Fix Travis CI, add SAMD test support, support GNU grep on macOS

[tuna-f1sh]

Content as subject, includes fix #625. Includes @sej7278's Python 3 branch. BSD grep was creating some warnings parsing boards.txt that were annoying!

[tuna-f1sh]

Now includes #630 (manual as @osamuaoki's branch has gone awol).

[sej7278]

👍

[sej7278]

Now includes #630 (manual as @osamuaoki's branch has gone awol).

i'm still not 100% sure about that one after building a package from your branch today.

in the debian package it doesn't work as ARDMK_DIR isn't defined anywhere and even if you define it, you can't build the examples as you can't write to /usr/share/doc/arduino-mk/examples

at least with ../../Arduino.mk it works for a git checkout.

seems like the debian package would require the user to copy the examples to their sketchbook directory and define ARDMK_DIR in their local Makefile, like:

ARDMK_DIR = /usr/share/arduino
#ARDMK_DIR = ../../
BOARD_TAG = uno
include $(ARDMK_DIR)/Arduino.mk

at which point setting ARDMK_DIR seems a bit pointless and you may as well stick with:

BOARD_TAG = uno
include /usr/share/arduino/Arduino.mk

The examples like Blink already show you the options:

BOARD_TAG    = uno
include ../../Arduino.mk

# --- leonardo (or pro micro w/leo bootloader)
#BOARD_TAG    = leonardo
#MONITOR_PORT = /dev/ttyACM0
#include /usr/share/arduino/Arduino.mk

We could even use some sed to replace the include line when building the Debian/Fedora packages.

so maybe we should drop that commit from this PR?

[tuna-f1sh]

I thought the thinking was that since the README mandates that ARDMK_DIR should be defined by the user, the examples failing helps to ensure this?

Could add in a catch to check for ARDMK_DIR and error if undefined with helpful hint or define it to as it was prior:

ifdef ARDMK_DIR
    include $(ARDMK_DIR)/Arduino.mk
else
    $(info ! Using project relative ARDMK_DIR, please define environment variable ARDMK_DIR as Arduino-Makefile installation directory for external use)
    include ../../Arduino.mk
endif

[sej7278]

where would you put that though - in every example?

[tuna-f1sh]

Yes would be quite messy. It does make the example Makefiles better for copying into a project however.

Don't mind, can just remove it and revert back to relative path for all the Makefiles.

[sej7278]

yeah if you can revert it back to ../../ we can look at it again afterwards maybe

[tuna-f1sh]

It's gone.

[tuna-f1sh]

Have you had chance to review @sudar ? Would be good to get a 2.0 release after this push to fix the Python 3 shebang problem.

[sudar]

@tuna-f1sh

I finally got some time this weekend to test it.

I will merge it mostly by tomorrow.

[sudar]

Sorry guys, what I thought will take just 2 days ended up being 2 weeks. Finally I was able to test the fix and have just merged it.

Thanks @sej7278 @tuna-f1sh and others who helped to get this done.