PKGBUILD: generate git submodule configuration.

git_submodule_PKGBUILD_conf.sh

#!/bin/bash
# shellcheck disable=SC2164,SC2154 # mask unsafe cd and uninitialized variables warings
shopt -s globstar

# How to use:
# * run in PKGBUILD dir or pass path to PKGBUILD as argument
#     this will generate volatile source tree in $TMP (default: /tmp) and
#     generate source array and prepare_submodule() function to init them
# * add local=1 env var to use src/ dir in PKGBUILD path instead of $TMP
# * add remote=1 env var to update module past the pined commit hash
# * redirect stdout `>> PKGBUILD` to append generated script

# to do:
# * handle $srcdir
# * auto update PKGBUILD
# * handle source[]
# * handle checksums
# ✓ find all .gitmodules
# ✓ make sure noting goes to the stdout beside output script


[[ -f "${1:-$PWD}/PKGBUILD" ]] || {
	echo -e "usage: $(basename "$0") run inside directory containing PKGBUILD or pass path as argument" >&2
	exit 1
}
[[ -v 1 ]] && cd "$1"

if (( local )); then 
	cd src || { echo -e "usage: $(basename "$0") in local mode first run \`makepkg -Cod\`" >&2; exit 2; }
else
	export BUILDDIR=${TMP:-/tmp}/aur_git_submodule_$$
	trap 'rm -rf "$BUILDDIR"' exit
	makepkg -Cod --noprepare >&2
	cd "$BUILDDIR"/*/src
fi

while read -r gitmodule; do
	while read -r submodule; do
		prepare+=("  git -C \"\$srcdir/${gitmodule%/.gitmodules}\" -c protocol.file.allow=always config ${submodule% *} \"\$srcdir/${submodule##*/}\"")
		source+=("  \"${submodule##*/}::git+${submodule#* }\"")
	done < <(git config --file "$gitmodule" --get-regex url|sed 's/\.git$//')
	prepare+=("  git -C \"\$srcdir/${gitmodule%/.gitmodules}\" submodule update --init${remote:+ --remote}")
done < <(ls -- **/.gitmodules )

{
	IFS=$'\n'
	echo -e "\n# Generated with git_submodule_PKGBUILD_conf.sh ( https://gist.github.com/bartoszek/41a3bfb707f1b258de061f75b109042b )"
	echo -e "# Call prepare_submodule in prepare() function\n"
	echo -e "prepare_submodule() {\n${prepare[*]}\n}"
	echo -e "source+=(\n${source[*]}\n)"
}