mirror of git://gcc.gnu.org/git/gcc.git
471 lines
12 KiB
Python
Executable File
471 lines
12 KiB
Python
Executable File
#!/usr/bin/python
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# Copyright (C) 2017 Free Software Foundation, Inc.
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#
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# This file is part of GCC.
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#
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# GCC is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3, or (at your option)
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# any later version.
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#
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# GCC is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with GCC; see the file COPYING. If not, write to
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# the Free Software Foundation, 51 Franklin Street, Fifth Floor,
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# Boston, MA 02110-1301, USA.
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# This script parses a .diff file generated with 'diff -up' or 'diff -cp'
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# and adds a skeleton ChangeLog file to the file. It does not try to be
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# too smart when parsing function names, but it produces a reasonable
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# approximation.
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#
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# This is a straightforward adaptation of original Perl script.
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#
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# Author: Yury Gribov <tetra2005@gmail.com>
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import sys
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import re
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import os.path
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import os
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import getopt
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import tempfile
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import time
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import shutil
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from subprocess import Popen, PIPE
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me = os.path.basename(sys.argv[0])
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def error(msg):
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sys.stderr.write("%s: error: %s\n" % (me, msg))
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sys.exit(1)
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def warn(msg):
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sys.stderr.write("%s: warning: %s\n" % (me, msg))
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class RegexCache(object):
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"""Simple trick to Perl-like combined match-and-bind."""
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def __init__(self):
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self.last_match = None
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def match(self, p, s):
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self.last_match = re.match(p, s) if isinstance(p, str) else p.match(s)
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return self.last_match
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def search(self, p, s):
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self.last_match = re.search(p, s) if isinstance(p, str) else p.search(s)
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return self.last_match
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def group(self, n):
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return self.last_match.group(n)
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cache = RegexCache()
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def print_help_and_exit():
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print """\
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Usage: %s [-i | --inline] [PATCH]
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Generate ChangeLog template for PATCH.
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PATCH must be generated using diff(1)'s -up or -cp options
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(or their equivalent in Subversion/git).
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When PATCH is - or missing, read standard input.
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When -i is used, prepends ChangeLog to PATCH.
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If PATCH is not stdin, modifies PATCH in-place, otherwise writes
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to stdout.
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""" % me
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sys.exit(1)
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def run(cmd, die_on_error):
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"""Simple wrapper for Popen."""
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proc = Popen(cmd.split(' '), stderr = PIPE, stdout = PIPE)
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(out, err) = proc.communicate()
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if die_on_error and proc.returncode != 0:
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error("`%s` failed:\n" % (cmd, proc.stderr))
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return proc.returncode, out, err
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def read_user_info():
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dot_mklog_format_msg = """\
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The .mklog format is:
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NAME = ...
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EMAIL = ...
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"""
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# First try to read .mklog config
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mklog_conf = os.path.expanduser('~/.mklog')
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if os.path.exists(mklog_conf):
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attrs = {}
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f = open(mklog_conf, 'rb')
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for s in f:
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if cache.match(r'^\s*([a-zA-Z0-9_]+)\s*=\s*(.*?)\s*$', s):
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attrs[cache.group(1)] = cache.group(2)
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f.close()
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if 'NAME' not in attrs:
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error("'NAME' not present in .mklog")
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if 'EMAIL' not in attrs:
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error("'EMAIL' not present in .mklog")
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return attrs['NAME'], attrs['EMAIL']
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# Otherwise go with git
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rc1, name, _ = run('git config user.name', False)
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name = name.rstrip()
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rc2, email, _ = run('git config user.email', False)
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email = email.rstrip()
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if rc1 != 0 or rc2 != 0:
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error("""\
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Could not read git user.name and user.email settings.
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Please add missing git settings, or create a %s.
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""" % mklog_conf)
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return name, email
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def get_parent_changelog (s):
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"""See which ChangeLog this file change should go to."""
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if s.find('\\') == -1 and s.find('/') == -1:
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return "ChangeLog", s
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gcc_root = os.path.dirname(os.path.dirname(os.path.realpath(__file__)))
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d = s
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while d:
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clname = d + "/ChangeLog"
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if os.path.exists(gcc_root + '/' + clname) or os.path.exists(clname):
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relname = s[len(d)+1:]
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return clname, relname
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d, _ = os.path.split(d)
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return "Unknown ChangeLog", s
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class FileDiff:
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"""Class to represent changes in a single file."""
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def __init__(self, filename):
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self.filename = filename
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self.hunks = []
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self.clname, self.relname = get_parent_changelog(filename);
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def dump(self):
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print "Diff for %s:\n ChangeLog = %s\n rel name = %s\n" % (self.filename, self.clname, self.relname)
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for i, h in enumerate(self.hunks):
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print "Next hunk %d:" % i
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h.dump()
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class Hunk:
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"""Class to represent a single hunk of changes."""
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def __init__(self, hdr):
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self.hdr = hdr
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self.lines = []
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self.ctx_diff = is_ctx_hunk_start(hdr)
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def dump(self):
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print '%s' % self.hdr
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print '%s' % '\n'.join(self.lines)
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def is_file_addition(self):
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"""Does hunk describe addition of file?"""
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if self.ctx_diff:
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for line in self.lines:
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if re.match(r'^\*\*\* 0 \*\*\*\*', line):
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return True
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else:
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return re.match(r'^@@ -0,0 \+1.* @@', self.hdr)
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def is_file_removal(self):
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"""Does hunk describe removal of file?"""
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if self.ctx_diff:
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for line in self.lines:
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if re.match(r'^--- 0 ----', line):
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return True
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else:
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return re.match(r'^@@ -1.* \+0,0 @@', self.hdr)
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def is_file_diff_start(s):
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# Don't be fooled by context diff line markers:
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# *** 385,391 ****
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return ((s.startswith('***') and not s.endswith('***'))
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or (s.startswith('---') and not s.endswith('---')))
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def is_ctx_hunk_start(s):
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return re.match(r'^\*\*\*\*\*\**', s)
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def is_uni_hunk_start(s):
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return re.match(r'^@@ .* @@', s)
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def is_hunk_start(s):
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return is_ctx_hunk_start(s) or is_uni_hunk_start(s)
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def remove_suffixes(s):
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if s.startswith('a/') or s.startswith('b/'):
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s = s[2:]
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if s.endswith('.jj'):
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s = s[:-3]
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return s
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def find_changed_funs(hunk):
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"""Find all functions touched by hunk. We don't try too hard
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to find good matches. This should return a superset
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of the actual set of functions in the .diff file.
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"""
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fns = []
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fn = None
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if (cache.match(r'^\*\*\*\*\*\** ([a-zA-Z0-9_].*)', hunk.hdr)
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or cache.match(r'^@@ .* @@ ([a-zA-Z0-9_].*)', hunk.hdr)):
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fn = cache.group(1)
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for i, line in enumerate(hunk.lines):
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# Context diffs have extra whitespace after first char;
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# remove it to make matching easier.
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if hunk.ctx_diff:
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line = re.sub(r'^([-+! ]) ', r'\1', line)
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# Remember most recent identifier in hunk
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# that might be a function name.
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if cache.match(r'^[-+! ]([a-zA-Z0-9_#].*)', line):
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fn = cache.group(1)
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change = line and re.match(r'^[-+!][^-]', line)
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# Top-level comment can not belong to function
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if re.match(r'^[-+! ]\/\*', line):
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fn = None
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if change and fn:
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if cache.match(r'^((class|struct|union|enum)\s+[a-zA-Z0-9_]+)', fn):
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# Struct declaration
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fn = cache.group(1)
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elif cache.search(r'#\s*define\s+([a-zA-Z0-9_]+)', fn):
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# Macro definition
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fn = cache.group(1)
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elif cache.match('^DEF[A-Z0-9_]+\s*\(([a-zA-Z0-9_]+)', fn):
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# Supermacro
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fn = cache.group(1)
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elif cache.search(r'([a-zA-Z_][^()\s]*)\s*\([^*]', fn):
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# Discard template and function parameters.
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fn = cache.group(1)
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fn = re.sub(r'<[^<>]*>', '', fn)
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fn = fn.rstrip()
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else:
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fn = None
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if fn and fn not in fns: # Avoid dups
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fns.append(fn)
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fn = None
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return fns
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def parse_patch(contents):
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"""Parse patch contents to a sequence of FileDiffs."""
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diffs = []
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lines = contents.split('\n')
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i = 0
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while i < len(lines):
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line = lines[i]
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# Diff headers look like
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# --- a/gcc/tree.c
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# +++ b/gcc/tree.c
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# or
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# *** gcc/cfgexpand.c 2013-12-25 20:07:24.800350058 +0400
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# --- gcc/cfgexpand.c 2013-12-25 20:06:30.612350178 +0400
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if is_file_diff_start(line):
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left = re.split(r'\s+', line)[1]
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else:
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i += 1
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continue
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left = remove_suffixes(left);
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i += 1
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line = lines[i]
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if not cache.match(r'^[+-][+-][+-] +(\S+)', line):
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error("expected filename in line %d" % i)
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right = remove_suffixes(cache.group(1));
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# Extract real file name from left and right names.
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filename = None
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if left == right:
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filename = left
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elif left == '/dev/null':
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filename = right;
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elif right == '/dev/null':
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filename = left;
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else:
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comps = []
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while left and right:
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left, l = os.path.split(left)
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right, r = os.path.split(right)
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if l != r:
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break
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comps.append(l)
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if not comps:
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error("failed to extract common name for %s and %s" % (left, right))
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comps.reverse()
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filename = '/'.join(comps)
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d = FileDiff(filename)
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diffs.append(d)
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# Collect hunks for current file.
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hunk = None
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i += 1
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while i < len(lines):
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line = lines[i]
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# Create new hunk when we see hunk header
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if is_hunk_start(line):
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if hunk is not None:
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d.hunks.append(hunk)
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hunk = Hunk(line)
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i += 1
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continue
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# Stop when we reach next diff
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if (is_file_diff_start(line)
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or line.startswith('diff ')
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or line.startswith('Index: ')):
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i -= 1
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break
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if hunk is not None:
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hunk.lines.append(line)
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i += 1
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d.hunks.append(hunk)
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return diffs
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def main():
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name, email = read_user_info()
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try:
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opts, args = getopt.getopt(sys.argv[1:], 'hiv', ['help', 'verbose', 'inline'])
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except getopt.GetoptError, err:
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error(str(err))
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inline = False
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verbose = 0
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for o, a in opts:
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if o in ('-h', '--help'):
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print_help_and_exit()
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elif o in ('-i', '--inline'):
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inline = True
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elif o in ('-v', '--verbose'):
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verbose += 1
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else:
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assert False, "unhandled option"
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if len(args) == 0:
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args = ['-']
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if len(args) == 1 and args[0] == '-':
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input = sys.stdin
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elif len(args) == 1:
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input = open(args[0], 'rb')
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else:
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error("too many arguments; for more details run with -h")
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contents = input.read()
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diffs = parse_patch(contents)
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if verbose:
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print "Parse results:"
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for d in diffs:
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d.dump()
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# Generate template ChangeLog.
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logs = {}
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for d in diffs:
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log_name = d.clname
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logs.setdefault(log_name, '')
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logs[log_name] += '\t* %s' % d.relname
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change_msg = ''
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# Check if file was removed or added.
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# Two patterns for context and unified diff.
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if len(d.hunks) == 1:
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hunk0 = d.hunks[0]
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if hunk0.is_file_addition():
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if re.search(r'testsuite.*(?<!\.exp)$', d.filename):
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change_msg = ': New test.\n'
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else:
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change_msg = ": New file.\n"
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elif hunk0.is_file_removal():
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change_msg = ": Remove.\n"
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_, ext = os.path.splitext(d.filename)
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if not change_msg and ext in ['.c', '.cpp', '.C', '.cc', '.h', '.inc', '.def']:
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fns = []
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for hunk in d.hunks:
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for fn in find_changed_funs(hunk):
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if fn not in fns:
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fns.append(fn)
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for fn in fns:
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if change_msg:
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change_msg += "\t(%s):\n" % fn
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else:
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change_msg = " (%s):\n" % fn
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logs[log_name] += change_msg if change_msg else ":\n"
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if inline and args[0] != '-':
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# Get a temp filename, rather than an open filehandle, because we use
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# the open to truncate.
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fd, tmp = tempfile.mkstemp("tmp.XXXXXXXX")
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os.close(fd)
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# Copy permissions to temp file
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# (old Pythons do not support shutil.copymode)
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shutil.copymode(args[0], tmp)
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# Open the temp file, clearing contents.
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out = open(tmp, 'wb')
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else:
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tmp = None
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out = sys.stdout
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# Print log
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date = time.strftime('%Y-%m-%d')
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for log_name, msg in sorted(logs.iteritems()):
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out.write("""\
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%s:
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%s %s <%s>
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%s\n""" % (log_name, date, name, email, msg))
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if inline:
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# Append patch body
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out.write(contents)
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if args[0] != '-':
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# Write new contents atomically
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out.close()
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shutil.move(tmp, args[0])
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if __name__ == '__main__':
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main()
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