Automate mpy generation with Travis CI.

.travis.yml

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+# Travis CI configuration for automated .mpy file generation.
+# Author: Tony DiCola
+# License: Public Domain
+# This configuration will work with Travis CI (travis-ci.org) to automacially
+# build .mpy files for MicroPython when a new tagged release is created.  This
+# file is relatively generic and can be shared across multiple repositories by
+# following these steps:
+#   1. Copy this file into a .travis.yml file in the root of the repository.
+#   2. Change the deploy > file section below to list each of the .mpy files
+#      that should be generated.  The config will automatically look for
+#      .py files with the same name as the source for generating the .mpy files.
+#      Note that the .mpy extension should be lower case!
+#   3. Commit the .travis.yml file and push it to GitHub.
+#   4. Go to travis-ci.org and find the repository (it needs to be setup to access
+#      your github account, and your github account needs access to write to the
+#      repo).  Flip the 'ON' switch on for Travis and the repo, see the Travis
+#      docs for more details: https://docs.travis-ci.com/user/getting-started/
+#   5. Get a GitHub 'personal access token' which has at least 'public_repo' or
+#      'repo' scope: https://help.github.com/articles/creating-an-access-token-for-command-line-use/
+#      Keep this token safe and secure!  Anyone with the token will be able to
+#      access and write to your GitHub repositories.  Travis will use the token
+#      to attach the .mpy files to the release.
+#   6. In the Travis CI settings for the repository that was enabled find the
+#      environment variable editing page: https://docs.travis-ci.com/user/environment-variables/#Defining-Variables-in-Repository-Settings
+#      Add an environment variable named GITHUB_TOKEN and set it to the value
+#      of the GitHub personal access token above.  Keep 'Display value in build
+#      log' flipped off.
+#   7. That's it!  Tag a release and Travis should go to work to add .mpy files
+#      to the release.  It takes about a 2-3 minutes for a worker to spin up,
+#      build mpy-cross, and add the binaries to the release.
+language: generic
+
+sudo: true
+
+deploy:
+  provider: releases
+  api_key: $GITHUB_TOKEN
+  file:
+  - "max7219.mpy"
+  skip_cleanup: true
+  on:
+    tags: true
+
+before_install:
+- sudo apt-get -yqq update
+- sudo apt-get install -y build-essential git python python-pip
+- git clone https://github.com/adafruit/micropython.git
+- make -C micropython/mpy-cross
+- export PATH=$PATH:$PWD/micropython/mpy-cross/
+- sudo pip install shyaml
+
+before_deploy:
+- shyaml get-values deploy.file < .travis.yml | sed 's/.mpy/.py/' | xargs -L1 mpy-cross