diff --git a/github.sh b/github.sh
index 64741b9..4799f1c 100755
--- a/github.sh
+++ b/github.sh
@@ -6,12 +6,33 @@
 # description:
 #  GitHub API Client
 #
+
 set -e
 set -o pipefail
 
+function get_realpath() {
+
+    link="$1"
+	while [ -L "$link" ]; do
+	  lastLink="$link"
+	  link=$(/bin/ls -ldq "$link")
+	  link="${link##* -> }"
+	  link=$(realpath "$link")
+	  [ "$link" == "$lastlink" ] && >&2 echo -e "ERROR: link loop detected on $link" && return 1 # error
+	done
+	
+	echo $link
+	
+    return 0 # success
+}
+
+
 # include files
 
-. ${BASH_SOURCE[0]%/*}/lib/initializer.sh
+BASENAME=$(cd $(dirname "$(get_realpath $0)") && pwd -P)
+
+
+. ${BASENAME}/lib/initializer.sh
 
 # main
 
diff --git a/lib/v3.d/pulls.sh b/lib/v3.d/pulls.sh
index a4a0ec5..f808339 100644
--- a/lib/v3.d/pulls.sh
+++ b/lib/v3.d/pulls.sh
@@ -5,10 +5,21 @@
 
 task_list() {
   # http://developer.github.com/v3/pulls/#list-pull-requests
-  local owner=$1 repo=$2
+  local owner=$1 repo=$2 state=$3 page=$4
+
+  call_api -X GET \
+    "$(base_uri)/repos/${owner}/${repo}/pulls?$(query_string \
+    $(add_param state         string optional) \
+    $(add_param page          string optional) \
+  )"
+}
+
+task_diff() {
+  # http://developer.github.com/v3/pulls/#get-a-single-pull-request
+  local owner=$1 repo=$2 number=$3
 
   call_api -X GET \
-   $(base_uri)/repos/${owner}/${repo}/pulls?state=${state:-open}
+   $(base_uri)/repos/${owner}/${repo}/pulls/${number}/files
 }
 
 task_get() {