add caching

.travis.yml

@@ -10,6 +10,13 @@ virtualenv:
 
 cache:
   apt: true
+  directories:
+    - $HOME/miniconda
+addons:
+  apt:
+    packages:
+    - clang
+    - gdb
 
 sudo: true
 
@@ -52,24 +59,9 @@ matrix:
         - python: 2.7
           env: SETUP_CMD='test'
 
-addons:
-  apt:
-    packages:
-    - clang
-    - gdb
-
-
-
-
 before_install:
     # We do this to make sure we get the dependencies so pip works below
-    - export PYTHONIOENCODING=UTF8
-    - wget $MINICONDA_URL -O miniconda.sh
-    - chmod +x miniconda.sh
-    - bash miniconda.sh -b -p $HOME/miniconda
-    - export PATH=$HOME/miniconda/bin:$PATH
-    - hash -r
-    - conda update --yes conda
+    - source ci-helpers/install_miniconda.sh
     - if [[ $TEST_MODE == 'spectrum' ]]; then conda install -c conda-forge git-lfs=2.2.1 -y; fi
     - if [[ $TEST_MODE == 'spectrum' ]]; then git lfs install --skip-smudge; fi
     - if [[ $TEST_MODE == 'spectrum' ]]; then git clone $TARDIS_REF_DATA_URL $HOME/tardis-refdata; fi

ci-helpers/install_miniconda.sh

@@ -0,0 +1,11 @@
+export PYTHONIOENCODING=UTF8
+if test -e $HOME/miniconda/bin; then
+     echo "miniconda already installed.";
+else
+    wget $MINICONDA_URL -O miniconda.sh
+    chmod +x miniconda.sh
+    bash miniconda.sh -b -p $HOME/miniconda
+    export PATH=$HOME/miniconda/bin:$PATH
+    hash -r
+    conda update --yes conda
+fi