make

#!/bin/bash

#	Name: make.sh
#	Author: Johan Hidding
#	Licence: do whatever you like with this, there's no waranty.
# -----------------
#	Description: this simple script should be able to compile and
#	link a simple but well structured c/c++ project.
# -----------------
#	Details: compiles every .cc file found in all subdirectories.
#	the script checks the modification times of the source files
#	and their header dependencies against the target files.
#	finally all .o files are linked to $target.
#	if you want to exclude files from compiling, put them in a
#	hidden directory (or somewhere outside the directory
#	structure, which is even better)

target="ae"
objdir="obj"
LDFLAGS="-lm -lrt -lfftw3 -lmpfr -lgmp -lboost_thread"
# -lgsl -lgslcblas
CFLAGS="-std=c++17 -O3 -frounding-math"

CC="g++"
ext=".cc"
ECHO="echo -e"

#/>==--------                                  --------==>\#
#>=----- you shouldn't need to edit below this line -----=<#
#\>==--------                                  --------==>/#

DIRS=$(find src -maxdepth 1 -type d -name '[^\.]*')
CCFILES=$(find src -maxdepth 2 -wholename "[^.]*$ext")

case "$TERM" in
dumb)
	prettyprint() {
		$ECHO " * $3 "
		if $1; then
			# $ECHO "\t[done]"
			return 1
		else
			$ECHO "\t[failed]"
			return 0
		fi
	}
	;;
*)
	prettyprint() {
		$ECHO "\033[$2m*\033[m $3"
		if $1; then
			$ECHO "\r\033[A\033[63C[\033[32mdone\033[m]"
			return 1
		else
			$ECHO "\033[62G[\033[31mfailed\033[m]"
			return 0
		fi
	}
	;;
esac

checknewer() {
	local k
	if [ ! -e $1 ]; then
		return 0
	fi

	for k in $2; do
		if [ $k -nt $1 ]; then
			return 0
		fi
	done
	return 1
}

compile() {
	dirn=$objdir/$(dirname $1)
	if [ ! -e $dirn ]; then
		mkdir -p $dirn
	fi

	objf=$dirn/$(basename $1 $ext).o
	deps=$($CC -MM $1 $CFLAGS | sed -e '{ s/^.*: //; s/\\//; s/^ *// }')
	if checknewer $objf "$deps"; then
		if prettyprint "$CC -c $CFLAGS $1 -o $objf" 34 "Compiling $1 ... "; then
			exit 1
		fi
	fi
}

case "$1" in
single)
	compile $2
	;;

all)
	for f in $CCFILES; do
		compile $f
	done

	objfiles=$(find $objdir -name '*.o')
	if checknewer $target "$objfiles"; then
		if prettyprint "$CC $objfiles -o $target $LDFLAGS" 36 "Linking ..."; then
			exit 1
		fi
	else
		echo "$target allready is up to date."
	fi
	;;

clean)
	rm -rf $target $objdir ${target}.test ${objdir}.test
	find . -name '*~' -exec rm {} \;
	;;

*)
	echo "This is a make script, written in bash. It is only good"
	echo "for compiling well-structured C++ programs. Read the"
	echo "source for help on configuring the script."
	echo
	echo "run> ./make [command]"
	echo "where [command] ∈ {single, all, clean}."
	echo
	echo "'make single' expects one more argument giving a .cc file"
	echo "that you want to compile."
	;;
esac