view tests/test-annotate.t @ 44950:f9734b2d59cc

py3: make stdout line-buffered if connected to a TTY

Status messages that are to be shown on the terminal should be written to the
file descriptor before anything further is done, to keep the user updated.

One common way to achieve this is to make stdout line-buffered if it is
connected to a TTY. This is done on Python 2 (except on Windows, where libc,
which the CPython 2 streams depend on, does not properly support this).

Python 3 rolls it own I/O streams. On Python 3, buffered binary streams can't be
set line-buffered. The previous code (added in 227ba1afcb65) incorrectly
assumed that on Python 3, pycompat.stdout (sys.stdout.buffer) is already
line-buffered. However the interpreter initializes it with a block-buffered
stream or an unbuffered stream (when the -u option or the PYTHONUNBUFFERED
environment variable is set), never with a line-buffered stream.

One example where the current behavior is unacceptable is when running
`hg pull https://www.mercurial-scm.org/repo/hg` on Python 3, where the line
"pulling from https://www.mercurial-scm.org/repo/hg" does not appear on the
terminal before the hg process blocks while waiting for the server.

Various approaches to fix this problem are possible, including:

1. Weaken the contract of procutil.stdout to not give any guarantees about
   buffering behavior. In this case, users of procutil.stdout need to be
   changed to do enough flushes. In particular,
  1. either ui must insert enough flushes for ui.write() and friends, or
  2. ui.write() and friends get split into flushing and fully buffered
     methods, or
  3. users of ui.write() and friends must flush explicitly.
2. Make stdout unbuffered.
3. Make stdout line-buffered. Since Python 3 does not natively support that for
   binary streams, we must implement it ourselves.

(2.) is problematic because using unbuffered I/O changes the performance
characteristics significantly compared to line-buffered (which is used on
Python 2) and this would be a regression.

(1.2.) and (1.3) are a substantial amount of work. It’s unclear whether the
added complexity would be justified, given that raw performance doesn’t matter
that much when writing to a terminal much faster than the user could read it.

(1.1.) pushes complexity into the ui class instead of separating the concern of
how stdout is buffered. Other users of procutil.stdout would still need to take
care of the flushes.

This patch implements (3.). The general performance considerations are very
similar to (1.1.). The extra method invocation and method forwarding add a
little more overhead if the class is used. In exchange, it doesn’t add overhead
if not used.


For the benchmarks, I compared the previous implementation (incorrect on Python
3), (1.1.), (3.) and (2.). The command was chosen so that the streams were
configured as if they were writing to a TTY, but actually write to a pager,
which is also the default:
HGRCPATH=/dev/null python3 ./hg --cwd ~/vcs/mozilla-central --time --pager yes --config pager.pager='cat > /dev/null' status --all

previous:
time: real 7.880 secs (user 7.290+0.050 sys 0.580+0.170)
time: real 7.830 secs (user 7.220+0.070 sys 0.590+0.140)
time: real 7.800 secs (user 7.210+0.050 sys 0.570+0.170)

(1.1.) using Yuya Nishihara’s patch:
time: real 9.860 secs (user 8.670+0.350 sys 1.160+0.830)
time: real 9.540 secs (user 8.430+0.370 sys 1.100+0.770)
time: real 9.830 secs (user 8.630+0.370 sys 1.180+0.840)

(3.) using this patch:
time: real 9.580 secs (user 8.480+0.350 sys 1.090+0.770)
time: real 9.670 secs (user 8.480+0.330 sys 1.170+0.860)
time: real 9.640 secs (user 8.500+0.350 sys 1.130+0.810)

(2.) using a previous patch by me:
time: real 10.480 secs (user 8.850+0.720 sys 1.590+1.500)
time: real 10.490 secs (user 8.750+0.750 sys 1.710+1.470)
time: real 10.240 secs (user 8.600+0.700 sys 1.590+1.510)


As expected, there’s no difference on Python 2, as exactly the same code paths
are used:

previous:
time: real 6.950 secs (user 5.870+0.330 sys 1.070+0.770)
time: real 7.040 secs (user 6.040+0.360 sys 0.980+0.750)
time: real 7.070 secs (user 5.950+0.360 sys 1.100+0.760)

this patch:
time: real 7.010 secs (user 5.900+0.390 sys 1.070+0.730)
time: real 7.000 secs (user 5.850+0.350 sys 1.120+0.760)
time: real 7.000 secs (user 5.790+0.380 sys 1.170+0.710)

  $ cat >> "$HGRCPATH" << EOF
  > [ui]
  > merge = :merge3
  > EOF

init

  $ hg init repo
  $ cd repo

commit

  $ echo 'a' > a
  $ hg ci -A -m test -u nobody -d '1 0'
  adding a

annotate -c

  $ hg annotate -c a
  8435f90966e4: a

annotate -cl

  $ hg annotate -cl a
  8435f90966e4:1: a

annotate -d

  $ hg annotate -d a
  Thu Jan 01 00:00:01 1970 +0000: a

annotate -n

  $ hg annotate -n a
  0: a

annotate -nl

  $ hg annotate -nl a
  0:1: a

annotate -u

  $ hg annotate -u a
  nobody: a

annotate -cdnu

  $ hg annotate -cdnu a
  nobody 0 8435f90966e4 Thu Jan 01 00:00:01 1970 +0000: a

annotate -cdnul

  $ hg annotate -cdnul a
  nobody 0 8435f90966e4 Thu Jan 01 00:00:01 1970 +0000:1: a

annotate (JSON)

  $ hg annotate -Tjson a
  [
   {
    "lines": [{"line": "a\n", "rev": 0}],
    "path": "a"
   }
  ]

  $ hg annotate -Tjson -cdfnul a
  [
   {
    "lines": [{"date": [1.0, 0], "line": "a\n", "lineno": 1, "node": "8435f90966e442695d2ded29fdade2bac5ad8065", "path": "a", "rev": 0, "user": "nobody"}],
    "path": "a"
   }
  ]

log-like templating

  $ hg annotate -T'{lines % "{rev} {node|shortest}: {line}"}' a
  0 8435: a

'{lineno}' field should be populated as necessary

  $ hg annotate -T'{lines % "{rev}:{lineno}: {line}"}' a
  0:1: a
  $ hg annotate -Ta a \
  > --config templates.a='"{lines % "{rev}:{lineno}: {line}"}"'
  0:1: a

  $ cat <<EOF >>a
  > a
  > a
  > EOF
  $ hg ci -ma1 -d '1 0'
  $ hg cp a b
  $ hg ci -mb -d '1 0'
  $ cat <<EOF >> b
  > b4
  > b5
  > b6
  > EOF
  $ hg ci -mb2 -d '2 0'

default output of '{lines}' should be readable

  $ hg annotate -T'{lines}' a
  0: a
  1: a
  1: a
  $ hg annotate -T'{join(lines, "\n")}' a
  0: a
  
  1: a
  
  1: a

several filters can be applied to '{lines}'

  $ hg annotate -T'{lines|json}\n' a
  [{"line": "a\n", "rev": 0}, {"line": "a\n", "rev": 1}, {"line": "a\n", "rev": 1}]
  $ hg annotate -T'{lines|stringify}' a
  0: a
  1: a
  1: a
  $ hg annotate -T'{lines|count}\n' a
  3

annotate multiple files (JSON)

  $ hg annotate -Tjson a b
  [
   {
    "lines": [{"line": "a\n", "rev": 0}, {"line": "a\n", "rev": 1}, {"line": "a\n", "rev": 1}],
    "path": "a"
   },
   {
    "lines": [{"line": "a\n", "rev": 0}, {"line": "a\n", "rev": 1}, {"line": "a\n", "rev": 1}, {"line": "b4\n", "rev": 3}, {"line": "b5\n", "rev": 3}, {"line": "b6\n", "rev": 3}],
    "path": "b"
   }
  ]

annotate multiple files (template)

  $ hg annotate -T'== {path} ==\n{lines % "{rev}: {line}"}' a b
  == a ==
  0: a
  1: a
  1: a
  == b ==
  0: a
  1: a
  1: a
  3: b4
  3: b5
  3: b6

annotate -n b

  $ hg annotate -n b
  0: a
  1: a
  1: a
  3: b4
  3: b5
  3: b6

annotate --no-follow b

  $ hg annotate --no-follow b
  2: a
  2: a
  2: a
  3: b4
  3: b5
  3: b6

annotate -nl b

  $ hg annotate -nl b
  0:1: a
  1:2: a
  1:3: a
  3:4: b4
  3:5: b5
  3:6: b6

annotate -nf b

  $ hg annotate -nf b
  0 a: a
  1 a: a
  1 a: a
  3 b: b4
  3 b: b5
  3 b: b6

annotate -nlf b

  $ hg annotate -nlf b
  0 a:1: a
  1 a:2: a
  1 a:3: a
  3 b:4: b4
  3 b:5: b5
  3 b:6: b6

  $ hg up -C 2
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ cat <<EOF >> b
  > b4
  > c
  > b5
  > EOF
  $ hg ci -mb2.1 -d '2 0'
  created new head
  $ hg merge
  merging b
  warning: conflicts while merging b! (edit, then use 'hg resolve --mark')
  0 files updated, 0 files merged, 0 files removed, 1 files unresolved
  use 'hg resolve' to retry unresolved file merges or 'hg merge --abort' to abandon
  [1]
  $ cat b
  a
  a
  a
  <<<<<<< working copy: 5fbdc1152d97 - test: b2.1
  b4
  c
  b5
  ||||||| base
  =======
  b4
  b5
  b6
  >>>>>>> merge rev:    37ec9f5c3d1f - test: b2
  $ cat <<EOF > b
  > a
  > a
  > a
  > b4
  > c
  > b5
  > EOF
  $ hg resolve --mark -q
  $ rm b.orig
  $ hg ci -mmergeb -d '3 0'

annotate after merge

  $ hg annotate -nf b
  0 a: a
  1 a: a
  1 a: a
  3 b: b4
  4 b: c
  3 b: b5

annotate after merge with -l

  $ hg annotate -nlf b
  0 a:1: a
  1 a:2: a
  1 a:3: a
  3 b:4: b4
  4 b:5: c
  3 b:5: b5

  $ hg up -C 1
  0 files updated, 0 files merged, 1 files removed, 0 files unresolved
  $ hg cp a b
  $ cat <<EOF > b
  > a
  > z
  > a
  > EOF
  $ hg ci -mc -d '3 0'
  created new head
Work around the pure version not resolving the conflict like native code
#if pure
  $ hg merge
  merging b
  warning: conflicts while merging b! (edit, then use 'hg resolve --mark')
  0 files updated, 0 files merged, 0 files removed, 1 files unresolved
  use 'hg resolve' to retry unresolved file merges or 'hg merge --abort' to abandon
  [1]
  $ cat <<EOF > b
  > a
  > z
  > a
  > b4
  > c
  > b5
  > EOF
  $ hg resolve -m b
  (no more unresolved files)
  $ rm b.orig
#else
  $ hg merge
  merging b
  0 files updated, 1 files merged, 0 files removed, 0 files unresolved
  (branch merge, don't forget to commit)
#endif
  $ echo d >> b
  $ hg ci -mmerge2 -d '4 0'

annotate after rename merge

  $ hg annotate -nf b
  0 a: a
  6 b: z
  1 a: a
  3 b: b4
  4 b: c
  3 b: b5
  7 b: d

annotate after rename merge with -l

  $ hg annotate -nlf b
  0 a:1: a
  6 b:2: z
  1 a:3: a
  3 b:4: b4
  4 b:5: c
  3 b:5: b5
  7 b:7: d

--skip nothing (should be the same as no --skip at all)

  $ hg annotate -nlf b --skip '1::0'
  0 a:1: a
  6 b:2: z
  1 a:3: a
  3 b:4: b4
  4 b:5: c
  3 b:5: b5
  7 b:7: d

--skip a modified line. Note a slight behavior difference in pure - this is
because the pure code comes up with slightly different deltas internally.

  $ hg annotate -nlf b --skip 6
  0 a:1: a
  1 a:2* z (no-pure !)
  0 a:1* z (pure !)
  1 a:3: a
  3 b:4: b4
  4 b:5: c
  3 b:5: b5
  7 b:7: d

--skip added lines (and test multiple skip)

  $ hg annotate -nlf b --skip 3
  0 a:1: a
  6 b:2: z
  1 a:3: a
  1 a:3* b4
  4 b:5: c
  1 a:3* b5
  7 b:7: d

  $ hg annotate -nlf b --skip 4
  0 a:1: a
  6 b:2: z
  1 a:3: a
  3 b:4: b4
  1 a:3* c
  3 b:5: b5
  7 b:7: d

  $ hg annotate -nlf b --skip 3 --skip 4
  0 a:1: a
  6 b:2: z
  1 a:3: a
  1 a:3* b4
  1 a:3* c
  1 a:3* b5
  7 b:7: d

  $ hg annotate -nlf b --skip 'merge()'
  0 a:1: a
  6 b:2: z
  1 a:3: a
  3 b:4: b4
  4 b:5: c
  3 b:5: b5
  3 b:5* d

--skip everything -- use the revision the file was introduced in

  $ hg annotate -nlf b --skip 'all()'
  0 a:1: a
  0 a:1* z
  0 a:1* a
  0 a:1* b4
  0 a:1* c
  0 a:1* b5
  0 a:1* d

Issue2807: alignment of line numbers with -l

  $ echo more >> b
  $ hg ci -mmore -d '5 0'
  $ echo more >> b
  $ hg ci -mmore -d '6 0'
  $ echo more >> b
  $ hg ci -mmore -d '7 0'
  $ hg annotate -nlf b
   0 a: 1: a
   6 b: 2: z
   1 a: 3: a
   3 b: 4: b4
   4 b: 5: c
   3 b: 5: b5
   7 b: 7: d
   8 b: 8: more
   9 b: 9: more
  10 b:10: more

linkrev vs rev

  $ hg annotate -r tip -n a
  0: a
  1: a
  1: a

linkrev vs rev with -l

  $ hg annotate -r tip -nl a
  0:1: a
  1:2: a
  1:3: a

Issue589: "undelete" sequence leads to crash

annotate was crashing when trying to --follow something

like A -> B -> A

generate ABA rename configuration

  $ echo foo > foo
  $ hg add foo
  $ hg ci -m addfoo
  $ hg rename foo bar
  $ hg ci -m renamefoo
  $ hg rename bar foo
  $ hg ci -m renamebar

annotate after ABA with follow

  $ hg annotate --follow foo
  foo: foo

missing file

  $ hg ann nosuchfile
  abort: nosuchfile: no such file in rev e9e6b4fa872f
  [255]

annotate file without '\n' on last line

  $ printf "" > c
  $ hg ci -A -m test -u nobody -d '1 0'
  adding c
  $ hg annotate c
  $ printf "a\nb" > c
  $ hg ci -m test
  $ hg annotate c
  [0-9]+: a (re)
  [0-9]+: b (re)

Issue3841: check annotation of the file of which filelog includes
merging between the revision and its ancestor

to reproduce the situation with recent Mercurial, this script uses (1)
"hg debugsetparents" to merge without ancestor check by "hg merge",
and (2) the extension to allow filelog merging between the revision
and its ancestor by overriding "repo._filecommit".

  $ cat > ../legacyrepo.py <<EOF
  > from __future__ import absolute_import
  > from mercurial import error, node
  > def reposetup(ui, repo):
  >     class legacyrepo(repo.__class__):
  >         def _filecommit(self, fctx, manifest1, manifest2,
  >                         linkrev, tr, changelist, includecopymeta):
  >             fname = fctx.path()
  >             text = fctx.data()
  >             flog = self.file(fname)
  >             fparent1 = manifest1.get(fname, node.nullid)
  >             fparent2 = manifest2.get(fname, node.nullid)
  >             meta = {}
  >             copy = fctx.copysource()
  >             if copy and copy != fname:
  >                 raise error.Abort('copying is not supported')
  >             if fparent2 != node.nullid:
  >                 changelist.append(fname)
  >                 return flog.add(text, meta, tr, linkrev,
  >                                 fparent1, fparent2)
  >             raise error.Abort('only merging is supported')
  >     repo.__class__ = legacyrepo
  > EOF

  $ cat > baz <<EOF
  > 1
  > 2
  > 3
  > 4
  > 5
  > EOF
  $ hg add baz
  $ hg commit -m "baz:0"

  $ cat > baz <<EOF
  > 1 baz:1
  > 2
  > 3
  > 4
  > 5
  > EOF
  $ hg commit -m "baz:1"

  $ cat > baz <<EOF
  > 1 baz:1
  > 2 baz:2
  > 3
  > 4
  > 5
  > EOF
  $ hg debugsetparents 17 17
  $ hg --config extensions.legacyrepo=../legacyrepo.py  commit -m "baz:2"
  $ hg debugindexdot baz
  digraph G {
  	-1 -> 0
  	0 -> 1
  	1 -> 2
  	1 -> 2
  }
  $ hg annotate baz
  17: 1 baz:1
  18: 2 baz:2
  16: 3
  16: 4
  16: 5

  $ cat > baz <<EOF
  > 1 baz:1
  > 2 baz:2
  > 3 baz:3
  > 4
  > 5
  > EOF
  $ hg commit -m "baz:3"

  $ cat > baz <<EOF
  > 1 baz:1
  > 2 baz:2
  > 3 baz:3
  > 4 baz:4
  > 5
  > EOF
  $ hg debugsetparents 19 18
  $ hg --config extensions.legacyrepo=../legacyrepo.py  commit -m "baz:4"
  $ hg debugindexdot baz
  digraph G {
  	-1 -> 0
  	0 -> 1
  	1 -> 2
  	1 -> 2
  	2 -> 3
  	3 -> 4
  	2 -> 4
  }
  $ hg annotate baz
  17: 1 baz:1
  18: 2 baz:2
  19: 3 baz:3
  20: 4 baz:4
  16: 5

annotate clean file

  $ hg annotate -ncr "wdir()" foo
  11 472b18db256d : foo

annotate modified file

  $ echo foofoo >> foo
  $ hg annotate -r "wdir()" foo
  11 : foo
  20+: foofoo

  $ hg annotate -cr "wdir()" foo
  472b18db256d : foo
  b6bedd5477e7+: foofoo

  $ hg annotate -ncr "wdir()" foo
  11 472b18db256d : foo
  20 b6bedd5477e7+: foofoo

  $ hg annotate --debug -ncr "wdir()" foo
  11 472b18db256d1e8282064eab4bfdaf48cbfe83cd : foo
  20 b6bedd5477e797f25e568a6402d4697f3f895a72+: foofoo

  $ hg annotate -udr "wdir()" foo
  test Thu Jan 01 00:00:00 1970 +0000: foo
  test [A-Za-z0-9:+ ]+: foofoo (re)

  $ hg annotate -ncr "wdir()" -Tjson foo
  [
   {
    "lines": [{"line": "foo\n", "node": "472b18db256d1e8282064eab4bfdaf48cbfe83cd", "rev": 11}, {"line": "foofoo\n", "node": "ffffffffffffffffffffffffffffffffffffffff", "rev": 2147483647}],
    "path": "foo"
   }
  ]

annotate added file

  $ echo bar > bar
  $ hg add bar
  $ hg annotate -ncr "wdir()" bar
  20 b6bedd5477e7+: bar

annotate renamed file

  $ hg rename foo renamefoo2
  $ hg annotate -ncr "wdir()" renamefoo2
  11 472b18db256d : foo
  20 b6bedd5477e7+: foofoo

annotate missing file

  $ rm baz

  $ hg annotate -ncr "wdir()" baz
  abort: $TESTTMP\repo\baz: $ENOENT$ (windows !)
  abort: $ENOENT$: '$TESTTMP/repo/baz' (no-windows !)
  [255]

annotate removed file

  $ hg rm baz

  $ hg annotate -ncr "wdir()" baz
  abort: $TESTTMP\repo\baz: $ENOENT$ (windows !)
  abort: $ENOENT$: '$TESTTMP/repo/baz' (no-windows !)
  [255]

  $ hg revert --all --no-backup --quiet
  $ hg id -n
  20

Test followlines() revset; we usually check both followlines(pat, range) and
followlines(pat, range, descend=True) to make sure both give the same result
when they should.

  $ echo a >> foo
  $ hg ci -m 'foo: add a'
  $ hg log -T '{rev}: {desc}\n' -r 'followlines(baz, 3:5)'
  16: baz:0
  19: baz:3
  20: baz:4
  $ hg log -T '{rev}: {desc}\n' -r 'followlines(baz, 3:5, startrev=20)'
  16: baz:0
  19: baz:3
  20: baz:4
  $ hg log -T '{rev}: {desc}\n' -r 'followlines(baz, 3:5, startrev=19)'
  16: baz:0
  19: baz:3
  $ hg log -T '{rev}: {desc}\n' -r 'followlines(baz, 3:5, startrev=19, descend=True)'
  19: baz:3
  20: baz:4
  $ printf "0\n0\n" | cat - baz > baz1
  $ mv baz1 baz
  $ hg ci -m 'added two lines with 0'
  $ hg log -T '{rev}: {desc}\n' -r 'followlines(baz, 5:7)'
  16: baz:0
  19: baz:3
  20: baz:4
  $ hg log -T '{rev}: {desc}\n' -r 'followlines(baz, 3:5, descend=true, startrev=19)'
  19: baz:3
  20: baz:4
  $ echo 6 >> baz
  $ hg ci -m 'added line 8'
  $ hg log -T '{rev}: {desc}\n' -r 'followlines(baz, 5:7)'
  16: baz:0
  19: baz:3
  20: baz:4
  $ hg log -T '{rev}: {desc}\n' -r 'followlines(baz, 3:5, startrev=19, descend=1)'
  19: baz:3
  20: baz:4
  $ sed 's/3/3+/' baz > baz.new
  $ mv baz.new baz
  $ hg ci -m 'baz:3->3+'
  $ hg log -T '{rev}: {desc}\n' -r 'followlines(baz, 5:7, descend=0)'
  16: baz:0
  19: baz:3
  20: baz:4
  24: baz:3->3+
  $ hg log -T '{rev}: {desc}\n' -r 'followlines(baz, 3:5, startrev=17, descend=True)'
  19: baz:3
  20: baz:4
  24: baz:3->3+
  $ hg log -T '{rev}: {desc}\n' -r 'followlines(baz, 1:2, descend=false)'
  22: added two lines with 0

file patterns are okay
  $ hg log -T '{rev}: {desc}\n' -r 'followlines("path:baz", 1:2)'
  22: added two lines with 0

renames are followed
  $ hg mv baz qux
  $ sed 's/4/4+/' qux > qux.new
  $ mv qux.new qux
  $ hg ci -m 'qux:4->4+'
  $ hg log -T '{rev}: {desc}\n' -r 'followlines(qux, 5:7)'
  16: baz:0
  19: baz:3
  20: baz:4
  24: baz:3->3+
  25: qux:4->4+

but are missed when following children
  $ hg log -T '{rev}: {desc}\n' -r 'followlines(baz, 5:7, startrev=22, descend=True)'
  24: baz:3->3+

merge
  $ hg up 24 --quiet
  $ echo 7 >> baz
  $ hg ci -m 'one more line, out of line range'
  created new head
  $ sed 's/3+/3-/' baz > baz.new
  $ mv baz.new baz
  $ hg ci -m 'baz:3+->3-'
  $ hg log -T '{rev}: {desc}\n' -r 'followlines(baz, 5:7)'
  16: baz:0
  19: baz:3
  20: baz:4
  24: baz:3->3+
  27: baz:3+->3-
  $ hg merge 25
  merging baz and qux to qux
  warning: conflicts while merging qux! (edit, then use 'hg resolve --mark')
  0 files updated, 0 files merged, 0 files removed, 1 files unresolved
  use 'hg resolve' to retry unresolved file merges or 'hg merge --abort' to abandon
  [1]
  $ cat qux
  0
  0
  1 baz:1
  2 baz:2
  <<<<<<< working copy: 863de62655ef - test: baz:3+->3-
  3- baz:3
  4 baz:4
  ||||||| base
  3+ baz:3
  4 baz:4
  =======
  3+ baz:3
  4+ baz:4
  >>>>>>> merge rev:    cb8df70ae185 - test: qux:4->4+
  5
  6
  7
  $ cat > qux <<EOF
  > 0
  > 0
  > 1 baz:1
  > 2 baz:2
  > 3- baz:3
  > 4 baz:4
  > 5
  > 6
  > 7
  > EOF
  $ hg resolve --mark -q
  $ rm qux.orig
  $ hg ci -m merge
  $ hg log -T '{rev}: {desc}\n' -r 'followlines(qux, 5:7)'
  16: baz:0
  19: baz:3
  20: baz:4
  24: baz:3->3+
  25: qux:4->4+
  27: baz:3+->3-
  28: merge
  $ hg up 25 --quiet
  $ hg merge 27
  merging qux and baz to qux
  warning: conflicts while merging qux! (edit, then use 'hg resolve --mark')
  0 files updated, 0 files merged, 0 files removed, 1 files unresolved
  use 'hg resolve' to retry unresolved file merges or 'hg merge --abort' to abandon
  [1]
  $ cat qux
  0
  0
  1 baz:1
  2 baz:2
  <<<<<<< working copy: cb8df70ae185 - test: qux:4->4+
  3+ baz:3
  4+ baz:4
  ||||||| base
  3+ baz:3
  4 baz:4
  =======
  3- baz:3
  4 baz:4
  >>>>>>> merge rev:    863de62655ef - test: baz:3+->3-
  5
  6
  7
  $ cat > qux <<EOF
  > 0
  > 0
  > 1 baz:1
  > 2 baz:2
  > 3+ baz:3
  > 4+ baz:4
  > 5
  > 6
  > EOF
  $ hg resolve --mark -q
  $ rm qux.orig
  $ hg ci -m 'merge from other side'
  created new head
  $ hg log -T '{rev}: {desc}\n' -r 'followlines(qux, 5:7)'
  16: baz:0
  19: baz:3
  20: baz:4
  24: baz:3->3+
  25: qux:4->4+
  27: baz:3+->3-
  29: merge from other side
  $ hg up 24 --quiet

we are missing the branch with rename when following children
  $ hg log -T '{rev}: {desc}\n' -r 'followlines(baz, 5:7, startrev=26, descend=True)'
  27: baz:3+->3-

we follow all branches in descending direction
  $ hg up 23 --quiet
  $ sed 's/3/+3/' baz > baz.new
  $ mv baz.new baz
  $ hg ci -m 'baz:3->+3'
  created new head
  $ hg log -T '{rev}: {desc}\n' -r 'followlines(baz, 2:5, startrev=16, descend=True)' --graph
  @  30: baz:3->+3
  :
  : o  27: baz:3+->3-
  : :
  : o  24: baz:3->3+
  :/
  o    20: baz:4
  |\
  | o  19: baz:3
  |/
  o  18: baz:2
  :
  o  16: baz:0
  |
  ~

Issue5595: on a merge changeset with different line ranges depending on
parent, be conservative and use the surrounding interval to avoid loosing
track of possible further descendants in specified range.

  $ hg up 23 --quiet
  $ hg cat baz -r 24
  0
  0
  1 baz:1
  2 baz:2
  3+ baz:3
  4 baz:4
  5
  6
  $ cat > baz << EOF
  > 0
  > 0
  > a
  > b
  > 3+ baz:3
  > 4 baz:4
  > y
  > z
  > EOF
  $ hg ci -m 'baz: mostly rewrite with some content from 24'
  created new head
  $ hg merge --tool :merge-other 24
  merging baz
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  (branch merge, don't forget to commit)
  $ hg ci -m 'merge forgetting about baz rewrite'
  $ cat > baz << EOF
  > 0
  > 0
  > 1 baz:1
  > 2+ baz:2
  > 3+ baz:3
  > 4 baz:4
  > 5
  > 6
  > EOF
  $ hg ci -m 'baz: narrow change (2->2+)'
  $ hg log -T '{rev}: {desc}\n' -r 'followlines(baz, 3:4, startrev=20, descend=True)' --graph
  @  33: baz: narrow change (2->2+)
  |
  o    32: merge forgetting about baz rewrite
  |\
  | o  31: baz: mostly rewrite with some content from 24
  | :
  | : o  30: baz:3->+3
  | :/
  +---o  27: baz:3+->3-
  | :
  o :  24: baz:3->3+
  :/
  o    20: baz:4
  |\
  ~ ~

An integer as a line range, which is parsed as '1:1'

  $ hg log -r 'followlines(baz, 1)'
  changeset:   22:2174d0bf352a
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     added two lines with 0
  

check error cases
  $ hg up 24 --quiet
  $ hg log -r 'followlines()'
  hg: parse error: followlines takes at least 1 positional arguments
  [255]
  $ hg log -r 'followlines(baz)'
  hg: parse error: followlines requires a line range
  [255]
  $ hg log -r 'followlines(baz, x)'
  hg: parse error: followlines expects a line number or a range
  [255]
  $ hg log -r 'followlines(baz, 1:2, startrev=desc("b"))'
  hg: parse error: followlines expects exactly one revision
  [255]
  $ hg log -r 'followlines("glob:*", 1:2)'
  hg: parse error: followlines expects exactly one file
  [255]
  $ hg log -r 'followlines(baz, 1:)'
  hg: parse error: line range bounds must be integers
  [255]
  $ hg log -r 'followlines(baz, :1)'
  hg: parse error: line range bounds must be integers
  [255]
  $ hg log -r 'followlines(baz, x:4)'
  hg: parse error: line range bounds must be integers
  [255]
  $ hg log -r 'followlines(baz, 5:4)'
  hg: parse error: line range must be positive
  [255]
  $ hg log -r 'followlines(baz, 0:4)'
  hg: parse error: fromline must be strictly positive
  [255]
  $ hg log -r 'followlines(baz, 2:40)'
  abort: line range exceeds file size
  [255]
  $ hg log -r 'followlines(baz, 2:4, startrev=20, descend=[1])'
  hg: parse error at 43: not a prefix: [
  (followlines(baz, 2:4, startrev=20, descend=[1])
                                              ^ here)
  [255]
  $ hg log -r 'followlines(baz, 2:4, startrev=20, descend=a)'
  hg: parse error: descend argument must be a boolean
  [255]

Test empty annotate output

  $ printf '\0' > binary
  $ touch empty
  $ hg ci -qAm 'add binary and empty files'

  $ hg annotate binary empty
  binary: binary file

  $ hg annotate -Tjson binary empty
  [
   {
    "path": "binary"
   },
   {
    "lines": [],
    "path": "empty"
   }
  ]

Test annotate with whitespace options

  $ cd ..
  $ hg init repo-ws
  $ cd repo-ws
  $ cat > a <<EOF
  > aa
  > 
  > b b
  > EOF
  $ hg ci -Am "adda"
  adding a
  $ sed 's/EOL$//g' > a <<EOF
  > a  a
  > 
  >  EOL
  > b  b
  > EOF
  $ hg ci -m "changea"

Annotate with no option

  $ hg annotate a
  1: a  a
  0: 
  1:  
  1: b  b

Annotate with --ignore-space-change

  $ hg annotate --ignore-space-change a
  1: a  a
  1: 
  0:  
  0: b  b

Annotate with --ignore-all-space

  $ hg annotate --ignore-all-space a
  0: a  a
  0: 
  1:  
  0: b  b

Annotate with --ignore-blank-lines (similar to no options case)

  $ hg annotate --ignore-blank-lines a
  1: a  a
  0: 
  1:  
  1: b  b

  $ cd ..

Annotate with orphaned CR (issue5798)
-------------------------------------

  $ hg init repo-cr
  $ cd repo-cr

  $ cat <<'EOF' >> "$TESTTMP/substcr.py"
  > import sys
  > from mercurial.utils import procutil
  > procutil.setbinary(sys.stdin)
  > procutil.setbinary(sys.stdout)
  > stdin = getattr(sys.stdin, 'buffer', sys.stdin)
  > stdout = getattr(sys.stdout, 'buffer', sys.stdout)
  > stdout.write(stdin.read().replace(b'\r', b'[CR]'))
  > EOF

  >>> with open('a', 'wb') as f:
  ...     f.write(b'0a\r0b\r\n0c\r0d\r\n0e\n0f\n0g') and None
  $ hg ci -qAm0
  >>> with open('a', 'wb') as f:
  ...     f.write(b'0a\r0b\r\n1c\r1d\r\n0e\n1f\n0g') and None
  $ hg ci -m1

  $ hg annotate -r0 a | "$PYTHON" "$TESTTMP/substcr.py"
  0: 0a[CR]0b[CR]
  0: 0c[CR]0d[CR]
  0: 0e
  0: 0f
  0: 0g
  $ hg annotate -r1 a | "$PYTHON" "$TESTTMP/substcr.py"
  0: 0a[CR]0b[CR]
  1: 1c[CR]1d[CR]
  0: 0e
  1: 1f
  0: 0g

  $ cd ..

Annotate with linkrev pointing to another branch
------------------------------------------------

create history with a filerev whose linkrev points to another branch

  $ hg init branchedlinkrev
  $ cd branchedlinkrev
  $ echo A > a
  $ hg commit -Am 'contentA'
  adding a
  $ echo B >> a
  $ hg commit -m 'contentB'
  $ hg up --rev 'desc(contentA)'
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ echo unrelated > unrelated
  $ hg commit -Am 'unrelated'
  adding unrelated
  created new head
  $ hg graft -r 'desc(contentB)'
  grafting 1:fd27c222e3e6 "contentB"
  $ echo C >> a
  $ hg commit -m 'contentC'
  $ echo W >> a
  $ hg log -G
  @  changeset:   4:072f1e8df249
  |  tag:         tip
  |  user:        test
  |  date:        Thu Jan 01 00:00:00 1970 +0000
  |  summary:     contentC
  |
  o  changeset:   3:ff38df03cc4b
  |  user:        test
  |  date:        Thu Jan 01 00:00:00 1970 +0000
  |  summary:     contentB
  |
  o  changeset:   2:62aaf3f6fc06
  |  parent:      0:f0932f74827e
  |  user:        test
  |  date:        Thu Jan 01 00:00:00 1970 +0000
  |  summary:     unrelated
  |
  | o  changeset:   1:fd27c222e3e6
  |/   user:        test
  |    date:        Thu Jan 01 00:00:00 1970 +0000
  |    summary:     contentB
  |
  o  changeset:   0:f0932f74827e
     user:        test
     date:        Thu Jan 01 00:00:00 1970 +0000
     summary:     contentA
  

Annotate should list ancestor of starting revision only

  $ hg annotate a
  0: A
  3: B
  4: C

  $ hg annotate a -r 'wdir()'
  0 : A
  3 : B
  4 : C
  4+: W

Even when the starting revision is the linkrev-shadowed one:

  $ hg annotate a -r 3
  0: A
  3: B

  $ cd ..

Issue5360: Deleted chunk in p1 of a merge changeset

  $ hg init repo-5360
  $ cd repo-5360
  $ echo 1 > a
  $ hg commit -A a -m 1
  $ echo 2 >> a
  $ hg commit -m 2
  $ echo a > a
  $ hg commit -m a
  $ hg update '.^' -q
  $ echo 3 >> a
  $ hg commit -m 3 -q
  $ hg merge 2 -q
  warning: conflicts while merging a! (edit, then use 'hg resolve --mark')
  [1]
  $ cat a
  <<<<<<< working copy: 0a068f0261cf - test: 3
  1
  2
  3
  ||||||| base
  1
  2
  =======
  a
  >>>>>>> merge rev:    9409851bc20a - test: a
  $ cat > a << EOF
  > b
  > 1
  > 2
  > 3
  > a
  > EOF
  $ hg resolve --mark -q
  $ rm a.orig
  $ hg commit -m m
  $ hg annotate a
  4: b
  0: 1
  1: 2
  3: 3
  2: a

  $ cd ..