Fixups and cleanup for build script.

* No need to copy already symlinked README.
* Help Windows find pnpm.
  Ref: https://stackoverflow.com/questions/3022013/windows-cant-find-the-file-on-subprocess-call

backend/build.py

@@ -1,47 +1,61 @@
-"""Build scritp gets called on poetry build."""
+"""Build script gets called on poetry/pip build."""
 
 import pathlib
 import shutil
 import subprocess
 
 
-def pnpm_install(project_root):
-    subprocess.run(["pnpm", "install"], cwd=project_root)
+def pnpm_install(project_root, pnpm_path):
+    subprocess.run([pnpm_path, "install"], cwd=project_root, check=True)
 
 
-def pnpm_buildui(project_root):
-    subprocess.run(["pnpm", "buildUi"], cwd=project_root)
+def pnpm_buildui(project_root, pnpm_path):
+    subprocess.run([pnpm_path, "buildUi"], cwd=project_root, check=True)
 
 
 def copy_frontend(project_root):
     """Copy the frontend dist directory to the backend for inclusion in the package."""
 
     # Create backend frontend dist dir
-    backend_frontend_dir = project_root / "backend" / "chainlit" / "frontend"
+    backend_frontend_dir = project_root / "backend" / "chainlit" / "frontend" / "dist"
     backend_frontend_dir.mkdir(parents=True, exist_ok=True)
 
     # Recursively copy frontend_dist to backend_frontend_dir
     frontend_dist = project_root / "frontend" / "dist"
 
-    shutil.copytree(frontend_dist, backend_frontend_dir / "dist", dirs_exist_ok=True)
+    print(f"Copying {frontend_dist} to {backend_frontend_dir}")
+    shutil.copytree(frontend_dist, backend_frontend_dir, dirs_exist_ok=True)
 
 
 def copy_copilot(project_root):
     """Copy the copilot dist directory to the backend for inclusion in the package."""
 
     # Create backend copilot dir
-    backend_copilot_dir = project_root / "backend" / "chainlit" / "copilot"
+    backend_copilot_dir = project_root / "backend" / "chainlit" / "copilot" / "dist"
     backend_copilot_dir.mkdir(parents=True, exist_ok=True)
 
     # Recursively copy copilot_dist to backend_copilot_dir
     copilot_dist = project_root / "libs" / "copilot" / "dist"
 
-    shutil.copytree(copilot_dist, backend_copilot_dir / "dist", dirs_exist_ok=True)
+    print(f"Copying {copilot_dist} to {backend_copilot_dir}")
+    shutil.copytree(copilot_dist, backend_copilot_dir, dirs_exist_ok=True)
 
 
-if __name__ == "__main__":
-    project_root = pathlib.Path.cwd().parent
-    pnpm_install(project_root)
-    pnpm_buildui(project_root)
+def build():
+    # Find directory containing this file.
+    backend_dir = pathlib.Path(__file__).resolve().parent
+    project_root = backend_dir.parent
+
+    pnpm = shutil.which("pnpm")
+    if not pnpm:
+        print("pnpm not found!")
+        exit(-1)
+
+    pnpm_install(project_root, pnpm)
+    pnpm_buildui(project_root, pnpm)
     copy_frontend(project_root)
     copy_copilot(project_root)
+
+
+if __name__ == "__main__":
+    build()