Added yarn support

Author: jfouse

bin/git_rails

@@ -76,17 +76,25 @@ files_changed=`git diff $old_ref $new_ref --name-status`
 # CHECK IF WE NEED TO DO A BUNDLE
 bundle_changed=`echo "$files_changed" | grep $'M\tGemfile.lock'`
 
+# CHECK IF WE NEED TO SPIN SOME YARN
+yarn_changed=`echo "$files_changed" | grep $'M\tyarn.lock'`
+
 migrations=`git diff --name-status $old_ref $new_ref -- db/migrate | grep '^[AD]'`
 
 if [ "$verbose" -eq 1 ]; then
-  if [ ! -z "$bundle_changed" ]; then
+  if [ ! -z "$bundle_changed" -o ! -z "$yarn_changed" ]; then
     echo -e "\nPrep needed:"
-    echo -e "\t- bundle"
+    if [ ! -z "$bundle_changed" ]; then
+      echo -e "\t- bundle"
+    fi
+    if [ ! -z "$yarn_changed" ]; then
+      echo -e "\t- yarn"
+    fi
   fi
   if [ ! -z "$migrations" ]; then
     echo -e "\nMigrations needed:\n${migrations}"
   fi
-  if [ -z "$bundle_changed" -a -z "$migrations" ]; then
+  if [ -z "$bundle_changed" -a -z "$yarn_changed" -a -z "$migrations" ]; then
     echo -e "\nNo changes necessary\n"
     exit 0
   fi
@@ -105,6 +113,11 @@ if [ ! -z "$bundle_changed" ]; then
   bundle
 fi
 
+if [ ! -z "$yarn_changed" ]; then
+  echo "Your yarn.lock has changed, running yarn"
+  yarn
+fi
+
 if [ ! -z "$migrations" ]; then
   echo "Running migrations!"
   for migration in $migrations