command-line utility that opens a browser to the given file/directory in GitHub.

github.sh

#!/bin/bash

FILE=$1
if [ -d $FILE ]; then
  DIR=$FILE
else
  DIR=`dirname $FILE`
fi

function parse_git_branch {
  local branch=`cd $DIR;git branch --no-color 2> /dev/null | sed -e '/^[^*]/d' -e 's/* \(.*\)/\1/'`
  if [ "$branch" == "" ]; then
    exit 1
  else
    echo $branch
  fi
}

function parse_github_repo {
  echo `cd $DIR;git config -l | grep 'remote.origin.url' | sed -En 's/remote.origin.url=git(@|:\/\/)github.com(:|\/)(.+)\/(.+).git/\3\/\4/p'`
}

function get_path {
  if [ -d $FILE ]; then
    FOO=`(cd $FILE; pwd)`
  else
    FOO=`(cd $DIR; pwd)`/`basename $FILE`
  fi

  PWD=`cd $DIR;cd $(git rev-parse --show-toplevel);pwd`
  LEN=${#PWD}
  LEN=$((LEN+1))

  echo ${FOO:LEN}
}

function tree_or_blob {
  if [ -d $FILE ]; then
    echo 'tree'
  else
    echo 'blob'
  fi
}

URL="https://github.com/$(parse_github_repo)/$(tree_or_blob)/$(parse_git_branch)/$(get_path)"

if [ "`which gnome-www-browser`" != "" ]; then
  gnome-www-browser $URL
else
  open $URL
fi

Exactly, I know pain when it's staring me in the face, so my word is legit. ;0