Piglow support (#5302)

* Add support for Piglow

* Updated coverage and requirements

* Add support for Piglow

* Updated coverage and requirements

* Fix linting errors

* Fix linting errors

* Remove trailing whitespace

* Shorter lines

* Remove trailing whitespace

* Update piglow.py

* Pinned piglow version

* Remove unused method

* Remove unused imports

* Fix lint errors

* Update requirements all

* Updated Piglow to allow the component name to be changed

* Fix imports

* Pass in name

* The piglow platform now fails if it cannot detect the piglow device

* Tidy subprocess import

.coveragerc

@@ -201,6 +201,7 @@ omit =
     homeassistant/components/light/tikteck.py
     homeassistant/components/light/x10.py
     homeassistant/components/light/yeelight.py
+    homeassistant/components/light/piglow.py
     homeassistant/components/light/zengge.py
     homeassistant/components/lirc.py
     homeassistant/components/media_player/anthemav.py

homeassistant/components/light/piglow.py

@@ -0,0 +1,104 @@
+"""
+Support for Piglow LED's.
+
+For more details about this platform, please refer to the documentation at
+https://home-assistant.io/components/light.piglow/
+"""
+import logging
+import subprocess
+
+import voluptuous as vol
+
+# Import the device class from the component that you want to support
+from homeassistant.components.light import (
+    ATTR_BRIGHTNESS, SUPPORT_BRIGHTNESS,
+    ATTR_RGB_COLOR, SUPPORT_RGB_COLOR,
+    Light, PLATFORM_SCHEMA)
+from homeassistant.const import CONF_NAME
+import homeassistant.helpers.config_validation as cv
+
+# Home Assistant depends on 3rd party packages for API specific code.
+REQUIREMENTS = ['piglow==1.2.4']
+
+_LOGGER = logging.getLogger(__name__)
+
+SUPPORT_PIGLOW = (SUPPORT_BRIGHTNESS | SUPPORT_RGB_COLOR)
+
+DEFAULT_NAME = 'Piglow'
+
+PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend({
+    vol.Optional(CONF_NAME, default=DEFAULT_NAME): cv.string,
+})
+
+
+def setup_platform(hass, config, add_devices, discovery_info=None):
+    """Setup the Piglow Light platform."""
+    import piglow
+
+    if subprocess.getoutput("i2cdetect  -q -y 1 | grep -o 54") != '54':
+        _LOGGER.error("A Piglow device was not found")
+        return False
+
+    name = config.get(CONF_NAME)
+
+    # Add devices
+    add_devices([PiglowLight(piglow, name)])
+
+
+class PiglowLight(Light):
+    """Representation of an Piglow Light."""
+
+    def __init__(self, piglow, name):
+        """Initialize an PiglowLight."""
+        self._piglow = piglow
+        self._name = name
+        self._is_on = False
+        self._brightness = 255
+        self._rgb_color = [255, 255, 255]
+
+    @property
+    def name(self):
+        """Return the display name of this light."""
+        return self._name
+
+    @property
+    def brightness(self):
+        """Brightness of the light (an integer in the range 1-255)."""
+        return self._brightness
+
+    @property
+    def rgb_color(self):
+        """Read back the color of the light."""
+        return self._rgb_color
+
+    @property
+    def supported_features(self):
+        """Flag supported features."""
+        return SUPPORT_PIGLOW
+
+    @property
+    def is_on(self):
+        """Return true if light is on."""
+        return self._is_on
+
+    def turn_on(self, **kwargs):
+        """Instruct the light to turn on."""
+        self._piglow.clear()
+        self._brightness = kwargs.get(ATTR_BRIGHTNESS, 255)
+        percent_bright = (self._brightness / 255)
+
+        if ATTR_RGB_COLOR in kwargs:
+            self._rgb_color = kwargs[ATTR_RGB_COLOR]
+            self._piglow.red(int(self._rgb_color[0] * percent_bright))
+            self._piglow.green(int(self._rgb_color[1] * percent_bright))
+            self._piglow.blue(int(self._rgb_color[2] * percent_bright))
+        else:
+            self._piglow.all(self._brightness)
+        self._piglow.show()
+        self._is_on = True
+
+    def turn_off(self, **kwargs):
+        """Instruct the light to turn off."""
+        self._piglow.clear()
+        self._piglow.show()
+        self._is_on = False

requirements_all.txt

@@ -348,6 +348,9 @@ pexpect==4.0.1
 # homeassistant.components.light.hue
 phue==0.9
 
+# homeassistant.components.light.piglow
+piglow==1.2.4
+
 # homeassistant.components.pilight
 pilight==0.1.1