add working build settings for travis with packrat + tidyverse about tidyverse HOT 3 CLOSED

I actually now seem to have a .travis.yml that works without a hitch, and without any extra settings for all things tidyverse, but I am not sure whether it is recommended (since it relies on the yet beta-ish trusty container).

Anyway, this works, and is reasonably short. No makevars shenanigans necessary, apparently.

language: r

sudo: false

dist: trusty

install:
  - R -e "0" --args --bootstrap-packrat

warnings_are_errors: false

cache:
  packages: true
  directories:
    - $TRAVIS_BUILD_DIR/_bookdown_files
    - $TRAVIS_BUILD_DIR/packrat/

before_script:
  - chmod +x ./_build.sh
  - chmod +x ./_deploy.sh

script:
  - ./_build.sh
  - ./_deploy.sh

notifications:
  email: false

from tidyverse.

I'm not sure using tidyverse in build systems is a good idea - the idea is that it makes it easy to get things for interactive use, but in this usage it's going to pull down a lot of stuff that you don't need and takes a long time to compile etc.

from tidyverse.

alright, that makes sense, thanks for the recommendation.

Still perhaps people will find above travis config helpful.

from tidyverse.