Python script that generates a simple application that executes a script.

scriptAppGenerator.py

#!/usr/bin/env python3

from os import chmod, makedirs, stat, system
from stat import S_IXGRP, S_IXOTH, S_IXUSR
from sys import argv

# Application info
APP_NAME = "Test"
VERSION = "1.0.0"
BUNDLE_IDENTIFIER = f"io.github.aerobounce.{APP_NAME}"
COPYRIGHT = "Copyright © 2020 aerobounce. All rights reserved."

# Script that the app generated will execute
MAIN_SCRIPT = """#!/usr/bin/env swift
print("Hello World!")
"""

# Paths
CWD = "/".join(argv[0].split("/")[:-1])
APP_PACKAGE = CWD + f"/{APP_NAME}.app"
BINARY = APP_PACKAGE + f"/Contents/MacOS/{APP_NAME}"

# Info.plist
#
# Other useful keys can be used here, such as:
# CFBundleDocumentTypes, UTImportedTypeDeclarations,
# NSAppleScriptEnabled, LSUIElement ...
#
PLIST = f"""<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
    <key>CFBundleDevelopmentRegion</key>
    <string>English</string>
    <key>CFBundleExecutable</key>
    <string>{APP_NAME}</string>
    <key>CFBundleIdentifier</key>
    <string>{BUNDLE_IDENTIFIER}</string>
    <key>CFBundleInfoDictionaryVersion</key>
    <string>6.0</string>
    <key>CFBundleName</key>
    <string>{APP_NAME}</string>
    <key>CFBundlePackageType</key>
    <string>APPL</string>
    <key>CFBundleShortVersionString</key>
    <string>{APP_NAME + " " + VERSION}</string>
    <key>CFBundleVersion</key>
    <string>{VERSION}</string>
    <key>NSHumanReadableCopyright</key>
    <string>{COPYRIGHT}</string>
</dict>
</plist>
"""


def main():
    _ = system(f"rm -rf {APP_PACKAGE}")
    makedirs(APP_PACKAGE + "/Contents/MacOS")

    with open(APP_PACKAGE + "/Contents/Info.plist", "w") as f:
        _ = f.write(PLIST)

    with open(APP_PACKAGE + "/Contents/PkgInfo", "w") as f:
        _ = f.write("APPL????")

    with open(BINARY, "w") as f:
        _ = f.write(MAIN_SCRIPT)

    old_mode = stat(BINARY).st_mode
    chmod(BINARY, old_mode | S_IXUSR | S_IXGRP | S_IXOTH)


main()