GCO

gco.sh

#!/bin/bash

# Validate the input
if [ "$#" -ne 1 ]; then
    printf "Enter a branch number only\n"
    exit
fi

# Special case if the argument is "-"
if [ $1 = "-" ];
then
    git checkout -
    exit
fi

function checkout {

    # Check how many branches with that number exist
    num_branches=$(echo $branch | wc -w)
    if [ "$num_branches" -gt 1 ];
    then
        printf "Too many branches exist:\n\n$branch"
        printf "\n\nTry being more specific\n"
    else
        # Strip off remotes/origin/ prefix if necessary
        if [[ $branch == remotes/origin/* ]]
        then
            branch=${branch#remotes/origin/}
        fi
        
        # Check that no local changes exist before switching branches
        changed_files=$(git status --porcelain --untracked-files=no | wc -l)
        
        # Check that we are not already on the branch
        if [ "$current_branch" = "$branch" ];
        then
            printf "Already checked out $branch\n"

        #elif [ $changed_files -gt 0 ];
        #then
        #    printf "Uncommitted changes detected. Try stashing or committing first.\n"

        else
            git checkout $branch
        fi
    fi

}

current_branch="$(git rev-parse --abbrev-ref HEAD)"
branch=$(git branch -a | grep -v remotes | grep -e $1 | tr -d " *")
remote_branch=$(git branch -a | grep remotes | grep -e $1 | tr -d " *")

if [ -n "$branch" ];
then
    checkout
elif [ -n "$remote_branch" ];
then
    branch=$remote_branch
    checkout
else
    printf "Could not find branch containing $1\n"
fi

Wonderful.