Easily track and open the relevant github issue via branch naming convention (#46)

* Open issue using ‘git open issue’
* Update doc to reflect new functionality

README.md

@@ -6,6 +6,9 @@ browser.
 ## Usage
 
     git open [remote-name] [branch-name]
+    git open issue 
+
+(only implemented github support, feel free to fix the other ones.)
 
 ### Examples
 
@@ -18,6 +21,10 @@ browser.
     $ git open upstream master
     > open https://github.com/REMOTE_UPSTREAM_USER/CURRENT_REPO/tree/master
 
+    On a branch with the naming convention of issues/#123
+    $ git open issue
+    > open https://github.com/REMOTE_UPSTREAM_USER/CURRENT_REPO/issues/123
+
 ![git open2015-01-24 13_51_18](https://cloud.githubusercontent.com/assets/39191/5889192/244a0b72-a3d0-11e4-8ab9-55fc64228aaa.gif)
 
 ### Installation
@@ -32,6 +39,7 @@ You can use also `npm` to install this package:
 
     npm install --global git-open
 
+
 #### Using Windows Powershell
 
 Save git-open anywhere, say as ~/Documents/Scripts/git-open.sh and define

git-open

@@ -20,7 +20,18 @@ fi
 # fallback to upstream if neither is present.
 remote="origin"
 if [ -n "$1" ]; then
-  remote="$1"
+  if [ "$1" == "issue" ]; then
+    currentBranch=$(git symbolic-ref -q --short HEAD)
+    regex='^issue'
+    if [[ $currentBranch =~ $regex ]]; then
+      issue=${currentBranch#*#}
+    else
+      echo "'git open issue' expect branch naming to be issues/#123"
+      exit 0
+    fi
+  else
+    remote="$1"
+  fi
 fi
 
 remote_url="remote.${remote}.url"
@@ -94,7 +105,9 @@ else
 fi
 giturl=${giturl%\.git}
 
-if [ -n "$branch" ]; then
+if [ -n "$issue" ]; then
+  giturl="${giturl}/issues/${issue}"
+elif [ -n "$branch" ]; then
   giturl="${giturl}/${providerUrlDifference}/${branch}"
 fi