templates: add filter to reverse list

The filter supports only lists because for lists, it’s straightforward to
implement. Reversing text doesn’t seem very useful and is hard to implement.
Reversing the bytes would break multi-bytes encodings. Reversing the code
points would break characters consisting of multiple code points. Reversing
graphemes is non-trivial without using a library not included in the standard
library.

mercurial/templatefilters.py

@@ -1,551 +1,559
 # templatefilters.py - common template expansion filters
 #
 # Copyright 2005-2008 Olivia 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 os
 import re
 import time
 
 from .i18n import _
 from .node import hex
 from . import (
     encoding,
     error,
     pycompat,
     registrar,
     smartset,
     templateutil,
     url,
     util,
 )
 from .utils import (
     cborutil,
     dateutil,
     stringutil,
 )
 
 urlerr = util.urlerr
 urlreq = util.urlreq
 
 # filters are callables like:
 #   fn(obj)
 # with:
 #   obj - object to be filtered (text, date, list and so on)
 filters = {}
 
 templatefilter = registrar.templatefilter(filters)
 
 
 @templatefilter(b'addbreaks', intype=bytes)
 def addbreaks(text):
     """Any text. Add an XHTML "<br />" tag before the end of
     every line except the last.
     """
     return text.replace(b'\n', b'<br/>\n')
 
 
 agescales = [
     (b"year", 3600 * 24 * 365, b'Y'),
     (b"month", 3600 * 24 * 30, b'M'),
     (b"week", 3600 * 24 * 7, b'W'),
     (b"day", 3600 * 24, b'd'),
     (b"hour", 3600, b'h'),
     (b"minute", 60, b'm'),
     (b"second", 1, b's'),
 ]
 
 
 @templatefilter(b'age', intype=templateutil.date)
 def age(date, abbrev=False):
     """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 + b"s"
 
     def fmt(t, c, a):
         if abbrev:
             return b"%d%s" % (c, a)
         return b"%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 b'in the distant future'
     else:
         delta = max(1, int(now - then))
         if delta > agescales[0][1] * 2:
             return dateutil.shortdate(date)
 
     for t, s, a in agescales:
         n = delta // s
         if n >= 2 or s == 1:
             if future:
                 return b'%s from now' % fmt(t, n, a)
             return b'%s ago' % fmt(t, n, a)
 
 
 @templatefilter(b'basename', intype=bytes)
 def basename(path):
     """Any text. Treats the text as a path, and returns the last
     component of the path after splitting by the path separator.
     For example, "foo/bar/baz" becomes "baz" and "foo/bar//" becomes "".
     """
     return os.path.basename(path)
 
 
 def _tocborencodable(obj):
     if isinstance(obj, smartset.abstractsmartset):
         return list(obj)
     return obj
 
 
 @templatefilter(b'cbor')
 def cbor(obj):
     """Any object. Serializes the object to CBOR bytes."""
     # cborutil is stricter about type than json() filter
     obj = pycompat.rapply(_tocborencodable, obj)
     return b''.join(cborutil.streamencode(obj))
 
 
 @templatefilter(b'commondir')
 def commondir(filelist):
     """List of text. Treats each list item as file name with /
     as path separator and returns the longest common directory
     prefix shared by all list items.
     Returns the empty string if no common prefix exists.
 
     The list items are not normalized, i.e. "foo/../bar" is handled as
     file "bar" in the directory "foo/..". Leading slashes are ignored.
 
     For example, ["foo/bar/baz", "foo/baz/bar"] becomes "foo" and
     ["foo/bar", "baz"] becomes "".
     """
 
     def common(a, b):
         if len(a) > len(b):
             a = b[: len(a)]
         elif len(b) > len(a):
             b = b[: len(a)]
         if a == b:
             return a
         for i in range(len(a)):
             if a[i] != b[i]:
                 return a[:i]
         return a
 
     try:
         if not filelist:
             return b""
         dirlist = [f.lstrip(b'/').split(b'/')[:-1] for f in filelist]
         if len(dirlist) == 1:
             return b'/'.join(dirlist[0])
         a = min(dirlist)
         b = max(dirlist)
         # The common prefix of a and b is shared with all
         # elements of the list since Python sorts lexicographical
         # and [1, x] after [1].
         return b'/'.join(common(a, b))
     except TypeError:
         raise error.ParseError(_(b'argument is not a list of text'))
 
 
 @templatefilter(b'count')
 def count(i):
     """List or text. Returns the length as an integer."""
     try:
         return len(i)
     except TypeError:
         raise error.ParseError(_(b'not countable'))
 
 
 @templatefilter(b'dirname', intype=bytes)
 def dirname(path):
     """Any text. Treats the text as a path, and strips the last
     component of the path after splitting by the path separator.
     """
     return os.path.dirname(path)
 
 
 @templatefilter(b'domain', intype=bytes)
 def domain(author):
     """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(b'@')
     if f == -1:
         return b''
     author = author[f + 1 :]
     f = author.find(b'>')
     if f >= 0:
         author = author[:f]
     return author
 
 
 @templatefilter(b'email', intype=bytes)
 def email(text):
     """Any text. Extracts the first string that looks like an email
     address. Example: ``User <[e-mail]>`` becomes
     ``[e-mail]``.
     """
     return stringutil.email(text)
 
 
 @templatefilter(b'escape', intype=bytes)
 def escape(text):
     """Any text. Replaces the special XML/XHTML characters "&", "<"
     and ">" with XML entities, and filters out NUL characters.
     """
     return url.escape(text.replace(b'\0', b''), True)
 
 
 para_re = None
 space_re = None
 
 
 def fill(text, width, initindent=b'', hangindent=b''):
     '''fill many paragraphs with optional indentation.'''
     global para_re, space_re
     if para_re is None:
         para_re = re.compile(b'(\n\n|\n\\s*[-*]\\s*)', re.M)
         space_re = re.compile(br'  +')
 
     def findparas():
         start = 0
         while True:
             m = para_re.search(text, start)
             if not m:
                 uctext = encoding.unifromlocal(text[start:])
                 w = len(uctext)
                 while w > 0 and uctext[w - 1].isspace():
                     w -= 1
                 yield (
                     encoding.unitolocal(uctext[:w]),
                     encoding.unitolocal(uctext[w:]),
                 )
                 break
             yield text[start : m.start(0)], m.group(1)
             start = m.end(1)
 
     return b"".join(
         [
             stringutil.wrap(
                 space_re.sub(b' ', stringutil.wrap(para, width)),
                 width,
                 initindent,
                 hangindent,
             )
             + rest
             for para, rest in findparas()
         ]
     )
 
 
 @templatefilter(b'fill68', intype=bytes)
 def fill68(text):
     """Any text. Wraps the text to fit in 68 columns."""
     return fill(text, 68)
 
 
 @templatefilter(b'fill76', intype=bytes)
 def fill76(text):
     """Any text. Wraps the text to fit in 76 columns."""
     return fill(text, 76)
 
 
 @templatefilter(b'firstline', intype=bytes)
 def firstline(text):
     """Any text. Returns the first line of text."""
     return stringutil.firstline(text)
 
 
 @templatefilter(b'hex', intype=bytes)
 def hexfilter(text):
     """Any text. Convert a binary Mercurial node identifier into
     its long hexadecimal representation.
     """
     return hex(text)
 
 
 @templatefilter(b'hgdate', intype=templateutil.date)
 def hgdate(text):
     """Date. Returns the date as a pair of numbers: "1157407993
     25200" (Unix timestamp, timezone offset).
     """
     return b"%d %d" % text
 
 
 @templatefilter(b'isodate', intype=templateutil.date)
 def isodate(text):
     """Date. Returns the date in ISO 8601 format: "2009-08-18 13:00
     +0200".
     """
     return dateutil.datestr(text, b'%Y-%m-%d %H:%M %1%2')
 
 
 @templatefilter(b'isodatesec', intype=templateutil.date)
 def isodatesec(text):
     """Date. Returns the date in ISO 8601 format, including
     seconds: "2009-08-18 13:00:13 +0200". See also the rfc3339date
     filter.
     """
     return dateutil.datestr(text, b'%Y-%m-%d %H:%M:%S %1%2')
 
 
 def indent(text, prefix, firstline=b''):
     '''indent each non-empty line of text after first with prefix.'''
     lines = text.splitlines()
     num_lines = len(lines)
     endswithnewline = text[-1:] == b'\n'
 
     def indenter():
         for i in range(num_lines):
             l = lines[i]
             if l.strip():
                 yield prefix if i else firstline
             yield l
             if i < num_lines - 1 or endswithnewline:
                 yield b'\n'
 
     return b"".join(indenter())
 
 
 @templatefilter(b'json')
 def json(obj, paranoid=True):
     """Any object. Serializes the object to a JSON formatted text."""
     if obj is None:
         return b'null'
     elif obj is False:
         return b'false'
     elif obj is True:
         return b'true'
     elif isinstance(obj, (int, int, float)):
         return pycompat.bytestr(obj)
     elif isinstance(obj, bytes):
         return b'"%s"' % encoding.jsonescape(obj, paranoid=paranoid)
     elif isinstance(obj, type(u'')):
         raise error.ProgrammingError(
             b'Mercurial only does output with bytes: %r' % obj
         )
     elif util.safehasattr(obj, b'keys'):
         out = [
             b'"%s": %s'
             % (encoding.jsonescape(k, paranoid=paranoid), json(v, paranoid))
             for k, v in sorted(obj.items())
         ]
         return b'{' + b', '.join(out) + b'}'
     elif util.safehasattr(obj, b'__iter__'):
         out = [json(i, paranoid) for i in obj]
         return b'[' + b', '.join(out) + b']'
     raise error.ProgrammingError(b'cannot encode %r' % obj)
 
 
 @templatefilter(b'lower', intype=bytes)
 def lower(text):
     """Any text. Converts the text to lowercase."""
     return encoding.lower(text)
 
 
 @templatefilter(b'nonempty', intype=bytes)
 def nonempty(text):
     """Any text. Returns '(none)' if the string is empty."""
     return text or b"(none)"
 
 
 @templatefilter(b'obfuscate', intype=bytes)
 def obfuscate(text):
     """Any text. Returns the input text rendered as a sequence of
     XML entities.
     """
     text = str(text, pycompat.sysstr(encoding.encoding), r'replace')
     return b''.join([b'&#%d;' % ord(c) for c in text])
 
 
 @templatefilter(b'permissions', intype=bytes)
 def permissions(flags):
     if b"l" in flags:
         return b"lrwxrwxrwx"
     if b"x" in flags:
         return b"-rwxr-xr-x"
     return b"-rw-r--r--"
 
 
 @templatefilter(b'person', intype=bytes)
 def person(author):
     """Any text. Returns the name before an email address,
     interpreting it as per RFC 5322.
     """
     return stringutil.person(author)
 
 
+@templatefilter(b'reverse')
+def reverse(list_):
+    """List. Reverses the order of list items."""
+    if isinstance(list_, list):
+        return templateutil.hybridlist(list_[::-1], name=b'item')
+    raise error.ParseError(_(b'not reversible'))
+
+
 @templatefilter(b'revescape', intype=bytes)
 def revescape(text):
     """Any text. Escapes all "special" characters, except @.
     Forward slashes are escaped twice to prevent web servers from prematurely
     unescaping them. For example, "@foo bar/baz" becomes "@foo%20bar%252Fbaz".
     """
     return urlreq.quote(text, safe=b'/@').replace(b'/', b'%252F')
 
 
 @templatefilter(b'rfc3339date', intype=templateutil.date)
 def rfc3339date(text):
     """Date. Returns a date using the Internet date format
     specified in RFC 3339: "2009-08-18T13:00:13+02:00".
     """
     return dateutil.datestr(text, b"%Y-%m-%dT%H:%M:%S%1:%2")
 
 
 @templatefilter(b'rfc822date', intype=templateutil.date)
 def rfc822date(text):
     """Date. Returns a date using the same format used in email
     headers: "Tue, 18 Aug 2009 13:00:13 +0200".
     """
     return dateutil.datestr(text, b"%a, %d %b %Y %H:%M:%S %1%2")
 
 
 @templatefilter(b'short', intype=bytes)
 def short(text):
     """Changeset hash. Returns the short form of a changeset hash,
     i.e. a 12 hexadecimal digit string.
     """
     return text[:12]
 
 
 @templatefilter(b'shortbisect', intype=bytes)
 def shortbisect(label):
     """Any text. Treats `label` 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.
     """
     if label:
         return label[0:1].upper()
     return b' '
 
 
 @templatefilter(b'shortdate', intype=templateutil.date)
 def shortdate(text):
     """Date. Returns a date like "2006-09-18"."""
     return dateutil.shortdate(text)
 
 
 @templatefilter(b'slashpath', intype=bytes)
 def slashpath(path):
     """Any text. Replaces the native path separator with slash."""
     return util.pconvert(path)
 
 
 @templatefilter(b'splitlines', intype=bytes)
 def splitlines(text):
     """Any text. Split text into a list of lines."""
     return templateutil.hybridlist(text.splitlines(), name=b'line')
 
 
 @templatefilter(b'stringescape', intype=bytes)
 def stringescape(text):
     return stringutil.escapestr(text)
 
 
 @templatefilter(b'stringify', intype=bytes)
 def stringify(thing):
     """Any type. Turns the value into text by converting values into
     text and concatenating them.
     """
     return thing  # coerced by the intype
 
 
 @templatefilter(b'stripdir', intype=bytes)
 def stripdir(text):
     """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 == b"":
         return os.path.basename(text)
     else:
         return dir
 
 
 @templatefilter(b'tabindent', intype=bytes)
 def tabindent(text):
     """Any text. Returns the text, with every non-empty line
     except the first starting with a tab character.
     """
     return indent(text, b'\t')
 
 
 @templatefilter(b'upper', intype=bytes)
 def upper(text):
     """Any text. Converts the text to uppercase."""
     return encoding.upper(text)
 
 
 @templatefilter(b'urlescape', intype=bytes)
 def urlescape(text):
     """Any text. Escapes all "special" characters. For example,
     "foo bar" becomes "foo%20bar".
     """
     return urlreq.quote(text)
 
 
 @templatefilter(b'user', intype=bytes)
 def userfilter(text):
     """Any text. Returns a short representation of a user name or email
     address."""
     return stringutil.shortuser(text)
 
 
 @templatefilter(b'emailuser', intype=bytes)
 def emailuser(text):
     """Any text. Returns the user portion of an email address."""
     return stringutil.emailuser(text)
 
 
 @templatefilter(b'utf8', intype=bytes)
 def utf8(text):
     """Any text. Converts from the local character encoding to UTF-8."""
     return encoding.fromlocal(text)
 
 
 @templatefilter(b'xmlescape', intype=bytes)
 def xmlescape(text):
     text = (
         text.replace(b'&', b'&amp;')
         .replace(b'<', b'&lt;')
         .replace(b'>', b'&gt;')
         .replace(b'"', b'&quot;')
         .replace(b"'", b'&#39;')
     )  # &apos; invalid in HTML
     return re.sub(b'[\x00-\x08\x0B\x0C\x0E-\x1F]', b' ', text)
 
 
 def websub(text, websubtable):
     """:websub: Any text. Only applies to hgweb. Applies the regular
     expression replacements defined in the websub section.
     """
     if websubtable:
         for regexp, format in websubtable:
             text = regexp.sub(format, text)
     return text
 
 
 def loadfilter(ui, extname, registrarobj):
     """Load template filter from specified registrarobj"""
     for name, func in registrarobj._table.items():
         filters[name] = func
 
 
 # tell hggettext to extract docstrings from these functions:
 i18nfunctions = filters.values()

tests/test-template-functions.t

@@ -1,1721 +1,1736
 Test template filters and functions
 ===================================
 
   $ hg init a
   $ cd a
   $ echo a > a
   $ hg add a
   $ echo line 1 > b
   $ echo line 2 >> b
   $ hg commit -l b -d '1000000 0' -u 'User Name <user@hostname>'
 
   $ hg add b
   $ echo other 1 > c
   $ echo other 2 >> c
   $ echo >> c
   $ echo other 3 >> c
   $ hg commit -l c -d '1100000 0' -u 'A. N. Other <other@place>'
 
   $ hg add c
   $ hg commit -m 'no person' -d '1200000 0' -u 'other@place'
   $ echo c >> c
   $ hg commit -m 'no user, no domain' -d '1300000 0' -u 'person'
 
   $ echo foo > .hg/branch
   $ hg commit -m 'new branch' -d '1400000 0' -u 'person'
 
   $ hg co -q 3
   $ echo other 4 >> d
   $ hg add d
   $ hg commit -m 'new head' -d '1500000 0' -u 'person'
 
   $ hg merge -q foo
   $ hg commit -m 'merge' -d '1500001 0' -u 'person'
 
 Second branch starting at nullrev:
 
   $ hg update null
   0 files updated, 0 files merged, 4 files removed, 0 files unresolved
   $ echo second > second
   $ hg add second
   $ hg commit -m second -d '1000000 0' -u 'User Name <user@hostname>'
   created new head
 
   $ echo third > third
   $ hg add third
   $ hg mv second fourth
   $ hg commit -m third -d "2020-01-01 10:01"
 
   $ hg phase -r 5 --public
   $ hg phase -r 7 --secret --force
 
 Filters work:
 
   $ hg log --template '{author|domain}\n'
   
   hostname
   
   
   
   
   place
   place
   hostname
 
   $ hg log --template '{author|person}\n'
   test
   User Name
   person
   person
   person
   person
   other
   A. N. Other
   User Name
 
   $ hg log --template '{author|user}\n'
   test
   user
   person
   person
   person
   person
   other
   other
   user
 
   $ hg log --template '{date|date}\n'
   Wed Jan 01 10:01:00 2020 +0000
   Mon Jan 12 13:46:40 1970 +0000
   Sun Jan 18 08:40:01 1970 +0000
   Sun Jan 18 08:40:00 1970 +0000
   Sat Jan 17 04:53:20 1970 +0000
   Fri Jan 16 01:06:40 1970 +0000
   Wed Jan 14 21:20:00 1970 +0000
   Tue Jan 13 17:33:20 1970 +0000
   Mon Jan 12 13:46:40 1970 +0000
 
   $ hg log --template '{date|isodate}\n'
   2020-01-01 10:01 +0000
   1970-01-12 13:46 +0000
   1970-01-18 08:40 +0000
   1970-01-18 08:40 +0000
   1970-01-17 04:53 +0000
   1970-01-16 01:06 +0000
   1970-01-14 21:20 +0000
   1970-01-13 17:33 +0000
   1970-01-12 13:46 +0000
 
   $ hg log --template '{date|isodatesec}\n'
   2020-01-01 10:01:00 +0000
   1970-01-12 13:46:40 +0000
   1970-01-18 08:40:01 +0000
   1970-01-18 08:40:00 +0000
   1970-01-17 04:53:20 +0000
   1970-01-16 01:06:40 +0000
   1970-01-14 21:20:00 +0000
   1970-01-13 17:33:20 +0000
   1970-01-12 13:46:40 +0000
 
   $ hg log --template '{date|rfc822date}\n'
   Wed, 01 Jan 2020 10:01:00 +0000
   Mon, 12 Jan 1970 13:46:40 +0000
   Sun, 18 Jan 1970 08:40:01 +0000
   Sun, 18 Jan 1970 08:40:00 +0000
   Sat, 17 Jan 1970 04:53:20 +0000
   Fri, 16 Jan 1970 01:06:40 +0000
   Wed, 14 Jan 1970 21:20:00 +0000
   Tue, 13 Jan 1970 17:33:20 +0000
   Mon, 12 Jan 1970 13:46:40 +0000
 
   $ hg log --template '{desc|firstline}\n'
   third
   second
   merge
   new head
   new branch
   no user, no domain
   no person
   other 1
   line 1
 
   $ hg log --template '{node|short}\n'
   95c24699272e
   29114dbae42b
   d41e714fe50d
   13207e5a10d9
   bbe44766e73d
   10e46f2dcbf4
   97054abb4ab8
   b608e9d1a3f0
   1e4e1b8f71e0
 
   $ hg log --template '<changeset author="{author|xmlescape}"/>\n'
   <changeset author="test"/>
   <changeset author="User Name &lt;user@hostname&gt;"/>
   <changeset author="person"/>
   <changeset author="person"/>
   <changeset author="person"/>
   <changeset author="person"/>
   <changeset author="other@place"/>
   <changeset author="A. N. Other &lt;other@place&gt;"/>
   <changeset author="User Name &lt;user@hostname&gt;"/>
 
   $ hg log --template '{rev}: {children}\n'
   8: 
   7: 8:95c24699272e
   6: 
   5: 6:d41e714fe50d
   4: 6:d41e714fe50d
   3: 4:bbe44766e73d 5:13207e5a10d9
   2: 3:10e46f2dcbf4
   1: 2:97054abb4ab8
   0: 1:b608e9d1a3f0
 
 Formatnode filter works:
 
   $ hg -q log -r 0 --template '{node|formatnode}\n'
   1e4e1b8f71e0
 
   $ hg log -r 0 --template '{node|formatnode}\n'
   1e4e1b8f71e0
 
   $ hg -v log -r 0 --template '{node|formatnode}\n'
   1e4e1b8f71e0
 
   $ hg --debug log -r 0 --template '{node|formatnode}\n'
   1e4e1b8f71e05681d422154f5421e385fec3454f
 
 Age filter:
 
   $ hg init unstable-hash
   $ cd unstable-hash
   $ hg log --template '{date|age}\n' > /dev/null || exit 1
 
   >>> import datetime
   >>> fp = open('a', 'wb')
   >>> n = datetime.datetime.now() + datetime.timedelta(366 * 7)
   >>> fp.write(b'%d-%d-%d 00:00' % (n.year, n.month, n.day)) and None
   >>> fp.close()
   $ hg add a
   $ hg commit -m future -d "`cat a`"
 
   $ hg log -l1 --template '{date|age}\n'
   7 years from now
 
   $ cd ..
   $ rm -rf unstable-hash
 
 Filename filters:
 
   $ hg debugtemplate '{"foo/bar"|basename}|{"foo/"|basename}|{"foo"|basename}|\n'
   bar||foo|
   $ hg debugtemplate '{"foo/bar"|dirname}|{"foo/"|dirname}|{"foo"|dirname}|\n'
   foo|foo||
   $ hg debugtemplate '{"foo/bar"|stripdir}|{"foo/"|stripdir}|{"foo"|stripdir}|\n'
   foo|foo|foo|
 
 commondir() filter:
 
   $ hg debugtemplate '{""|splitlines|commondir}\n'
   
   $ hg debugtemplate '{"foo/bar\nfoo/baz\nfoo/foobar\n"|splitlines|commondir}\n'
   foo
   $ hg debugtemplate '{"foo/bar\nfoo/bar\n"|splitlines|commondir}\n'
   foo
   $ hg debugtemplate '{"/foo/bar\n/foo/bar\n"|splitlines|commondir}\n'
   foo
   $ hg debugtemplate '{"/foo\n/foo\n"|splitlines|commondir}\n'
   
   $ hg debugtemplate '{"foo/bar\nbar/baz"|splitlines|commondir}\n'
   
   $ hg debugtemplate '{"foo/bar\nbar/baz\nbar/foo\n"|splitlines|commondir}\n'
   
   $ hg debugtemplate '{"foo/../bar\nfoo/bar"|splitlines|commondir}\n'
   foo
   $ hg debugtemplate '{"foo\n/foo"|splitlines|commondir}\n'
   
 
   $ hg log -r null -T '{rev|commondir}'
   hg: parse error: argument is not a list of text
   (template filter 'commondir' is not compatible with keyword 'rev')
   [10]
 
 Add a dummy commit to make up for the instability of the above:
 
   $ echo a > a
   $ hg add a
   $ hg ci -m future
 
 Count filter:
 
   $ hg log -l1 --template '{node|count} {node|short|count}\n'
   40 12
 
   $ hg log -l1 --template '{revset("null^")|count} {revset(".")|count} {revset("0::3")|count}\n'
   0 1 4
 
   $ hg log -G --template '{rev}: children: {children|count}, \
   > tags: {tags|count}, file_adds: {file_adds|count}, \
   > ancestors: {revset("ancestors(%s)", rev)|count}'
   @  9: children: 0, tags: 1, file_adds: 1, ancestors: 3
   |
   o  8: children: 1, tags: 0, file_adds: 2, ancestors: 2
   |
   o  7: children: 1, tags: 0, file_adds: 1, ancestors: 1
   
   o    6: children: 0, tags: 0, file_adds: 0, ancestors: 7
   |\
   | o  5: children: 1, tags: 0, file_adds: 1, ancestors: 5
   | |
   o |  4: children: 1, tags: 0, file_adds: 0, ancestors: 5
   |/
   o  3: children: 2, tags: 0, file_adds: 0, ancestors: 4
   |
   o  2: children: 1, tags: 0, file_adds: 1, ancestors: 3
   |
   o  1: children: 1, tags: 0, file_adds: 1, ancestors: 2
   |
   o  0: children: 1, tags: 0, file_adds: 1, ancestors: 1
   
 
   $ hg log -l1 -T '{termwidth|count}\n'
   hg: parse error: not countable
   (template filter 'count' is not compatible with keyword 'termwidth')
   [10]
 
 Upper/lower filters:
 
   $ hg log -r0 --template '{branch|upper}\n'
   DEFAULT
   $ hg log -r0 --template '{author|lower}\n'
   user name <user@hostname>
   $ hg log -r0 --template '{date|upper}\n'
   1000000.00
 
 Add a commit that does all possible modifications at once
 
   $ echo modify >> third
   $ touch b
   $ hg add b
   $ hg mv fourth fifth
   $ hg rm a
   $ hg ci -m "Modify, add, remove, rename"
 
 Pass generator object created by template function to filter
 
   $ hg log -l 1 --template '{if(author, author)|user}\n'
   test
 
 Test diff function:
 
   $ hg diff -c 8
   diff -r 29114dbae42b -r 95c24699272e fourth
   --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
   +++ b/fourth	Wed Jan 01 10:01:00 2020 +0000
   @@ -0,0 +1,1 @@
   +second
   diff -r 29114dbae42b -r 95c24699272e second
   --- a/second	Mon Jan 12 13:46:40 1970 +0000
   +++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
   @@ -1,1 +0,0 @@
   -second
   diff -r 29114dbae42b -r 95c24699272e third
   --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
   +++ b/third	Wed Jan 01 10:01:00 2020 +0000
   @@ -0,0 +1,1 @@
   +third
 
   $ hg log -r 8 -T "{diff()}"
   diff -r 29114dbae42b -r 95c24699272e fourth
   --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
   +++ b/fourth	Wed Jan 01 10:01:00 2020 +0000
   @@ -0,0 +1,1 @@
   +second
   diff -r 29114dbae42b -r 95c24699272e second
   --- a/second	Mon Jan 12 13:46:40 1970 +0000
   +++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
   @@ -1,1 +0,0 @@
   -second
   diff -r 29114dbae42b -r 95c24699272e third
   --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
   +++ b/third	Wed Jan 01 10:01:00 2020 +0000
   @@ -0,0 +1,1 @@
   +third
 
   $ hg log -r 8 -T "{diff('glob:f*')}"
   diff -r 29114dbae42b -r 95c24699272e fourth
   --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
   +++ b/fourth	Wed Jan 01 10:01:00 2020 +0000
   @@ -0,0 +1,1 @@
   +second
 
   $ hg log -r 8 -T "{diff('', 'glob:f*')}"
   diff -r 29114dbae42b -r 95c24699272e second
   --- a/second	Mon Jan 12 13:46:40 1970 +0000
   +++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
   @@ -1,1 +0,0 @@
   -second
   diff -r 29114dbae42b -r 95c24699272e third
   --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
   +++ b/third	Wed Jan 01 10:01:00 2020 +0000
   @@ -0,0 +1,1 @@
   +third
 
   $ hg log -r 8 -T "{diff('FOURTH'|lower)}"
   diff -r 29114dbae42b -r 95c24699272e fourth
   --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
   +++ b/fourth	Wed Jan 01 10:01:00 2020 +0000
   @@ -0,0 +1,1 @@
   +second
 
   $ hg --config diff.git=true log -r 8 -T "{diff()}"
   diff --git a/second b/fourth
   rename from second
   rename to fourth
   diff --git a/third b/third
   new file mode 100644
   --- /dev/null
   +++ b/third
   @@ -0,0 +1,1 @@
   +third
 
   $ cd ..
 
 latesttag() function:
 
   $ hg init latesttag
   $ cd latesttag
 
   $ echo a > file
   $ hg ci -Am a -d '0 0'
   adding file
 
   $ echo b >> file
   $ hg ci -m b -d '1 0'
 
   $ echo c >> head1
   $ hg ci -Am h1c -d '2 0'
   adding head1
 
   $ hg update -q 1
   $ echo d >> head2
   $ hg ci -Am h2d -d '3 0'
   adding head2
   created new head
 
   $ echo e >> head2
   $ hg ci -m h2e -d '4 0'
 
   $ hg merge -q
   $ hg ci -m merge -d '5 -3600'
 
   $ hg tag -r 1 -m t1 -d '6 0' t1
   $ hg tag -r 2 -m t2 -d '7 0' t2
   $ hg tag -r 3 -m t3 -d '8 0' t3
   $ hg tag -r 4 -m t4 -d '4 0' t4 # older than t2, but should not matter
   $ hg tag -r 5 -m t5 -d '9 0' t5
   $ hg tag -r 3 -m at3 -d '10 0' at3
 
   $ hg log -G --template "{rev}: {latesttag('re:^t[13]$') % '{tag}, C: {changes}, D: {distance}'}\n"
   @  11: t3, C: 9, D: 8
   |
   o  10: t3, C: 8, D: 7
   |
   o  9: t3, C: 7, D: 6
   |
   o  8: t3, C: 6, D: 5
   |
   o  7: t3, C: 5, D: 4
   |
   o  6: t3, C: 4, D: 3
   |
   o    5: t3, C: 3, D: 2
   |\
   | o  4: t3, C: 1, D: 1
   | |
   | o  3: t3, C: 0, D: 0
   | |
   o |  2: t1, C: 1, D: 1
   |/
   o  1: t1, C: 0, D: 0
   |
   o  0: null, C: 1, D: 1
   
 
   $ cd ..
 
 Test filter() empty values:
 
   $ hg log -R a -r 1 -T '{filter(desc|splitlines) % "{line}\n"}'
   other 1
   other 2
   other 3
   $ hg log -R a -r 0 -T '{filter(dict(a=0, b=1) % "{ifeq(key, "a", "{value}\n")}")}'
   0
 
  0 should not be falsy
 
   $ hg log -R a -r 0 -T '{filter(revset("0:2"))}\n'
   0 1 2
 
 Test filter() by expression:
 
   $ hg log -R a -r 1 -T '{filter(desc|splitlines, ifcontains("1", line, "t"))}\n'
   other 1
   $ hg log -R a -r 0 -T '{filter(dict(a=0, b=1), ifeq(key, "b", "t"))}\n'
   b=1
 
 Test filter() shouldn't crash:
 
   $ hg log -R a -r 0 -T '{filter(extras)}\n'
   branch=default
   $ hg log -R a -r 0 -T '{filter(files)}\n'
   a
 
 Test filter() unsupported arguments:
 
   $ hg log -R a -r 0 -T '{filter()}\n'
   hg: parse error: filter expects one or two arguments
   [10]
   $ hg log -R a -r 0 -T '{filter(date)}\n'
   hg: parse error: date is not iterable
   [10]
   $ hg log -R a -r 0 -T '{filter(rev)}\n'
   hg: parse error: 0 is not iterable
   [10]
   $ hg log -R a -r 0 -T '{filter(desc|firstline)}\n'
   hg: parse error: 'line 1' is not filterable
   [10]
   $ hg log -R a -r 0 -T '{filter(manifest)}\n'
   hg: parse error: '0:a0c8bcbbb45c' is not filterable
   [10]
   $ hg log -R a -r 0 -T '{filter(succsandmarkers)}\n'
   hg: parse error: not filterable without template
   [10]
   $ hg log -R a -r 0 -T '{filter(desc|splitlines % "{line}", "")}\n'
   hg: parse error: not filterable by expression
   [10]
 
 Test manifest/get() can be join()-ed as string, though it's silly:
 
   $ hg log -R latesttag -r tip -T '{join(manifest, ".")}\n'
   1.1.:.2.b.c.6.e.9.0.0.6.c.e.2
   $ hg log -R latesttag -r tip -T '{join(get(extras, "branch"), ".")}\n'
   d.e.f.a.u.l.t
 
 Test join() over string
 
   $ hg log -R latesttag -r tip -T '{join(rev|stringify, ".")}\n'
   1.1
 
 Test join() over uniterable
 
   $ hg log -R latesttag -r tip -T '{join(rev, "")}\n'
   hg: parse error: 11 is not iterable
   [10]
 
 Test min/max of integers
 
   $ hg log -R latesttag -l1 -T '{min(revset("9:10"))}\n'
   9
   $ hg log -R latesttag -l1 -T '{max(revset("9:10"))}\n'
   10
 
 Test min/max over map operation:
 
   $ hg log -R latesttag -r3 -T '{min(tags % "{tag}")}\n'
   at3
   $ hg log -R latesttag -r3 -T '{max(tags % "{tag}")}\n'
   t3
 
 Test min/max of strings:
 
   $ hg log -R latesttag -l1 -T '{min(desc)}\n'
   3
   $ hg log -R latesttag -l1 -T '{max(desc)}\n'
   t
 
 Test min/max of non-iterable:
 
   $ hg debugtemplate '{min(1)}'
   hg: parse error: 1 is not iterable
   (min first argument should be an iterable)
   [10]
   $ hg debugtemplate '{max(2)}'
   hg: parse error: 2 is not iterable
   (max first argument should be an iterable)
   [10]
 
   $ hg log -R latesttag -l1 -T '{min(date)}'
   hg: parse error: date is not iterable
   (min first argument should be an iterable)
   [10]
   $ hg log -R latesttag -l1 -T '{max(date)}'
   hg: parse error: date is not iterable
   (max first argument should be an iterable)
   [10]
 
 Test min/max of empty sequence:
 
   $ hg debugtemplate '{min("")}'
   hg: parse error: empty string
   (min first argument should be an iterable)
   [10]
   $ hg debugtemplate '{max("")}'
   hg: parse error: empty string
   (max first argument should be an iterable)
   [10]
   $ hg debugtemplate '{min(dict())}'
   hg: parse error: empty sequence
   (min first argument should be an iterable)
   [10]
   $ hg debugtemplate '{max(dict())}'
   hg: parse error: empty sequence
   (max first argument should be an iterable)
   [10]
   $ hg debugtemplate '{min(dict() % "")}'
   hg: parse error: empty sequence
   (min first argument should be an iterable)
   [10]
   $ hg debugtemplate '{max(dict() % "")}'
   hg: parse error: empty sequence
   (max first argument should be an iterable)
   [10]
 
 Test min/max of if() result
 
   $ cd latesttag
   $ hg log -l1 -T '{min(if(true, revset("9:10"), ""))}\n'
   9
   $ hg log -l1 -T '{max(if(false, "", revset("9:10")))}\n'
   10
   $ hg log -l1 -T '{min(ifcontains("a", "aa", revset("9:10"), ""))}\n'
   9
   $ hg log -l1 -T '{max(ifcontains("a", "bb", "", revset("9:10")))}\n'
   10
   $ hg log -l1 -T '{min(ifeq(0, 0, revset("9:10"), ""))}\n'
   9
   $ hg log -l1 -T '{max(ifeq(0, 1, "", revset("9:10")))}\n'
   10
   $ cd ..
 
 Test laziness of if() then/else clause
 
   $ hg debugtemplate '{count(0)}'
   hg: parse error: not countable
   (incompatible use of template filter 'count')
   [10]
   $ hg debugtemplate '{if(true, "", count(0))}'
   $ hg debugtemplate '{if(false, count(0), "")}'
   $ hg debugtemplate '{ifcontains("a", "aa", "", count(0))}'
   $ hg debugtemplate '{ifcontains("a", "bb", count(0), "")}'
   $ hg debugtemplate '{ifeq(0, 0, "", count(0))}'
   $ hg debugtemplate '{ifeq(0, 1, count(0), "")}'
 
 Test search() function:
 
   $ hg log -R a -r2 -T '{desc}\n'
   no person
 
   $ hg log -R a -r2 -T '{search(r"p.*", desc)}\n'
   person
 
  as bool
 
   $ hg log -R a -r2 -T '{if(search(r"p.*", desc), "", "not ")}found\n'
   found
   $ hg log -R a -r2 -T '{if(search(r"q", desc), "", "not ")}found\n'
   not found
 
  match as json
 
   $ hg log -R a -r2 -T '{search(r"(no) p.*", desc)|json}\n'
   {"0": "no person", "1": "no"}
   $ hg log -R a -r2 -T '{search(r"q", desc)|json}\n'
   null
 
  group reference
 
   $ hg log -R a -r2 -T '{search(r"(no) (p.*)", desc) % "{1|upper} {2|hex}"}\n'
   NO 706572736f6e
   $ hg log -R a -r2 -T '{search(r"(?P<foo>[a-z]*)", desc) % "{foo}"}\n'
   no
   $ hg log -R a -r2 -T '{search(r"(?P<foo>[a-z]*)", desc).foo}\n'
   no
 
  group reference with no match
 
   $ hg log -R a -r2 -T '{search(r"q", desc) % "match: {0}"}\n'
   
 
  bad group names
 
   $ hg log -R a -r2 -T '{search(r"(?P<0>.)", desc) % "{0}"}\n'
   hg: parse error: search got an invalid pattern: (?P<0>.)
   [10]
   $ hg log -R a -r2 -T '{search(r"(?P<repo>.)", desc) % "{repo}"}\n'
   hg: parse error: invalid group 'repo' in search pattern: (?P<repo>.)
   [10]
 
 Test the sub function of templating for expansion:
 
   $ hg log -R latesttag -r 10 --template '{sub("[0-9]", "x", "{rev}")}\n'
   xx
 
   $ hg log -R latesttag -r 10 -T '{sub("[", "x", rev)}\n'
   hg: parse error: sub got an invalid pattern: [
   [10]
   $ hg log -R latesttag -r 10 -T '{sub("[0-9]", r"\1", rev)}\n'
   hg: parse error: sub got an invalid replacement: \1
   [10]
 
 Test the strip function with chars specified:
 
   $ hg log -R latesttag --template '{desc}\n'
   at3
   t5
   t4
   t3
   t2
   t1
   merge
   h2e
   h2d
   h1c
   b
   a
 
   $ hg log -R latesttag --template '{strip(desc, "te")}\n'
   at3
   5
   4
   3
   2
   1
   merg
   h2
   h2d
   h1c
   b
   a
 
 Test date format:
 
   $ hg log -R latesttag --template 'date: {date(date, "%y %m %d %S %z")}\n'
   date: 70 01 01 10 +0000
   date: 70 01 01 09 +0000
   date: 70 01 01 04 +0000
   date: 70 01 01 08 +0000
   date: 70 01 01 07 +0000
   date: 70 01 01 06 +0000
   date: 70 01 01 05 +0100
   date: 70 01 01 04 +0000
   date: 70 01 01 03 +0000
   date: 70 01 01 02 +0000
   date: 70 01 01 01 +0000
   date: 70 01 01 00 +0000
 
 Test invalid date:
 
   $ hg log -R latesttag -T '{date(rev)}\n'
   hg: parse error: date expects a date information
   [10]
 
 Set up repository containing template fragments in commit metadata:
 
   $ hg init r
   $ cd r
   $ echo a > a
   $ hg ci -Am '{rev}'
   adding a
 
   $ hg branch -q 'text.{rev}'
   $ echo aa >> aa
   $ hg ci -u '{node|short}' -m 'desc to be wrapped desc to be wrapped'
 
 color effect can be specified without quoting:
 
   $ hg log --color=always -l 1 --template '{label(red, "text\n")}'
   \x1b[0;31mtext\x1b[0m (esc)
 
 color effects can be nested (issue5413)
 
   $ hg debugtemplate --color=always \
   > '{label(red, "red{label(magenta, "ma{label(cyan, "cyan")}{label(yellow, "yellow")}genta")}")}\n'
   \x1b[0;31mred\x1b[0;35mma\x1b[0;36mcyan\x1b[0m\x1b[0;31m\x1b[0;35m\x1b[0;33myellow\x1b[0m\x1b[0;31m\x1b[0;35mgenta\x1b[0m (esc)
 
 pad() should interact well with color codes (issue5416)
 
   $ hg debugtemplate --color=always \
   > '{pad(label(red, "red"), 5, label(cyan, "-"))}\n'
   \x1b[0;31mred\x1b[0m\x1b[0;36m-\x1b[0m\x1b[0;36m-\x1b[0m (esc)
 
 pad() with truncate has to strip color codes, though
 
   $ hg debugtemplate --color=always \
   > '{pad(label(red, "scarlet"), 5, truncate=true)}\n'
   scarl
 
 label should be no-op if color is disabled:
 
   $ hg log --color=never -l 1 --template '{label(red, "text\n")}'
   text
   $ hg log --config extensions.color=! -l 1 --template '{label(red, "text\n")}'
   text
 
 Test branches inside if statement:
 
   $ hg log -r 0 --template '{if(branches, "yes", "no")}\n'
   no
 
 Test dict constructor:
 
   $ hg log -r 0 -T '{dict(y=node|short, x=rev)}\n'
   y=f7769ec2ab97 x=0
   $ hg log -r 0 -T '{dict(x=rev, y=node|short) % "{key}={value}\n"}'
   x=0
   y=f7769ec2ab97
   $ hg log -r 0 -T '{dict(x=rev, y=node|short)|json}\n'
   {"x": 0, "y": "f7769ec2ab97"}
   $ hg log -r 0 -T '{dict()|json}\n'
   {}
 
   $ hg log -r 0 -T '{dict(rev, node=node|short)}\n'
   rev=0 node=f7769ec2ab97
   $ hg log -r 0 -T '{dict(rev, node|short)}\n'
   rev=0 node=f7769ec2ab97
 
   $ hg log -r 0 -T '{dict(rev, rev=rev)}\n'
   hg: parse error: duplicated dict key 'rev' inferred
   [10]
   $ hg log -r 0 -T '{dict(node, node|short)}\n'
   hg: parse error: duplicated dict key 'node' inferred
   [10]
   $ hg log -r 0 -T '{dict(1 + 2)}'
   hg: parse error: dict key cannot be inferred
   [10]
 
   $ hg log -r 0 -T '{dict(x=rev, x=node)}'
   hg: parse error: dict got multiple values for keyword argument 'x'
   [10]
 
 Test get function:
 
   $ hg log -r 0 --template '{get(extras, "branch")}\n'
   default
   $ hg log -r 0 --template '{get(extras, "br{"anch"}")}\n'
   default
   $ hg log -r 0 --template '{get(files, "should_fail")}\n'
   hg: parse error: not a dictionary
   (get() expects a dict as first argument)
   [10]
 
 Test json filter applied to wrapped object:
 
   $ hg log -r0 -T '{files|json}\n'
   ["a"]
   $ hg log -r0 -T '{extras|json}\n'
   {"branch": "default"}
   $ hg log -r0 -T '{date|json}\n'
   [0, 0]
   $ hg log -r0 -T '{revset(":")|json}\n'
   [0, 1]
 
 Test json filter applied to map result:
 
   $ hg log -r0 -T '{json(extras % "{key}")}\n'
   ["branch"]
 
 Test localdate(date, tz) function:
 
   $ TZ=JST-09 hg log -r0 -T '{date|localdate|isodate}\n'
   1970-01-01 09:00 +0900
   $ TZ=JST-09 hg log -r0 -T '{localdate(date, "UTC")|isodate}\n'
   1970-01-01 00:00 +0000
   $ TZ=JST-09 hg log -r0 -T '{localdate(date, "blahUTC")|isodate}\n'
   hg: parse error: localdate expects a timezone
   [10]
   $ TZ=JST-09 hg log -r0 -T '{localdate(date, "+0200")|isodate}\n'
   1970-01-01 02:00 +0200
   $ TZ=JST-09 hg log -r0 -T '{localdate(date, "0")|isodate}\n'
   1970-01-01 00:00 +0000
   $ TZ=JST-09 hg log -r0 -T '{localdate(date, 0)|isodate}\n'
   1970-01-01 00:00 +0000
   $ hg log -r0 -T '{localdate(date, "invalid")|isodate}\n'
   hg: parse error: localdate expects a timezone
   [10]
   $ hg log -r0 -T '{localdate(date, date)|isodate}\n'
   hg: parse error: localdate expects a timezone
   [10]
 
 Test shortest(node) function:
 
   $ echo b > b
   $ hg ci -qAm b
   $ hg log --template '{shortest(node)}\n'
   e777
   bcc7
   f776
   $ hg log --template '{shortest(node, 10)}\n'
   e777603221
   bcc7ff960b
   f7769ec2ab
   $ hg log --template '{shortest(node, 1)}\n' -r null
   00
   $ hg log --template '{node|shortest}\n' -l1
   e777
 
   $ hg log -r 0 -T '{shortest(node, "1{"0"}")}\n'
   f7769ec2ab
   $ hg log -r 0 -T '{shortest(node, "not an int")}\n'
   hg: parse error: shortest() expects an integer minlength
   [10]
 
   $ hg log -r 'wdir()' -T '{node|shortest}\n'
   ffff
 
   $ hg log --template '{shortest("f")}\n' -l1
   f
 
   $ hg log --template '{shortest("0123456789012345678901234567890123456789")}\n' -l1
   0123456789012345678901234567890123456789
 
   $ hg log --template '{shortest("01234567890123456789012345678901234567890123456789")}\n' -l1
   01234567890123456789012345678901234567890123456789
 
   $ hg log --template '{shortest("not a hex string")}\n' -l1
   not a hex string
 
   $ hg log --template '{shortest("not a hex string, but it'\''s 40 bytes long")}\n' -l1
   not a hex string, but it's 40 bytes long
 
   $ hg log --template '{shortest("ffffffffffffffffffffffffffffffffffffffff")}\n' -l1
   ffff
 
   $ hg log --template '{shortest("fffffff")}\n' -l1
   ffff
 
   $ hg log --template '{shortest("ff")}\n' -l1
   ffff
 
   $ cd ..
 
 Test shortest(node) with the repo having short hash collision:
 
   $ hg init hashcollision
   $ cd hashcollision
   $ cat <<EOF >> .hg/hgrc
   > [experimental]
   > evolution.createmarkers=True
   > EOF
   $ echo 0 > a
   $ hg ci -qAm 0
   $ for i in 17 129 248 242 480 580 617 1057 2857 4025; do
   >   hg up -q 0
   >   echo $i > a
   >   hg ci -qm $i
   > done
   $ hg up -q null
   $ hg log -r0: -T '{rev}:{node}\n'
   0:b4e73ffab476aa0ee32ed81ca51e07169844bc6a
   1:11424df6dc1dd4ea255eae2b58eaca7831973bbc
   2:11407b3f1b9c3e76a79c1ec5373924df096f0499
   3:11dd92fe0f39dfdaacdaa5f3997edc533875cfc4
   4:10776689e627b465361ad5c296a20a487e153ca4
   5:a00be79088084cb3aff086ab799f8790e01a976b
   6:a0b0acd79b4498d0052993d35a6a748dd51d13e6
   7:a0457b3450b8e1b778f1163b31a435802987fe5d
   8:c56256a09cd28e5764f32e8e2810d0f01e2e357a
   9:c5623987d205cd6d9d8389bfc40fff9dbb670b48
   10:c562ddd9c94164376c20b86b0b4991636a3bf84f
   $ hg debugobsolete a00be79088084cb3aff086ab799f8790e01a976b
   1 new obsolescence markers
   obsoleted 1 changesets
   $ hg debugobsolete c5623987d205cd6d9d8389bfc40fff9dbb670b48
   1 new obsolescence markers
   obsoleted 1 changesets
   $ hg debugobsolete c562ddd9c94164376c20b86b0b4991636a3bf84f
   1 new obsolescence markers
   obsoleted 1 changesets
 
  nodes starting with '11' (we don't have the revision number '11' though)
 
   $ hg log -r 1:3 -T '{rev}:{shortest(node, 0)}\n'
   1:1142
   2:1140
   3:11d
 
  '5:a00' is hidden, but still we have two nodes starting with 'a0'
 
   $ hg log -r 6:7 -T '{rev}:{shortest(node, 0)}\n'
   6:a0b
   7:a04
 
  node '10' conflicts with the revision number '10' even if it is hidden
  (we could exclude hidden revision numbers, but currently we don't)
 
   $ hg log -r 4 -T '{rev}:{shortest(node, 0)}\n'
   4:107
   $ hg log -r 4 -T '{rev}:{shortest(node, 0)}\n' --hidden
   4:107
 
   $ hg --config experimental.revisions.prefixhexnode=yes log -r 4 -T '{rev}:{shortest(node, 0)}\n'
   4:x10
   $ hg --config experimental.revisions.prefixhexnode=yes log -r 4 -T '{rev}:{shortest(node, 0)}\n' --hidden
   4:x10
 
  node 'c562' should be unique if the other 'c562' nodes are hidden
  (but we don't try the slow path to filter out hidden nodes for now)
 
   $ hg log -r 8 -T '{rev}:{node|shortest}\n'
   8:c5625
   $ hg log -r 8:10 -T '{rev}:{node|shortest}\n' --hidden
   8:c5625
   9:c5623
   10:c562d
 
   $ cd ..
 
 Test prefixhexnode when the first character of the hash is 0.
   $ hg init hashcollision2
   $ cd hashcollision2
   $ cat <<EOF >> .hg/hgrc
   > [experimental]
   > evolution.createmarkers=True
   > EOF
   $ echo 0 > a
   $ hg ci -qAm 0
   $ echo 21 > a
   $ hg ci -qm 21
   $ hg up -q null
   $ hg log -r0: -T '{rev}:{node}\n'
   0:b4e73ffab476aa0ee32ed81ca51e07169844bc6a
   1:0cf177ba2b1dc3862a00fb81715fec90950201be
 
  we need the 'x' prefix to ensure we aren't colliding with rev0. We identify
  the collision with nullid if we aren't using disambiguatewithin, so we need to set
  that as well.
   $ hg --config experimental.revisions.disambiguatewithin='descendants(0)' \
   >    --config experimental.revisions.prefixhexnode=yes \
   >    log -r 1 -T '{rev}:{shortest(node, 0)}\n'
   1:x0
 
   $ hg debugobsolete 0cf177ba2b1dc3862a00fb81715fec90950201be
   1 new obsolescence markers
   obsoleted 1 changesets
   $ hg up -q 0
   $ echo 61 > a
   $ hg ci -m 61
   $ hg log -r0: -T '{rev}:{node}\n'
   0:b4e73ffab476aa0ee32ed81ca51e07169844bc6a
   2:01384dde84b3a511ae0835f35ac40bd806c99bb8
 
  we still have the 'x' prefix because '0' is still the shortest prefix, since
  rev1's '0c' is hidden.
   $ hg --config experimental.revisions.disambiguatewithin=0:-1-0 \
   >    --config experimental.revisions.prefixhexnode=yes \
   >    log -r 0:-1-0 -T '{rev}:{shortest(node, 0)}\n'
   2:x0
 
  we don't have the 'x' prefix on 2 because '01' is not a synonym for rev1.
   $ hg --config experimental.revisions.disambiguatewithin=0:-1-0 \
   >    --config experimental.revisions.prefixhexnode=yes \
   >    log -r 0:-1-0 -T '{rev}:{shortest(node, 0)}\n' --hidden
   1:0c
   2:01
 
   $ cd ..
 
 Test pad function
 
   $ cd r
 
   $ hg log --template '{pad(rev, 20)} {author|user}\n'
   2                    test
   1                    {node|short}
   0                    test
 
   $ hg log --template '{pad(rev, 20, " ", True)} {author|user}\n'
                      2 test
                      1 {node|short}
                      0 test
 
   $ hg log --template '{pad(rev, 20, "-", False)} {author|user}\n'
   2------------------- test
   1------------------- {node|short}
   0------------------- test
 
   $ hg log --template '{pad(author, 5, "-", False, True)}\n'
   test-
   {node
   test-
   $ hg log --template '{pad(author, 5, "-", True, True)}\n'
   -test
   hort}
   -test
 
 Test template string in pad function
 
   $ hg log -r 0 -T '{pad("\{{rev}}", 10)} {author|user}\n'
   {0}        test
 
   $ hg log -r 0 -T '{pad(r"\{rev}", 10)} {author|user}\n'
   \{rev}     test
 
 Test width argument passed to pad function
 
   $ hg log -r 0 -T '{pad(rev, "1{"0"}")} {author|user}\n'
   0          test
   $ hg log -r 0 -T '{pad(rev, "not an int")}\n'
   hg: parse error: pad() expects an integer width
   [10]
 
 Test invalid fillchar passed to pad function
 
   $ hg log -r 0 -T '{pad(rev, 10, "")}\n'
   hg: parse error: pad() expects a single fill character
   [10]
   $ hg log -r 0 -T '{pad(rev, 10, "--")}\n'
   hg: parse error: pad() expects a single fill character
   [10]
 
 Test boolean argument passed to pad function
 
  no crash
 
   $ hg log -r 0 -T '{pad(rev, 10, "-", "f{"oo"}")}\n'
   ---------0
 
  string/literal
 
   $ hg log -r 0 -T '{pad(rev, 10, "-", "false")}\n'
   ---------0
   $ hg log -r 0 -T '{pad(rev, 10, "-", false)}\n'
   0---------
   $ hg log -r 0 -T '{pad(rev, 10, "-", "")}\n'
   0---------
 
  unknown keyword is evaluated to ''
 
   $ hg log -r 0 -T '{pad(rev, 10, "-", unknownkeyword)}\n'
   0---------
 
 Test separate function
 
   $ hg log -r 0 -T '{separate("-", "", "a", "b", "", "", "c", "")}\n'
   a-b-c
   $ hg log -r 0 -T '{separate(" ", "{rev}:{node|short}", author|user, branch)}\n'
   0:f7769ec2ab97 test default
   $ hg log -r 0 --color=always -T '{separate(" ", "a", label(red, "b"), "c", label(red, ""), "d")}\n'
   a \x1b[0;31mb\x1b[0m c d (esc)
 
 Test boolean expression/literal passed to if function
 
   $ hg log -r 0 -T '{if(rev, "rev 0 is True")}\n'
   rev 0 is True
   $ hg log -r 0 -T '{if(0, "literal 0 is True as well")}\n'
   literal 0 is True as well
   $ hg log -r 0 -T '{if(min(revset(r"0")), "0 of hybriditem is also True")}\n'
   0 of hybriditem is also True
   $ hg log -r 0 -T '{if("", "", "empty string is False")}\n'
   empty string is False
   $ hg log -r 0 -T '{if(revset(r"0 - 0"), "", "empty list is False")}\n'
   empty list is False
   $ hg log -r 0 -T '{if(revset(r"0"), "non-empty list is True")}\n'
   non-empty list is True
   $ hg log -r 0 -T '{if(revset(r"0") % "", "list of empty strings is True")}\n'
   list of empty strings is True
   $ hg log -r 0 -T '{if(true, "true is True")}\n'
   true is True
   $ hg log -r 0 -T '{if(false, "", "false is False")}\n'
   false is False
   $ hg log -r 0 -T '{if("false", "non-empty string is True")}\n'
   non-empty string is True
 
 Test ifcontains function
 
   $ hg log --template '{rev} {ifcontains(rev, "2 two 0", "is in the string", "is not")}\n'
   2 is in the string
   1 is not
   0 is in the string
 
   $ hg log -T '{rev} {ifcontains(rev, "2 two{" 0"}", "is in the string", "is not")}\n'
   2 is in the string
   1 is not
   0 is in the string
 
   $ hg log --template '{rev} {ifcontains("a", file_adds, "added a", "did not add a")}\n'
   2 did not add a
   1 did not add a
   0 added a
 
   $ hg log --debug -T '{rev}{ifcontains(1, parents, " is parent of 1")}\n'
   2 is parent of 1
   1
   0
 
   $ hg log -l1 -T '{ifcontains("branch", extras, "t", "f")}\n'
   t
   $ hg log -l1 -T '{ifcontains("branch", extras % "{key}", "t", "f")}\n'
   t
   $ hg log -l1 -T '{ifcontains("branc", extras % "{key}", "t", "f")}\n'
   f
   $ hg log -l1 -T '{ifcontains("branc", stringify(extras % "{key}"), "t", "f")}\n'
   t
 
 Test revset function
 
   $ hg log --template '{rev} {ifcontains(rev, revset("."), "current rev", "not current rev")}\n'
   2 current rev
   1 not current rev
   0 not current rev
 
   $ hg log --template '{rev} {ifcontains(rev, revset(". + .^"), "match rev", "not match rev")}\n'
   2 match rev
   1 match rev
   0 not match rev
 
   $ hg log -T '{ifcontains(desc, revset(":"), "", "type not match")}\n' -l1
   type not match
 
   $ hg log --template '{rev} Parents: {revset("parents(%s)", rev)}\n'
   2 Parents: 1
   1 Parents: 0
   0 Parents: 
 
   $ cat >> .hg/hgrc <<EOF
   > [revsetalias]
   > myparents(\$1) = parents(\$1)
   > EOF
   $ hg log --template '{rev} Parents: {revset("myparents(%s)", rev)}\n'
   2 Parents: 1
   1 Parents: 0
   0 Parents: 
 
   $ hg log --template 'Rev: {rev}\n{revset("::%s", rev) % "Ancestor: {revision}\n"}\n'
   Rev: 2
   Ancestor: 0
   Ancestor: 1
   Ancestor: 2
   
   Rev: 1
   Ancestor: 0
   Ancestor: 1
   
   Rev: 0
   Ancestor: 0
   
   $ hg log --template '{revset("TIP"|lower)}\n' -l1
   2
 
   $ hg log -T '{revset("%s", "t{"ip"}")}\n' -l1
   2
 
  a list template is evaluated for each item of revset/parents
 
   $ hg log -T '{rev} p: {revset("p1(%s)", rev) % "{rev}:{node|short}"}\n'
   2 p: 1:bcc7ff960b8e
   1 p: 0:f7769ec2ab97
   0 p: 
 
   $ hg log --debug -T '{rev} p:{parents % " {rev}:{node|short}"}\n'
   2 p: 1:bcc7ff960b8e -1:000000000000
   1 p: 0:f7769ec2ab97 -1:000000000000
   0 p: -1:000000000000 -1:000000000000
 
  therefore, 'revcache' should be recreated for each rev
 
   $ hg log -T '{rev} {file_adds}\np {revset("p1(%s)", rev) % "{file_adds}"}\n'
   2 aa b
   p 
   1 
   p a
   0 a
   p 
 
   $ hg log --debug -T '{rev} {file_adds}\np {parents % "{file_adds}"}\n'
   2 aa b
   p 
   1 
   p a
   0 a
   p 
 
 a revset item must be evaluated as an integer revision, not an offset from tip
 
   $ hg log -l 1 -T '{revset("null") % "{rev}:{node|short}"}\n'
   -1:000000000000
   $ hg log -l 1 -T '{revset("%s", "null") % "{rev}:{node|short}"}\n'
   -1:000000000000
 
 join() should pick '{rev}' from revset items:
 
   $ hg log -R ../a -T '{join(revset("parents(%d)", rev), ", ")}\n' -r6
   4, 5
 
 on the other hand, parents are formatted as '{rev}:{node|formatnode}' by
 default. join() should agree with the default formatting:
 
   $ hg log -R ../a -T '{join(parents, ", ")}\n' -r6
   5:13207e5a10d9, 4:bbe44766e73d
 
   $ hg log -R ../a -T '{join(parents, ",\n")}\n' -r6 --debug
   5:13207e5a10d9fd28ec424934298e176197f2c67f,
   4:bbe44766e73d5f11ed2177f1838de10c53ef3e74
 
 for historical reasons, revset() supports old-style list template
 
   $ hg log -T '{revset(":")}\n' -l1 \
   >        --config templates.start_revisions='"["' \
   >        --config templates.end_revisions='"]"' \
   >        --config templates.revision='"{revision}, "' \
   >        --config templates.last_revision='"{revision}"'
   [0, 1, 2]
   $ hg log -T '{revset(":") % " {revision}"}\n' -l1
    0 1 2
 
 but a filtered one doesn't
 
   $ hg log -T '{filter(revset(":"), ifeq(rev, 1, "", "y"))}\n' -l1 \
   >        --config templates.start_revisions='"["' \
   >        --config templates.end_revisions='"]"' \
   >        --config templates.revision='"{revision}, "' \
   >        --config templates.last_revision='"{revision}"'
   0 2
   $ hg log -T '{filter(revset(":"), ifeq(rev, 1, "", "y")) % "x{revision}"}\n' -l1
   xx
 
 %d parameter handling:
 
   $ hg log -T '{revset("%d", rev)}\n' -r'wdir()'
   2147483647
   $ hg log -T '{revset("%d", rev)}\n' -r'null'
   -1
   $ hg log -T '{revset("%d", rev + 1)}\n' -r'tip'
   abort: unknown revision '3'
   [10]
   $ hg log -T '{revset("%d", rev - 1)}\n' -r'null'
   abort: unknown revision '-2'
   [10]
 
 Invalid arguments passed to revset()
 
   $ hg log -T '{revset("%whatever", 0)}\n'
   hg: parse error: unexpected revspec format character w
   [10]
   $ hg log -T '{revset("%lwhatever", files)}\n'
   hg: parse error: unexpected revspec format character w
   [10]
   $ hg log -T '{revset("%s %s", 0)}\n'
   hg: parse error: missing argument for revspec
   [10]
   $ hg log -T '{revset("", 0)}\n'
   hg: parse error: too many revspec arguments specified
   [10]
   $ hg log -T '{revset("%s", 0, 1)}\n'
   hg: parse error: too many revspec arguments specified
   [10]
   $ hg log -T '{revset("%", 0)}\n'
   hg: parse error: incomplete revspec format character
   [10]
   $ hg log -T '{revset("%l", 0)}\n'
   hg: parse error: incomplete revspec format character
   [10]
   $ hg log -T '{revset("%d", 'foo')}\n'
   hg: parse error: invalid argument for revspec
   [10]
   $ hg log -T '{revset("%ld", files)}\n'
   hg: parse error: invalid argument for revspec
   [10]
   $ hg log -T '{revset("%ls", 0)}\n'
   hg: parse error: invalid argument for revspec
   [10]
   $ hg log -T '{revset("%b", 'foo')}\n'
   hg: parse error: invalid argument for revspec
   [10]
   $ hg log -T '{revset("%lb", files)}\n'
   hg: parse error: invalid argument for revspec
   [10]
   $ hg log -T '{revset("%r", 0)}\n'
   hg: parse error: invalid argument for revspec
   [10]
 
 Invalid operation on revset()
 
   $ hg log -T '{get(revset(":"), "foo")}\n'
   hg: parse error: not a dictionary
   (get() expects a dict as first argument)
   [10]
 
 Test files function
 
   $ hg log -T "{rev}\n{join(files('*'), '\n')}\n"
   2
   a
   aa
   b
   1
   a
   0
   a
 
   $ hg log -T "{rev}\n{join(files('aa'), '\n')}\n"
   2
   aa
   1
   
   0
   
 
   $ hg log -l1 -T "{files('aa') % '{file}\n'}"
   aa
   $ hg log -l1 -T "{files('aa') % '{path}\n'}"
   aa
 
   $ hg rm a
   $ hg log -r "wdir()" -T "{rev}\n{join(files('*'), '\n')}\n"
   2147483647
   aa
   b
   $ hg revert a
 
 Test relpath function
 
   $ hg log -r0 -T '{files % "{file|relpath}\n"}'
   a
   $ cd ..
   $ hg log -R r -r0 -T '{files % "{file|relpath}\n"}'
   r/a
 
 Test stringify on sub expressions
 
   $ hg log -R a -r 8 --template '{join(files, if("1", if("1", ", ")))}\n'
   fourth, second, third
   $ hg log -R a -r 8 --template '{strip(if("1", if("1", "-abc-")), if("1", if("1", "-")))}\n'
   abc
 
 Test splitlines
 
   $ hg log -Gv -R a --template "{splitlines(desc) % 'foo {line}\n'}"
   @  foo Modify, add, remove, rename
   |
   o  foo future
   |
   o  foo third
   |
   o  foo second
   
   o    foo merge
   |\
   | o  foo new head
   | |
   o |  foo new branch
   |/
   o  foo no user, no domain
   |
   o  foo no person
   |
   o  foo other 1
   |  foo other 2
   |  foo
   |  foo other 3
   o  foo line 1
      foo line 2
 
   $ hg log -R a -r0 -T '{desc|splitlines}\n'
   line 1 line 2
   $ hg log -R a -r0 -T '{join(desc|splitlines, "|")}\n'
   line 1|line 2
 
 Test startswith
   $ hg log -Gv -R a --template "{startswith(desc)}"
   hg: parse error: startswith expects two arguments
   [10]
 
   $ hg log -Gv -R a --template "{startswith('line', desc)}"
   @
   |
   o
   |
   o
   |
   o
   
   o
   |\
   | o
   | |
   o |
   |/
   o
   |
   o
   |
   o
   |
   o  line 1
      line 2
 
 Test word function (including index out of bounds graceful failure)
 
   $ hg log -Gv -R a --template "{word('1', desc)}"
   @  add,
   |
   o
   |
   o
   |
   o
   
   o
   |\
   | o  head
   | |
   o |  branch
   |/
   o  user,
   |
   o  person
   |
   o  1
   |
   o  1
   
 
 Test word third parameter used as splitter
 
   $ hg log -Gv -R a --template "{word('0', desc, 'o')}"
   @  M
   |
   o  future
   |
   o  third
   |
   o  sec
   
   o    merge
   |\
   | o  new head
   | |
   o |  new branch
   |/
   o  n
   |
   o  n
   |
   o
   |
   o  line 1
      line 2
 
 Test word error messages for not enough and too many arguments
 
   $ hg log -Gv -R a --template "{word('0')}"
   hg: parse error: word expects two or three arguments, got 1
   [10]
 
   $ hg log -Gv -R a --template "{word('0', desc, 'o', 'h', 'b', 'o', 'y')}"
   hg: parse error: word expects two or three arguments, got 7
   [10]
 
 Test word for integer literal
 
   $ hg log -R a --template "{word(2, desc)}\n" -r0
   line
 
 Test word for invalid numbers
 
   $ hg log -Gv -R a --template "{word('a', desc)}"
   hg: parse error: word expects an integer index
   [10]
 
 Test word for out of range
 
   $ hg log -R a --template "{word(10000, desc)}"
   $ hg log -R a --template "{word(-10000, desc)}"
 
 Test indent and not adding to empty lines
 
   $ hg log -T "-----\n{indent(desc, '>> ', ' > ')}\n" -r 0:1 -R a
   -----
    > line 1
   >> line 2
   -----
    > other 1
   >> other 2
   
   >> other 3
 
 Test indent with empty first line
 
   $ hg version -T "{indent('', '>> ')}\n"
   
 
   $ hg version -T "{indent('
   > second', '>> ')}\n"
   
   >> second
 
   $ hg version -T "{indent('
   > second', '>> ', ' > ')}\n"
   
   >> second
 
 Test with non-strings like dates
 
   $ hg log -T "{indent(date, '   ')}\n" -r 2:3 -R a
      1200000.00
      1300000.00
 
 Test cbor filter:
 
   $ cat <<'EOF' > "$TESTTMP/decodecbor.py"
   > from mercurial import (
   >     dispatch,
   > )
   > from mercurial.utils import (
   >     cborutil,
   >     procutil,
   >     stringutil,
   > )
   > dispatch.initstdio()
   > items = cborutil.decodeall(procutil.stdin.read())
   > procutil.stdout.write(stringutil.pprint(items, indent=1) + b'\n')
   > EOF
 
   $ hg log -T "{rev|cbor}" -R a -l2 | "$PYTHON" "$TESTTMP/decodecbor.py"
   [
    10,
    9
   ]
 
   $ hg log -T "{extras|cbor}" -R a -l1 | "$PYTHON" "$TESTTMP/decodecbor.py"
   [
    {
     'branch': 'default'
    }
   ]
 
   $ hg log -T "{revset(':')|cbor}" -R a -l1 | "$PYTHON" "$TESTTMP/decodecbor.py"
   [
    [
     0,
     1,
     2,
     3,
     4,
     5,
     6,
     7,
     8,
     9,
     10
    ]
   ]
 
   $ hg log -T "{dict(foo=revset('.'))|cbor}" -R a -l1 | "$PYTHON" "$TESTTMP/decodecbor.py"
   [
    {
     'foo': [
      10
     ]
    }
   ]
 
 json filter should escape HTML tags so that the output can be embedded in hgweb:
 
   $ hg log -T "{'<[e-mail]>'|json}\n" -R a -l1
   "\[e-mail]\u003e"
 
 Set up repository for non-ascii encoding tests:
 
   $ hg init nonascii
   $ cd nonascii
   $ "$PYTHON" <<EOF
   > open('latin1', 'wb').write(b'\xe9')
   > open('utf-8', 'wb').write(b'\xc3\xa9')
   > EOF
   $ HGENCODING=utf-8 hg branch -q `cat utf-8`
   $ HGENCODING=utf-8 hg ci -qAm "non-ascii branch: `cat utf-8`" utf-8
 
 json filter should try round-trip conversion to utf-8:
 
   $ HGENCODING=ascii hg log -T "{branch|json}\n" -r0
   "\u00e9"
   $ HGENCODING=ascii hg log -T "{desc|json}\n" -r0
   "non-ascii branch: \u00e9"
 
 json filter should take input as utf-8 if it was converted from utf-8:
 
   $ HGENCODING=latin-1 hg log -T "{branch|json}\n" -r0
   "\u00e9"
   $ HGENCODING=latin-1 hg log -T "{desc|json}\n" -r0
   "non-ascii branch: \u00e9"
 
 json filter takes input as utf-8b:
 
   $ HGENCODING=ascii hg log -T "{'`cat utf-8`'|json}\n" -l1
   "\u00e9"
   $ HGENCODING=ascii hg log -T "{'`cat latin1`'|json}\n" -l1
   "\udce9"
 
 cbor filter is bytes transparent, which should handle bytes subtypes
 as bytes:
 
   $ HGENCODING=ascii hg log -T "{branch|cbor}" -r0 \
   > | "$PYTHON" "$TESTTMP/decodecbor.py"
   [
    '?'
   ]
   $ HGENCODING=latin-1 hg log -T "{branch|cbor}" -r0 \
   > | "$PYTHON" "$TESTTMP/decodecbor.py"
   [
    '\xe9'
   ]
 
 utf8 filter:
 
   $ HGENCODING=ascii hg log -T "round-trip: {branch|utf8|hex}\n" -r0
   round-trip: c3a9
   $ HGENCODING=latin1 hg log -T "decoded: {'`cat latin1`'|utf8|hex}\n" -l1
   decoded: c3a9
   $ HGENCODING=ascii hg log -T "replaced: {'`cat latin1`'|utf8|hex}\n" -l1
   abort: decoding near * (glob)
   [255]
   $ hg log -T "coerced to string: {rev|utf8}\n" -r0
   coerced to string: 0
 
 pad width:
 
   $ HGENCODING=utf-8 hg debugtemplate "{pad('`cat utf-8`', 2, '-')}\n"
   \xc3\xa9- (esc)
 
 read config options:
 
   $ hg log -T "{config('templateconfig', 'knob', 'foo')}\n"
   foo
   $ hg log -T "{config('templateconfig', 'knob', 'foo')}\n" \
   > --config templateconfig.knob=bar
   bar
   $ hg log -T "{configbool('templateconfig', 'knob', True)}\n"
   True
   $ hg log -T "{configbool('templateconfig', 'knob', True)}\n" \
   > --config templateconfig.knob=0
   False
   $ hg log -T "{configint('templateconfig', 'knob', 123)}\n"
   123
   $ hg log -T "{configint('templateconfig', 'knob', 123)}\n" \
   > --config templateconfig.knob=456
   456
   $ hg log -T "{config('templateconfig', 'knob')}\n"
   devel-warn: config item requires an explicit default value: 'templateconfig.knob' at: * (glob)
   
   $ hg log -T "{configbool('ui', 'interactive')}\n"
   False
   $ hg log -T "{configbool('ui', 'interactive')}\n" --config ui.interactive=1
   True
   $ hg log -T "{config('templateconfig', 'knob', if(true, 'foo', 'bar'))}\n"
   foo
 
+reverse filter:
+
+  $ hg log -T "{'abc\ndef\nghi'|splitlines|reverse}\n"
+  ghi def abc
+
+  $ hg log -T "{'abc'|reverse}\n"
+  hg: parse error: not reversible
+  (incompatible use of template filter 'reverse')
+  [10]
+
+  $ hg log -T "{date|reverse}\n"
+  hg: parse error: not reversible
+  (template filter 'reverse' is not compatible with keyword 'date')
+  [10]
+
   $ cd ..