tests/test-grep.t

rust: fix unsound `OwningDirstateMap`

As per the previous patch, `OwningDirstateMap` is unsound. Self-referential
structs are difficult to implement correctly in Rust since the compiler is
free to move structs around as much as it wants to. They are also very rarely
needed in practice, so the state-of-the-art on how they should be done within
the Rust rules is still a bit new.

The crate `ouroboros` is an attempt at providing a safe way (in the Rust sense)
of declaring self-referential structs. It is getting a lot attention and was
improved very quickly when soundness issues were found in the past: rather than
relying on our own (limited) review circle, we might as well use the de-facto
common crate to fix this problem. This will give us a much better chance of
finding issues should any new ones be discovered as well as the benefit of
fewer `unsafe` APIs of our own.

I was starting to think about how I would present a safe API to the old struct
but soon realized that the callback-based approach was already done in
`ouroboros`, along with a lot more care towards refusing incorrect structs.

In short: we don't return a mutable reference to the `DirstateMap` anymore, we
expect users of its API to pass a `FnOnce` that takes the map as an argument.
This allows our `OwningDirstateMap` to control the input and output lifetimes
of the code that modifies it to prevent such issues.

Changing to `ouroboros` meant changing every API with it, but it is relatively
low churn in the end. It correctly identified the example buggy modification of
`copy_map_insert` outlined in the previous patch as violating the borrow rules.

Differential Revision: https://phab.mercurial-scm.org/D12429

  $ hg init t
  $ cd t
  $ echo import > port
  $ hg add port
  $ hg commit -m 0 -u spam -d '0 0'
  $ echo export >> port
  $ hg commit -m 1 -u eggs -d '1 0'
  $ echo export > port
  $ echo vaportight >> port
  $ echo 'import/export' >> port
  $ hg commit -m 2 -u spam -d '2 0'
  $ echo 'import/export' >> port
  $ hg commit -m 3 -u eggs -d '3 0'
  $ head -n 3 port > port1
  $ mv port1 port
  $ hg commit -m 4 -u spam -d '4 0'

pattern error

  $ hg grep '**test**'
  grep: invalid match pattern: nothing to repeat* (glob)
  [1]

invalid revset syntax

  $ hg log -r 'diffcontains()'
  hg: parse error: diffcontains takes at least 1 argument
  [10]
  $ hg log -r 'diffcontains(:)'
  hg: parse error: diffcontains requires a string pattern
  [10]
  $ hg log -r 'diffcontains("re:**test**")'
  hg: parse error: invalid regular expression: nothing to repeat* (glob)
  [10]

simple

  $ hg grep -r tip:0 '.*'
  port:4:export
  port:4:vaportight
  port:4:import/export
  port:3:export
  port:3:vaportight
  port:3:import/export
  port:3:import/export
  port:2:export
  port:2:vaportight
  port:2:import/export
  port:1:import
  port:1:export
  port:0:import
  $ hg grep -r tip:0 port port
  port:4:export
  port:4:vaportight
  port:4:import/export
  port:3:export
  port:3:vaportight
  port:3:import/export
  port:3:import/export
  port:2:export
  port:2:vaportight
  port:2:import/export
  port:1:import
  port:1:export
  port:0:import

simple from subdirectory

  $ mkdir dir
  $ cd dir
  $ hg grep -r tip:0 port
  port:4:export
  port:4:vaportight
  port:4:import/export
  port:3:export
  port:3:vaportight
  port:3:import/export
  port:3:import/export
  port:2:export
  port:2:vaportight
  port:2:import/export
  port:1:import
  port:1:export
  port:0:import
  $ hg grep -r tip:0 port --config ui.relative-paths=yes
  ../port:4:export
  ../port:4:vaportight
  ../port:4:import/export
  ../port:3:export
  ../port:3:vaportight
  ../port:3:import/export
  ../port:3:import/export
  ../port:2:export
  ../port:2:vaportight
  ../port:2:import/export
  ../port:1:import
  ../port:1:export
  ../port:0:import
  $ cd ..

simple with color

  $ hg --config extensions.color= grep --config color.mode=ansi \
  >     --color=always port port -r tip:0
  \x1b[0;35mport\x1b[0m\x1b[0;36m:\x1b[0m\x1b[0;34m4\x1b[0m\x1b[0;36m:\x1b[0mex\x1b[0;31;1mport\x1b[0m (esc)
  \x1b[0;35mport\x1b[0m\x1b[0;36m:\x1b[0m\x1b[0;34m4\x1b[0m\x1b[0;36m:\x1b[0mva\x1b[0;31;1mport\x1b[0might (esc)
  \x1b[0;35mport\x1b[0m\x1b[0;36m:\x1b[0m\x1b[0;34m4\x1b[0m\x1b[0;36m:\x1b[0mim\x1b[0;31;1mport\x1b[0m/ex\x1b[0;31;1mport\x1b[0m (esc)
  \x1b[0;35mport\x1b[0m\x1b[0;36m:\x1b[0m\x1b[0;34m3\x1b[0m\x1b[0;36m:\x1b[0mex\x1b[0;31;1mport\x1b[0m (esc)
  \x1b[0;35mport\x1b[0m\x1b[0;36m:\x1b[0m\x1b[0;34m3\x1b[0m\x1b[0;36m:\x1b[0mva\x1b[0;31;1mport\x1b[0might (esc)
  \x1b[0;35mport\x1b[0m\x1b[0;36m:\x1b[0m\x1b[0;34m3\x1b[0m\x1b[0;36m:\x1b[0mim\x1b[0;31;1mport\x1b[0m/ex\x1b[0;31;1mport\x1b[0m (esc)
  \x1b[0;35mport\x1b[0m\x1b[0;36m:\x1b[0m\x1b[0;34m3\x1b[0m\x1b[0;36m:\x1b[0mim\x1b[0;31;1mport\x1b[0m/ex\x1b[0;31;1mport\x1b[0m (esc)
  \x1b[0;35mport\x1b[0m\x1b[0;36m:\x1b[0m\x1b[0;34m2\x1b[0m\x1b[0;36m:\x1b[0mex\x1b[0;31;1mport\x1b[0m (esc)
  \x1b[0;35mport\x1b[0m\x1b[0;36m:\x1b[0m\x1b[0;34m2\x1b[0m\x1b[0;36m:\x1b[0mva\x1b[0;31;1mport\x1b[0might (esc)
  \x1b[0;35mport\x1b[0m\x1b[0;36m:\x1b[0m\x1b[0;34m2\x1b[0m\x1b[0;36m:\x1b[0mim\x1b[0;31;1mport\x1b[0m/ex\x1b[0;31;1mport\x1b[0m (esc)
  \x1b[0;35mport\x1b[0m\x1b[0;36m:\x1b[0m\x1b[0;34m1\x1b[0m\x1b[0;36m:\x1b[0mim\x1b[0;31;1mport\x1b[0m (esc)
  \x1b[0;35mport\x1b[0m\x1b[0;36m:\x1b[0m\x1b[0;34m1\x1b[0m\x1b[0;36m:\x1b[0mex\x1b[0;31;1mport\x1b[0m (esc)
  \x1b[0;35mport\x1b[0m\x1b[0;36m:\x1b[0m\x1b[0;34m0\x1b[0m\x1b[0;36m:\x1b[0mim\x1b[0;31;1mport\x1b[0m (esc)

simple templated

  $ hg grep port -r tip:0 \
  > -T '{path}:{rev}:{node|short}:{texts % "{if(matched, text|upper, text)}"}\n'
  port:4:914fa752cdea:exPORT
  port:4:914fa752cdea:vaPORTight
  port:4:914fa752cdea:imPORT/exPORT
  port:3:95040cfd017d:exPORT
  port:3:95040cfd017d:vaPORTight
  port:3:95040cfd017d:imPORT/exPORT
  port:3:95040cfd017d:imPORT/exPORT
  port:2:3b325e3481a1:exPORT
  port:2:3b325e3481a1:vaPORTight
  port:2:3b325e3481a1:imPORT/exPORT
  port:1:8b20f75c1585:imPORT
  port:1:8b20f75c1585:exPORT
  port:0:f31323c92170:imPORT

  $ hg grep port -r tip:0 -T '{path}:{rev}:{texts}\n'
  port:4:export
  port:4:vaportight
  port:4:import/export
  port:3:export
  port:3:vaportight
  port:3:import/export
  port:3:import/export
  port:2:export
  port:2:vaportight
  port:2:import/export
  port:1:import
  port:1:export
  port:0:import

  $ hg grep port -r tip:0 -T '{path}:{tags}:{texts}\n'
  port:tip:export
  port:tip:vaportight
  port:tip:import/export
  port::export
  port::vaportight
  port::import/export
  port::import/export
  port::export
  port::vaportight
  port::import/export
  port::import
  port::export
  port::import

simple JSON (no "change" field)

  $ hg grep -r tip:0 -Tjson port
  [
   {
    "date": [4, 0],
    "lineno": 1,
    "node": "914fa752cdea87777ac1a8d5c858b0c736218f6c",
    "path": "port",
    "rev": 4,
    "texts": [{"matched": false, "text": "ex"}, {"matched": true, "text": "port"}],
    "user": "spam"
   },
   {
    "date": [4, 0],
    "lineno": 2,
    "node": "914fa752cdea87777ac1a8d5c858b0c736218f6c",
    "path": "port",
    "rev": 4,
    "texts": [{"matched": false, "text": "va"}, {"matched": true, "text": "port"}, {"matched": false, "text": "ight"}],
    "user": "spam"
   },
   {
    "date": [4, 0],
    "lineno": 3,
    "node": "914fa752cdea87777ac1a8d5c858b0c736218f6c",
    "path": "port",
    "rev": 4,
    "texts": [{"matched": false, "text": "im"}, {"matched": true, "text": "port"}, {"matched": false, "text": "/ex"}, {"matched": true, "text": "port"}],
    "user": "spam"
   },
   {
    "date": [3, 0],
    "lineno": 1,
    "node": "95040cfd017d658c536071c6290230a613c4c2a6",
    "path": "port",
    "rev": 3,
    "texts": [{"matched": false, "text": "ex"}, {"matched": true, "text": "port"}],
    "user": "eggs"
   },
   {
    "date": [3, 0],
    "lineno": 2,
    "node": "95040cfd017d658c536071c6290230a613c4c2a6",
    "path": "port",
    "rev": 3,
    "texts": [{"matched": false, "text": "va"}, {"matched": true, "text": "port"}, {"matched": false, "text": "ight"}],
    "user": "eggs"
   },
   {
    "date": [3, 0],
    "lineno": 3,
    "node": "95040cfd017d658c536071c6290230a613c4c2a6",
    "path": "port",
    "rev": 3,
    "texts": [{"matched": false, "text": "im"}, {"matched": true, "text": "port"}, {"matched": false, "text": "/ex"}, {"matched": true, "text": "port"}],
    "user": "eggs"
   },
   {
    "date": [3, 0],
    "lineno": 4,
    "node": "95040cfd017d658c536071c6290230a613c4c2a6",
    "path": "port",
    "rev": 3,
    "texts": [{"matched": false, "text": "im"}, {"matched": true, "text": "port"}, {"matched": false, "text": "/ex"}, {"matched": true, "text": "port"}],
    "user": "eggs"
   },
   {
    "date": [2, 0],
    "lineno": 1,
    "node": "3b325e3481a1f07435d81dfdbfa434d9a0245b47",
    "path": "port",
    "rev": 2,
    "texts": [{"matched": false, "text": "ex"}, {"matched": true, "text": "port"}],
    "user": "spam"
   },
   {
    "date": [2, 0],
    "lineno": 2,
    "node": "3b325e3481a1f07435d81dfdbfa434d9a0245b47",
    "path": "port",
    "rev": 2,
    "texts": [{"matched": false, "text": "va"}, {"matched": true, "text": "port"}, {"matched": false, "text": "ight"}],
    "user": "spam"
   },
   {
    "date": [2, 0],
    "lineno": 3,
    "node": "3b325e3481a1f07435d81dfdbfa434d9a0245b47",
    "path": "port",
    "rev": 2,
    "texts": [{"matched": false, "text": "im"}, {"matched": true, "text": "port"}, {"matched": false, "text": "/ex"}, {"matched": true, "text": "port"}],
    "user": "spam"
   },
   {
    "date": [1, 0],
    "lineno": 1,
    "node": "8b20f75c158513ff5ac80bd0e5219bfb6f0eb587",
    "path": "port",
    "rev": 1,
    "texts": [{"matched": false, "text": "im"}, {"matched": true, "text": "port"}],
    "user": "eggs"
   },
   {
    "date": [1, 0],
    "lineno": 2,
    "node": "8b20f75c158513ff5ac80bd0e5219bfb6f0eb587",
    "path": "port",
    "rev": 1,
    "texts": [{"matched": false, "text": "ex"}, {"matched": true, "text": "port"}],
    "user": "eggs"
   },
   {
    "date": [0, 0],
    "lineno": 1,
    "node": "f31323c9217050ba245ee8b537c713ec2e8ab226",
    "path": "port",
    "rev": 0,
    "texts": [{"matched": false, "text": "im"}, {"matched": true, "text": "port"}],
    "user": "spam"
   }
  ]

simple JSON without matching lines

  $ hg grep -r tip:0 -Tjson -l port
  [
   {
    "date": [4, 0],
    "lineno": 1,
    "node": "914fa752cdea87777ac1a8d5c858b0c736218f6c",
    "path": "port",
    "rev": 4,
    "user": "spam"
   },
   {
    "date": [3, 0],
    "lineno": 1,
    "node": "95040cfd017d658c536071c6290230a613c4c2a6",
    "path": "port",
    "rev": 3,
    "user": "eggs"
   },
   {
    "date": [2, 0],
    "lineno": 1,
    "node": "3b325e3481a1f07435d81dfdbfa434d9a0245b47",
    "path": "port",
    "rev": 2,
    "user": "spam"
   },
   {
    "date": [1, 0],
    "lineno": 1,
    "node": "8b20f75c158513ff5ac80bd0e5219bfb6f0eb587",
    "path": "port",
    "rev": 1,
    "user": "eggs"
   },
   {
    "date": [0, 0],
    "lineno": 1,
    "node": "f31323c9217050ba245ee8b537c713ec2e8ab226",
    "path": "port",
    "rev": 0,
    "user": "spam"
   }
  ]

diff of each revision for reference

  $ hg log -p -T'== rev: {rev} ==\n'
  == rev: 4 ==
  diff -r 95040cfd017d -r 914fa752cdea port
  --- a/port	Thu Jan 01 00:00:03 1970 +0000
  +++ b/port	Thu Jan 01 00:00:04 1970 +0000
  @@ -1,4 +1,3 @@
   export
   vaportight
   import/export
  -import/export
  
  == rev: 3 ==
  diff -r 3b325e3481a1 -r 95040cfd017d port
  --- a/port	Thu Jan 01 00:00:02 1970 +0000
  +++ b/port	Thu Jan 01 00:00:03 1970 +0000
  @@ -1,3 +1,4 @@
   export
   vaportight
   import/export
  +import/export
  
  == rev: 2 ==
  diff -r 8b20f75c1585 -r 3b325e3481a1 port
  --- a/port	Thu Jan 01 00:00:01 1970 +0000
  +++ b/port	Thu Jan 01 00:00:02 1970 +0000
  @@ -1,2 +1,3 @@
  -import
   export
  +vaportight
  +import/export
  
  == rev: 1 ==
  diff -r f31323c92170 -r 8b20f75c1585 port
  --- a/port	Thu Jan 01 00:00:00 1970 +0000
  +++ b/port	Thu Jan 01 00:00:01 1970 +0000
  @@ -1,1 +1,2 @@
   import
  +export
  
  == rev: 0 ==
  diff -r 000000000000 -r f31323c92170 port
  --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
  +++ b/port	Thu Jan 01 00:00:00 1970 +0000
  @@ -0,0 +1,1 @@
  +import
  

all

  $ hg grep --traceback --all -nu port port
  port:4:4:-:spam:import/export
  port:3:4:+:eggs:import/export
  port:2:1:-:spam:import
  port:2:2:+:spam:vaportight
  port:2:3:+:spam:import/export
  port:1:2:+:eggs:export
  port:0:1:+:spam:import

all JSON

  $ hg grep --all -Tjson port port
  [
   {
    "change": "-",
    "date": [4, 0],
    "lineno": 4,
    "node": "914fa752cdea87777ac1a8d5c858b0c736218f6c",
    "path": "port",
    "rev": 4,
    "texts": [{"matched": false, "text": "im"}, {"matched": true, "text": "port"}, {"matched": false, "text": "/ex"}, {"matched": true, "text": "port"}],
    "user": "spam"
   },
   {
    "change": "+",
    "date": [3, 0],
    "lineno": 4,
    "node": "95040cfd017d658c536071c6290230a613c4c2a6",
    "path": "port",
    "rev": 3,
    "texts": [{"matched": false, "text": "im"}, {"matched": true, "text": "port"}, {"matched": false, "text": "/ex"}, {"matched": true, "text": "port"}],
    "user": "eggs"
   },
   {
    "change": "-",
    "date": [2, 0],
    "lineno": 1,
    "node": "3b325e3481a1f07435d81dfdbfa434d9a0245b47",
    "path": "port",
    "rev": 2,
    "texts": [{"matched": false, "text": "im"}, {"matched": true, "text": "port"}],
    "user": "spam"
   },
   {
    "change": "+",
    "date": [2, 0],
    "lineno": 2,
    "node": "3b325e3481a1f07435d81dfdbfa434d9a0245b47",
    "path": "port",
    "rev": 2,
    "texts": [{"matched": false, "text": "va"}, {"matched": true, "text": "port"}, {"matched": false, "text": "ight"}],
    "user": "spam"
   },
   {
    "change": "+",
    "date": [2, 0],
    "lineno": 3,
    "node": "3b325e3481a1f07435d81dfdbfa434d9a0245b47",
    "path": "port",
    "rev": 2,
    "texts": [{"matched": false, "text": "im"}, {"matched": true, "text": "port"}, {"matched": false, "text": "/ex"}, {"matched": true, "text": "port"}],
    "user": "spam"
   },
   {
    "change": "+",
    "date": [1, 0],
    "lineno": 2,
    "node": "8b20f75c158513ff5ac80bd0e5219bfb6f0eb587",
    "path": "port",
    "rev": 1,
    "texts": [{"matched": false, "text": "ex"}, {"matched": true, "text": "port"}],
    "user": "eggs"
   },
   {
    "change": "+",
    "date": [0, 0],
    "lineno": 1,
    "node": "f31323c9217050ba245ee8b537c713ec2e8ab226",
    "path": "port",
    "rev": 0,
    "texts": [{"matched": false, "text": "im"}, {"matched": true, "text": "port"}],
    "user": "spam"
   }
  ]

other

  $ hg grep -r tip:0 -l port port
  port:4
  port:3
  port:2
  port:1
  port:0
  $ hg grep -r tip:0 import port
  port:4:import/export
  port:3:import/export
  port:3:import/export
  port:2:import/export
  port:1:import
  port:0:import

  $ hg cp port port2
  $ hg commit -m 4 -u spam -d '5 0'

follow

  $ hg grep -r tip:0 --traceback -f 'import\n\Z' port2
  [1]
  $ echo deport >> port2
  $ hg commit -m 5 -u eggs -d '6 0'
  $ hg grep -f --all -nu port port2
  port2:6:4:+:eggs:deport
  port:4:4:-:spam:import/export
  port:3:4:+:eggs:import/export
  port:2:1:-:spam:import
  port:2:2:+:spam:vaportight
  port:2:3:+:spam:import/export
  port:1:2:+:eggs:export
  port:0:1:+:spam:import

  $ hg up -q null
  $ hg grep -r 'reverse(:.)' -f port
  port:0:import

Test wdir
(at least, this shouldn't crash)

  $ hg up -q
  $ echo wport >> port2
  $ hg stat
  M port2
  $ hg grep -r 'wdir()' port
  port:2147483647:export
  port:2147483647:vaportight
  port:2147483647:import/export
  port2:2147483647:export
  port2:2147483647:vaportight
  port2:2147483647:import/export
  port2:2147483647:deport
  port2:2147483647:wport

  $ cd ..
  $ hg init t2
  $ cd t2
  $ hg grep -r tip:0 foobar foo
  [1]
  $ hg grep -r tip:0 foobar
  [1]
  $ echo blue >> color
  $ echo black >> color
  $ hg add color
  $ hg ci -m 0
  $ echo orange >> color
  $ hg ci -m 1
  $ echo black > color
  $ hg ci -m 2
  $ echo orange >> color
  $ echo blue >> color
  $ hg ci -m 3
  $ hg grep -r tip:0 orange
  color:3:orange
  color:1:orange
  $ hg grep --all orange
  color:3:+:orange
  color:2:-:orange
  color:1:+:orange
  $ hg grep --diff orange --color=debug
  [grep.filename|color][grep.sep|:][grep.rev|3][grep.sep|:][grep.inserted grep.change|+][grep.sep|:][grep.match|orange]
  [grep.filename|color][grep.sep|:][grep.rev|2][grep.sep|:][grep.deleted grep.change|-][grep.sep|:][grep.match|orange]
  [grep.filename|color][grep.sep|:][grep.rev|1][grep.sep|:][grep.inserted grep.change|+][grep.sep|:][grep.match|orange]

  $ hg grep --diff orange --color=yes
  \x1b[0;35mcolor\x1b[0m\x1b[0;36m:\x1b[0m\x1b[0;34m3\x1b[0m\x1b[0;36m:\x1b[0m\x1b[0;32;1m+\x1b[0m\x1b[0;36m:\x1b[0m\x1b[0;31;1morange\x1b[0m (esc)
  \x1b[0;35mcolor\x1b[0m\x1b[0;36m:\x1b[0m\x1b[0;34m2\x1b[0m\x1b[0;36m:\x1b[0m\x1b[0;31;1m-\x1b[0m\x1b[0;36m:\x1b[0m\x1b[0;31;1morange\x1b[0m (esc)
  \x1b[0;35mcolor\x1b[0m\x1b[0;36m:\x1b[0m\x1b[0;34m1\x1b[0m\x1b[0;36m:\x1b[0m\x1b[0;32;1m+\x1b[0m\x1b[0;36m:\x1b[0m\x1b[0;31;1morange\x1b[0m (esc)

  $ hg grep --diff orange
  color:3:+:orange
  color:2:-:orange
  color:1:+:orange

revset predicate for "grep --diff"

  $ hg log -qr 'diffcontains("re:^bl...$")'
  0:203191eb5e21
  $ hg log -qr 'diffcontains("orange")'
  1:7c585a21e0d1
  2:11bd8bc8d653
  3:e0116d3829f8
  $ hg log -qr '2:0 & diffcontains("orange")'
  2:11bd8bc8d653
  1:7c585a21e0d1

test substring match: '^' should only match at the beginning

  $ hg grep -r tip:0 '^.' --config extensions.color= --color debug
  [grep.filename|color][grep.sep|:][grep.rev|3][grep.sep|:][grep.match|b]lack
  [grep.filename|color][grep.sep|:][grep.rev|3][grep.sep|:][grep.match|o]range
  [grep.filename|color][grep.sep|:][grep.rev|3][grep.sep|:][grep.match|b]lue
  [grep.filename|color][grep.sep|:][grep.rev|2][grep.sep|:][grep.match|b]lack
  [grep.filename|color][grep.sep|:][grep.rev|1][grep.sep|:][grep.match|b]lue
  [grep.filename|color][grep.sep|:][grep.rev|1][grep.sep|:][grep.match|b]lack
  [grep.filename|color][grep.sep|:][grep.rev|1][grep.sep|:][grep.match|o]range
  [grep.filename|color][grep.sep|:][grep.rev|0][grep.sep|:][grep.match|b]lue
  [grep.filename|color][grep.sep|:][grep.rev|0][grep.sep|:][grep.match|b]lack

match in last "line" without newline

  $ "$PYTHON" -c 'fp = open("noeol", "wb"); fp.write(b"no infinite loop"); fp.close();'
  $ hg ci -Amnoeol
  adding noeol
  $ hg grep -r tip:0 loop
  noeol:4:no infinite loop

  $ cd ..

Issue685: traceback in grep -r after rename

Got a traceback when using grep on a single
revision with renamed files.

  $ hg init issue685
  $ cd issue685
  $ echo octarine > color
  $ hg ci -Amcolor
  adding color
  $ hg rename color colour
  $ hg ci -Am rename
  $ hg grep -r tip:0 octarine
  colour:1:octarine
  color:0:octarine

Used to crash here

  $ hg grep -r 1 octarine
  colour:1:octarine
  $ cd ..


Issue337: test that grep follows parent-child relationships instead
of just using revision numbers.

  $ hg init issue337
  $ cd issue337

  $ echo white > color
  $ hg commit -A -m "0 white"
  adding color

  $ echo red > color
  $ hg commit -A -m "1 red"

  $ hg update 0
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ echo black > color
  $ hg commit -A -m "2 black"
  created new head

  $ hg update --clean 1
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ echo blue > color
  $ hg commit -A -m "3 blue"

  $ hg grep --all red
  color:3:-:red
  color:1:+:red

  $ hg grep --diff red
  color:3:-:red
  color:1:+:red

Issue3885: test that changing revision order does not alter the
revisions printed, just their order.

  $ hg grep --all red -r "all()"
  color:1:+:red
  color:3:-:red

  $ hg grep --all red -r "reverse(all())"
  color:3:-:red
  color:1:+:red

  $ hg grep --diff red -r "all()"
  color:1:+:red
  color:3:-:red

  $ hg grep --diff red -r "reverse(all())"
  color:3:-:red
  color:1:+:red

  $ cd ..

  $ hg init a
  $ cd a
  $ cp "$TESTDIR/binfile.bin" .
  $ hg add binfile.bin
  $ hg ci -m 'add binfile.bin'
  $ hg grep "MaCam" --all
  binfile.bin:0:+: Binary file matches

  $ hg grep "MaCam" --diff
  binfile.bin:0:+: Binary file matches

  $ cd ..

Moved line may not be collected by "grep --diff" since it first filters
the contents to be diffed by the pattern. (i.e.
"diff <(grep pat a) <(grep pat b)", not "diff a b | grep pat".)
This is much faster than generating full diff per revision.

  $ hg init moved-line
  $ cd moved-line
  $ cat <<'EOF' > a
  > foo
  > bar
  > baz
  > EOF
  $ hg ci -Am initial
  adding a
  $ cat <<'EOF' > a
  > bar
  > baz
  > foo
  > EOF
  $ hg ci -m reorder

  $ hg diff -c 1
  diff -r a593cc55e81b -r 69789a3b6e80 a
  --- a/a	Thu Jan 01 00:00:00 1970 +0000
  +++ b/a	Thu Jan 01 00:00:00 1970 +0000
  @@ -1,3 +1,3 @@
  -foo
   bar
   baz
  +foo

 can't find the move of "foo" at the revision 1:

  $ hg grep --diff foo -r1
  [1]

 "bar" isn't moved at the revisoin 1:

  $ hg grep --diff bar -r1
  [1]

  $ cd ..

Test for showing working of allfiles flag

  $ hg init sng
  $ cd sng
  $ echo "unmod" >> um
  $ echo old > old
  $ hg ci -q -A -m "adds unmod to um"
  $ echo "something else" >> new
  $ hg ci -A -m "second commit"
  adding new
  $ hg grep -r "." "unmod"
  um:1:unmod

Existing tracked files in the working directory are searched by default

  $ echo modified >> new
  $ echo 'added' > added; hg add added
  $ echo 'added, missing' > added-missing; hg add added-missing; rm added-missing
  $ echo 'untracked' > untracked
  $ hg rm old
  $ hg grep ''
  added:added
  new:something else
  new:modified
  um:unmod

#if symlink
Grepping a symlink greps its destination

  $ rm -f added; ln -s symlink-added added
  $ hg grep '' | grep added
  added:symlink-added

But we reject symlinks as directories components of a tracked file as
usual:

  $ mkdir dir; touch dir/f; hg add dir/f
  $ rm -rf dir; ln -s / dir
  $ hg grep ''
  abort: path 'dir/f' traverses symbolic link 'dir'
  [255]
#endif

But we can search files from some other revision with -rREV

  $ hg grep -r. mod
  um:1:unmod

  $ hg grep --diff mod
  um:0:+:unmod

  $ cd ..

Change Default of grep by ui.tweakdefaults, that is, the files not in current
working directory should not be grepp-ed on

  $ hg init ab
  $ cd ab
  $ cat <<'EOF' >> .hg/hgrc
  > [ui]
  > tweakdefaults = True
  > EOF
  $ echo "some text">>file1
  $ hg add file1
  $ hg commit -m "adds file1"
  $ hg mv file1 file2

wdir revision is hidden by default:

  $ hg grep "some"
  file2:some text

but it should be available in template dict:

  $ hg grep "some" -Tjson
  [
   {
    "date": [0, 0],
    "lineno": 1,
    "node": "ffffffffffffffffffffffffffffffffffffffff",
    "path": "file2",
    "rev": 2147483647,
    "texts": [{"matched": true, "text": "some"}, {"matched": false, "text": " text"}],
    "user": "test"
   }
  ]

  $ cd ..

test -rMULTIREV

  $ cd sng
  $ hg rm um
  $ hg commit -m "deletes um"
  $ hg grep -r "0:2" "unmod"
  um:0:unmod
  um:1:unmod
  $ hg grep -r "0:2" "unmod" um
  um:0:unmod
  um:1:unmod
  $ hg grep -r "0:2" "unmod" "glob:**/um" # Check that patterns also work
  um:0:unmod
  um:1:unmod
  $ cd ..

--follow with/without --diff and/or paths
-----------------------------------------

For each test case, we compare the history traversal of "hg log",
"hg grep --diff", and "hg grep" (--all-files).

"hg grep --diff" should traverse the log in the same way as "hg log".
"hg grep" (--all-files) is slightly different in that it includes
unmodified changes.

  $ hg init follow
  $ cd follow

  $ cat <<'EOF' >> .hg/hgrc
  > [command-templates]
  > log = '{rev}: {join(files % "{status} {path}", ", ")}\n'
  > EOF

  $ for f in add0 add0-mod1 add0-rm1 add0-mod2 add0-rm2 add0-mod3 add0-mod4 add0-rm4; do
  > echo data0 >> $f
  > done
  $ hg ci -qAm0

  $ hg cp add0 add0-cp1
  $ hg cp add0 add0-cp1-mod1
  $ hg cp add0 add0-cp1-mod1-rm3
  $ hg rm add0-rm1
  $ for f in *mod1*; do
  > echo data1 >> $f
  > done
  $ hg ci -qAm1

  $ hg update -q 0
  $ hg cp add0 add0-cp2
  $ hg cp add0 add0-cp2-mod2
  $ hg rm add0-rm2
  $ for f in *mod2*; do
  > echo data2 >> $f
  > done
  $ hg ci -qAm2

  $ hg update -q 1
  $ hg cp add0-cp1 add0-cp1-cp3
  $ hg cp add0-cp1-mod1 add0-cp1-mod1-cp3-mod3
  $ hg rm add0-cp1-mod1-rm3
  $ for f in *mod3*; do
  > echo data3 >> $f
  > done
  $ hg ci -qAm3

  $ hg cp add0 add0-cp4
  $ hg cp add0 add0-cp4-mod4
  $ hg rm add0-rm4
  $ for f in *mod4*; do
  > echo data4 >> $f
  > done

  $ hg log -Gr':wdir()'
  o  2147483647: A add0-cp4, A add0-cp4-mod4, M add0-mod4, R add0-rm4
  |
  @  3: A add0-cp1-cp3, A add0-cp1-mod1-cp3-mod3, R add0-cp1-mod1-rm3, M add0-mod3
  |
  | o  2: A add0-cp2, A add0-cp2-mod2, M add0-mod2, R add0-rm2
  | |
  o |  1: A add0-cp1, A add0-cp1-mod1, A add0-cp1-mod1-rm3, M add0-mod1, R add0-rm1
  |/
  o  0: A add0, A add0-mod1, A add0-mod2, A add0-mod3, A add0-mod4, A add0-rm1, A add0-rm2, A add0-rm4
  

follow revision history from wdir parent:

  $ hg log -f
  3: A add0-cp1-cp3, A add0-cp1-mod1-cp3-mod3, R add0-cp1-mod1-rm3, M add0-mod3
  1: A add0-cp1, A add0-cp1-mod1, A add0-cp1-mod1-rm3, M add0-mod1, R add0-rm1
  0: A add0, A add0-mod1, A add0-mod2, A add0-mod3, A add0-mod4, A add0-rm1, A add0-rm2, A add0-rm4

  $ hg grep --diff -f data
  add0-cp1-mod1-cp3-mod3:3:+:data3
  add0-mod3:3:+:data3
  add0-cp1-mod1:1:+:data1
  add0-cp1-mod1-rm3:1:+:data1
  add0-mod1:1:+:data1
  add0:0:+:data0
  add0-mod1:0:+:data0
  add0-mod2:0:+:data0
  add0-mod3:0:+:data0
  add0-mod4:0:+:data0
  add0-rm1:0:+:data0
  add0-rm2:0:+:data0
  add0-rm4:0:+:data0

  $ hg grep -f data
  add0:3:data0
  add0-cp1:3:data0
  add0-cp1-cp3:3:data0
  add0-cp1-mod1:3:data0
  add0-cp1-mod1:3:data1
  add0-cp1-mod1-cp3-mod3:3:data0
  add0-cp1-mod1-cp3-mod3:3:data1
  add0-cp1-mod1-cp3-mod3:3:data3
  add0-mod1:3:data0
  add0-mod1:3:data1
  add0-mod2:3:data0
  add0-mod3:3:data0
  add0-mod3:3:data3
  add0-mod4:3:data0
  add0-rm2:3:data0
  add0-rm4:3:data0
  add0:1:data0
  add0-cp1:1:data0
  add0-cp1-mod1:1:data0
  add0-cp1-mod1:1:data1
  add0-cp1-mod1-rm3:1:data0
  add0-cp1-mod1-rm3:1:data1
  add0-mod1:1:data0
  add0-mod1:1:data1
  add0-mod2:1:data0
  add0-mod3:1:data0
  add0-mod4:1:data0
  add0-rm2:1:data0
  add0-rm4:1:data0
  add0:0:data0
  add0-mod1:0:data0
  add0-mod2:0:data0
  add0-mod3:0:data0
  add0-mod4:0:data0
  add0-rm1:0:data0
  add0-rm2:0:data0
  add0-rm4:0:data0

follow revision history from specified revision:

  $ hg log -fr2
  2: A add0-cp2, A add0-cp2-mod2, M add0-mod2, R add0-rm2
  0: A add0, A add0-mod1, A add0-mod2, A add0-mod3, A add0-mod4, A add0-rm1, A add0-rm2, A add0-rm4

  $ hg grep --diff -fr2 data
  add0-cp2-mod2:2:+:data2
  add0-mod2:2:+:data2
  add0:0:+:data0
  add0-mod1:0:+:data0
  add0-mod2:0:+:data0
  add0-mod3:0:+:data0
  add0-mod4:0:+:data0
  add0-rm1:0:+:data0
  add0-rm2:0:+:data0
  add0-rm4:0:+:data0

  $ hg grep -fr2 data
  add0:2:data0
  add0-cp2:2:data0
  add0-cp2-mod2:2:data0
  add0-cp2-mod2:2:data2
  add0-mod1:2:data0
  add0-mod2:2:data0
  add0-mod2:2:data2
  add0-mod3:2:data0
  add0-mod4:2:data0
  add0-rm1:2:data0
  add0-rm4:2:data0
  add0:0:data0
  add0-mod1:0:data0
  add0-mod2:0:data0
  add0-mod3:0:data0
  add0-mod4:0:data0
  add0-rm1:0:data0
  add0-rm2:0:data0
  add0-rm4:0:data0

follow revision history from wdir:

  $ hg log -fr'wdir()'
  2147483647: A add0-cp4, A add0-cp4-mod4, M add0-mod4, R add0-rm4
  3: A add0-cp1-cp3, A add0-cp1-mod1-cp3-mod3, R add0-cp1-mod1-rm3, M add0-mod3
  1: A add0-cp1, A add0-cp1-mod1, A add0-cp1-mod1-rm3, M add0-mod1, R add0-rm1
  0: A add0, A add0-mod1, A add0-mod2, A add0-mod3, A add0-mod4, A add0-rm1, A add0-rm2, A add0-rm4

 BROKEN: should not abort because of removed file
  $ hg grep --diff -fr'wdir()' data
  add0-cp4-mod4:2147483647:+:data4
  add0-mod4:2147483647:+:data4
  add0-rm4:2147483647:-:abort: add0-rm4@None: not found in manifest
  [50]

  $ hg grep -fr'wdir()' data
  add0:2147483647:data0
  add0-cp1:2147483647:data0
  add0-cp1-cp3:2147483647:data0
  add0-cp1-mod1:2147483647:data0
  add0-cp1-mod1:2147483647:data1
  add0-cp1-mod1-cp3-mod3:2147483647:data0
  add0-cp1-mod1-cp3-mod3:2147483647:data1
  add0-cp1-mod1-cp3-mod3:2147483647:data3
  add0-cp4:2147483647:data0
  add0-cp4-mod4:2147483647:data0
  add0-cp4-mod4:2147483647:data4
  add0-mod1:2147483647:data0
  add0-mod1:2147483647:data1
  add0-mod2:2147483647:data0
  add0-mod3:2147483647:data0
  add0-mod3:2147483647:data3
  add0-mod4:2147483647:data0
  add0-mod4:2147483647:data4
  add0-rm2:2147483647:data0
  add0:3:data0
  add0-cp1:3:data0
  add0-cp1-cp3:3:data0
  add0-cp1-mod1:3:data0
  add0-cp1-mod1:3:data1
  add0-cp1-mod1-cp3-mod3:3:data0
  add0-cp1-mod1-cp3-mod3:3:data1
  add0-cp1-mod1-cp3-mod3:3:data3
  add0-mod1:3:data0
  add0-mod1:3:data1
  add0-mod2:3:data0
  add0-mod3:3:data0
  add0-mod3:3:data3
  add0-mod4:3:data0
  add0-rm2:3:data0
  add0-rm4:3:data0
  add0:1:data0
  add0-cp1:1:data0
  add0-cp1-mod1:1:data0
  add0-cp1-mod1:1:data1
  add0-cp1-mod1-rm3:1:data0
  add0-cp1-mod1-rm3:1:data1
  add0-mod1:1:data0
  add0-mod1:1:data1
  add0-mod2:1:data0
  add0-mod3:1:data0
  add0-mod4:1:data0
  add0-rm2:1:data0
  add0-rm4:1:data0
  add0:0:data0
  add0-mod1:0:data0
  add0-mod2:0:data0
  add0-mod3:0:data0
  add0-mod4:0:data0
  add0-rm1:0:data0
  add0-rm2:0:data0
  add0-rm4:0:data0

follow revision history from multiple revisions:

  $ hg log -fr'1+2'
  2: A add0-cp2, A add0-cp2-mod2, M add0-mod2, R add0-rm2
  1: A add0-cp1, A add0-cp1-mod1, A add0-cp1-mod1-rm3, M add0-mod1, R add0-rm1
  0: A add0, A add0-mod1, A add0-mod2, A add0-mod3, A add0-mod4, A add0-rm1, A add0-rm2, A add0-rm4

  $ hg grep --diff -fr'1+2' data
  add0-cp2-mod2:2:+:data2
  add0-mod2:2:+:data2
  add0-cp1-mod1:1:+:data1
  add0-cp1-mod1-rm3:1:+:data1
  add0-mod1:1:+:data1
  add0:0:+:data0
  add0-mod1:0:+:data0
  add0-mod2:0:+:data0
  add0-mod3:0:+:data0
  add0-mod4:0:+:data0
  add0-rm1:0:+:data0
  add0-rm2:0:+:data0
  add0-rm4:0:+:data0

  $ hg grep -fr'1+2' data
  add0:2:data0
  add0-cp2:2:data0
  add0-cp2-mod2:2:data0
  add0-cp2-mod2:2:data2
  add0-mod1:2:data0
  add0-mod2:2:data0
  add0-mod2:2:data2
  add0-mod3:2:data0
  add0-mod4:2:data0
  add0-rm1:2:data0
  add0-rm4:2:data0
  add0:1:data0
  add0-cp1:1:data0
  add0-cp1-mod1:1:data0
  add0-cp1-mod1:1:data1
  add0-cp1-mod1-rm3:1:data0
  add0-cp1-mod1-rm3:1:data1
  add0-mod1:1:data0
  add0-mod1:1:data1
  add0-mod2:1:data0
  add0-mod3:1:data0
  add0-mod4:1:data0
  add0-rm2:1:data0
  add0-rm4:1:data0
  add0:0:data0
  add0-mod1:0:data0
  add0-mod2:0:data0
  add0-mod3:0:data0
  add0-mod4:0:data0
  add0-rm1:0:data0
  add0-rm2:0:data0
  add0-rm4:0:data0

follow file history from wdir parent, unmodified in wdir:

  $ hg log -f add0-mod3
  3: A add0-cp1-cp3, A add0-cp1-mod1-cp3-mod3, R add0-cp1-mod1-rm3, M add0-mod3
  0: A add0, A add0-mod1, A add0-mod2, A add0-mod3, A add0-mod4, A add0-rm1, A add0-rm2, A add0-rm4

  $ hg grep --diff -f data add0-mod3
  add0-mod3:3:+:data3
  add0-mod3:0:+:data0

  $ hg grep -f data add0-mod3
  add0-mod3:3:data0
  add0-mod3:3:data3
  add0-mod3:1:data0
  add0-mod3:0:data0

follow file history from wdir parent, modified in wdir:

  $ hg log -f add0-mod4
  0: A add0, A add0-mod1, A add0-mod2, A add0-mod3, A add0-mod4, A add0-rm1, A add0-rm2, A add0-rm4

  $ hg grep --diff -f data add0-mod4
  add0-mod4:0:+:data0

  $ hg grep -f data add0-mod4
  add0-mod4:3:data0
  add0-mod4:1:data0
  add0-mod4:0:data0

follow file history from wdir parent, copied but unmodified:

  $ hg log -f add0-cp1-cp3
  3: A add0-cp1-cp3, A add0-cp1-mod1-cp3-mod3, R add0-cp1-mod1-rm3, M add0-mod3
  1: A add0-cp1, A add0-cp1-mod1, A add0-cp1-mod1-rm3, M add0-mod1, R add0-rm1
  0: A add0, A add0-mod1, A add0-mod2, A add0-mod3, A add0-mod4, A add0-rm1, A add0-rm2, A add0-rm4

  $ hg grep --diff -f data add0-cp1-cp3
  add0:0:+:data0

 BROKEN: should follow history across renames
  $ hg grep -f data add0-cp1-cp3
  add0-cp1-cp3:3:data0

follow file history from wdir parent, copied and modified:

  $ hg log -f add0-cp1-mod1-cp3-mod3
  3: A add0-cp1-cp3, A add0-cp1-mod1-cp3-mod3, R add0-cp1-mod1-rm3, M add0-mod3
  1: A add0-cp1, A add0-cp1-mod1, A add0-cp1-mod1-rm3, M add0-mod1, R add0-rm1
  0: A add0, A add0-mod1, A add0-mod2, A add0-mod3, A add0-mod4, A add0-rm1, A add0-rm2, A add0-rm4

  $ hg grep --diff -f data add0-cp1-mod1-cp3-mod3
  add0-cp1-mod1-cp3-mod3:3:+:data3
  add0-cp1-mod1:1:+:data1
  add0:0:+:data0

 BROKEN: should follow history across renames
  $ hg grep -f data add0-cp1-mod1-cp3-mod3
  add0-cp1-mod1-cp3-mod3:3:data0
  add0-cp1-mod1-cp3-mod3:3:data1
  add0-cp1-mod1-cp3-mod3:3:data3

follow file history from wdir parent, copied in wdir:

  $ hg log -f add0-cp4
  abort: cannot follow nonexistent file: "add0-cp4"
  [20]

  $ hg grep --diff -f data add0-cp4
  abort: cannot follow nonexistent file: "add0-cp4"
  [20]

 BROKEN: maybe better to abort
  $ hg grep -f data add0-cp4
  [1]

follow file history from wdir parent, removed:

  $ hg log -f add0-cp1-mod1-rm3
  abort: cannot follow file not in parent revision: "add0-cp1-mod1-rm3"
  [20]

  $ hg grep --diff -f data add0-cp1-mod1-rm3
  abort: cannot follow file not in parent revision: "add0-cp1-mod1-rm3"
  [20]

 BROKEN: maybe better to abort
  $ hg grep -f data add0-cp1-mod1-rm3
  add0-cp1-mod1-rm3:1:data0
  add0-cp1-mod1-rm3:1:data1

follow file history from wdir parent (explicit), removed:

  $ hg log -fr. add0-cp1-mod1-rm3
  abort: cannot follow file not in any of the specified revisions: "add0-cp1-mod1-rm3"
  [20]

  $ hg grep --diff -fr. data add0-cp1-mod1-rm3
  abort: cannot follow file not in any of the specified revisions: "add0-cp1-mod1-rm3"
  [20]

 BROKEN: should abort
  $ hg grep -fr. data add0-cp1-mod1-rm3
  add0-cp1-mod1-rm3:1:data0
  add0-cp1-mod1-rm3:1:data1

follow file history from wdir parent, removed in wdir:

  $ hg log -f add0-rm4
  abort: cannot follow file not in parent revision: "add0-rm4"
  [20]

  $ hg grep --diff -f data add0-rm4
  abort: cannot follow file not in parent revision: "add0-rm4"
  [20]

 BROKEN: should abort
  $ hg grep -f data add0-rm4
  add0-rm4:3:data0
  add0-rm4:1:data0
  add0-rm4:0:data0

follow file history from wdir parent (explicit), removed in wdir:

  $ hg log -fr. add0-rm4
  0: A add0, A add0-mod1, A add0-mod2, A add0-mod3, A add0-mod4, A add0-rm1, A add0-rm2, A add0-rm4

  $ hg grep --diff -fr. data add0-rm4
  add0-rm4:0:+:data0

  $ hg grep -fr. data add0-rm4
  add0-rm4:3:data0
  add0-rm4:1:data0
  add0-rm4:0:data0

follow file history from wdir parent, multiple files:

  $ hg log -f add0-mod3 add0-cp1-mod1
  3: A add0-cp1-cp3, A add0-cp1-mod1-cp3-mod3, R add0-cp1-mod1-rm3, M add0-mod3
  1: A add0-cp1, A add0-cp1-mod1, A add0-cp1-mod1-rm3, M add0-mod1, R add0-rm1
  0: A add0, A add0-mod1, A add0-mod2, A add0-mod3, A add0-mod4, A add0-rm1, A add0-rm2, A add0-rm4

  $ hg grep --diff -f data add0-mod3 add0-cp1-mod1
  add0-mod3:3:+:data3
  add0-cp1-mod1:1:+:data1
  add0:0:+:data0
  add0-mod3:0:+:data0

 BROKEN: should follow history across renames
  $ hg grep -f data add0-mod3 add0-cp1-mod1
  add0-cp1-mod1:3:data0
  add0-cp1-mod1:3:data1
  add0-mod3:3:data0
  add0-mod3:3:data3
  add0-cp1-mod1:1:data0
  add0-cp1-mod1:1:data1
  add0-mod3:1:data0
  add0-mod3:0:data0

follow file history from specified revision, modified:

  $ hg log -fr2 add0-mod2
  2: A add0-cp2, A add0-cp2-mod2, M add0-mod2, R add0-rm2
  0: A add0, A add0-mod1, A add0-mod2, A add0-mod3, A add0-mod4, A add0-rm1, A add0-rm2, A add0-rm4

  $ hg grep --diff -fr2 data add0-mod2
  add0-mod2:2:+:data2
  add0-mod2:0:+:data0

  $ hg grep -fr2 data add0-mod2
  add0-mod2:2:data0
  add0-mod2:2:data2
  add0-mod2:0:data0

follow file history from specified revision, copied but unmodified:

  $ hg log -fr2 add0-cp2
  2: A add0-cp2, A add0-cp2-mod2, M add0-mod2, R add0-rm2
  0: A add0, A add0-mod1, A add0-mod2, A add0-mod3, A add0-mod4, A add0-rm1, A add0-rm2, A add0-rm4

  $ hg grep --diff -fr2 data add0-cp2
  add0:0:+:data0

 BROKEN: should follow history across renames
  $ hg grep -fr2 data add0-cp2
  add0-cp2:2:data0

follow file history from specified revision, copied and modified:

  $ hg log -fr2 add0-cp2-mod2
  2: A add0-cp2, A add0-cp2-mod2, M add0-mod2, R add0-rm2
  0: A add0, A add0-mod1, A add0-mod2, A add0-mod3, A add0-mod4, A add0-rm1, A add0-rm2, A add0-rm4

  $ hg grep --diff -fr2 data add0-cp2-mod2
  add0-cp2-mod2:2:+:data2
  add0:0:+:data0

 BROKEN: should follow history across renames
  $ hg grep -fr2 data add0-cp2-mod2
  add0-cp2-mod2:2:data0
  add0-cp2-mod2:2:data2

follow file history from specified revision, removed:

  $ hg log -fr2 add0-rm2
  abort: cannot follow file not in any of the specified revisions: "add0-rm2"
  [20]

  $ hg grep --diff -fr2 data add0-rm2
  abort: cannot follow file not in any of the specified revisions: "add0-rm2"
  [20]

 BROKEN: should abort
  $ hg grep -fr2 data add0-rm2
  add0-rm2:0:data0

follow file history from specified revision, multiple files:

  $ hg log -fr2 add0-cp2 add0-mod2
  2: A add0-cp2, A add0-cp2-mod2, M add0-mod2, R add0-rm2
  0: A add0, A add0-mod1, A add0-mod2, A add0-mod3, A add0-mod4, A add0-rm1, A add0-rm2, A add0-rm4

  $ hg grep --diff -fr2 data add0-cp2 add0-mod2
  add0-mod2:2:+:data2
  add0:0:+:data0
  add0-mod2:0:+:data0

 BROKEN: should follow history across renames
  $ hg grep -fr2 data add0-cp2 add0-mod2
  add0-cp2:2:data0
  add0-mod2:2:data0
  add0-mod2:2:data2
  add0-mod2:0:data0

follow file history from wdir, unmodified:

  $ hg log -fr'wdir()' add0-mod3
  2147483647: A add0-cp4, A add0-cp4-mod4, M add0-mod4, R add0-rm4
  3: A add0-cp1-cp3, A add0-cp1-mod1-cp3-mod3, R add0-cp1-mod1-rm3, M add0-mod3
  0: A add0, A add0-mod1, A add0-mod2, A add0-mod3, A add0-mod4, A add0-rm1, A add0-rm2, A add0-rm4

  $ hg grep --diff -fr'wdir()' data add0-mod3
  add0-mod3:3:+:data3
  add0-mod3:0:+:data0

  $ hg grep -fr'wdir()' data add0-mod3
  add0-mod3:2147483647:data0
  add0-mod3:2147483647:data3
  add0-mod3:3:data0
  add0-mod3:3:data3
  add0-mod3:1:data0
  add0-mod3:0:data0

follow file history from wdir, modified:

  $ hg log -fr'wdir()' add0-mod4
  2147483647: A add0-cp4, A add0-cp4-mod4, M add0-mod4, R add0-rm4
  0: A add0, A add0-mod1, A add0-mod2, A add0-mod3, A add0-mod4, A add0-rm1, A add0-rm2, A add0-rm4

  $ hg grep --diff -fr'wdir()' data add0-mod4
  add0-mod4:2147483647:+:data4
  add0-mod4:0:+:data0

  $ hg grep -fr'wdir()' data add0-mod4
  add0-mod4:2147483647:data0
  add0-mod4:2147483647:data4
  add0-mod4:3:data0
  add0-mod4:1:data0
  add0-mod4:0:data0

follow file history from wdir, copied but unmodified:

  $ hg log -fr'wdir()' add0-cp4
  2147483647: A add0-cp4, A add0-cp4-mod4, M add0-mod4, R add0-rm4
  0: A add0, A add0-mod1, A add0-mod2, A add0-mod3, A add0-mod4, A add0-rm1, A add0-rm2, A add0-rm4

  $ hg grep --diff -fr'wdir()' data add0-cp4
  add0:0:+:data0

 BROKEN: should follow history across renames
  $ hg grep -fr'wdir()' data add0-cp4
  add0-cp4:2147483647:data0

follow file history from wdir, copied and modified:

  $ hg log -fr'wdir()' add0-cp4-mod4
  2147483647: A add0-cp4, A add0-cp4-mod4, M add0-mod4, R add0-rm4
  0: A add0, A add0-mod1, A add0-mod2, A add0-mod3, A add0-mod4, A add0-rm1, A add0-rm2, A add0-rm4

  $ hg grep --diff -fr'wdir()' data add0-cp4-mod4
  add0-cp4-mod4:2147483647:+:data4
  add0:0:+:data0

 BROKEN: should follow history across renames
  $ hg grep -fr'wdir()' data add0-cp4-mod4
  add0-cp4-mod4:2147483647:data0
  add0-cp4-mod4:2147483647:data4

follow file history from wdir, multiple files:

  $ hg log -fr'wdir()' add0-cp4 add0-mod4 add0-mod3
  2147483647: A add0-cp4, A add0-cp4-mod4, M add0-mod4, R add0-rm4
  3: A add0-cp1-cp3, A add0-cp1-mod1-cp3-mod3, R add0-cp1-mod1-rm3, M add0-mod3
  0: A add0, A add0-mod1, A add0-mod2, A add0-mod3, A add0-mod4, A add0-rm1, A add0-rm2, A add0-rm4

  $ hg grep --diff -fr'wdir()' data add0-cp4 add0-mod4 add0-mod3
  add0-mod4:2147483647:+:data4
  add0-mod3:3:+:data3
  add0:0:+:data0
  add0-mod3:0:+:data0
  add0-mod4:0:+:data0

 BROKEN: should follow history across renames
  $ hg grep -fr'wdir()' data add0-cp4 add0-mod4 add0-mod3
  add0-cp4:2147483647:data0
  add0-mod3:2147483647:data0
  add0-mod3:2147483647:data3
  add0-mod4:2147483647:data0
  add0-mod4:2147483647:data4
  add0-mod3:3:data0
  add0-mod3:3:data3
  add0-mod4:3:data0
  add0-mod3:1:data0
  add0-mod4:1:data0
  add0-mod3:0:data0
  add0-mod4:0:data0

  $ cd ..