Is there a Postgres admin GUI that can execute a master file containing multiple sql files

Question

I'm developing a really long script. I'd like to break the script into smaller, more manageable scripts and include each sql file in a master file, then just execute the master file.

example: master.sql

contents (I don't know the syntax to use):

file1.sql
file2.sql
file3.sql

I've found several tutorials about using psql -f in the command-line and \i to include these files, but the preference here is to avoid the terminal and use a GUI to manage my database and execute the master.sql script.

Is this possible in any postgres admin GUI? Presumably it's not in pgAdmin.