#!/bin/sh

# kinda brittle, this, but mostly works
# just don't use names with whitespaces

target='confconf'
srcdir='src'
sources=`find $srcdir -type f -name '*.c' | sed -e "s/$srcdir\/\(.*\).c/\1.c/"`
objdir='build'
objects=`find $srcdir -type f -name '*.c' | sed -e "s/$srcdir\/\(.*\).c/\1.o/"`

cc='cc'
cflags='-Wall -O2'
cflagsdebug='-Wall -ggdb3 -O0 -DDEBUG'
prefix='/usr/local'




dbg_objects=`printf %s "$objects" | sed -e "s/^/dbg_/"`
sources_wdir=`printf %s "$sources" | sed -e "s/^/$srcdir\//"`
objects_wdir=`printf %s "$objects" | sed -e "s/^/$objdir\//"`

dgen='gcc'
if [ ! `2>/dev/null which gcc` ]; then
	if [ ! `2>/dev/null which clang` ]; then
		echo 'err: could not find a suitable ' \
			'compiler for calculating dependencies'
		return 1
	fi
	dgen='clang'
fi

{
	printf %s\\n '.POSIX:'
	printf %s\\n '.SUFFIXES:'
	printf %s\\n ''
	printf %s\\n "CC = $cc"
	printf %s\\n "CFLAGS = $cflags"
	printf %s\\n "CFLAGSDEBUG = $cflagsdebug"
	printf %s\\n "PREFIX = $prefix"
	printf %s\\n ''
	printf %s\\n "all: objdir $target"
	printf %s\\n ''
	printf %s\\n "debug: objdir dbg_$target"
	printf %s\\n ''
	printf %s\\n 'objdir:'
	printf %s\\n "	mkdir -p $objdir"
	printf %s\\n ''
	printf %s\\n "install: all"
	printf %s\\n '	mkdir -p $(DESTDIR)$(PREFIX)/bin'
	printf %s\\n '	mkdir -p $(DESTDIR)$(PREFIX)/share/man/man1'
	printf %s\\n "	cp -f $target \$(DESTDIR)\$(PREFIX)/bin"
	printf %s\\n "	gzip < ${target}.1 > \$(DESTDIR)\$(PREFIX)/share/man/man1/${target}.1.gz"
	printf %s\\n ''
	printf %s\\n "$target: `printf %s "$objects" | tr '\n' ' '`"
	printf %s\\n "	\$(CC) \$(LDFLAGS) -o $target `printf %s "$objects_wdir" | tr '\n' ' '` \$(LDLIBS)"
	printf %s\\n ''
	printf %s\\n "dbg_$target: `printf %s "$dbg_objects" | tr '\n' ' '`"
	printf %s\\n "	\$(CC) \$(LDFLAGS) -o $target `printf %s "$objects_wdir" | tr '\n' ' '` \$(LDLIBS)"
	printf %s\\n ''
	printf %s\\n "$sources" | (while IFS= read -r s; do
		$dgen $CFLAGS -MM -MT `printf %s $s | sed -e 's/\.c$/\.o/'` "$srcdir/$s"
		printf %s\\n "	\$(CC) -c \$(CFLAGS) -o ${objdir}/`printf %s $s | sed -e 's/\.c$/\.o/'` ${srcdir}/$s"
	done
	)
	printf %s\\n ''
	printf %s\\n "$sources" | (while IFS= read -r s; do
		$dgen $CFLAGS -MM -MT dbg_`printf %s $s | sed -e 's/\.c$/\.o/'` "$srcdir/$s"
		printf %s\\n "	\$(CC) -c \$(CFLAGSDEBUG) -o ${objdir}/`printf %s $s | sed -e 's/\.c$/\.o/'` ${srcdir}/$s"
	done
	)
	printf %s\\n ''
	printf %s\\n 'clean:'
	printf %s\\n "	rm -f $target"
	printf %s\\n "	rm -rf $objdir"
} > Makefile