output and open GitHub URL for current/pointed directory/file

github.bash

#!/usr/bin/env bash

BASEREPO="$(git remote -v | grep fetch | head -1 | cut -f2 | cut -d' ' -f1 | sed -e's/git@/http:\/\//' -e's/\.git$//' | sed -E 's/(\/\/[^:]*):/\1\//')"
BASEREPO="${BASEREPO}"

CURRENTBRANCH="$(git branch | grep \* | cut -d ' ' -f2)"
CURRENTBRANCH="${CURRENTBRANCH}"

BASEPATH="$(git rev-parse --show-toplevel)"
BASEPATH="${BASEPATH}"

ABSOLUTEPATH="$(pwd)"
ABSOLUTEPATH="${ABSOLUTEPATH}"

RELATIVEPATH=${ABSOLUTEPATH#"$BASEPATH"}
RELATIVEPATH=${RELATIVEPATH%"$BASEPATH"}

if [ -n $1 ]
then
FILE=$1
FILE="/${FILE}"
fi

echo "${BASEREPO}/tree/${CURRENTBRANCH}${RELATIVEPATH}${FILE}"
open "${BASEREPO}/tree/${CURRENTBRANCH}${RELATIVEPATH}${FILE}"