Merge pull request #388 from davemachado/feature/build-pull-requests

Validate PR updates exclusively

build/main.sh

 #!/bin/bash
+FORMAT_FILE=../README.md
+if [ "$TRAVIS_PULL_REQUEST" != "false" ]; then
+    echo "running on Pull Request #$TRAVIS_PULL_REQUEST"
+    git show | egrep "\+" > additions.txt
+    echo "--ADDITIONS--"
+    cat additions.txt
+    LINK_FILE=additions.txt
+else
+    echo "running on $TRAVIS_BRANCH branch"
+    LINK_FILE=../README.md
+fi
+
 echo "running format validation..."
-./validate_format.rb ../README.md
+./validate_format.rb $FORMAT_FILE
 if [[ $? != 0 ]]; then
     echo "format validation failed!"
     exit 1
@@ -10,11 +22,14 @@ fi
 
 if [ "$TRAVIS_BRANCH" == "master" ]; then
     echo "running link validation..."
-    ./validate_links.rb ../README.md
+    ./validate_links.rb $LINK_FILE
     if [[ $? != 0 ]]; then
         echo "link validation failed!"
         exit 1
     else
+        if [ "$TRAVIS_PULL_REQUEST" == "false" ]; then
+            echo "no links to check on $TRAVIS_BRANCH branch - script failure!"
+        fi
         echo "link validation passed!"
     fi
 fi

build/validate_links.rb

@@ -17,6 +17,10 @@ raw_links.each do |link|
         links.push(link)
     end
 end
+if links.length <= 0
+    puts "no links to check"
+    exit(0)
+end
 fails = []
 # Fail on any duplicate elements
 dup = links.select{|element| links.count(element) > 1}