trimmed === "all") {
+          resolve(unstagedFiles.map((f) => f.path));
+          return;
+        }
+
+        if (trimmed === "") {
+          resolve([]);
+          return;
+        }
+
+        const indices = trimmed
+          .split(/[,\s]+/)
+          .map((s) => parseInt(s.trim()))
+          .filter(
+            (n) => !isNaN(n) && n >= 1 && n <= unstagedFiles.length,
+          )
+          .map((n) => n - 1);
+
+        const uniqueIndices = [...new Set(indices)];
+        resolve(uniqueIndices.map((i) => unstagedFiles[i]!.path));
+      },
+    );
+  });
+}