#! /usr/bin/env python

""" lserrs.py -- Build tool.  Summarize errors from an error log."""

import os
import re
import sys

#
#  Important constants.
#

_max_messages = 600
_max_loglines = 5000


def _scan_for_errors (filename, regexlist):
	"""Find the error summary lines in a file."""
	linecnt = 0
	errcnt = 0
	errlines = []
	errs_by_phase = {}
	phaselist = []
	phase = "unknown"
	f = open (filename, "r")

	for line in f.xreadlines ():
		if line[-1] == "\n": line = line[:-1]
		linecnt = linecnt + 1
		if linecnt > _max_loglines:
			print "ERROR: %d lines seen, skipping rest: %s" % (_max_loglines, filename,)
			break
		#errlines = errlines + [line]
		if line[0:8] == "#----- (":
			#print "line:", line
			try: (junk, phase, pkgname, pkgver) = line.split (None, 3)
			except Exception:
				try: (junk, phase, pkgname) = line.split (None, 2)
				except Exception:
					phase = "unknown"
					print "ERROR: malformed error log header!"
					print "ERROR: filename: %s" % (filename,)
					print "ERROR: %s" % (line,)
			if phase[0] == "(":
				phase = phase[1:]
				phase = phase[:-1]
			#print "phase: '%s'" % (phase,)
		elif line[0:7] == "#----- ":
			#print "line:", line
			phase = "unknown"
			try: (junk, pkgname, pkgver) = line.split (None, 2)
			except Exception:
				try: (junk, pkgname) = line.split (None, 1)
				except Exception:
					print "ERROR: malformed error log header!"
					print "ERROR: filename: %s" % (filename,)
					print "ERROR:", line
			#print "phase: '%s'" % (phase,)
		#if phase in ["all", "codegen", "d0omgen", "include", "lib", "bin", "test"]: continue
		#if phase == "test":
		#	print filename
		if line and (line[0] != "#"):
			matched = 0
			for regex in regexlist:
				if regex.search (line):
					matched = 1
					break
			if not matched:
				errcnt = errcnt + 1
				#if errs_by_phase.has_key (phase):
				#	errs_by_phase[phase] = errs_by_phase[phase] + [line]
				#else:
				#	errs_by_phase[phase] = [line]
				#	phaselist = phaselist + [phase]
				print line
	f.close ()
	return (errcnt, errlines, errs_by_phase, phaselist)

def _main ():

	#
	#  Check environment variables.
	#

	pub = os.environ.get ("SRT_PUBLIC_CONTEXT")
	if not pub:
		print "ERROR: SRT_PUBLIC_CONTEXT is not set!"
		sys.exit (127)

	pri = os.environ.get ("SRT_PRIVATE_CONTEXT")
	if not pri:
		print "ERROR: SRT_PRIVATE_CONTEXT is not set!"
		sys.exit (127)

	#
	#  Construct important directory names.
	#

	prireldbdir = os.path.join (pri, "D0reldb")
	pubreldbdir = os.path.join (pub, "D0reldb")

	#
	#  Locate important files.
	#

	regexfil = os.path.join (prireldbdir, "errs.regex")
	if not os.path.isfile (regexfil):
		regexfil = os.path.join (pubreldbdir, "errs.regex")
		if not os.path.isfile (regexfil):
			print "ERROR: Could not find errs.regex!"
			sys.exit (127)

	#
	#  Get regular expressions for error log filtering.
	#

	regexlist = []

	f = open (regexfil, "r")
	for line in f.xreadlines ():
		if line[-1] == "\n": line = line[:-1]
		regexlist = regexlist + [re.compile (line)]
	f.close ()

	#
	#  Loop over error log files and print error summaries.
	#

	for infile in sys.argv[1:]:
		errlines = []
		errs_by_phase = {}
		phaselist = []
		errcnt = 0

		if os.path.isfile (infile):

			print "#"
			print "#-----<%s>-----" % (infile,)
			print "#"

			(errcnt, errlines, errs_by_phase, phaselist) = _scan_for_errors (infile, regexlist)

		#if not errcnt: continue

		#if 0 == 1:
		#	print "phases:"
		#	for phase in phaselist:
		#		print phase
		#	for phase in phaselist:
		#		print "%s:" % (phase,)
		#		for line in errs_by_phase[phase]:
		#			print line
		#	print "errlines:"
		#	for line in errlines:
		#		print line

		#for phase in phaselist:
		#	for line in errs_by_phase[phase]:
		#		print line


if __name__ == "__main__":
	# We are being run as a script.
	_main ()
	sys.exit (0)
else:
	# We are being loaded as a module.
	pass