revset: make negate work for sort specs

mercurial/revset.py

@@ -1,571 +1,569 b''
 # revset.py - revision set queries for mercurial
 #
 # Copyright 2010 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 re
 import parser, util, error, discovery
 import match as _match
 from i18n import _
 
 elements = {
     "(": (20, ("group", 1, ")"), ("func", 1, ")")),
     "-": (19, ("negate", 19), ("minus", 19)),
     "::": (17, ("dagrangepre", 17), ("dagrange", 17),
            ("dagrangepost", 17)),
     "..": (17, ("dagrangepre", 17), ("dagrange", 17),
            ("dagrangepost", 17)),
     ":": (15, ("rangepre", 15), ("range", 15), ("rangepost", 15)),
     "not": (10, ("not", 10)),
     "!": (10, ("not", 10)),
     "and": (5, None, ("and", 5)),
     "&": (5, None, ("and", 5)),
     "or": (4, None, ("or", 4)),
     "|": (4, None, ("or", 4)),
     "+": (4, None, ("or", 4)),
     ",": (2, None, ("list", 2)),
     ")": (0, None, None),
     "symbol": (0, ("symbol",), None),
     "string": (0, ("string",), None),
     "end": (0, None, None),
 }
 
 keywords = set(['and', 'or', 'not'])
 
 def tokenize(program):
     pos, l = 0, len(program)
     while pos < l:
         c = program[pos]
         if c.isspace(): # skip inter-token whitespace
             pass
         elif c == ':' and program[pos:pos + 2] == '::': # look ahead carefully
             yield ('::', None, pos)
             pos += 1 # skip ahead
         elif c == '.' and program[pos:pos + 2] == '..': # look ahead carefully
             yield ('..', None, pos)
             pos += 1 # skip ahead
         elif c in "():,-|&+!": # handle simple operators
             yield (c, None, pos)
         elif c in '"\'': # handle quoted strings
             pos += 1
             s = pos
             while pos < l: # find closing quote
                 d = program[pos]
                 if d == '\\': # skip over escaped characters
                     pos += 2
                     continue
                 if d == c:
                     yield ('string', program[s:pos].decode('string-escape'), s)
                     break
                 pos += 1
             else:
                 raise error.ParseError(_("unterminated string"), s)
         elif c.isalnum() or c in '._' or ord(c) > 127: # gather up a symbol/keyword
             s = pos
             pos += 1
             while pos < l: # find end of symbol
                 d = program[pos]
                 if not (d.isalnum() or d in "._" or ord(d) > 127):
                     break
                 if d == '.' and program[pos - 1] == '.': # special case for ..
                     pos -= 1
                     break
                 pos += 1
             sym = program[s:pos]
             if sym in keywords: # operator keywords
                 yield (sym, None, s)
             else:
                 yield ('symbol', sym, s)
             pos -= 1
         else:
             raise error.ParseError(_("syntax error"), pos)
         pos += 1
     yield ('end', None, pos)
 
 # helpers
 
 def getstring(x, err):
     if x and (x[0] == 'string' or x[0] == 'symbol'):
         return x[1]
     raise error.ParseError(err)
 
 def getlist(x):
     if not x:
         return []
     if x[0] == 'list':
         return getlist(x[1]) + [x[2]]
     return [x]
 
 def getargs(x, min, max, err):
     l = getlist(x)
     if len(l) < min or len(l) > max:
         raise error.ParseError(err)
     return l
 
 def getset(repo, subset, x):
     if not x:
         raise error.ParseError(_("missing argument"))
     return methods[x[0]](repo, subset, *x[1:])
 
 # operator methods
 
-def negate(repo, subset, x):
-    return getset(repo, subset,
-                  ('string', '-' + getstring(x, _("can't negate that"))))
-
 def stringset(repo, subset, x):
     x = repo[x].rev()
     if x == -1 and len(subset) == len(repo):
         return [-1]
     if x in subset:
         return [x]
     return []
 
 def symbolset(repo, subset, x):
     if x in symbols:
         raise error.ParseError(_("can't use %s here") % x)
     return stringset(repo, subset, x)
 
 def rangeset(repo, subset, x, y):
     m = getset(repo, subset, x)
     if not m:
         m = getset(repo, range(len(repo)), x)
 
     n = getset(repo, subset, y)
     if not n:
         n = getset(repo, range(len(repo)), y)
 
     if not m or not n:
         return []
     m, n = m[0], n[-1]
 
     if m < n:
         r = range(m, n + 1)
     else:
         r = range(m, n - 1, -1)
     s = set(subset)
     return [x for x in r if x in s]
 
 def andset(repo, subset, x, y):
     return getset(repo, getset(repo, subset, x), y)
 
 def orset(repo, subset, x, y):
     s = set(getset(repo, subset, x))
     s |= set(getset(repo, [r for r in subset if r not in s], y))
     return [r for r in subset if r in s]
 
 def notset(repo, subset, x):
     s = set(getset(repo, subset, x))
     return [r for r in subset if r not in s]
 
 def listset(repo, subset, a, b):
     raise error.ParseError(_("can't use a list in this context"))
 
 def func(repo, subset, a, b):
     if a[0] == 'symbol' and a[1] in symbols:
         return symbols[a[1]](repo, subset, b)
     raise error.ParseError(_("not a function: %s") % a[1])
 
 # functions
 
 def p1(repo, subset, x):
     ps = set()
     cl = repo.changelog
     for r in getset(repo, subset, x):
         ps.add(cl.parentrevs(r)[0])
     return [r for r in subset if r in ps]
 
 def p2(repo, subset, x):
     ps = set()
     cl = repo.changelog
     for r in getset(repo, subset, x):
         ps.add(cl.parentrevs(r)[1])
     return [r for r in subset if r in ps]
 
 def parents(repo, subset, x):
     ps = set()
     cl = repo.changelog
     for r in getset(repo, subset, x):
         ps.update(cl.parentrevs(r))
     return [r for r in subset if r in ps]
 
 def maxrev(repo, subset, x):
     s = getset(repo, subset, x)
     if s:
         m = max(s)
         if m in subset:
             return [m]
     return []
 
 def limit(repo, subset, x):
     l = getargs(x, 2, 2, _("limit wants two arguments"))
     try:
         lim = int(getstring(l[1], _("limit wants a number")))
     except ValueError:
         raise error.ParseError(_("limit expects a number"))
     return getset(repo, subset, l[0])[:lim]
 
 def children(repo, subset, x):
     cs = set()
     cl = repo.changelog
     s = set(getset(repo, subset, x))
     for r in xrange(0, len(repo)):
         for p in cl.parentrevs(r):
             if p in s:
                 cs.add(r)
     return [r for r in subset if r in cs]
 
 def branch(repo, subset, x):
     s = getset(repo, range(len(repo)), x)
     b = set()
     for r in s:
         b.add(repo[r].branch())
     s = set(s)
     return [r for r in subset if r in s or repo[r].branch() in b]
 
 def ancestor(repo, subset, x):
     l = getargs(x, 2, 2, _("ancestor wants two arguments"))
     a = getset(repo, subset, l[0])
     b = getset(repo, subset, l[1])
     if len(a) > 1 or len(b) > 1:
         raise error.ParseError(_("ancestor arguments must be single revisions"))
     return [repo[a[0]].ancestor(repo[b[0]]).rev()]
 
 def ancestors(repo, subset, x):
     args = getset(repo, range(len(repo)), x)
     if not args:
         return []
     s = set(repo.changelog.ancestors(*args)) | set(args)
     return [r for r in subset if r in s]
 
 def descendants(repo, subset, x):
     args = getset(repo, range(len(repo)), x)
     if not args:
         return []
     s = set(repo.changelog.descendants(*args)) | set(args)
     return [r for r in subset if r in s]
 
 def follow(repo, subset, x):
     getargs(x, 0, 0, _("follow takes no arguments"))
     p = repo['.'].rev()
     s = set(repo.changelog.ancestors(p)) | set([p])
     return [r for r in subset if r in s]
 
 def date(repo, subset, x):
     ds = getstring(x, _("date wants a string"))
     dm = util.matchdate(ds)
     return [r for r in subset if dm(repo[r].date()[0])]
 
 def keyword(repo, subset, x):
     kw = getstring(x, _("keyword wants a string")).lower()
     l = []
     for r in subset:
         c = repo[r]
         t = " ".join(c.files() + [c.user(), c.description()])
         if kw in t.lower():
             l.append(r)
     return l
 
 def grep(repo, subset, x):
     gr = re.compile(getstring(x, _("grep wants a string")))
     l = []
     for r in subset:
         c = repo[r]
         for e in c.files() + [c.user(), c.description()]:
             if gr.search(e):
                 l.append(r)
                 continue
     return l
 
 def author(repo, subset, x):
     n = getstring(x, _("author wants a string")).lower()
     return [r for r in subset if n in repo[r].user().lower()]
 
 def hasfile(repo, subset, x):
     pat = getstring(x, _("file wants a pattern"))
     m = _match.match(repo.root, repo.getcwd(), [pat])
     s = []
     for r in subset:
         for f in repo[r].files():
             if m(f):
                 s.append(r)
                 continue
     return s
 
 def contains(repo, subset, x):
     pat = getstring(x, _("contains wants a pattern"))
     m = _match.match(repo.root, repo.getcwd(), [pat])
     s = []
     if m.files() == [pat]:
         for r in subset:
             if pat in repo[r]:
                 s.append(r)
                 continue
     else:
         for r in subset:
             for f in repo[r].manifest():
                 if m(f):
                     s.append(r)
                     continue
     return s
 
 def checkstatus(repo, subset, pat, field):
     m = _match.match(repo.root, repo.getcwd(), [pat])
     s = []
     fast = (m.files() == [pat])
     for r in subset:
         c = repo[r]
         if fast:
             if pat not in c.files():
                 continue
         else:
             for f in c.files():
                 if m(f):
                     break
             else:
                 continue
         files = repo.status(c.p1().node(), c.node())[field]
         if fast:
             if pat in files:
                 s.append(r)
                 continue
         else:
             for f in files:
                 if m(f):
                     s.append(r)
                     continue
     return s
 
 def modifies(repo, subset, x):
     pat = getstring(x, _("modifies wants a pattern"))
     return checkstatus(repo, subset, pat, 0)
 
 def adds(repo, subset, x):
     pat = getstring(x, _("adds wants a pattern"))
     return checkstatus(repo, subset, pat, 1)
 
 def removes(repo, subset, x):
     pat = getstring(x, _("removes wants a pattern"))
     return checkstatus(repo, subset, pat, 2)
 
 def merge(repo, subset, x):
     getargs(x, 0, 0, _("merge takes no arguments"))
     cl = repo.changelog
     return [r for r in subset if cl.parentrevs(r)[1] != -1]
 
 def closed(repo, subset, x):
     getargs(x, 0, 0, _("closed takes no arguments"))
     return [r for r in subset if repo[r].extra().get('close')]
 
 def head(repo, subset, x):
     getargs(x, 0, 0, _("head takes no arguments"))
     hs = set()
     for b, ls in repo.branchmap().iteritems():
         hs.update(repo[h].rev() for h in ls)
     return [r for r in subset if r in hs]
 
 def reverse(repo, subset, x):
     l = getset(repo, subset, x)
     l.reverse()
     return l
 
 def sort(repo, subset, x):
     l = getargs(x, 1, 2, _("sort wants one or two arguments"))
     keys = "rev"
     if len(l) == 2:
         keys = getstring(l[1], _("sort spec must be a string"))
 
     s = l[0]
     keys = keys.split()
     l = []
     def invert(s):
         return "".join(chr(255 - ord(c)) for c in s)
     for r in getset(repo, subset, s):
         c = repo[r]
         e = []
         for k in keys:
             if k == 'rev':
                 e.append(r)
             elif k == '-rev':
                 e.append(-r)
             elif k == 'branch':
                 e.append(c.branch())
             elif k == '-branch':
                 e.append(invert(c.branch()))
             elif k == 'desc':
                 e.append(c.description())
             elif k == '-desc':
                 e.append(invert(c.description()))
             elif k in 'user author':
                 e.append(c.user())
             elif k in '-user -author':
                 e.append(invert(c.user()))
             elif k == 'date':
                 e.append(c.date()[0])
             elif k == '-date':
                 e.append(-c.date()[0])
             else:
                 raise error.ParseError(_("unknown sort key %r") % k)
         e.append(r)
         l.append(e)
     l.sort()
     return [e[-1] for e in l]
 
 def getall(repo, subset, x):
     getargs(x, 0, 0, _("all takes no arguments"))
     return subset
 
 def heads(repo, subset, x):
     s = getset(repo, subset, x)
     ps = set(parents(repo, subset, x))
     return [r for r in s if r not in ps]
 
 def roots(repo, subset, x):
     s = getset(repo, subset, x)
     cs = set(children(repo, subset, x))
     return [r for r in s if r not in cs]
 
 def outgoing(repo, subset, x):
     import hg # avoid start-up nasties
     l = getargs(x, 0, 1, _("outgoing wants a repository path"))
     dest = l[1:] or ''
     dest = repo.ui.expandpath(dest or 'default-push', dest or 'default')
     dest, branches = hg.parseurl(dest)
     other = hg.repository(hg.remoteui(repo, {}), dest)
     repo.ui.pushbuffer()
     o = discovery.findoutgoing(repo, other)
     repo.ui.popbuffer()
     cl = repo.changelog
     o = set([cl.rev(r) for r in repo.changelog.nodesbetween(o, None)[0]])
     return [r for r in subset if r in o]
 
 def tagged(repo, subset, x):
     getargs(x, 0, 0, _("tagged takes no arguments"))
     cl = repo.changelog
     s = set([cl.rev(n) for t, n in repo.tagslist() if t != 'tip'])
     return [r for r in subset if r in s]
 
 symbols = {
     "adds": adds,
     "all": getall,
     "ancestor": ancestor,
     "ancestors": ancestors,
     "author": author,
     "branch": branch,
     "children": children,
     "closed": closed,
     "contains": contains,
     "date": date,
     "descendants": descendants,
     "file": hasfile,
     "follow": follow,
     "grep": grep,
     "head": head,
     "heads": heads,
     "keyword": keyword,
     "limit": limit,
     "max": maxrev,
     "merge": merge,
     "modifies": modifies,
     "outgoing": outgoing,
     "p1": p1,
     "p2": p2,
     "parents": parents,
     "removes": removes,
     "reverse": reverse,
     "roots": roots,
     "sort": sort,
     "tagged": tagged,
     "user": author,
 }
 
 methods = {
-    "negate": negate,
     "range": rangeset,
     "string": stringset,
     "symbol": symbolset,
     "and": andset,
     "or": orset,
     "not": notset,
     "list": listset,
     "func": func,
 }
 
 def optimize(x, small):
     if x == None:
         return 0, x
 
     smallbonus = 1
     if small:
         smallbonus = .5
 
     op = x[0]
     if op == 'minus':
         return optimize(('and', x[1], ('not', x[2])), small)
     elif op == 'dagrange':
         return optimize(('and', ('func', ('symbol', 'descendants'), x[1]),
                          ('func', ('symbol', 'ancestors'), x[2])), small)
     elif op == 'dagrangepre':
         return optimize(('func', ('symbol', 'ancestors'), x[1]), small)
     elif op == 'dagrangepost':
         return optimize(('func', ('symbol', 'descendants'), x[1]), small)
     elif op == 'rangepre':
         return optimize(('range', ('string', '0'), x[1]), small)
     elif op == 'rangepost':
         return optimize(('range', x[1], ('string', 'tip')), small)
+    elif op == 'negate':
+        return optimize(('string',
+                         '-' + getstring(x[1], _("can't negate that"))), small)
     elif op in 'string symbol negate':
         return smallbonus, x # single revisions are small
     elif op == 'and' or op == 'dagrange':
         wa, ta = optimize(x[1], True)
         wb, tb = optimize(x[2], True)
         w = min(wa, wb)
         if wa > wb:
             return w, (op, tb, ta)
         return w, (op, ta, tb)
     elif op == 'or':
         wa, ta = optimize(x[1], False)
         wb, tb = optimize(x[2], False)
         if wb < wa:
             wb, wa = wa, wb
         return max(wa, wb), (op, ta, tb)
     elif op == 'not':
         o = optimize(x[1], not small)
         return o[0], (op, o[1])
     elif op == 'group':
         return optimize(x[1], small)
     elif op in 'range list':
         wa, ta = optimize(x[1], small)
         wb, tb = optimize(x[2], small)
         return wa + wb, (op, ta, tb)
     elif op == 'func':
         f = getstring(x[1], _("not a symbol"))
         wa, ta = optimize(x[2], small)
         if f in "grep date user author keyword branch file":
             w = 10 # slow
         elif f in "modifies adds removes outgoing":
             w = 30 # slower
         elif f == "contains":
             w = 100 # very slow
         elif f == "ancestor":
             w = 1 * smallbonus
         elif f == "reverse limit":
             w = 0
         elif f in "sort":
             w = 10 # assume most sorts look at changelog
         else:
             w = 1
         return w + wa, (op, x[1], ta)
     return 1, x
 
 parse = parser.parser(tokenize, elements).parse
 
 def match(spec):
     if not spec:
         raise error.ParseError(_("empty query"))
     tree = parse(spec)
     weight, tree = optimize(tree, True)
     def mfunc(repo, subset):
         return getset(repo, subset, tree)
     return mfunc

tests/test-revset

@@ -1,135 +1,136 b''
 #!/bin/sh
 
 HGENCODING=utf-8
 export HGENCODING
 
 try() {
 	echo '% hg debugrevspec' $@
 	hg debugrevspec --debug $@
 }
 
 log() {
     echo "% log '$1'"
     hg log --template '{rev}\n' -r "$1"
 }
 
 hg init repo
 cd repo
 
 echo a > a
 hg branch a
 hg ci -Aqm0
 
 echo b > b
 hg branch b
 hg ci -Aqm1
 
 rm a
 hg branch a-b-c-
 hg ci -Aqm2 -u Bob
 
 hg co 1
 hg branch +a+b+c+
 hg ci -Aqm3
 
 hg co 2  # interleave
 echo bb > b
 hg branch -- -a-b-c-
 hg ci -Aqm4 -d "May 12 2005"
 
 hg co 3
 hg branch /a/b/c/
 hg ci -Aqm"5 bug"
 
 hg merge 4
 hg branch _a_b_c_
 hg ci -Aqm"6 issue619"
 
 hg branch .a.b.c.
 hg ci -Aqm7
 
 hg branch all
 hg ci --close-branch -Aqm8
 
 hg co 4
 hg branch é
 hg ci -Aqm9
 
 hg tag -r6 1.0
 
 # names that should work without quoting
 try a
 try b-a
 try _a_b_c_
 try _a_b_c_-a
 try .a.b.c.
 try .a.b.c.-a
 try -- '-a-b-c-' # complains
 log -a-b-c- # succeeds with fallback
 try -- -a-b-c--a # complains
 try é
 
 # quoting needed
 try '"-a-b-c-"-a'
 
 log '1 or 2'
 log '1|2'
 log '1 and 2'
 log '1&2'
 try '1&2|3' # precedence - and is higher
 try '1|2&3' 
 try '1&2&3' # associativity
 try '1|(2|3)'
 log '1.0' # tag
 log 'a' # branch
 log '2785f51ee' 
 log 'date(2005)'
 log 'date(this is a test)'
 log 'date()'
 log 'date'
 log 'date(' 
 log 'date(tip)'
 log '"date"'
 log 'date(2005) and 1::'
 
 log 'ancestor(1)'
 log 'ancestor(4,5)'
 log 'ancestors(5)'
 log 'author(bob)'
 log 'branch(é)'
 log 'children(ancestor(4,5))'
 log 'closed()'
 log 'contains(a)'
 log 'descendants(2 or 3)'
 log 'file(b)'
 log 'follow()'
 log 'grep("issue\d+")'
 log 'head()'
 log 'heads(6::)'
 log 'keyword(issue)'
 log 'limit(head(), 1)'
 log 'max(contains(a))'
 log 'merge()'
 log 'modifies(b)'
 log 'p1(merge())'
 log 'p2(merge())'
 log 'parents(merge())'
 log 'removes(a)'
 log 'roots(all())'
 log 'reverse(2 or 3 or 4 or 5)'
 log 'sort(limit(reverse(all()), 3))'
 log 'sort(2 or 3 or 4 or 5, date)'
 log 'tagged()'
 log 'user(bob)'
 
 log '4::8'
 log '4:8'
 
 log 'sort(!merge() & (modifies(b) | user(bob) | keyword(bug) | keyword(issue) & 1::9), "-date")'
 
 log 'not 0 and 0:2'
 log 'not 1 and 0:2'
 log 'not 2 and 0:2'
 log '(1 and 2)::'
 log '(1 and 2):'
 log '(1 and 2):3'
+log 'sort(head(), -rev)'

tests/test-revset.out

@@ -1,212 +1,222 b''
 marked working directory as branch a
 marked working directory as branch b
 marked working directory as branch a-b-c-
 1 files updated, 0 files merged, 0 files removed, 0 files unresolved
 marked working directory as branch +a+b+c+
 0 files updated, 0 files merged, 1 files removed, 0 files unresolved
 marked working directory as branch -a-b-c-
 2 files updated, 0 files merged, 0 files removed, 0 files unresolved
 marked working directory as branch /a/b/c/
 1 files updated, 0 files merged, 1 files removed, 0 files unresolved
 (branch merge, don't forget to commit)
 marked working directory as branch _a_b_c_
 marked working directory as branch .a.b.c.
 marked working directory as branch all
 abort: can only close branch heads
 0 files updated, 0 files merged, 0 files removed, 0 files unresolved
 marked working directory as branch é
 % hg debugrevspec a
 ('symbol', 'a')
 0
 % hg debugrevspec b-a
 ('minus', ('symbol', 'b'), ('symbol', 'a'))
 1
 % hg debugrevspec _a_b_c_
 ('symbol', '_a_b_c_')
 6
 % hg debugrevspec _a_b_c_-a
 ('minus', ('symbol', '_a_b_c_'), ('symbol', 'a'))
 6
 % hg debugrevspec .a.b.c.
 ('symbol', '.a.b.c.')
 7
 % hg debugrevspec .a.b.c.-a
 ('minus', ('symbol', '.a.b.c.'), ('symbol', 'a'))
 7
 % hg debugrevspec -- -a-b-c-
 hg: parse error at 7: not a prefix: end
 % log '-a-b-c-'
 4
 % hg debugrevspec -- -a-b-c--a
 ('minus', ('minus', ('minus', ('negate', ('symbol', 'a')), ('symbol', 'b')), ('symbol', 'c')), ('negate', ('symbol', 'a')))
 abort: unknown revision '-a'!
 % hg debugrevspec é
 ('symbol', '\xc3\xa9')
 9
 % hg debugrevspec "-a-b-c-"-a
 ('minus', ('string', '-a-b-c-'), ('symbol', 'a'))
 4
 % log '1 or 2'
 1
 2
 % log '1|2'
 1
 2
 % log '1 and 2'
 % log '1&2'
 % hg debugrevspec 1&2|3
 ('or', ('and', ('symbol', '1'), ('symbol', '2')), ('symbol', '3'))
 3
 % hg debugrevspec 1|2&3
 ('or', ('symbol', '1'), ('and', ('symbol', '2'), ('symbol', '3')))
 1
 % hg debugrevspec 1&2&3
 ('and', ('and', ('symbol', '1'), ('symbol', '2')), ('symbol', '3'))
 % hg debugrevspec 1|(2|3)
 ('or', ('symbol', '1'), ('group', ('or', ('symbol', '2'), ('symbol', '3'))))
 1
 2
 3
 % log '1.0'
 6
 % log 'a'
 0
 % log '2785f51ee'
 0
 % log 'date(2005)'
 4
 % log 'date(this is a test)'
 hg: parse error at 10: unexpected token: symbol
 % log 'date()'
 hg: parse error: date wants a string
 % log 'date'
 hg: parse error: can't use date here
 % log 'date('
 hg: parse error at 5: not a prefix: end
 % log 'date(tip)'
 abort: invalid date: 'tip' 
 % log '"date"'
 abort: unknown revision 'date'!
 % log 'date(2005) and 1::'
 4
 % log 'ancestor(1)'
 hg: parse error: ancestor wants two arguments
 % log 'ancestor(4,5)'
 1
 % log 'ancestors(5)'
 0
 1
 3
 5
 % log 'author(bob)'
 2
 % log 'branch(é)'
 8
 9
 % log 'children(ancestor(4,5))'
 2
 3
 % log 'closed()'
 % log 'contains(a)'
 0
 1
 3
 5
 % log 'descendants(2 or 3)'
 2
 3
 4
 5
 6
 7
 8
 9
 % log 'file(b)'
 1
 4
 % log 'follow()'
 0
 1
 2
 4
 8
 9
 % log 'grep("issue\d+")'
 6
 % log 'head()'
 0
 1
 2
 3
 4
 5
 6
 7
 9
 % log 'heads(6::)'
 7
 % log 'keyword(issue)'
 6
 % log 'limit(head(), 1)'
 0
 % log 'max(contains(a))'
 5
 % log 'merge()'
 6
 % log 'modifies(b)'
 4
 % log 'p1(merge())'
 5
 % log 'p2(merge())'
 4
 % log 'parents(merge())'
 4
 5
 % log 'removes(a)'
 2
 6
 % log 'roots(all())'
 0
 % log 'reverse(2 or 3 or 4 or 5)'
 5
 4
 3
 2
 % log 'sort(limit(reverse(all()), 3))'
 7
 8
 9
 % log 'sort(2 or 3 or 4 or 5, date)'
 2
 3
 5
 4
 % log 'tagged()'
 6
 % log 'user(bob)'
 2
 % log '4::8'
 4
 8
 % log '4:8'
 4
 5
 6
 7
 8
 % log 'sort(!merge() & (modifies(b) | user(bob) | keyword(bug) | keyword(issue) & 1::9), "-date")'
 4
 2
 5
 % log 'not 0 and 0:2'
 1
 2
 % log 'not 1 and 0:2'
 0
 2
 % log 'not 2 and 0:2'
 0
 1
 % log '(1 and 2)::'
 % log '(1 and 2):'
 % log '(1 and 2):3'
+% log 'sort(head(), -rev)'
+9
+7
+6
+5
+4
+3
+2
+1
+0