Run tests on an isolated docker environment

- Install fish from dockerfile and generate a docker image.
- Install Oh My Fish! from downloaded git repository and generate a
  docker image.

.travis.yml

-language: c
-os:
-- linux
-sudo: false
-addons:
-  apt:
-    packages:
-    - bc
-    - doxygen
-    - expect
-    - gettext
-    - libncurses5-dev
-    - tree
+sudo: required
+
+services:
+  - docker
 
 env:
   global:
-    - PATH="$HOME/fish/bin:$PATH"
     - OMF_REPO_URI="https://github.com/$TRAVIS_REPO_SLUG"
     - OMF_REPO_BRANCH="$TRAVIS_BRANCH"
 
 before_install:
-  - tools/travis_install_fish.sh
+  - docker build -t fish . < Dockerfile
 
-before_script: pwd; tree -h
+before_script:
+  - docker run -e 'CI=WORKAROUND' -e "OMF_REPO_URI=$OMF_REPO_URI" -e "OMF_REPO_BRANCH=$OMF_REPO_BRANCH" -t -v $PWD:/src/oh-my-fish fish /usr/bin/fish -c "/src/oh-my-fish/bin/install"
+  - docker ps -a -q | xargs -i docker commit {} oh-my-fish
+  - docker run -t -w "/root/.local/share/omf" oh-my-fish /usr/bin/fish -c "export; tree -h"
 
 script:
-  - /bin/sh tools/travis_install_omf.sh
-  - tests/test_runner.fish
-  - tests/test-generate-themes-doc.fish
-
-after_script:
-  - cd ~/.config/fish; tree -h; find . -type f | xargs cat
-
-cache:
-  directories:
-    - $HOME/fish
+  - docker run -t -w "/root/.local/share/omf" oh-my-fish /usr/bin/fish "tests/test_runner.fish"
+  - docker run -t -w "/root/.local/share/omf" oh-my-fish /usr/bin/fish "tests/test-generate-themes-doc.fish"
 
 notifications:
   email:

tools/travis_install_fish.sh

-#!/bin/sh
-set -e
-BINDIR=$HOME/fish/bin
-# check to see if fish bin doesn't exist
-if [ ! -x "$BINDIR/fish" ]; then
-  cd /tmp
-  wget -O - https://github.com/fish-shell/fish-shell/releases/download/2.2.0/fish-2.2.0.tar.gz | tar xzv
-  cd fish-2.2.0 && ./configure --prefix=$HOME/fish && make -j2 && make install;
-  strip $BINDIR/fish $BINDIR/fish_indent $BINDIR/mimedb
-else
-  echo 'Using cached directory.';
-fi

tools/travis_install_omf.sh

-#!/bin/sh
-
-git () {
-  case $1 in
-    clone)
-      command git "$@"
-      if test "$TRAVIS_PULL_REQUEST" != "false"; then
-        echo "! detecting a pull request !"
-	echo "$ git -C $OMF_PATH fetch origin +refs/pull/$TRAVIS_PULL_REQUEST/merge:"
-	git -C $OMF_PATH fetch origin +refs/pull/$TRAVIS_PULL_REQUEST/merge:
-        echo "$ git -C $OMF_PATH checkout -qf FETCH_HEAD"
-        git -C $OMF_PATH checkout -qf FETCH_HEAD
-      fi
-      ;;
-    *)
-      command git "$@"
-      ;;
-  esac
-}
-
-. $TRAVIS_BUILD_DIR/bin/install