bootstrap-hooks

#!/usr/bin/env sh

# (C) Copyright 2021 Hewlett Packard Enterprise Development LP.
# Apache License 2.0

# editing a script while it runs
# may cause problems because the shell reads it line by line
# when all commands are outside functions
# so here all the blocks are wrapped to avoid that
# should someone want to add something to their local hook

set_hooks_settings() {
	git config hooks.verbose false

	cat <<- EOF
	by default, the hooks will NOT use verbose output
	if you want hooks in this repository to use verbose output
	you can run

	  git config hooks.verbose true
	EOF
}

install_hooks() {
	# use local for variable that won't be shared
	local base_dir
	base_dir=$(git rev-parse --show-toplevel)

	for filename in ${base_dir}/.hooks/*; do
		rm -f "$base_dir/.git/hooks/$(basename "$filename")"
		ln -s "$filename" "${base_dir}/.git/hooks/"
		git update-index --assume-unchanged "$filename"
	done

	cat <<- EOF

	by default, these hooks will be ignored (but may still affected by git reset)
	if you want to see when the hooks change, run

	  cd $(git rev-parse --show-toplevel)
	  git update-index --no-assume-unchanged .hooks/*
	  cd -
	EOF
}

spin() {
	while :; do
		for c in / - \\ \|; do
			printf '%s\b' "$c"
			[ "$END_SPIN" = "true" ] && { break 2; }
			sleep 1
		done
	done
	printf '\n'
}

install_tools() {
	[ -d "$HOME/.bintools" ] && return 0
	cat <<- EOF

	installing tools
	EOF
	# start a spinner while installing the tools
	spin &
	SPIN_PID=$!
	# set a trap for the spinner to end when receiving any signal
	# including this script ending
	trap 'kill -9 "$SPIN_PID"' $(seq 0 15)
	(
		virtualenv -p python3.7 "$HOME/.bintools"
		. "$HOME/.bintools/bin/activate"
		python -m pip install flake8
		python -m pip install black
		deactivate
	) > /dev/null 2>&1
	END_SPIN="true"
	[ -d "$HOME/.hookbin" ] && return 0
	(
		mkdir -p "$HOME/.hookbin"
		cd "$HOME/.hookbin"
		ln -s "$HOME/.bintools/bin/flake8" .
		ln -s "$HOME/.bintools/bin/black" .
	) > /dev/null 2>&1
}

set_new_path_section() {
	grep -q hookbin "$HOME/.bashrc" && return 0
	cat <<- EOF >> "$HOME/.bashrc"

	# set by pyaoscx's bootstrap-hooks
	[ -d \$HOME/.hookbin ] && export PATH="\$HOME/.hookbin:\$PATH"

	EOF
}

main() {
	set_hooks_settings

	install_hooks

	install_tools

	set_new_path_section
}

main