git-get-remote

#!/usr/bin/env bash

# Parse CLI arguments
REGEXES=()
POSITIONAL=()
while [[ $# -gt 0 ]]; do
    key=$1
    case $key in
        -r|--regex)
            REGEXES+=("$2")
            shift; shift; ;;
        -b|--branch)
            BRANCHES+=("$2")
            shift; shift; ;;
        *)
            # First positional argument is the remote name
            if [ -z $remote ]; then
                remote=$1
            else
                BRANCHES+=("$1")
            fi
            shift; ;;
    esac
done;

# Add default values to the CLI
BRANCHES+=('upstream')
BRANCHES+=('origin')

REGEXES+=('(git@github.com:)[^\/]+')
REGEXES+=('(https:\/\/github.com\/)[^\/]+')

# Find the base url of the first valid branch
for rname in ${BRANCHES[@]}; do
    if url=$(git remote get-url $rname 2>/dev/null); then
        base_url=$url
        break
    fi
done

if [ -z $base_url ]; then
    echo "Failed to find a valid branch"
    exit -1
fi

for regex in ${REGEXES[@]}; do
    output=$(echo $base_url | sed -rn s/$regex/\\1$remote/p)
    if [ ! -z $output ]; then
        echo $output
        exit 0
    fi
done
echo "No matching regular expressions for $base_url"
exit -2

BTW, the "hub" tool from GitHub is really good at these sort of shortcuts too.