simplify install process

Author: jackw01

README.md

@@ -32,16 +32,13 @@ For installations with over 150 LEDs, don't expect to get good or safe results b
 More information on connecting LED strips and PWM/DMA usage is available [here](https://github.com/jgarff/rpi_ws281x).
 
 ### Software Setup
-Python 3.6 or newer is required.
+Python 3.7 or newer is required.
 
 1. `sudo apt-get install scons swig`
 2. `git clone --recurse-submodules https://github.com/jackw01/led-control.git`
 3. `cd led-control`
-4. `cd ledcontrol/driver/rpi_ws281x/`
-5. `scons`
-6. `cd ../../..`
-7. `sudo python3 setup.py develop`
-8. `sudo ledcontrol --led_count 150` (add `--led_pixel_order GRBW` if using RGBW LEDs)
+4. `sudo python3 setup.py develop`
+5. `sudo ledcontrol --led_count 150` (add `--led_pixel_order GRBW` if using RGBW LEDs)
 
 ### Command Line Configuration Arguments
 Web server and LED hardware parameters must be specified as command line arguments when running ledcontrol.

preinstall

@@ -0,0 +1,2 @@
+#!/usr/bin/env bash
+cd ledcontrol/driver/rpi_ws281x/ && scons

setup.py

@@ -2,6 +2,23 @@
 # -*- coding: utf-8 -*-
 
 from setuptools import find_packages, setup, Extension
+from setuptools.command.develop import develop
+from setuptools.command.install import install
+from subprocess import check_call
+
+def pre_install():
+    print('preinstall')
+    check_call('scons', cwd='ledcontrol/driver/rpi_ws281x/')
+
+class PreDevelopCommand(develop):
+    def run(self):
+        pre_install()
+        develop.run(self)
+
+class PreInstallCommand(install):
+    def run(self):
+        pre_install()
+        install.run(self)
 
 requirements = [
     'recordclass>=0.12.0.1',
@@ -36,6 +53,10 @@
             'ledcontrol=ledcontrol:main'
         ]
     },
+    cmdclass={
+        'develop': PreDevelopCommand,
+        'install': PreInstallCommand,
+    },
     license='MIT',
     classifiers=[
         # Trove classifiers