#!/bin/bash

REP_CC=cc
REP_CXX=c++
REP_INCLUDE='-I$(HOME)/projects/include -I/usr/include'
REP_LIBRARIES=
REP_TARGET=target

SMAKE_DIR=~/dev/bash/smake/etc/smake
HELP_FILE=$SMAKE_DIR/help.smk
ENV_FILE=$SMAKE_DIR/env.smk
BUILD_FILE=$SMAKE_DIR/build.smk
RULES_FILE=$SMAKE_DIR/rules.smk

# Debug
DEBUG=1

# Parameters processing
TEMP=`getopt -o hc:x:i:l:t: --long help,cc:,cxx:,include:,libraries:,target: -- "$@"`
eval set -- "$TEMP"

while true ; do
	case "$1" in
		-h|--help) echo "Usage: smake.sh [key]... [goal]..." ;
			echo "Keys:"
			echo -e "-h, --help\t\t\tShow this help and exit."
			echo -e "-c [CC], --cc [CC]\t\tUse CC as C compiler."
			echo -e "-x [CXX], --cxx [CXX]\t\tUse CXX as C++ compiler." 
			echo -e "-i [INC], --include [INC]\tSet INC as include path."
			echo -e "-l [LIB], --libraries [LIB]\tSet LIB as libraries that must be linked with."
			echo -e "-t [TGT], --target [TGT]\tSet TGT as target name."
			echo
			echo -e "This program works on any Linux with GNU Baurne's shell"
			echo -e "Report bugs to <mecareful@gmail.com>"
			exit 0 ;
			;;
		-c|--cc) REP_CC=$2 ; echo "CC=$REP_CC" ; shift 2 ;;
		-x|--cxx) REP_CXX=$2 ; echo "CXX=$REP_CXX" ; shift 2 ;;
		-i|--include) REP_INCLUDE=$2 ; echo "INCLUDE=$REP_INCLUDE"; shift 2 ;;
		-l|--libraries) REP_LIBRARIES=$2 ; echo "LIBRARIES=$REP_LIBRARIES"; shift 2 ;;
		-t|--target) REP_TARGET=$2 ; echo "TARGET=$REP_TARGET"; shift 2 ;;
		--) shift ; break ;;
		*) echo "Internal error!" ; exit 1 ;;
	esac
done

# ======= Help =======
cat $HELP_FILE > Makefile
echo >> Makefile

# ======= Environment =======
sed "s~REP_CC~$REP_CC~ ; s~REP_CXX~$REP_CXX~ ; \
     s~REP_LIBRARIES~$REP_LIBRARIES~ ; s~REP_TARGET~$REP_TARGET~" $ENV_FILE >> Makefile

# INCLUDE0, INCLUDE1, INCLUDE2, ...
REP_INCLUDE=`echo $REP_INCLUDE | sed "s~-I~~g"`

i=1
for d in $REP_INCLUDE; do
	echo "INCLUDE$i=$d" >> Makefile
	i=$((i+1))
done

echo -n "INCLUDE=" >> Makefile

i=1
for d in $REP_INCLUDE; do
	if [ $i != 1 ]; then
		echo -n ' ' >> Makefile
	fi
	echo -n '-I$(INCLUDE'$i')' >> Makefile
	i=$((i+1))
done
echo >> Makefile

echo >> Makefile

# ======= Build =======
cat $BUILD_FILE >> Makefile

echo >> Makefile

# ======= Rules =======
cat $RULES_FILE >> Makefile

REP_INCLUDE=`echo $REP_INCLUDE | sed "s~-I~~g ; s~\\$(HOME)~${HOME}~"`

# --- Target deplist ---
target_dep_lst=`remove_c_comments.pl $REP_TARGET.c | grep -P '^[\t ]*#include[\t ]*"' | sed 's~[^"]*"\([^"]*\)".*~\1~' | sort -u`
files_not_found=

while [[ "$target_dep_lst" != "$old_target_dep_lst" ]]; do
	old_target_dep_lst=$target_dep_lst
	for f in $target_dep_lst; do
		F=""
		for d in . $REP_INCLUDE; do
			if [ -f "$d/$f" ]; then
				F="$d/$f"
				C=`echo $f | sed 's~\.h$~\.c~'`
				if [ -f "$d/$C" ]; then
					target_dep_lst="$target_dep_lst $C"	
				fi
				break
			fi
		done
		if [ "$F" == "" ]; then
			files_not_found="$files_not_found\n$f"
			continue
		fi
		target_dep_lst="$target_dep_lst "`remove_c_comments.pl $F \
		               | grep -P '^[\t ]*#include[\t ]*"' \
					   | sed 's~[^"]*"\([^"]*\)".*~\1~' | sort -u`
		target_dep_lst=`echo $target_dep_lst | sed 's~ ~\n~g' | sort -u`
	done
done

if [ $DEBUG == 1 ]; then
	echo -e "target_dep_lst:\n`echo $target_dep_lst | sed -e 's~ ~\n~g' | sed 's~\(^..\)~  \1~g'`"
fi

# --- Target's objects ---
target_obj_lst=`echo "$target_dep_lst" | grep -P '.c$' | sed -e 's~.c$~.o~'`
if [ $DEBUG == 1 ]; then
	echo -e "target_obj_lst:\n`echo $target_obj_lst | sed -e 's~ ~\n~g' | sed 's~\(^..\)~  \1~g'`"
fi

# --- Target's target ;) ---
echo "target_objs = \\" >> Makefile
for to in $target_obj_lst; do
	echo -e "\t$to \\" >> Makefile
done
echo >> Makefile

echo '$(TARGET): $(target_objs)' >> Makefile
echo -e '\t$(CC) $(LDFLAGS) -o $@ $(target_objs)' >> Makefile

echo >> Makefile

# --- Object files deplist ---
for cf in `echo "$target_dep_lst" | grep -P '.c$'`; do
	CF=""
	for d in . $REP_INCLUDE; do
		if [ -f "$d/$cf" ]; then
			CF="$d/$cf"
			break
		fi
	done
	if [ "$CF" == "" ]; then
		files_not_found="$files_not_found\n$cf"
		continue
	fi

	to=`basename "$cf" | sed 's~.c$~.o~'`

	target_dep_lst="$CF "`remove_c_comments.pl $CF | grep -P '^[\t ]*#include[\t ]*"' | sed 's~[^"]*"\([^"]*\)".*~\1~' | sort -u`
	old_target_dep_lst=
	files_not_found=
	while [[ "$target_dep_lst" != "$old_target_dep_lst" ]]; do
		old_target_dep_lst=$target_dep_lst
		for f in $target_dep_lst; do
			F=""
			for d in . $REP_INCLUDE; do
				if [ -f "$d/$f" ]; then
					F="$d/$f"
					break
				fi
			done
			if [ "$F" == "" ]; then
				files_not_found="$files_not_found\n$f"
				continue
			fi
			target_dep_lst="$target_dep_lst "`remove_c_comments.pl $F \
			               | grep -P '^[\t ]*#include[\t ]*"' \
					   	| sed 's~[^"]*"\([^"]*\)".*~\1~' | sort -u`
			target_dep_lst=`echo $target_dep_lst | sed 's~ ~\n~g' | sort -u`
		done
	done

	target_dep_lst=
	for f in $old_target_dep_lst; do
		F=""
		for d in . $REP_INCLUDE; do
			if [ -f "$d/$f" ]; then
				F="$d/$f"
				break
			fi
		done
		if [ "$F" == "" ]; then
			files_not_found="$files_not_found\n$f"
			continue
		fi
		target_dep_lst=`echo "$F $target_dep_lst" | sed 's~ ~\n~g' | sort -u`
	done

	echo "$to: \\" >> Makefile
	for td in $target_dep_lst; do
		td=`echo "$td" | sed "s~^\./~~ ; s~^\./~~ ; s~${HOME}~$\(HOME\)~"`
		echo -e "\t$td \\" >> Makefile
	done
	echo >> Makefile
done



# ======= Warning =======
files_not_found=`echo -e "$files_not_found" | sort -u`
if [ "$files_not_found" != "" ]; then
	echo WARNING: Include files not found: $files_not_found
fi