#!/bin/bash
mv Makefile Makefile.bak

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

self:
	@./gen-makefile

help: Makefile
	@echo "Ubuntu software installator"
	@echo
	@echo "Usage:"
	@echo "\tmake help\t - Show this help"
	@echo "\tmake self\t - Regenerate Makefile (alias of ./gen-makefile)"
	@echo "\tmake GOAL\t - Install software"
	@echo "\tmake ^GOAL\t - Upgrade software"
	@echo "\tmake @GOAL\t - Uninstall software"
	@echo
	@echo "You can combine GOALs, e.g. 'make @docker docker' will reinstall docker."
	@echo
	@echo "Available GOALs:"
	@sed -n '/^#/{N;s/# *\(.*\)\n\([^# .].*:\)/\t\2\1/p}' $< | column -ts ':'
+%:
	@$(MAKE) $*
^%:
	@./upgrade/$*
@%:
	@./uninstall/$*
EOF

echo "New ./Makefile has been generated!"
echo "Old one has been saved as ./Makefile.bak"
echo
make