Break script into parts and travis_retry optional installs

.travis.yml

@@ -15,6 +15,9 @@ python:
 - 3.4
 
 before_install:
+    - export DISPLAY=:99.0
+    - export PYTHONWARNINGS="all"
+    - export WHEELHOUSE="--no-index --find-links=http://wheels.scikit-image.org/"
     - travis_retry tools/travis_setup.sh
 
 install:
@@ -22,6 +25,13 @@ install:
     - python setup.py install
 
 script:
+    - tools/header.py "Run all tests with minimum dependencies"
+    - nosetests --exe -v skimage
+
+    - tools/header.py "Pep8 and Flake tests"
+    - flake8 --exit-zero --exclude=test_*,six.py skimage doc/examples viewer_examples
+
+    - travis_retry tools/travis_install_optional.sh
     - tools/travis_test.sh
 
 after_success:

tools/travis_install_optional.sh

@@ -0,0 +1,38 @@
+#!/usr/bin/env bash
+set -ex
+
+tools/header.py "Install optional dependencies"
+
+# Install Qt and then update the Matplotlib settings
+if [[ $TRAVIS_PYTHON_VERSION == 2.7* ]]; then
+    sudo apt-get install -q python-qt4
+    MPL_QT_API=PyQt4
+    MPL_DIR=$HOME/.matplotlib
+    export QT_API=pyqt
+
+else
+    sudo apt-get install -q libqt4-dev
+    pip install PySide $WHEELHOUSE
+    python ~/virtualenv/python${TRAVIS_PYTHON_VERSION}/bin/pyside_postinstall.py -install
+    MPL_QT_API=PySide
+    MPL_DIR=$HOME/.config/matplotlib
+    export QT_API=pyside
+fi
+
+# imread does NOT support py3.2
+if [[ $TRAVIS_PYTHON_VERSION != 3.2 ]]; then
+    sudo apt-get install -q libtiff4-dev libwebp-dev libpng12-dev xcftools
+    pip install imread
+fi
+
+# TODO: update when SimpleITK become available on py34 or hopefully pip
+if [[ $TRAVIS_PYTHON_VERSION != 3.4 ]]; then
+    easy_install SimpleITK
+fi
+
+sudo apt-get install libfreeimage3
+pip install astropy
+
+if [[ $TRAVIS_PYTHON_VERSION == 2.* ]]; then
+    pip install pyamg
+fi

tools/travis_setup.sh

@@ -4,8 +4,6 @@ set -ex
 sh -e /etc/init.d/xvfb start
 sudo apt-get update
 
-WHEELHOUSE="--no-index --find-links=http://wheels.scikit-image.org/"
-
 pip install wheel flake8 coveralls nose
 pip uninstall -y numpy
 

tools/travis_test.sh

@@ -1,74 +1,6 @@
 #!/usr/bin/env bash
 set -ex
 
-
-export DISPLAY=:99.0
-export PYTHONWARNINGS="all"
-WHEELHOUSE="--no-index --find-links=http://wheels.scikit-image.org/"
-
-tools/header.py "Run all tests with minimum dependencies"
-nosetests --exe -v skimage
-
-tools/header.py "Pep8 and Flake tests"
-flake8 --exit-zero --exclude=test_*,six.py skimage doc/examples viewer_examples
-
-tools/header.py "Install optional dependencies"
-
-#  http://unix.stackexchange.com/a/82615
-function retry()
-{
-        local n=0
-        local try=$3
-        local cmd="${@: 1}"
-        [[ $# -le 1 ]] && {
-        echo "Usage $0 <Command>"; }
-
-        until [[ $n -ge $try ]]
-        do
-                $cmd && break || {
-                        echo "Command Fail.."
-                        ((n++))
-                        echo "retry $n ::"
-                        sleep 1;
-                        }
-
-        done
-}
-
-# Install Qt and then update the Matplotlib settings
-if [[ $TRAVIS_PYTHON_VERSION == 2.7* ]]; then
-    retry sudo apt-get install -q python-qt4
-    MPL_QT_API=PyQt4
-    MPL_DIR=$HOME/.matplotlib
-    export QT_API=pyqt
-
-else
-    retry sudo apt-get install -q libqt4-dev
-    retry pip install PySide $WHEELHOUSE
-    retry python ~/virtualenv/python${TRAVIS_PYTHON_VERSION}/bin/pyside_postinstall.py -install
-    MPL_QT_API=PySide
-    MPL_DIR=$HOME/.config/matplotlib
-    export QT_API=pyside
-fi
-
-# imread does NOT support py3.2
-if [[ $TRAVIS_PYTHON_VERSION != 3.2 ]]; then
-    retry sudo apt-get install -q libtiff4-dev libwebp-dev libpng12-dev xcftools
-    retry pip install imread
-fi
-
-# TODO: update when SimpleITK become available on py34 or hopefully pip
-if [[ $TRAVIS_PYTHON_VERSION != 3.4 ]]; then
-    retry easy_install SimpleITK
-fi
-
-retry sudo apt-get install libfreeimage3
-retry pip install astropy
-
-if [[ $TRAVIS_PYTHON_VERSION == 2.* ]]; then
-    retry pip install pyamg
-fi
-
 # Matplotlib settings - do not show figures during doc examples
 mkdir -p $MPL_DIR
 touch $MPL_DIR/matplotlibrc