Open new iTerm tabs via command line

tab.bash

# tab function has been modified to integrate into basherk / bashrc file.
# dependant function/export taken from basherk https://github.com/traveaston/basherk
# assumes cd lists directory or has some other noisy output which we'd like to avoid here

# ignore commands with leading space
export HISTIGNORE=" *:$HISTIGNORE"

# credit: https://stackoverflow.com/a/17841619
# this solution avoids appending/prepending delimiter to final string
function array_join() {
    [[ -z $1 ]] || [[ $1 == "--help" ]] && {
        echo "Join array elements with a (multi-character) delimiter"
        echo "Usage:"
        echo "    array_join [--help]"
        echo "    array_join delimiter \${array[@]}"
        return
    }

    # capture delimiter in variable and remove from arguments array
    local delimiter="$1"
    shift

    # echo first array element to avoid prepending it with delimiter
    echo -n "$1"
    shift

    # prepend each element with delimiter
    printf "%s" "${@/#/$delimiter}"
}

[[ $os == "macOS" ]] && {
    # credit Justin Hileman - original (http://justinhileman.com)
    # credit Vitaly (https://gist.github.com/vitalybe/021d2aecee68178f3c52)
    function tab() {
        [[ $1 == "--help" ]] && {
            echo "Open new iTerm tabs from the command line"
            echo "Usage:"
            echo "    tab                   Opens the current directory in a new tab"
            echo "    tab [PATH]            Open PATH in a new tab (includes symlinks)"
            echo "    tab [CMD]             Open a new tab and execute CMD (also sets tab title)"
            echo "    tab [PATH] [CMD] ...  You can prob'ly guess"
            return
        }

        local commands=()
        local path="$PWD" path_test
        local exec_set_title exec_commands user_command

        # test if we can cd into $1, and capture as $path if so.
        # this way we can handle cases where you're inside a symlinked folder,
        # but [[ -d ../foo ]] actaully references the literal parent folder
        # more info: https://github.com/traveaston/basherk/commit/3c01046
        path_test=$(if command cd "$1" >/dev/null 2>&1; then pwd; fi;)
        if [[ -n $path_test ]]; then
            path="$path_test"
            shift
        fi

        user_command="$*"

        # no need to cd if goal is home directory
        [[ $path != "$HOME" ]] && {
            commands+=("command cd '$path'")
        }

        commands+=("clear" "pwd")

        [[ -n $user_command ]] && {
            exec_set_title="set_title '$user_command'"
            commands+=("$user_command")
            commands+=("set_title")
        }

        exec_commands=$(array_join "; " "${commands[@]}")

        # osascript 2-space indentation due to deep nesting
        osascript &>/dev/null <<EOF
          tell application "iTerm"
            tell current window
              set newTab to (create tab with default profile)
              tell newTab
                tell current session
                  write text " $exec_set_title"
                  write text " $exec_commands"
                end tell
              end tell
            end tell
          end tell
EOF
    }
}