#!/usr/bin/env python
"""mklibdeps.py"""

import os
import re
import string
import sys

pkgdir = {}
depfiles = {}
libdeps = {}
targets = {}

arch = ""
pri = ""
pub = ""



def initialize ():
	global arch, pri, pub
	arch = os.environ["SRT_ARCH"]
	arch = arch[0:6]

	pri = os.environ["SRT_PRIVATE_CONTEXT"]
	pub = os.environ["SRT_PUBLIC_CONTEXT"]

	if arch == "CYGWIN":
		pipe = os.popen("cygpath -w " + pri)
		pri = pipe.readline()
		pri = pri[0:-1]
		err = pipe.close()

		pipe = os.popen("cygpath -w " + pub)
		pub = pipe.readline()
		pub = pub[0:-1]
		err = pipe.close()

def main():
	scan_for_libdeps()
	read_libdeps()
	write_file()

def scan_for_libdeps():
	global depfiles
	global pkgdir
	global arch
	global pri
	global pub
	global targets

	deplist = []
	pkglist = []
	filelist = []
	filename= ""
	pkg = ""

	filelist = []
	if os.path.exists(pub):
		filelist = os.listdir(pub)
	for filename in filelist:
		fullname = os.path.join(pub, filename)
		if arch == "CYGWIN":
			fullname = resolve_symlink(fullname)
		if os.path.isdir(fullname):
			if os.path.exists(os.path.join(fullname, "GNUmakefile")):
				pkgdir[filename] = fullname

	filelist = []
	if os.path.exists(pri):
		filelist = os.listdir(pri)
	for filename in filelist:
		fullname = os.path.join(pri, filename)
		if arch == "CYGWIN":
			fullname = resolve_symlink(fullname)
		if os.path.isdir(fullname):
			if os.path.exists(os.path.join(fullname, "GNUmakefile")):
				pkgdir[filename] = fullname

	pkglist = pkgdir.keys()
	pkglist.sort()
	for pkg in pkglist:
		targets[pkg] = 1
		deplist = []
		filelist = os.listdir(pkgdir[pkg])
		for filename in filelist:
			if filename == "LIBDEPS":
				deplist.append(filename)
			elif filename[0:8] == "LIBDEPS_":
				deplist.append(filename)
		depfiles[pkg] = deplist
		

def read_libdeps():
	global pkgdir
	global depfiles
	global libdeps
	global targets

	pkglist = []
	pkg = ""

	filename = ""
	file = ""
	line = ""
	pos = -1

	depdict = {}
	deplib = ""

	liblist = []
	library = ""


	pkglist = depfiles.keys()
	pkglist.sort()
	for pkg in pkglist:
		for filename in depfiles[pkg]:
			depdict = {}

			file = open(os.path.join(pkgdir[pkg], filename), "r")
			for line in file.readlines():
				pos = string.find(line, "#")
				if pos != -1:
					line = line[:pos]
				line = string.strip(line)
				for deplib in string.split(line):
					depdict[deplib] = 1
					targets[deplib] = 1
			file.close()

			liblist = depdict.keys()
			liblist.sort()

			library = ""
			if filename == "LIBDEPS":
				library = pkg
			elif filename[0:8] == "LIBDEPS_":
				library = filename[8:]

			libdeps[library] = liblist
			targets[library] = 1

def write_file():
	global targets
	global libdeps
	print ".PHONY: pkgs"
	print
	print ".PHONY:",
	targlist = targets.keys()
	targlist.sort()
	for targ in targlist:
		print targ,
	print
	print
	print "pkgs :",
	for targ in targlist:
		print targ,
	print
	print
	for targ in targlist:
		print targ,
	print ":"
	print '\t@echo "$@"'
	print
	liblist = libdeps.keys()
	liblist.sort()
	for library in liblist:
		print library + " :",
		for dep in libdeps[library]:
			print dep,
		print
	print
	print "%.mk :"
	print
	print "% :"
	print '\t@echo "WARNING: unknown library ($@)!" 1>&2'
	print

def resolve_symlink(fullname):
	oldname = ""
	count = 0
	while (count < 10) and (fullname != oldname):
		oldname = fullname
		fullname = follow_symlink(fullname)
		count = count + 1
	return fullname

def follow_symlink(fullname):
	global arch
	if os.path.isfile(fullname):
		file = open(fullname, "rb")
		tmp = file.read(10)
		if tmp == "!<symlink>":
			tmp = file.read()
			(head, tail) = os.path.split(fullname)
			pipe = os.popen("cygpath -w " + os.path.join(head, tmp[:-1]))
			fullname = pipe.readline()
			fullname = fullname[0:-1]
			err = pipe.close()
		err = file.close()
	return fullname

#			(tmphead, tmptail) = os.path.split(tmp[:-1])
#			pipe = os.popen("sh -c 'cd " + string.replace(head, "\\", "\\\\") + "; cd " + string.replace(tmphead, "\\", "\\\\") + "; pwd'")
#			tmp = pipe.readline()
#			err = pipe.close()
#			fullname = os.path.join(tmp[:-1], tmptail)
#			pipe = os.popen("cygpath -w " + fullname)
#			fullname = pipe.readline()
#			fullname = fullname[0:-1]
#			err = pipe.close()

if __name__ == "__main__":
	# We are being run as a script.
	initialize ()
	main ()
else:
	# We are being loaded as a module.
	initialize ()
	pass