util/check_dif_statuses.py - 3p/lowrisc/opentitan - Git at Google

 #!/usr/bin/env python3
 # -*- coding: utf-8 -*-
 # Copyright lowRISC contributors.
 # Licensed under the Apache License, Version 2.0, see LICENSE for details.
 # SPDX-License-Identifier: Apache-2.0
 """DIF Status Report Generator.

 This tool generates a status report for the DIFs by cross referencing the git
 commit history of each DIF with that of the HW it actuates to provide OpenTitan
 developers with information about what DIFs require updating.

 To display usage run:
     ./check_dif_statuses.py --help
 """

 import argparse
 import collections
 import glob
 import io
 import json
 import logging
 import os
 import re
 import sys
 from contextlib import redirect_stdout
 from enum import Enum
 from typing import List

 import enlighten
 import gitfame
 import hjson
 import pydriller
 from tabulate import tabulate
 from termcolor import colored

 # The IP suffix of some DIFs are slightly different than the IP directory name
 # in the hw/ip/ directory, so here is the translation for the applicable IPs.
 IP_TRANSLATION = {
     "plic": "rv_plic",
     "entropy": "entropy_src",
 }


 class _OTComponent(Enum):
     """Type of OpenTitan component."""
     DIF = 1
     HW = 2


 class DIFStatus:
     """Holds all DIF status information for displaying.

     Attributes:
         dif_name (str): Full name of the DIF including the IP name.
         ip (str): Name of the IP the DIF is associated with.
         dif_path (str): Path to the DIF code.
         hw_path (str): Path to the HW RTL associated with this DIF.
         dif_last_modified (datetime): Date and time the DIF was last modified.
         hw_last_modified (datetime): Date and time the HW was last modified.
         dif_main_contributors (List[str]): List of emails of DIF contributors.
         hw_main_constributors (List[str]): List of emails of HW contributors.
         lifecycle_state (str): Lifecycle state string (e.g., S0, S1, ...).
         num_functions_defined (int): Number of API functions defined.
         num_functions_implemented (int): Number of API functions implemented.
         api_complete (bool): Indicates if DIF implements all defined functions.
         funcs_unimplemented (Set[str]): Set of unimplemted DIF functions.

     """
     def __init__(self, repo_top, difs_root_path, dif_name):
         """Mines metadata to populate this DIFStatus object.

         Args:
             repo_top: Relative path of local OpenTitan repository.
             difs_root_path: Path to DIF source code from repo_top.
             dif_name: Full name of the DIF including the IP name.

         Raises:
             ValueError: Raised if DIF name does not start with "dif_".
         """
         # Get DIF/IP names and path.
         if not dif_name.startswith("dif_"):
             raise ValueError("DIF name should start with \"dif_\".")
         self.dif_name = dif_name
         self.ip = self.dif_name[4:]
         if self.ip in IP_TRANSLATION:
             self.ip = IP_TRANSLATION[self.ip]
         self.dif_path = os.path.join(difs_root_path, dif_name)
         self.hw_path = f"hw/ip/{self.ip}"
         # Determine last date DIF and HW was updated.
         self.dif_last_modified = self._get_last_commit_date(
             repo_top, self.dif_path, [".h", ".c"])
         self.hw_last_modified = self._get_last_commit_date(
             repo_top, os.path.join(self.hw_path, "rtl"), [""])
         # Determine the main contributor of the DIF and HW.
         self.dif_main_contributors = self._get_main_contributor_emails(
             _OTComponent.DIF)
         self.hw_main_contributors = self._get_main_contributor_emails(
             _OTComponent.HW)
         # Determine lifecycle state
         self.lifecycle_state = self._get_dif_lifecycle_state()
         # Determine DIF API completeness.
         self.num_functions_defined = -1
         self.num_functions_implemented = -1
         self.api_complete = False
         self.funcs_unimplemented = self._get_funcs_unimplemented()

     def _get_dif_lifecycle_state(self):
         hjson_filename = os.path.join(self.hw_path, "data",
                                       self.ip + ".prj.hjson")
         with open(hjson_filename, "r") as life_f:
             lifecycle_data = hjson.load(life_f)
         # If there are multiple revisions, grab the latest.
         if "revisions" in lifecycle_data:
             lifecycle_data = lifecycle_data["revisions"][-1]
         if "dif_stage" in lifecycle_data:
             return lifecycle_data["dif_stage"]
         return "-"

     def _get_main_contributor_emails(self, component):
         # Get contributor stats for HW or DIF (SW) and sort by LOC.
         if component == _OTComponent.DIF:
             stats = self._get_contributors(self.dif_path, [".h", ".c"])
         else:
             stats = self._get_contributors(os.path.join(self.hw_path, "rtl"),
                                            ["/*"])
         sorted_stats = sorted(stats.items(), key=lambda x: x[1], reverse=True)
         # If the second contributor has contributed at least 10% as much as the
         # first contributor, include both second and first contributors.
         contributor_1_email, contributor_1_loc = sorted_stats[0]
         if len(sorted_stats) > 1:
             contributor_2_email, contributor_2_loc = sorted_stats[1]
             if (float(contributor_2_loc) / float(contributor_1_loc)) > 0.1:
                 return [contributor_1_email, contributor_2_email]
         return [contributor_1_email]

     def _get_contributors(self, file_path, exts):
         contributor_stats = collections.defaultdict(int)
         for ext in exts:
             # Check the file/path exists.
             full_file_path = file_path + ext
             if os.path.isfile(full_file_path) or (
                     full_file_path.endswith("*") and
                     os.path.isdir(full_file_path[:-2])):
                 # Use gitfame to fetch commit stats, captured from STDOUT.
                 output = io.StringIO()
                 with redirect_stdout(output):
                     gitfame.main(args=[
                         f"--incl={full_file_path}", "-s", "-e", "--log=ERROR",
                         "--format=json"
                     ])
                 gitfame_commit_stats = json.loads(output.getvalue())
                 for contributor_stat in gitfame_commit_stats["data"]:
                     contributor = contributor_stat[0]
                     loc = contributor_stat[1]
                     if loc == 0:
                         break
                     contributor_stats[contributor] += loc
             else:
                 logging.error(
                     f"""(contributors) file path ({full_file_path}) """
                     """does not exist.""")
                 sys.exit(1)
         return contributor_stats

     def _get_last_commit_date(self, repo_top, file_path, exts):
         last_dif_commit_date = None
         for ext in exts:
             # Check the file exists.
             full_file_path = file_path + ext
             if os.path.isfile(full_file_path) or os.path.isdir(full_file_path):
                 repo = pydriller.Repository(
                     repo_top, filepath=full_file_path).traverse_commits()
                 for commit in repo:
                     if last_dif_commit_date is None:
                         last_dif_commit_date = commit.author_date
                     else:
                         last_dif_commit_date = max(last_dif_commit_date,
                                                    commit.author_date)
             else:
                 logging.error(
                     f"(date) file path ({full_file_path}) does not exist.")
                 sys.exit(1)
         return last_dif_commit_date

     def _get_funcs_unimplemented(self):
         defined_funcs = self._get_defined_funcs()
         implemented_funcs = self._get_implemented_funcs()
         self.num_functions_defined = len(defined_funcs)
         self.num_functions_implemented = len(implemented_funcs)
         self.api_complete = bool(defined_funcs and
                                  defined_funcs == implemented_funcs)
         return defined_funcs - implemented_funcs

     def _get_defined_funcs(self):
         header_file = self.dif_path + ".h"
         return self._get_funcs(header_file)

     def _get_implemented_funcs(self):
         c_file = self.dif_path + ".c"
         # If no .c file exists --> All functions are undefined.
         if not os.path.isfile(c_file):
             return set()
         return self._get_funcs(c_file)

     def _get_funcs(self, file_path):
         func_pattern = re.compile(r"^dif_.*_result_t (dif_.*)\(.*")
         funcs = set()
         with open(file_path, "r") as fp:
             for line in fp:
                 result = func_pattern.search(line)
                 if result is not None:
                     funcs.add(result.group(1))
         return funcs


 def get_list_of_difs(difs_root_path: str, shared_headers: List[str]) -> None:
     """Get a list of the root filenames of the DIFs.

     Args:
         difs_root_path: Root path where DIF source files are located.
         shared_headers: Header file(s) shared amongst DIFs.

     Returns:
         None
     """
     dif_headers = list(glob.glob(os.path.join(difs_root_path, "*.h")))
     dif_headers = map(os.path.basename, dif_headers)
     difs = set(map(lambda s: s.split(".")[0], dif_headers))
     for header in shared_headers:
         if header in difs:
             difs.remove(header)
     return difs


 def print_status_table(dif_statuses: List[DIFStatus],
                        table_format: str) -> None:
     """Print a table of DIF status information to STDOUT.

     Args:
         dif_statuses: List of DIFStatus objects containing metadata about DIF
             development states.

     Returns:
         None
     """
     # Build the table.
     rows = []
     headers = [
         "IP", "DIF Updated", "HW Updated", "DIF Contributor*",
         "HW Contributor*", "Functions\nDefined", "Functions\nImplemented",
         "Stage"
     ]
     for dif_status in dif_statuses:
         # Color code last modified dates.
         if dif_status.hw_last_modified > dif_status.dif_last_modified:
             hw_last_modified = colored(dif_status.hw_last_modified.date(),
                                        "yellow")
             dif_last_modified = colored(dif_status.dif_last_modified.date(),
                                         "yellow")
         else:
             hw_last_modified = dif_status.hw_last_modified.date()
             dif_last_modified = dif_status.dif_last_modified.date()
         # Color code API complete status.
         if dif_status.api_complete:
             num_funcs_defined = colored(dif_status.num_functions_defined,
                                         "green")
             num_funcs_implemented = colored(
                 dif_status.num_functions_implemented, "green")
         else:
             num_funcs_defined = colored(dif_status.num_functions_defined,
                                         "red")
             num_funcs_implemented = colored(
                 dif_status.num_functions_implemented, "red")

         # Add row to table (printing one contributor email per line).
         rows.append([
             dif_status.ip, dif_last_modified, hw_last_modified,
             "\n".join(dif_status.dif_main_contributors),
             "\n".join(dif_status.hw_main_contributors), num_funcs_defined,
             num_funcs_implemented, dif_status.lifecycle_state
         ])

     # Print the table and legend.
     print("DIF Statuses:")
     print(tabulate(rows, headers, tablefmt=table_format))
     print("""*Only the top two contributors (by LOC) """
           """for each component are listed.""")
     print(colored("Yellow", "yellow"),
           "\t= HW has been updated since the DIF.")
     print(
         colored("Green", "green"),
         """\t= DIF API, as defined in the current header file, is complete. """
         """Note, the header file may lack necessary API functionality.""")
     print(colored("Red", "red"),
           "\t= DIF API is incomplete, as defined in the header file.")


 def print_unimplemented_functions(dif_statuses: List[DIFStatus],
                                   table_format: str) -> None:
     """Print a table of unimplemented DIF functions to STDOUT.

     Args:
         dif_statuses: List of DIFStatus objects containing metadata about DIF
             development states.

     Returns:
         None
     """
     rows = []
     headers = ["IP", "Function"]
     for dif_status in dif_statuses:
         if not dif_status.api_complete:
             rows.append(
                 [dif_status.ip, "\n".join(dif_status.funcs_unimplemented)])
     print("Unimplemented Functions:")
     print(tabulate(rows, headers, tablefmt=table_format))


 def main(argv):
     # Process args.
     parser = argparse.ArgumentParser(
         prog="check_dif_statuses",
         formatter_class=argparse.RawDescriptionHelpFormatter)
     parser.add_argument(
         "repo_top",
         help=
         """Relative path to where the OpenTitan repository is checked out.""")
     parser.add_argument(
         "--show-unimplemented",
         action="store_true",
         help="""Show unimplemented functions for each incomplete DIF.""")
     parser.add_argument("--table-format",
                         type=str,
                         choices=["grid", "github", "pipe"],
                         default="grid",
                         help="""Format to print status tables in.""")
     args = parser.parse_args(argv)

     # Define root path of DIFs.
     difs_root_path = os.path.join("sw", "device", "lib", "dif")

     # Get list of all DIF basenames.
     # TODO: automatically get the list below by cross referencing DIF names
     # with IP block names. Hardcoded for now.
     shared_headers = ["dif_warn_unused_result"]
     difs = get_list_of_difs(difs_root_path, shared_headers)

     # Get DIF statuses (while displaying a progress bar).
     dif_statuses = []
     progress_bar = enlighten.Counter(total=len(difs),
                                      desc="Analyzing statuses of DIFs ...",
                                      unit="DIFs")
     for dif in difs:
         dif_statuses.append(DIFStatus(args.repo_top, difs_root_path, dif))
         progress_bar.update()

     # Build table and print it to STDOUT.
     print_status_table(dif_statuses, args.table_format)
     if args.show_unimplemented:
         print_unimplemented_functions(dif_statuses, args.table_format)


 if __name__ == "__main__":
     main(sys.argv[1:])
	#!/usr/bin/env python3
	# -- coding: utf-8 --
	# Copyright lowRISC contributors.
	# Licensed under the Apache License, Version 2.0, see LICENSE for details.
	# SPDX-License-Identifier: Apache-2.0
	"""DIF Status Report Generator.

	This tool generates a status report for the DIFs by cross referencing the git
	commit history of each DIF with that of the HW it actuates to provide OpenTitan
	developers with information about what DIFs require updating.

	To display usage run:
	./check_dif_statuses.py --help
	"""

	import argparse
	import collections
	import glob
	import io
	import json
	import logging
	import os
	import re
	import sys
	from contextlib import redirect_stdout
	from enum import Enum
	from typing import List

	import enlighten
	import gitfame
	import hjson
	import pydriller
	from tabulate import tabulate
	from termcolor import colored

	# The IP suffix of some DIFs are slightly different than the IP directory name
	# in the hw/ip/ directory, so here is the translation for the applicable IPs.
	IP_TRANSLATION = {
	"plic": "rv_plic",
	"entropy": "entropy_src",
	}


	class _OTComponent(Enum):
	"""Type of OpenTitan component."""
	DIF = 1
	HW = 2


	class DIFStatus:
	"""Holds all DIF status information for displaying.

	Attributes:
	dif_name (str): Full name of the DIF including the IP name.
	ip (str): Name of the IP the DIF is associated with.
	dif_path (str): Path to the DIF code.
	hw_path (str): Path to the HW RTL associated with this DIF.
	dif_last_modified (datetime): Date and time the DIF was last modified.
	hw_last_modified (datetime): Date and time the HW was last modified.
	dif_main_contributors (List[str]): List of emails of DIF contributors.
	hw_main_constributors (List[str]): List of emails of HW contributors.
	lifecycle_state (str): Lifecycle state string (e.g., S0, S1, ...).
	num_functions_defined (int): Number of API functions defined.
	num_functions_implemented (int): Number of API functions implemented.
	api_complete (bool): Indicates if DIF implements all defined functions.
	funcs_unimplemented (Set[str]): Set of unimplemted DIF functions.

	"""
	def __init__(self, repo_top, difs_root_path, dif_name):
	"""Mines metadata to populate this DIFStatus object.

	Args:
	repo_top: Relative path of local OpenTitan repository.
	difs_root_path: Path to DIF source code from repo_top.
	dif_name: Full name of the DIF including the IP name.

	Raises:
	ValueError: Raised if DIF name does not start with "dif_".
	"""
	# Get DIF/IP names and path.
	if not dif_name.startswith("dif_"):
	raise ValueError("DIF name should start with \"dif_\".")
	self.dif_name = dif_name
	self.ip = self.dif_name[4:]
	if self.ip in IP_TRANSLATION:
	self.ip = IP_TRANSLATION[self.ip]
	self.dif_path = os.path.join(difs_root_path, dif_name)
	self.hw_path = f"hw/ip/{self.ip}"
	# Determine last date DIF and HW was updated.
	self.dif_last_modified = self._get_last_commit_date(
	repo_top, self.dif_path, [".h", ".c"])
	self.hw_last_modified = self._get_last_commit_date(
	repo_top, os.path.join(self.hw_path, "rtl"), [""])
	# Determine the main contributor of the DIF and HW.
	self.dif_main_contributors = self._get_main_contributor_emails(
	_OTComponent.DIF)
	self.hw_main_contributors = self._get_main_contributor_emails(
	_OTComponent.HW)
	# Determine lifecycle state
	self.lifecycle_state = self._get_dif_lifecycle_state()
	# Determine DIF API completeness.
	self.num_functions_defined = -1
	self.num_functions_implemented = -1
	self.api_complete = False
	self.funcs_unimplemented = self._get_funcs_unimplemented()

	def _get_dif_lifecycle_state(self):
	hjson_filename = os.path.join(self.hw_path, "data",
	self.ip + ".prj.hjson")
	with open(hjson_filename, "r") as life_f:
	lifecycle_data = hjson.load(life_f)
	# If there are multiple revisions, grab the latest.
	if "revisions" in lifecycle_data:
	lifecycle_data = lifecycle_data["revisions"][-1]
	if "dif_stage" in lifecycle_data:
	return lifecycle_data["dif_stage"]
	return "-"

	def _get_main_contributor_emails(self, component):
	# Get contributor stats for HW or DIF (SW) and sort by LOC.
	if component == _OTComponent.DIF:
	stats = self._get_contributors(self.dif_path, [".h", ".c"])
	else:
	stats = self._get_contributors(os.path.join(self.hw_path, "rtl"),
	["/*"])
	sorted_stats = sorted(stats.items(), key=lambda x: x[1], reverse=True)
	# If the second contributor has contributed at least 10% as much as the
	# first contributor, include both second and first contributors.
	contributor_1_email, contributor_1_loc = sorted_stats[0]
	if len(sorted_stats) > 1:
	contributor_2_email, contributor_2_loc = sorted_stats[1]
	if (float(contributor_2_loc) / float(contributor_1_loc)) > 0.1:
	return [contributor_1_email, contributor_2_email]
	return [contributor_1_email]

	def _get_contributors(self, file_path, exts):
	contributor_stats = collections.defaultdict(int)
	for ext in exts:
	# Check the file/path exists.
	full_file_path = file_path + ext
	if os.path.isfile(full_file_path) or (
	full_file_path.endswith("*") and
	os.path.isdir(full_file_path[:-2])):
	# Use gitfame to fetch commit stats, captured from STDOUT.
	output = io.StringIO()
	with redirect_stdout(output):
	gitfame.main(args=[
	f"--incl={full_file_path}", "-s", "-e", "--log=ERROR",
	"--format=json"
	])
	gitfame_commit_stats = json.loads(output.getvalue())
	for contributor_stat in gitfame_commit_stats["data"]:
	contributor = contributor_stat[0]
	loc = contributor_stat[1]
	if loc == 0:
	break
	contributor_stats[contributor] += loc
	else:
	logging.error(
	f"""(contributors) file path ({full_file_path}) """
	"""does not exist.""")
	sys.exit(1)
	return contributor_stats

	def _get_last_commit_date(self, repo_top, file_path, exts):
	last_dif_commit_date = None
	for ext in exts:
	# Check the file exists.
	full_file_path = file_path + ext
	if os.path.isfile(full_file_path) or os.path.isdir(full_file_path):
	repo = pydriller.Repository(
	repo_top, filepath=full_file_path).traverse_commits()
	for commit in repo:
	if last_dif_commit_date is None:
	last_dif_commit_date = commit.author_date
	else:
	last_dif_commit_date = max(last_dif_commit_date,
	commit.author_date)
	else:
	logging.error(
	f"(date) file path ({full_file_path}) does not exist.")
	sys.exit(1)
	return last_dif_commit_date

	def _get_funcs_unimplemented(self):
	defined_funcs = self._get_defined_funcs()
	implemented_funcs = self._get_implemented_funcs()
	self.num_functions_defined = len(defined_funcs)
	self.num_functions_implemented = len(implemented_funcs)
	self.api_complete = bool(defined_funcs and
	defined_funcs == implemented_funcs)
	return defined_funcs - implemented_funcs

	def _get_defined_funcs(self):
	header_file = self.dif_path + ".h"
	return self._get_funcs(header_file)

	def _get_implemented_funcs(self):
	c_file = self.dif_path + ".c"
	# If no .c file exists --> All functions are undefined.
	if not os.path.isfile(c_file):
	return set()
	return self._get_funcs(c_file)

	def _get_funcs(self, file_path):
	func_pattern = re.compile(r"^dif_._result_t (dif_.)\(.*")
	funcs = set()
	with open(file_path, "r") as fp:
	for line in fp:
	result = func_pattern.search(line)
	if result is not None:
	funcs.add(result.group(1))
	return funcs


	def get_list_of_difs(difs_root_path: str, shared_headers: List[str]) -> None:
	"""Get a list of the root filenames of the DIFs.

	Args:
	difs_root_path: Root path where DIF source files are located.
	shared_headers: Header file(s) shared amongst DIFs.

	Returns:
	None
	"""
	dif_headers = list(glob.glob(os.path.join(difs_root_path, "*.h")))
	dif_headers = map(os.path.basename, dif_headers)
	difs = set(map(lambda s: s.split(".")[0], dif_headers))
	for header in shared_headers:
	if header in difs:
	difs.remove(header)
	return difs


	def print_status_table(dif_statuses: List[DIFStatus],
	table_format: str) -> None:
	"""Print a table of DIF status information to STDOUT.

	Args:
	dif_statuses: List of DIFStatus objects containing metadata about DIF
	development states.

	Returns:
	None
	"""
	# Build the table.
	rows = []
	headers = [
	"IP", "DIF Updated", "HW Updated", "DIF Contributor*",
	"HW Contributor*", "Functions\nDefined", "Functions\nImplemented",
	"Stage"
	]
	for dif_status in dif_statuses:
	# Color code last modified dates.
	if dif_status.hw_last_modified > dif_status.dif_last_modified:
	hw_last_modified = colored(dif_status.hw_last_modified.date(),
	"yellow")
	dif_last_modified = colored(dif_status.dif_last_modified.date(),
	"yellow")
	else:
	hw_last_modified = dif_status.hw_last_modified.date()
	dif_last_modified = dif_status.dif_last_modified.date()
	# Color code API complete status.
	if dif_status.api_complete:
	num_funcs_defined = colored(dif_status.num_functions_defined,
	"green")
	num_funcs_implemented = colored(
	dif_status.num_functions_implemented, "green")
	else:
	num_funcs_defined = colored(dif_status.num_functions_defined,
	"red")
	num_funcs_implemented = colored(
	dif_status.num_functions_implemented, "red")

	# Add row to table (printing one contributor email per line).
	rows.append([
	dif_status.ip, dif_last_modified, hw_last_modified,
	"\n".join(dif_status.dif_main_contributors),
	"\n".join(dif_status.hw_main_contributors), num_funcs_defined,
	num_funcs_implemented, dif_status.lifecycle_state
	])

	# Print the table and legend.
	print("DIF Statuses:")
	print(tabulate(rows, headers, tablefmt=table_format))
	print("""*Only the top two contributors (by LOC) """
	"""for each component are listed.""")
	print(colored("Yellow", "yellow"),
	"\t= HW has been updated since the DIF.")
	print(
	colored("Green", "green"),
	"""\t= DIF API, as defined in the current header file, is complete. """
	"""Note, the header file may lack necessary API functionality.""")
	print(colored("Red", "red"),
	"\t= DIF API is incomplete, as defined in the header file.")


	def print_unimplemented_functions(dif_statuses: List[DIFStatus],
	table_format: str) -> None:
	"""Print a table of unimplemented DIF functions to STDOUT.

	Args:
	dif_statuses: List of DIFStatus objects containing metadata about DIF
	development states.

	Returns:
	None
	"""
	rows = []
	headers = ["IP", "Function"]
	for dif_status in dif_statuses:
	if not dif_status.api_complete:
	rows.append(
	[dif_status.ip, "\n".join(dif_status.funcs_unimplemented)])
	print("Unimplemented Functions:")
	print(tabulate(rows, headers, tablefmt=table_format))


	def main(argv):
	# Process args.
	parser = argparse.ArgumentParser(
	prog="check_dif_statuses",
	formatter_class=argparse.RawDescriptionHelpFormatter)
	parser.add_argument(
	"repo_top",
	help=
	"""Relative path to where the OpenTitan repository is checked out.""")
	parser.add_argument(
	"--show-unimplemented",
	action="store_true",
	help="""Show unimplemented functions for each incomplete DIF.""")
	parser.add_argument("--table-format",
	type=str,
	choices=["grid", "github", "pipe"],
	default="grid",
	help="""Format to print status tables in.""")
	args = parser.parse_args(argv)

	# Define root path of DIFs.
	difs_root_path = os.path.join("sw", "device", "lib", "dif")

	# Get list of all DIF basenames.
	# TODO: automatically get the list below by cross referencing DIF names
	# with IP block names. Hardcoded for now.
	shared_headers = ["dif_warn_unused_result"]
	difs = get_list_of_difs(difs_root_path, shared_headers)

	# Get DIF statuses (while displaying a progress bar).
	dif_statuses = []
	progress_bar = enlighten.Counter(total=len(difs),
	desc="Analyzing statuses of DIFs ...",
	unit="DIFs")
	for dif in difs:
	dif_statuses.append(DIFStatus(args.repo_top, difs_root_path, dif))
	progress_bar.update()

	# Build table and print it to STDOUT.
	print_status_table(dif_statuses, args.table_format)
	if args.show_unimplemented:
	print_unimplemented_functions(dif_statuses, args.table_format)


	if __name__ == "__main__":
	main(sys.argv[1:])