[#456] Adding Travis CI

.travis.yml

@@ -0,0 +1,13 @@
+sudo: false
+language: erlang
+otp_release:
+  - 19.2
+before_install:
+  - ./ci before_install "${PWD:?}"/rebar3
+install:
+  - ./ci install "${PWD:?}"/rebar3
+script:
+  - ./ci script "${PWD:?}"/rebar3
+cache:
+  directories:
+    - .plt

README.md

@@ -2,7 +2,7 @@
 
 ![](http://www.reactiongifs.com/wp-content/uploads/2013/01/elvis-dance.gif)
 
-# elvis
+# elvis [![Build Status](https://travis-ci.org/inaka/elvis.svg?branch=master)](https://travis-ci.org/inaka/elvis)
 
 Command-line interface for Elvis, the Erlang style reviewer.
 

ci

@@ -0,0 +1,21 @@
+#!/bin/bash
+
+set -ev # Ref https://docs.travis-ci.com/user/customizing-the-build/#Implementing-Complex-Build-Steps
+
+case "${1:?}" in
+    before_install)
+        ## Travis CI does not support rebar3 yet. See https://github.com/travis-ci/travis-ci/issues/6506#issuecomment-275189490
+        Rebar3="${2:?}"
+        curl -f -L -o "${Rebar3:?}" https://github.com/erlang/rebar3/releases/download/3.3.5/rebar3
+        chmod +x "${Rebar3:?}"
+        ;;
+    install)
+        Rebar3="${2:?}"
+        "${Rebar3:?}" deps
+        "${Rebar3:?}" dialyzer -u true -s false
+        ;;
+    script)
+        Rebar3="${2:?}"
+        "${Rebar3:?}" ct
+        ;;
+esac