Add a .travis.yml file

This allows automatically building and running tests on Travis for every commit
and pull request. Travis will build four different configurations which differ
in the Lua version that is being used: Lua 5.1, 5.2, 5.3 and LuaJIT are tested.

Lua 5.1 and Lua 5.2 are installed from the Ubuntu package repository.

Lua 5.3.3 and latest LuaJIT git are built manually. For Lua 5.3, additional
asserts are enabled to catch API mis-use (e.g. lua_pop() on an empty stack).

This .travis.yml is loosely based on the same file in awesomeWM's git
repository.

Signed-off-by: Uli Schlachter <psychon@znc.in>

.travis.yml

@@ -0,0 +1,59 @@
+sudo: required
+dist: trusty
+language: c
+env:
+  matrix:
+    - LUA=5.1 LUANAME=luajit-2.0
+    - LUA=5.1 LUANAME=lua5.1
+    - LUA=5.2 LUANAME=lua5.2
+    - LUA=5.3 LUANAME=lua5.3
+
+before_install:
+  - if [ -z $LUAINCLUDE ]; then LUAINCLUDE=/usr/include/${LUANAME}; fi
+
+install:
+  # Travis boilerplate: the apt-get cache might be out of date.
+  - travis_retry sudo apt-get update -qq
+
+  # Do not install recommended packages with apt-get.
+  - echo 'APT::Install-Recommends "false";' | sudo tee /etc/apt/apt.conf.d/no-recommends
+
+  # Install build dependencies
+  - travis_retry sudo apt-get install -y libgirepository1.0-dev libcairo2-dev gir1.2-gtk-3.0 libffi-dev libglib2.0-dev
+  # And dependencies for running tests
+  - travis_retry sudo apt-get install -y xvfb
+
+  # Install Lua (per env).
+  # Note that Lua 5.3 is installed manually, because it is not available in Ubuntu Trusty.
+  # For this we enable LUA_USE_APICHECK to catch errors in Lua API use.
+  # LuaJIT is also installed manually.
+  - |
+    set -ev
+    if [[ "$LUA" == "5.3" ]]; then
+      travis_retry wget https://github.com/lua/lua/releases/download/5.3.3/lua-5.3.3.tar.gz -O lua.tar.gz
+      tar -xvzf lua.tar.gz
+      (cd lua-5.3.3/src \
+        && make SYSCFLAGS="-DLUA_USE_LINUX -ULUA_COMPAT_5_2 -DLUA_USE_APICHECK" SYSLIBS="-Wl,-E -ldl -lreadline" LUA_A=liblua.so MYCFLAGS="-fPIC" RANLIB=: AR="gcc -shared -ldl -o" liblua.so \
+        && cd .. \
+        && sudo make INSTALL_TOP=/usr/ INSTALL_INC=${LUAINCLUDE} TO_LIB=liblua.so linux install)
+    elif [[ "$LUANAME" == "luajit-2.0" ]]; then
+      travis_retry git clone http://luajit.org/git/luajit-2.0.git
+      (cd luajit-2.0 && sudo make install PREFIX=/usr)
+
+      # "Create" /usr/bin/lua if needed (Yup, this is a bad hack)
+      if [ ! -e "/usr/bin/lua" ]; then sudo ln -s /usr/bin/luajit /usr/bin/lua; fi
+    else
+      sudo apt-get install -y lib${LUANAME}-dev ${LUANAME}
+    fi
+
+
+script:
+  # The tests need an enum value that is new in version 2.44. Of course Ubuntu
+  # Ancient (=Trusty) as used by Travis only has version 2.40.0.
+  - sed -e 's/Gio.NetworkConnectivity.LOCAL/1/' -i tests/gobject.lua
+
+  # Build everything and run the tests
+  - xvfb-run make check LUA_CFLAGS="-I$LUAINCLUDE"
+
+  # Just to also check make install
+  - sudo make install