Version bump to 0.3

fixes #10

added an option to install udev rules (fixes #11)

updated makefile to adhere to DESTDIR/PREFIX conventions

updated README

3 files changed, 32 insertions, 15 deletions

diff --git a/90-brightnessctl.rules b/90-brightnessctl.rules
new file mode 100644
index 0000000..99a4c4d
--- /dev/null
+++ b/90-brightnessctl.rules
@@ -0,0 +1,4 @@
+ACTION=="add", SUBSYSTEM=="backlight", RUN+="/bin/chgrp video /sys/class/backlight/%k/brightness"
+ACTION=="add", SUBSYSTEM=="backlight", RUN+="/bin/chmod g+w /sys/class/backlight/%k/brightness"
+ACTION=="add", SUBSYSTEM=="leds", RUN+="/bin/chgrp input /sys/class/leds/%k/brightness"
+ACTION=="add", SUBSYSTEM=="leds", RUN+="/bin/chmod g+w /sys/class/leds/%k/brightness"
diff --git a/Makefile b/Makefile
index b3986fb..8f23928 100644
--- a/Makefile
+++ b/Makefile
@@ -1,13 +1,28 @@
-VERSION = 0.2
-DESTDIR ?= /usr/local
+VERSION = 0.3
 CFLAGS += -std=c99 -g -Wall -Wextra -DVERSION=\"${VERSION}\" -D_POSIX_C_SOURCE=200809L -lm
-MODE ?= 4711
+
+PREFIX ?= /usr
+BINDIR = ${DESTDIR}${PREFIX}/bin
+
+INSTALL_UDEV_RULES = 0
+
+INSTALL_UDEV_1 = install_udev_rules
+UDEVDIR ?= /lib/udev/rules.d
+
+MODE_0 = 4711
+MODE_1 = 0644
+MODE = ${MODE_${INSTALL_UDEV_RULES}}
 
 all: brightnessctl
 
-install: brightnessctl
-	install -d ${DESTDIR}/bin
-	install -m ${MODE} brightnessctl ${DESTDIR}/bin/
+install: brightnessctl ${INSTALL_UDEV_${INSTALL_UDEV_RULES}}
+	install -d ${DESTDIR}${PREFIX}/bin
+	install -m ${MODE} brightnessctl ${DESTDIR}${PREFIX}/bin/
+
+install_udev_rules:
+	install -d ${DESTDIR}${UDEVDIR}
+	install -m 0644 90-brightnessctl.rules ${DESTDIR}${UDEVDIR}
+
 
 clean:
 	rm -f brightnessctl
diff --git a/README.md b/README.md
index 5aaa3ce..7b81757 100644
--- a/README.md
+++ b/README.md
@@ -10,19 +10,17 @@ The program is available in:
 * [Fedora/EPEL](https://apps.fedoraproject.org/packages/brightnessctl)
 * [Arch Linux (AUR)](https://aur.archlinux.org/packages/brightnessctl)
 
+One can build and install the program using `make install`. Consult the Makefile for relevant build-time options.
+
 ## Permissions
 
-Modifying brightness requires write permissions for device files. This can be accomplished (without using sudo/su/etc.) by either of the following means:
+Modifying brightness requires write permissions for device files. `brightnessctl` accomplishes this (without using `sudo`/`su`/etc.) by either of the following means:
 
-1) installing brightnessctl as a suid binary (done by default)
+1) installing `brightnessctl` as a suid binary (done by default)
 
-2) adding a similar udev rule (assuming your user is in `video` group for backlight and `input` group for leds):
-```
-ACTION=="add", SUBSYSTEM=="backlight", RUN+="/bin/chgrp video /sys/class/backlight/%k/brightness"
-ACTION=="add", SUBSYSTEM=="backlight", RUN+="/bin/chmod g+w /sys/class/backlight/%k/brightness"
-ACTION=="add", SUBSYSTEM=="leds", RUN+="/bin/chgrp input /sys/class/leds/%k/brightness"
-ACTION=="add", SUBSYSTEM=="leds", RUN+="/bin/chmod g+w /sys/class/leds/%k/brightness"
-```
+2) installing relevant udev rules to add permissions to backlight class devices for users in `video` and leds for users in `input`.
+
+The behavior is controlled by the `INSTALL_UDEV_RULES` flag (setting it to `1` installs the udev rules, `0` is the default value).
 
 ## Usage
 ```