oh-my-zsh/plugins/pj/pj.plugin.zsh

alias pjo="pj open"

function pj () {
    cmd="cd"
    file=$1

    if [[ "open" == "$file" ]] then
        shift
        file=$*
        cmd=(${(s: :)EDITOR})
    else
        file=$*
    fi

    for project in $PROJECT_PATHS; do
        if [[ -d $project/$file ]] then
            $cmd "$project/$file"
            unset project # Unset project var
            return
        fi
    done

    echo "No such project $1"
}

function _pj () {
    # might be possible to improve this using glob, without the basename trick
    typeset -a projects
    projects=($PROJECT_PATHS/*)
    projects=$projects:t
    _arguments "*:file:($projects)"
}
compdef _pj pj