#!/bin/bash
mv Makefile Makefile.bak
CHR_UPGRADE='^'
CHR_UNINSTALL='/'

cat << EOF >> Makefile
# Autogenerated at $(date +'%d.%m.%Y %H:%M') using ${BASH_SOURCE[0]}
.DEFAULT_GOAL := help

#===============================================
#	Scripts listed in ./packs
#===============================================

EOF

for file in ./packs/*; do
    cat "$file" >> Makefile
    echo >> Makefile
done;

cat << EOF >> Makefile
#===============================================
#	Scripts listed in ./install
#===============================================

EOF

for file in ./install/*; do
    name=${file##*/}
    name=${name%.sh}
    desc=$(grep -m 1 -oP "(?<=^##makedesc:\s).*$" ${file})
    [ -z "$desc" ] && desc='<no description>'
    echo -e "# ${desc}\n${name}:\n\t@${file}\n" >> Makefile
done;

cat << EOF >> Makefile
#===============================================
#	Scripts listed in ./upgrade
#===============================================

EOF

for file in ./upgrade/*; do
    name=${file##*/}
    name=${name%.sh}
    desc=$(grep -m 1 -oP "(?<=^##makedesc:\s).*$" ${file})
    [ -z "$desc" ] && desc='<no description>'
    echo -e "# ${desc}\n${CHR_UPGRADE}${name}:\n\t@${file}\n" >> Makefile
done;

cat << EOF >> Makefile
#===============================================
#	Scripts listed in ./uninstall
#===============================================

EOF

for file in ./uninstall/*; do
    name=${file##*/}
    name=${name%.sh}
    desc=$(grep -m 1 -oP "(?<=^##makedesc:\s).*$" ${file})
    [ -z "$desc" ] && desc='<no description>'
    echo -e "# ${desc}\n${CHR_UNINSTALL}${name}:\n\t@${file}\n" >> Makefile
done;

cat << EOF >> Makefile
#===============================================
#	Service goals
#===============================================

self:
	@./gen-makefile

help: Makefile
	@echo "Ubuntu software installator"
	@echo
	@echo "Usage:\n \
	make help|- show this help\n \
	make self|- regenerate Makefile (alias of ./gen-makefile)\n \
	make GOAL|- install software\n \
	make ${CHR_UPGRADE}GOAL|- upgrade software\n \
	make ${CHR_UNINSTALL}GOAL|- uninstall software" | column -ts '|'
	@echo "\nYou can combine GOALs, here are some examples:"
	@echo "\tmake @docker docker"
	@echo "\tmake php @docker ^omz"
	@echo "\nAvailable GOALs:"
	@sed -n '/^#/{N;s/# *\(.*\)\n\([^# .].*:\)/\t\2\1/p}' $< | column -ts ':'
EOF

echo "New ./Makefile has been generated!"
echo "Old one has been saved as ./Makefile.bak"
echo "Now run 'make' to get help"