feat: Update file templates

templates/Makefile

@@ -0,0 +1,24 @@
+# vim: foldmarker={{{,}}}:foldmethod=marker
+
+# SPDX-FileCopyrightText: 2021 Robin Schneider <ypid@riseup.net>
+#
+# SPDX-License-Identifier: AGPL-3.0-or-later
+
+SHELL ?= /bin/bash -o nounset -o pipefail -o errexit
+MAKEFLAGS += --no-builtin-rules
+.SUFFIXES:
+
+#-# Help {{{
+#-# https://stackoverflow.com/a/26339924/2239985
+.PHONY: list
+list:
+	@if command -v mmake >/dev/null 2>&1; then \
+		mmake help; \
+	else \
+		echo "This Makefile has the following targets:"; \
+		$(MAKE) -pRrq -f $(firstword $(MAKEFILE_LIST)) / 2>/dev/null | awk -v RS= -F: '/^# File/,/^# Finished Make data base/ {if ($$1 !~ "^[#.]") {print $$1}}' | egrep -v -e '^[^[:alnum:]]' -e '^$@$$' | sed 's/^/    /' | sort; \
+	fi
+#-# }}}
+
+test:
+	@echo "Do something." 1>&2

templates/bash_simple_script_template

@@ -5,9 +5,16 @@
 #
 # SPDX-License-Identifier: AGPL-3.0-or-later
 
-PS4='+ $(date --rfc-3339=seconds), ${BASH_SOURCE-}:${LINENO-}: '
-export PS4
-trap 'echo Encountered an unexpected error. Exiting with exit code $? in ${BASH_SOURCE-}:${LINENO-}. >&2' ERR
-set -o nounset -o pipefail -o errexit -o errtrace
+function main() {
+    echo "Actual script starts here."
+}
 
-echo "Actual script starts here."
+if [[ "${BASH_SOURCE[0]}" == "${0}" ]]
+then
+    PS4='+ $(date --rfc-3339=seconds), ${BASH_SOURCE-}:${LINENO-}: '
+    export PS4
+    trap 'echo Encountered an unexpected error. Exiting with exit code $? in ${BASH_SOURCE-}:${LINENO-}. >&2' ERR
+    set -o nounset -o pipefail -o errexit -o errtrace
+
+    main "$@"
+fi

templates/python3_simple_script_template

@@ -0,0 +1,31 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+#
+# SPDX-FileCopyrightText: 2021 Robin Schneider <ypid@riseup.net>
+#
+# SPDX-License-Identifier: AGPL-3.0-or-later
+
+"""
+TODO: Use the docstring to give a short description of what the script does.
+This is automatically included in the help text. Remove the following reference
+to the template itself from the docstring.
+"""
+
+import argparse
+
+__version__ = '0.1.0'
+
+
+def main():
+    args_parser = argparse.ArgumentParser(description=__doc__)
+    args_parser.add_argument('-H', '--host', required=True)
+    args_parser.add_argument(
+        '-V', '--version', action='version',
+        version='%(prog)s {}'.format(__version__))
+    cli_args = args_parser.parse_args()
+
+    print(cli_args.host)
+
+
+if __name__ == '__main__':
+    main()