templates/filters: strip quotes from {author|person}

RFC5322 (Internet Message Format) [0] says that the 'display name' of
an internet address [1] (what Mercurial calls 'person') can be quoted
with DQUOTE (ASCII 34: ") if it contains non-atom characters [2].
For example, dot '.' is a non-atom character. Also, DQUOTEs in a
quoted string will be escaped using "\" [2][3].

The current {author|person} template+filter just extracts the part
before an email address as-is. This can look ugly, especially on the
web interface, or when generating output for post-processing...

Moreover, as an example, the Mercurial repository has a bunch of
incoherent uses of DQUOTES in author names. As per Matt's digging:

  $ hg log --template "{author|person}\n" | grep '"' | sort | uniq
  "Andrei Vermel
  "Aurelien Jacobs
  "Daniel Santa Cruz
  "Hidetaka Iwai
  "Hiroshi Funai"
  "Mathieu Clabaut
  "Paul Moore
  "Peter Arrenbrecht"
  "Rafael Villar Burke
  "Shun-ichi GOTO"
  "Wallace, Eric S"
  "Yann E. MORIN"
  Josef "Jeff" Sipek
  Radoslaw "AstralStorm" Szkodzinski

Fix the 'person' filter to remove leading and trailing DQUOTES,
and unescape remaining DQUOTES.

Given this author: "J. \"random\" DOE" <[e-mail]>
  before:   {author|person} : "J. \"random\" DOE"
  after:    {author|person} : J. "random" DOE

For the Mercurial repository, that leaves us with two authors with
DQUOTES, in acceptable positions:

  $ hg log --template "{author|person}\n" | grep '"' | sort | uniq
  Josef "Jeff" Sipek
  Radoslaw "AstralStorm" Szkodzinski

[0] https://tools.ietf.org/html/rfc5322
[1] https://tools.ietf.org/html/rfc5322#section-3.4
[2] https://tools.ietf.org/html/rfc5322#section-3.2.4
[3] https://tools.ietf.org/html/rfc5322#section-3.2.1

Signed-off-by: "Yann E. MORIN" <[e-mail]>

mercurial/templatefilters.py

@@ -1,372 +1,374
 # template-filters.py - common template expansion filters
 #
 # Copyright 2005-2008 Matt Mackall <[e-mail]>
 #
 # This software may be used and distributed according to the terms of the
 # GNU General Public License version 2 or any later version.
 
 import cgi, re, os, time, urllib
 import encoding, node, util
 import hbisect
 
 def addbreaks(text):
     """:addbreaks: Any text. Add an XHTML "<br />" tag before the end of
     every line except the last.
     """
     return text.replace('\n', '<br/>\n')
 
 agescales = [("year", 3600 * 24 * 365),
              ("month", 3600 * 24 * 30),
              ("week", 3600 * 24 * 7),
              ("day", 3600 * 24),
              ("hour", 3600),
              ("minute", 60),
              ("second", 1)]
 
 def age(date):
     """:age: Date. Returns a human-readable date/time difference between the
     given date/time and the current date/time.
     """
 
     def plural(t, c):
         if c == 1:
             return t
         return t + "s"
     def fmt(t, c):
         return "%d %s" % (c, plural(t, c))
 
     now = time.time()
     then = date[0]
     future = False
     if then > now:
         future = True
         delta = max(1, int(then - now))
         if delta > agescales[0][1] * 30:
             return 'in the distant future'
     else:
         delta = max(1, int(now - then))
         if delta > agescales[0][1] * 2:
             return util.shortdate(date)
 
     for t, s in agescales:
         n = delta // s
         if n >= 2 or s == 1:
             if future:
                 return '%s from now' % fmt(t, n)
             return '%s ago' % fmt(t, n)
 
 def basename(path):
     """:basename: Any text. Treats the text as a path, and returns the last
     component of the path after splitting by the path separator
     (ignoring trailing separators). For example, "foo/bar/baz" becomes
     "baz" and "foo/bar//" becomes "bar".
     """
     return os.path.basename(path)
 
 def datefilter(text):
     """:date: Date. Returns a date in a Unix date format, including the
     timezone: "Mon Sep 04 15:13:13 2006 0700".
     """
     return util.datestr(text)
 
 def domain(author):
     """:domain: Any text. Finds the first string that looks like an email
     address, and extracts just the domain component. Example: ``User
     <[e-mail]>`` becomes ``example.com``.
     """
     f = author.find('@')
     if f == -1:
         return ''
     author = author[f + 1:]
     f = author.find('>')
     if f >= 0:
         author = author[:f]
     return author
 
 def email(text):
     """:email: Any text. Extracts the first string that looks like an email
     address. Example: ``User <[e-mail]>`` becomes
     ``[e-mail]``.
     """
     return util.email(text)
 
 def escape(text):
     """:escape: Any text. Replaces the special XML/XHTML characters "&", "<"
     and ">" with XML entities.
     """
     return cgi.escape(text, True)
 
 para_re = None
 space_re = None
 
 def fill(text, width):
     '''fill many paragraphs.'''
     global para_re, space_re
     if para_re is None:
         para_re = re.compile('(\n\n|\n\\s*[-*]\\s*)', re.M)
         space_re = re.compile(r'  +')
 
     def findparas():
         start = 0
         while True:
             m = para_re.search(text, start)
             if not m:
                 uctext = unicode(text[start:], encoding.encoding)
                 w = len(uctext)
                 while 0 < w and uctext[w - 1].isspace():
                     w -= 1
                 yield (uctext[:w].encode(encoding.encoding),
                        uctext[w:].encode(encoding.encoding))
                 break
             yield text[start:m.start(0)], m.group(1)
             start = m.end(1)
 
     return "".join([space_re.sub(' ', util.wrap(para, width=width)) + rest
                     for para, rest in findparas()])
 
 def fill68(text):
     """:fill68: Any text. Wraps the text to fit in 68 columns."""
     return fill(text, 68)
 
 def fill76(text):
     """:fill76: Any text. Wraps the text to fit in 76 columns."""
     return fill(text, 76)
 
 def firstline(text):
     """:firstline: Any text. Returns the first line of text."""
     try:
         return text.splitlines(True)[0].rstrip('\r\n')
     except IndexError:
         return ''
 
 def hexfilter(text):
     """:hex: Any text. Convert a binary Mercurial node identifier into
     its long hexadecimal representation.
     """
     return node.hex(text)
 
 def hgdate(text):
     """:hgdate: Date. Returns the date as a pair of numbers: "1157407993
     25200" (Unix timestamp, timezone offset).
     """
     return "%d %d" % text
 
 def isodate(text):
     """:isodate: Date. Returns the date in ISO 8601 format: "2009-08-18 13:00
     +0200".
     """
     return util.datestr(text, '%Y-%m-%d %H:%M %1%2')
 
 def isodatesec(text):
     """:isodatesec: Date. Returns the date in ISO 8601 format, including
     seconds: "2009-08-18 13:00:13 +0200". See also the rfc3339date
     filter.
     """
     return util.datestr(text, '%Y-%m-%d %H:%M:%S %1%2')
 
 def indent(text, prefix):
     '''indent each non-empty line of text after first with prefix.'''
     lines = text.splitlines()
     num_lines = len(lines)
     endswithnewline = text[-1:] == '\n'
     def indenter():
         for i in xrange(num_lines):
             l = lines[i]
             if i and l.strip():
                 yield prefix
             yield l
             if i < num_lines - 1 or endswithnewline:
                 yield '\n'
     return "".join(indenter())
 
 def json(obj):
     if obj is None or obj is False or obj is True:
         return {None: 'null', False: 'false', True: 'true'}[obj]
     elif isinstance(obj, int) or isinstance(obj, float):
         return str(obj)
     elif isinstance(obj, str):
         u = unicode(obj, encoding.encoding, 'replace')
         return '"%s"' % jsonescape(u)
     elif isinstance(obj, unicode):
         return '"%s"' % jsonescape(obj)
     elif util.safehasattr(obj, 'keys'):
         out = []
         for k, v in obj.iteritems():
             s = '%s: %s' % (json(k), json(v))
             out.append(s)
         return '{' + ', '.join(out) + '}'
     elif util.safehasattr(obj, '__iter__'):
         out = []
         for i in obj:
             out.append(json(i))
         return '[' + ', '.join(out) + ']'
     else:
         raise TypeError('cannot encode type %s' % obj.__class__.__name__)
 
 def _uescape(c):
     if ord(c) < 0x80:
         return c
     else:
         return '\\u%04x' % ord(c)
 
 _escapes = [
     ('\\', '\\\\'), ('"', '\\"'), ('\t', '\\t'), ('\n', '\\n'),
     ('\r', '\\r'), ('\f', '\\f'), ('\b', '\\b'),
 ]
 
 def jsonescape(s):
     for k, v in _escapes:
         s = s.replace(k, v)
     return ''.join(_uescape(c) for c in s)
 
 def localdate(text):
     """:localdate: Date. Converts a date to local date."""
     return (text[0], util.makedate()[1])
 
 def nonempty(str):
     """:nonempty: Any text. Returns '(none)' if the string is empty."""
     return str or "(none)"
 
 def obfuscate(text):
     """:obfuscate: Any text. Returns the input text rendered as a sequence of
     XML entities.
     """
     text = unicode(text, encoding.encoding, 'replace')
     return ''.join(['&#%d;' % ord(c) for c in text])
 
 def permissions(flags):
     if "l" in flags:
         return "lrwxrwxrwx"
     if "x" in flags:
         return "-rwxr-xr-x"
     return "-rw-r--r--"
 
 def person(author):
-    """:person: Any text. Returns the text before an email address."""
+    """:person: Any text. Returns the name before an email address,
+    interpreting it as per RFC 5322.
+    """
     if not '@' in author:
         return author
     f = author.find('<')
     if f != -1:
-        return author[:f].rstrip()
+        return author[:f].strip(' "').replace('\\"', '"')
     f = author.find('@')
     return author[:f].replace('.', ' ')
 
 def rfc3339date(text):
     """:rfc3339date: Date. Returns a date using the Internet date format
     specified in RFC 3339: "2009-08-18T13:00:13+02:00".
     """
     return util.datestr(text, "%Y-%m-%dT%H:%M:%S%1:%2")
 
 def rfc822date(text):
     """:rfc822date: Date. Returns a date using the same format used in email
     headers: "Tue, 18 Aug 2009 13:00:13 +0200".
     """
     return util.datestr(text, "%a, %d %b %Y %H:%M:%S %1%2")
 
 def short(text):
     """:short: Changeset hash. Returns the short form of a changeset hash,
     i.e. a 12 hexadecimal digit string.
     """
     return text[:12]
 
 def shortbisect(text):
     """:shortbisect: Any text. Treats `text` as a bisection status, and
     returns a single-character representing the status (G: good, B: bad,
     S: skipped, U: untested, I: ignored). Returns single space if `text`
     is not a valid bisection status.
     """
     return hbisect.shortlabel(text) or ' '
 
 def shortdate(text):
     """:shortdate: Date. Returns a date like "2006-09-18"."""
     return util.shortdate(text)
 
 def stringescape(text):
     return text.encode('string_escape')
 
 def stringify(thing):
     """:stringify: Any type. Turns the value into text by converting values into
     text and concatenating them.
     """
     if util.safehasattr(thing, '__iter__') and not isinstance(thing, str):
         return "".join([stringify(t) for t in thing if t is not None])
     return str(thing)
 
 def strip(text):
     """:strip: Any text. Strips all leading and trailing whitespace."""
     return text.strip()
 
 def stripdir(text):
     """:stripdir: Treat the text as path and strip a directory level, if
     possible. For example, "foo" and "foo/bar" becomes "foo".
     """
     dir = os.path.dirname(text)
     if dir == "":
         return os.path.basename(text)
     else:
         return dir
 
 def tabindent(text):
     """:tabindent: Any text. Returns the text, with every line except the
     first starting with a tab character.
     """
     return indent(text, '\t')
 
 def urlescape(text):
     """:urlescape: Any text. Escapes all "special" characters. For example,
     "foo bar" becomes "foo%20bar".
     """
     return urllib.quote(text)
 
 def userfilter(text):
     """:user: Any text. Returns the user portion of an email address."""
     return util.shortuser(text)
 
 def xmlescape(text):
     text = (text
             .replace('&', '&amp;')
             .replace('<', '&lt;')
             .replace('>', '&gt;')
             .replace('"', '&quot;')
             .replace("'", '&#39;')) # &apos; invalid in HTML
     return re.sub('[\x00-\x08\x0B\x0C\x0E-\x1F]', ' ', text)
 
 filters = {
     "addbreaks": addbreaks,
     "age": age,
     "basename": basename,
     "date": datefilter,
     "domain": domain,
     "email": email,
     "escape": escape,
     "fill68": fill68,
     "fill76": fill76,
     "firstline": firstline,
     "hex": hexfilter,
     "hgdate": hgdate,
     "isodate": isodate,
     "isodatesec": isodatesec,
     "json": json,
     "jsonescape": jsonescape,
     "localdate": localdate,
     "nonempty": nonempty,
     "obfuscate": obfuscate,
     "permissions": permissions,
     "person": person,
     "rfc3339date": rfc3339date,
     "rfc822date": rfc822date,
     "short": short,
     "shortbisect": shortbisect,
     "shortdate": shortdate,
     "stringescape": stringescape,
     "stringify": stringify,
     "strip": strip,
     "stripdir": stripdir,
     "tabindent": tabindent,
     "urlescape": urlescape,
     "user": userfilter,
     "xmlescape": xmlescape,
 }
 
 # tell hggettext to extract docstrings from these functions:
 i18nfunctions = filters.values()