Add PyInstaller spec file and Windows instructions

- This patch creates a spec file to build single-file binaries using
  PyInstaller and adds a markdown file with instructions for Windows
  users.

Author: bitoffdev

README.md

@@ -5,3 +5,6 @@ Tkinter.
 
 ![Screenshot](docs/2021-01-25-005820_448x480_scrot.png)
 
+## Windows
+
+See [docs/windows.md](docs/windows.md).

docs/windows.md

@@ -0,0 +1,27 @@
+# Windows
+
+## Build
+
+First, install chocolatey.
+
+In powershell, run `choco install python --version 3.7.2`. **The version of python is important**. This project requires Python 3.6+ for typing and asyncio. Furthermore, pyinstaller only supports up to Python 3.7 as of January, 2021.
+
+### Install virtualenv and create a new environment
+
+In powershell, run `C:\Python37\python.exe -m pip install --user virtualenv`.
+
+In powershell, run `C:\Python37\python.exe -m virtualenv env`.
+
+Note: From here onward, we will use the virtualenv's python with `.\env\Scripts\python.exe`.
+
+### Install Python packages
+
+In powershell, run `.\env\Scripts\python.exe -m pip install -r requirements.txt`.
+
+### Build a single executable with PyInstaller
+
+In powershell, run `.\env\Scripts\python.exe -m pip install pyinstaller`.
+
+In powershell, run `.\env\Scripts\pyinstaller.exe .\kasatk.spec`.
+
+In powershell, your freshly built executable with `.\dist\kasatk.spec`.

kasatk.spec

@@ -0,0 +1,47 @@
+# -*- mode: python ; coding: utf-8 -*-
+
+block_cipher = None
+
+def kasa_dist_info_datas():
+    """find the kasa-python dist-info directory
+
+    pyinstaller doesn't seem to include the dist-info directory, which causes a runtime issue. This is a workaround.
+    """
+    import os, sys
+    for import_path in sys.path:
+        if not os.path.isdir(import_path):
+            continue
+        for name in os.listdir(import_path):
+            if "kasa" in name and name[-9:] == "dist-info":
+                full_path = os.path.join(import_path, name)
+                return (full_path, name)
+    raise Exception("Could not find python-kasa dist info directory")
+
+a = Analysis(['kasatk/__main__.py'],
+             pathex=['.\\env\\Lib\\site-packages\\', '.'],
+             binaries=[],
+             datas=[kasa_dist_info_datas()],
+             hiddenimports=[],
+             hookspath=[],
+             runtime_hooks=[],
+             excludes=[],
+             win_no_prefer_redirects=False,
+             win_private_assemblies=False,
+             cipher=block_cipher,
+             noarchive=False)
+pyz = PYZ(a.pure, a.zipped_data,
+             cipher=block_cipher)
+exe = EXE(pyz,
+          a.scripts,
+          a.binaries,
+          a.zipfiles,
+          a.datas,
+          [],
+          name='kasatk',
+          debug=False,
+          bootloader_ignore_signals=False,
+          strip=False,
+          upx=True,
+          upx_exclude=[],
+          runtime_tmpdir=None,
+          console=True )