Unstall other bundler versions

Author: kpaulisse

.travis.yml

@@ -5,8 +5,7 @@ install: true
 script: "script/cibuild"
 
 before_install:
-  - gem uninstall --force bundler
-  - gem install bundler -v 1.15.4
+  - "script/travis-before-install"
 
 matrix:
   include:

script/travis-before-install

@@ -0,0 +1,15 @@
+#!/bin/bash
+
+# Script runs before travis CI builds.
+
+set -ex
+DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && cd .. && pwd )"
+
+cd "$DIR"
+DESIRED_BUNDLER_VERSION=$(grep "add_development_dependency 'bundler'" octocatalog-diff.gemspec  | cut -d"'" -f4)
+gem install bundler -v "$DESIRED_BUNDLER_VERSION"
+
+BUNDLER_VERSIONS=$(gem list bundler | grep ^bundler | cut -d'(' -f2 | cut -d')' -f1 | tr "," " ")
+for v in $BUNDLER_VERSIONS; do
+  if [ "$v" != "$DESIRED_BUNDLER_VERSION" ]; then gem uninstall bundler --force -v "$v"; fi
+done