👷 Travis: Add caching for tmux builds and pip, add tmux 2.9 + 3.0a (#527)

Author: tony

.travis.yml

@@ -1,17 +1,20 @@
 language: python
 sudo: false
+dist: bionic  # 18.04
 python:
   - 2.7
   - 3.6
   - 3.7
-  - pypy
   - pypy3
 if: (type = push AND branch IN (master)) OR (type = pull_request)
 env:
   global:
     - RETRY_TIMEOUT_SECONDS=15
   matrix:
     - TMUX_VERSION=master
+    - TMUX_VERSION=3.0a
+    - TMUX_VERSION=2.9
+    - TMUX_VERSION=2.8
     - TMUX_VERSION=2.8
     - TMUX_VERSION=2.7
     - TMUX_VERSION=2.6
@@ -26,7 +29,11 @@ env:
 matrix:
   allow_failures:
   - env: TMUX_VERSION=master
-
+cache:
+  - pip
+  - directories:
+    - ~/source
+    - ~/build
 before_install:
   - export PIP_USE_MIRRORS=true
   - pip install --upgrade pytest  # https://github.com/travis-ci/travis-ci/issues/4873
@@ -36,13 +43,15 @@ install:
   - pip install -e .
   - pip install -r requirements/test.txt
 before_script:
-  - git clone https://github.com/tmux/tmux.git tmux
-  - cd tmux
+  - mkdir -p ~/source
+  - mkdir -p ~/build/tmux-$TMUX_VERSION
+  - if [[ ! -d ~/source/tmux-$TMUX_VERSION ]]; then git clone https://github.com/tmux/tmux.git ~/source/tmux-$TMUX_VERSION; fi
+  - cd ~/source/tmux-$TMUX_VERSION
   - git checkout $TMUX_VERSION
-  - sh autogen.sh
-  - ./configure --prefix=$HOME/tmux && make && make install
-  - export PATH=$HOME/tmux/bin:$PATH
-  - cd ..
+  - export PATH=$HOME/build/tmux-$TMUX_VERSION/bin:$PATH
+  - if [[ $TMUX_VERSION == "master" || ! $(tmux -V | grep $TMUX_VERSION) ]]; then sh autogen.sh; fi
+  - if [[ $TMUX_VERSION == "master" || ! $(tmux -V | grep $TMUX_VERSION) ]]; then ./configure --prefix=$HOME/build/tmux-$TMUX_VERSION && make && make install; fi
+  - cd $TRAVIS_BUILD_DIR
   - tmux -V
 script:
   - py.test --cov