Attempt to cache bundles for all repos.

I discovered that the reason travis wasn’t caching
them is because it run `bundle clean` at the end just
before caching the bundle, which removes the gems needed
by the other repos. By having a separate bundle for
each repo, each cached, we can get travis to cache them all.

For #101.

travis/.travis.yml

@@ -1,12 +1,18 @@
 language: ruby
 sudo: false
-cache: bundler
+cache:
+  directories:
+    - ../rspec-core/bundle
+    - ../rspec-expectations/bundle
+    - ../rspec-mocks/bundle
+    - ../rspec-rails/bundle
+    - ../rspec-support/bundle
 before_install:
   - "script/clone_all_rspec_repos"
   # Downgrade bundler to work around https://github.com/bundler/bundler/issues/3004
   # Note this doesn't work on JRUBY 2.0.0 mode so we don't do it
   - if [ -z "$JRUBY_OPTS" ]; then gem install bundler -v=1.5.3 && alias bundle="bundle _1.5.3_"; fi
-bundler_args: "--binstubs --standalone --without documentation --path ../bundle"
+bundler_args: "--binstubs --standalone --without documentation --path bundle"
 script: "script/run_build"
 rvm:
   - 1.8.7

travis/script/functions.sh

@@ -8,8 +8,15 @@ SPECS_HAVE_RUN_FILE=specs.out
 MAINTENANCE_BRANCH=`cat maintenance-branch`
 
 function clone_repo {
-  if [ ! -d $1 ]; then # don't clone if the dir is already there
-    travis_retry eval "git clone git://github.com/rspec/$1 --depth 1 --branch $MAINTENANCE_BRANCH"
+  if [ ! -e $1/Gemfile ]; then # don't reclone
+    # deal with our bundler cache directory.
+    # Git won't clone into a non-empty dir so we have to move it aside and move it back.
+    mkdir -p $1/bundle
+    pushd $1
+    mv bundle ../$1-bundle
+    travis_retry eval "git clone git://github.com/rspec/$1 --depth 1 --branch $MAINTENANCE_BRANCH ."
+    mv ../$1-bundle bundle
+    popd
   fi;
 }
 
@@ -45,7 +52,7 @@ function run_cukes {
     else
       # Prepare RUBYOPT for scenarios that are shelling out to ruby,
       # and PATH for those that are using `rspec` or `rake`.
-      RUBYOPT="-I${PWD}/../bundle -rbundler/setup" \
+      RUBYOPT="-I${PWD}/bundle -rbundler/setup" \
          PATH="${PWD}/bin:$PATH" \
          bin/cucumber --strict
     fi
@@ -68,6 +75,7 @@ function run_spec_suite_for {
     bundle_install_flags=`cat .travis.yml | grep bundler_args | tr -d '"' | grep -o " .*"`
     travis_retry eval "bundle install $bundle_install_flags"
     run_specs_and_record_done
+    bundle clean # prep for travis caching
     popd
   fi;
 }