view tests/test-log-linerange.t @ 44118:f81c17ec303c

hgdemandimport: apply lazy module loading to sys.meta_path finders

Python's `sys.meta_path` finders are the primary objects whose job it
is to find a module at import time. When `import` is called, Python
iterates objects in this list and calls `o.find_spec(...)` to find
a `ModuleSpec` (or None if the module couldn't be found by that
finder). If no meta path finder can find a module, import fails.

One of the default meta path finders is `PathFinder`. Its job is to
import modules from the filesystem and is probably the most important
importer. This finder looks at `sys.path` and `sys.path_hooks` to do
its job.

The `ModuleSpec` returned by `MetaPathImporter.find_spec()` has a
`loader` attribute, which defines the concrete module loader to use.
`sys.path_hooks` is a hook point for teaching `PathFinder` to
instantiate custom loader types.

Previously, we injected a custom `sys.path_hook` that told `PathFinder`
to wrap the default loaders with a loader that creates a module object
that is lazy.

This approach worked. But its main limitation was that it only applied
to the `PathFinder` meta path importer. There are other meta path
importers that are registered. And in the case of PyOxidizer loading
modules from memory, `PathFinder` doesn't come into play since
PyOxidizer's own meta path importer was handling all imports.

This commit changes our approach to lazy module loading by proxying
all meta path importers. Specifically, we overload the `find_spec()`
method to swap in a wrapped loader on the `ModuleSpec` before it
is returned. The end result of this is all meta path importers should
be lazy.

As much as I would have loved to utilize .__class__ manipulation to
achieve this, some meta path importers are implemented in C/Rust
in such a way that they cannot be monkeypatched. This is why we
use __getattribute__ to define a proxy.

Also, this change could theoretically open us up to regressions in
meta path importers whose loader is creating module objects which
can't be monkeypatched. But I'm not aware of any of these in the
wild. So I think we'll be safe.

According to hyperfine, this change yields a decent startup time win of
5-6ms:

```
Benchmark #1: ~/.pyenv/versions/3.6.10/bin/python ./hg version
  Time (mean ± σ):      86.8 ms ±   0.5 ms    [User: 78.0 ms, System: 8.7 ms]
  Range (min … max):    86.0 ms …  89.1 ms    50 runs

  Time (mean ± σ):      81.1 ms ±   2.7 ms    [User: 74.5 ms, System: 6.5 ms]
  Range (min … max):    77.8 ms …  90.5 ms    50 runs

Benchmark #2: ~/.pyenv/versions/3.7.6/bin/python ./hg version
  Time (mean ± σ):      78.9 ms ±   0.6 ms    [User: 70.2 ms, System: 8.7 ms]
  Range (min … max):    78.1 ms …  81.2 ms    50 runs

  Time (mean ± σ):      73.4 ms ±   0.6 ms    [User: 65.3 ms, System: 8.0 ms]
  Range (min … max):    72.4 ms …  75.7 ms    50 runs

Benchmark #3: ~/.pyenv/versions/3.8.1/bin/python ./hg version
  Time (mean ± σ):      78.1 ms ±   0.6 ms    [User: 70.2 ms, System: 7.9 ms]
  Range (min … max):    77.4 ms …  80.9 ms    50 runs

  Time (mean ± σ):      72.1 ms ±   0.4 ms    [User: 64.4 ms, System: 7.6 ms]
  Range (min … max):    71.4 ms …  74.1 ms    50 runs
```

Differential Revision: https://phab.mercurial-scm.org/D7954

  $ cat >> $HGRCPATH << EOF
  > [diff]
  > git = true
  > EOF

  $ hg init
  $ cat > foo << EOF
  > 0
  > 1
  > 2
  > 3
  > 4
  > EOF
  $ hg ci -Am init
  adding foo
  $ cat > foo << EOF
  > 0
  > 0
  > 0
  > 0
  > 1
  > 2
  > 3
  > 4
  > EOF
  $ hg ci -m 'more 0'
  $ sed 's/2/2+/' foo > foo.new
  $ mv foo.new foo
  $ cat > bar << EOF
  > a
  > b
  > c
  > d
  > e
  > EOF
  $ hg add bar
  $ hg ci -Am "2 -> 2+; added bar"
  $ cat >> foo << EOF
  > 5
  > 6
  > 7
  > 8
  > 9
  > 10
  > 11
  > EOF
  $ hg ci -m "to 11"

Add some changes with two diff hunks

  $ sed 's/^1$/ 1/' foo > foo.new
  $ mv foo.new foo
  $ sed 's/^11$/11+/' foo > foo.new
  $ mv foo.new foo
  $ hg ci -m '11 -> 11+; leading space before "1"'
(make sure there are two hunks in "foo")
  $ hg diff -c .
  diff --git a/foo b/foo
  --- a/foo
  +++ b/foo
  @@ -2,7 +2,7 @@
   0
   0
   0
  -1
  + 1
   2+
   3
   4
  @@ -12,4 +12,4 @@
   8
   9
   10
  -11
  +11+
  $ sed 's/3/3+/' foo > foo.new
  $ mv foo.new foo
  $ sed 's/^11+$/11-/' foo > foo.new
  $ mv foo.new foo
  $ sed 's/a/a+/' bar > bar.new
  $ mv bar.new bar
  $ hg ci -m 'foo: 3 -> 3+ and 11+ -> 11-; bar: a -> a+'
(make sure there are two hunks in "foo")
  $ hg diff -c . foo
  diff --git a/foo b/foo
  --- a/foo
  +++ b/foo
  @@ -4,7 +4,7 @@
   0
    1
   2+
  -3
  +3+
   4
   5
   6
  @@ -12,4 +12,4 @@
   8
   9
   10
  -11+
  +11-

  $ hg log -f -L foo,5:7 -p
  changeset:   5:cfdf972b3971
  tag:         tip
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     foo: 3 -> 3+ and 11+ -> 11-; bar: a -> a+
  
  diff --git a/foo b/foo
  --- a/foo
  +++ b/foo
  @@ -4,7 +4,7 @@
   0
    1
   2+
  -3
  +3+
   4
   5
   6
  
  changeset:   4:eaec41c1a0c9
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     11 -> 11+; leading space before "1"
  
  diff --git a/foo b/foo
  --- a/foo
  +++ b/foo
  @@ -2,7 +2,7 @@
   0
   0
   0
  -1
  + 1
   2+
   3
   4
  
  changeset:   2:63a884426fd0
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     2 -> 2+; added bar
  
  diff --git a/foo b/foo
  --- a/foo
  +++ b/foo
  @@ -3,6 +3,6 @@
   0
   0
   1
  -2
  +2+
   3
   4
  
  changeset:   0:5ae1f82b9a00
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     init
  
  diff --git a/foo b/foo
  new file mode 100644
  --- /dev/null
  +++ b/foo
  @@ -0,0 +1,5 @@
  +0
  +1
  +2
  +3
  +4
  
  $ hg log -f --graph -L foo,5:7 -p
  @  changeset:   5:cfdf972b3971
  |  tag:         tip
  |  user:        test
  |  date:        Thu Jan 01 00:00:00 1970 +0000
  |  summary:     foo: 3 -> 3+ and 11+ -> 11-; bar: a -> a+
  |
  |  diff --git a/foo b/foo
  |  --- a/foo
  |  +++ b/foo
  |  @@ -4,7 +4,7 @@
  |   0
  |    1
  |   2+
  |  -3
  |  +3+
  |   4
  |   5
  |   6
  |
  o  changeset:   4:eaec41c1a0c9
  :  user:        test
  :  date:        Thu Jan 01 00:00:00 1970 +0000
  :  summary:     11 -> 11+; leading space before "1"
  :
  :  diff --git a/foo b/foo
  :  --- a/foo
  :  +++ b/foo
  :  @@ -2,7 +2,7 @@
  :   0
  :   0
  :   0
  :  -1
  :  + 1
  :   2+
  :   3
  :   4
  :
  o  changeset:   2:63a884426fd0
  :  user:        test
  :  date:        Thu Jan 01 00:00:00 1970 +0000
  :  summary:     2 -> 2+; added bar
  :
  :  diff --git a/foo b/foo
  :  --- a/foo
  :  +++ b/foo
  :  @@ -3,6 +3,6 @@
  :   0
  :   0
  :   1
  :  -2
  :  +2+
  :   3
  :   4
  :
  o  changeset:   0:5ae1f82b9a00
     user:        test
     date:        Thu Jan 01 00:00:00 1970 +0000
     summary:     init
  
     diff --git a/foo b/foo
     new file mode 100644
     --- /dev/null
     +++ b/foo
     @@ -0,0 +1,5 @@
     +0
     +1
     +2
     +3
     +4
  

With --template.

  $ hg log -f -L foo,5:7 -T '{rev}:{node|short} {desc|firstline}\n'
  5:cfdf972b3971 foo: 3 -> 3+ and 11+ -> 11-; bar: a -> a+
  4:eaec41c1a0c9 11 -> 11+; leading space before "1"
  2:63a884426fd0 2 -> 2+; added bar
  0:5ae1f82b9a00 init
  $ hg log -f -L foo,5:7 -T json
  [
   {
    "bookmarks": [],
    "branch": "default",
    "date": [0, 0],
    "desc": "foo: 3 -> 3+ and 11+ -> 11-; bar: a -> a+",
    "node": "cfdf972b3971a2a59638bf9583c0debbffee5404",
    "parents": ["eaec41c1a0c9ad0a5e999611d0149d171beffb8c"],
    "phase": "draft",
    "rev": 5,
    "tags": ["tip"],
    "user": "test"
   },
   {
    "bookmarks": [],
    "branch": "default",
    "date": [0, 0],
    "desc": "11 -> 11+; leading space before \"1\"",
    "node": "eaec41c1a0c9ad0a5e999611d0149d171beffb8c",
    "parents": ["730a61fbaecf426c17c2c66bc42d195b5d5b0ba8"],
    "phase": "draft",
    "rev": 4,
    "tags": [],
    "user": "test"
   },
   {
    "bookmarks": [],
    "branch": "default",
    "date": [0, 0],
    "desc": "2 -> 2+; added bar",
    "node": "63a884426fd0b277fcd55895bbb2f230434576eb",
    "parents": ["29a1e7c6b80024f63f310a2d71de979e9d2996d7"],
    "phase": "draft",
    "rev": 2,
    "tags": [],
    "user": "test"
   },
   {
    "bookmarks": [],
    "branch": "default",
    "date": [0, 0],
    "desc": "init",
    "node": "5ae1f82b9a000ff1e0967d0dac1c58b9d796e1b4",
    "parents": ["0000000000000000000000000000000000000000"],
    "phase": "draft",
    "rev": 0,
    "tags": [],
    "user": "test"
   }
  ]

With some white-space diff option, respective revisions are skipped.

  $ hg log -f -L foo,5:7 -p --config diff.ignorews=true
  changeset:   5:cfdf972b3971
  tag:         tip
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     foo: 3 -> 3+ and 11+ -> 11-; bar: a -> a+
  
  diff --git a/foo b/foo
  --- a/foo
  +++ b/foo
  @@ -4,7 +4,7 @@
   0
    1
   2+
  -3
  +3+
   4
   5
   6
  
  changeset:   2:63a884426fd0
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     2 -> 2+; added bar
  
  diff --git a/foo b/foo
  --- a/foo
  +++ b/foo
  @@ -3,6 +3,6 @@
   0
   0
   1
  -2
  +2+
   3
   4
  
  changeset:   0:5ae1f82b9a00
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     init
  
  diff --git a/foo b/foo
  new file mode 100644
  --- /dev/null
  +++ b/foo
  @@ -0,0 +1,5 @@
  +0
  +1
  +2
  +3
  +4
  

Regular file patterns are not allowed.

  $ hg log -f -L foo,5:7 -p bar
  abort: FILE arguments are not compatible with --line-range option
  [255]

Option --rev acts as a restriction.

  $ hg log -f -L foo,5:7 -p -r 'desc(2)'
  changeset:   2:63a884426fd0
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     2 -> 2+; added bar
  
  diff --git a/foo b/foo
  --- a/foo
  +++ b/foo
  @@ -3,6 +3,6 @@
   0
   0
   1
  -2
  +2+
   3
   4
  
  changeset:   0:5ae1f82b9a00
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     init
  
  diff --git a/foo b/foo
  new file mode 100644
  --- /dev/null
  +++ b/foo
  @@ -0,0 +1,5 @@
  +0
  +1
  +2
  +3
  +4
  

With several -L patterns, changes touching any files in their respective line
range are show.

  $ hg log -f -L foo,5:7 -L bar,1:2 -p
  changeset:   5:cfdf972b3971
  tag:         tip
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     foo: 3 -> 3+ and 11+ -> 11-; bar: a -> a+
  
  diff --git a/bar b/bar
  --- a/bar
  +++ b/bar
  @@ -1,4 +1,4 @@
  -a
  +a+
   b
   c
   d
  diff --git a/foo b/foo
  --- a/foo
  +++ b/foo
  @@ -4,7 +4,7 @@
   0
    1
   2+
  -3
  +3+
   4
   5
   6
  
  changeset:   4:eaec41c1a0c9
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     11 -> 11+; leading space before "1"
  
  diff --git a/foo b/foo
  --- a/foo
  +++ b/foo
  @@ -2,7 +2,7 @@
   0
   0
   0
  -1
  + 1
   2+
   3
   4
  
  changeset:   2:63a884426fd0
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     2 -> 2+; added bar
  
  diff --git a/bar b/bar
  new file mode 100644
  --- /dev/null
  +++ b/bar
  @@ -0,0 +1,5 @@
  +a
  +b
  +c
  +d
  +e
  diff --git a/foo b/foo
  --- a/foo
  +++ b/foo
  @@ -3,6 +3,6 @@
   0
   0
   1
  -2
  +2+
   3
   4
  
  changeset:   0:5ae1f82b9a00
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     init
  
  diff --git a/foo b/foo
  new file mode 100644
  --- /dev/null
  +++ b/foo
  @@ -0,0 +1,5 @@
  +0
  +1
  +2
  +3
  +4
  

Multiple -L options with the same file yields changes touching any of
specified line ranges.

  $ hg log -f -L foo,5:7 -L foo,14:15 -p
  changeset:   5:cfdf972b3971
  tag:         tip
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     foo: 3 -> 3+ and 11+ -> 11-; bar: a -> a+
  
  diff --git a/foo b/foo
  --- a/foo
  +++ b/foo
  @@ -4,7 +4,7 @@
   0
    1
   2+
  -3
  +3+
   4
   5
   6
  @@ -12,4 +12,4 @@
   8
   9
   10
  -11+
  +11-
  
  changeset:   4:eaec41c1a0c9
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     11 -> 11+; leading space before "1"
  
  diff --git a/foo b/foo
  --- a/foo
  +++ b/foo
  @@ -2,7 +2,7 @@
   0
   0
   0
  -1
  + 1
   2+
   3
   4
  @@ -12,4 +12,4 @@
   8
   9
   10
  -11
  +11+
  
  changeset:   3:730a61fbaecf
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     to 11
  
  diff --git a/foo b/foo
  --- a/foo
  +++ b/foo
  @@ -6,3 +6,10 @@
   2+
   3
   4
  +5
  +6
  +7
  +8
  +9
  +10
  +11
  
  changeset:   2:63a884426fd0
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     2 -> 2+; added bar
  
  diff --git a/foo b/foo
  --- a/foo
  +++ b/foo
  @@ -3,6 +3,6 @@
   0
   0
   1
  -2
  +2+
   3
   4
  
  changeset:   0:5ae1f82b9a00
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     init
  
  diff --git a/foo b/foo
  new file mode 100644
  --- /dev/null
  +++ b/foo
  @@ -0,0 +1,5 @@
  +0
  +1
  +2
  +3
  +4
  

A file with a comma in its name.

  $ cat > ba,z << EOF
  > q
  > w
  > e
  > r
  > t
  > y
  > EOF
  $ hg ci -Am 'querty'
  adding ba,z
  $ cat >> ba,z << EOF
  > u
  > i
  > o
  > p
  > EOF
  $ hg ci -m 'more keys'
  $ cat > ba,z << EOF
  > a
  > z
  > e
  > r
  > t
  > y
  > u
  > i
  > o
  > p
  > EOF
  $ hg ci -m 'azerty'
  $ hg log -f -L ba,z,1:2 -p
  changeset:   8:52373265138b
  tag:         tip
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     azerty
  
  diff --git a/ba,z b/ba,z
  --- a/ba,z
  +++ b/ba,z
  @@ -1,5 +1,5 @@
  -q
  -w
  +a
  +z
   e
   r
   t
  
  changeset:   6:96ba8850f316
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     querty
  
  diff --git a/ba,z b/ba,z
  new file mode 100644
  --- /dev/null
  +++ b/ba,z
  @@ -0,0 +1,6 @@
  +q
  +w
  +e
  +r
  +t
  +y
  

Exact prefix kinds work in -L options.

  $ mkdir dir
  $ cd dir
  $ hg log -f -L path:foo,5:7 -p
  changeset:   5:cfdf972b3971
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     foo: 3 -> 3+ and 11+ -> 11-; bar: a -> a+
  
  diff --git a/foo b/foo
  --- a/foo
  +++ b/foo
  @@ -4,7 +4,7 @@
   0
    1
   2+
  -3
  +3+
   4
   5
   6
  
  changeset:   4:eaec41c1a0c9
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     11 -> 11+; leading space before "1"
  
  diff --git a/foo b/foo
  --- a/foo
  +++ b/foo
  @@ -2,7 +2,7 @@
   0
   0
   0
  -1
  + 1
   2+
   3
   4
  
  changeset:   2:63a884426fd0
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     2 -> 2+; added bar
  
  diff --git a/foo b/foo
  --- a/foo
  +++ b/foo
  @@ -3,6 +3,6 @@
   0
   0
   1
  -2
  +2+
   3
   4
  
  changeset:   0:5ae1f82b9a00
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     init
  
  diff --git a/foo b/foo
  new file mode 100644
  --- /dev/null
  +++ b/foo
  @@ -0,0 +1,5 @@
  +0
  +1
  +2
  +3
  +4
  

Renames are followed.

  $ hg mv ../foo baz
  $ sed 's/1/1+/' baz > baz.new
  $ mv baz.new baz
  $ hg ci -m 'foo -> dir/baz; 1-1+'
  $ hg diff -c .
  diff --git a/foo b/dir/baz
  rename from foo
  rename to dir/baz
  --- a/foo
  +++ b/dir/baz
  @@ -2,7 +2,7 @@
   0
   0
   0
  - 1
  + 1+
   2+
   3+
   4
  @@ -11,5 +11,5 @@
   7
   8
   9
  -10
  -11-
  +1+0
  +1+1-
  $ hg log -f -L relpath:baz,5:7 -p
  changeset:   9:6af29c3a778f
  tag:         tip
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     foo -> dir/baz; 1-1+
  
  diff --git a/foo b/dir/baz
  copy from foo
  copy to dir/baz
  --- a/foo
  +++ b/dir/baz
  @@ -2,7 +2,7 @@
   0
   0
   0
  - 1
  + 1+
   2+
   3+
   4
  
  changeset:   5:cfdf972b3971
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     foo: 3 -> 3+ and 11+ -> 11-; bar: a -> a+
  
  diff --git a/foo b/foo
  --- a/foo
  +++ b/foo
  @@ -4,7 +4,7 @@
   0
    1
   2+
  -3
  +3+
   4
   5
   6
  
  changeset:   4:eaec41c1a0c9
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     11 -> 11+; leading space before "1"
  
  diff --git a/foo b/foo
  --- a/foo
  +++ b/foo
  @@ -2,7 +2,7 @@
   0
   0
   0
  -1
  + 1
   2+
   3
   4
  
  changeset:   2:63a884426fd0
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     2 -> 2+; added bar
  
  diff --git a/foo b/foo
  --- a/foo
  +++ b/foo
  @@ -3,6 +3,6 @@
   0
   0
   1
  -2
  +2+
   3
   4
  
  changeset:   0:5ae1f82b9a00
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     init
  
  diff --git a/foo b/foo
  new file mode 100644
  --- /dev/null
  +++ b/foo
  @@ -0,0 +1,5 @@
  +0
  +1
  +2
  +3
  +4
  

Uncommitted changes with a rename

  $ hg mv baz bazn
  $ hg log -f -L bazn,5:7
  changeset:   9:6af29c3a778f
  tag:         tip
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     foo -> dir/baz; 1-1+
  
  changeset:   5:cfdf972b3971
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     foo: 3 -> 3+ and 11+ -> 11-; bar: a -> a+
  
  changeset:   4:eaec41c1a0c9
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     11 -> 11+; leading space before "1"
  
  changeset:   2:63a884426fd0
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     2 -> 2+; added bar
  
  changeset:   0:5ae1f82b9a00
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     init
  

Uncommitted changes in requested line range

  $ sed 's/2/  /' bazn > bazn.new
  $ mv bazn.new bazn
  $ hg diff
  diff --git a/dir/baz b/dir/bazn
  rename from dir/baz
  rename to dir/bazn
  --- a/dir/baz
  +++ b/dir/bazn
  @@ -3,7 +3,7 @@
   0
   0
    1+
  -2+
  +  +
   3+
   4
   5
  $ hg log -f -L bazn,5:7
  changeset:   9:6af29c3a778f
  tag:         tip
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     foo -> dir/baz; 1-1+
  
  changeset:   5:cfdf972b3971
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     foo: 3 -> 3+ and 11+ -> 11-; bar: a -> a+
  
  changeset:   4:eaec41c1a0c9
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     11 -> 11+; leading space before "1"
  
  changeset:   2:63a884426fd0
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     2 -> 2+; added bar
  
  changeset:   0:5ae1f82b9a00
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     init
  

Uncommitted changes in line-range + wdir()

  $ hg log -r 'wdir()' -f -L bazn,5:7 --limit 2 -p
  changeset:   2147483647:ffffffffffff
  parent:      9:6af29c3a778f
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  
  diff --git a/dir/baz b/dir/bazn
  copy from dir/baz
  copy to dir/bazn
  --- a/dir/baz
  +++ b/dir/bazn
  @@ -3,7 +3,7 @@
   0
   0
    1+
  -2+
  +  +
   3+
   4
   5
  
  changeset:   9:6af29c3a778f
  tag:         tip
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     foo -> dir/baz; 1-1+
  
  diff --git a/foo b/dir/baz
  copy from foo
  copy to dir/baz
  --- a/foo
  +++ b/dir/baz
  @@ -2,7 +2,7 @@
   0
   0
   0
  - 1
  + 1+
   2+
   3+
   4
  

  $ hg revert -a -C -q

Copies.

  $ hg copy baz bbaz
  $ sed 's/6/6+/' bbaz > bbaz.new
  $ mv bbaz.new bbaz
  $ hg commit -m 'cp baz bbaz; 6-6+'
  $ hg diff -c .
  diff --git a/dir/baz b/dir/bbaz
  copy from dir/baz
  copy to dir/bbaz
  --- a/dir/baz
  +++ b/dir/bbaz
  @@ -7,7 +7,7 @@
   3+
   4
   5
  -6
  +6+
   7
   8
   9
  $ hg log --copies -f -L bbaz,10:11 -p
  changeset:   10:91a3d3b6c546
  tag:         tip
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     cp baz bbaz; 6-6+
  
  diff --git a/dir/baz b/dir/bbaz
  copy from dir/baz
  copy to dir/bbaz
  --- a/dir/baz
  +++ b/dir/bbaz
  @@ -7,7 +7,7 @@
   3+
   4
   5
  -6
  +6+
   7
   8
   9
  
  changeset:   3:730a61fbaecf
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     to 11
  
  diff --git a/foo b/foo
  --- a/foo
  +++ b/foo
  @@ -6,3 +6,10 @@
   2+
   3
   4
  +5
  +6
  +7
  +8
  +9
  +10
  +11
  
  $ hg log -f -L bbaz,10:11 -p
  changeset:   10:91a3d3b6c546
  tag:         tip
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     cp baz bbaz; 6-6+
  
  diff --git a/dir/baz b/dir/bbaz
  copy from dir/baz
  copy to dir/bbaz
  --- a/dir/baz
  +++ b/dir/bbaz
  @@ -7,7 +7,7 @@
   3+
   4
   5
  -6
  +6+
   7
   8
   9
  
  changeset:   3:730a61fbaecf
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     to 11
  
  diff --git a/foo b/foo
  --- a/foo
  +++ b/foo
  @@ -6,3 +6,10 @@
   2+
   3
   4
  +5
  +6
  +7
  +8
  +9
  +10
  +11
  

Binary files work but without diff hunks filtering.
(Checking w/ and w/o diff.git option.)

  >>> open('binary', 'wb').write(b'this\nis\na\nbinary\0') and None
  $ hg add binary
  $ hg ci -m 'add a binary file' --quiet
  $ hg log -f -L binary,1:2 -p
  changeset:   11:dc865b608edf
  tag:         tip
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     add a binary file
  
  diff --git a/dir/binary b/dir/binary
  new file mode 100644
  index e69de29bb2d1d6434b8b29ae775ad8c2e48c5391..c2e1fbed209fe919b3f189a6a31950e9adf61e45
  GIT binary patch
  literal 17
  Wc$_QA$SmdpqC~Ew%)G>+N(KNlNClYy
  
  
  $ hg log -f -L binary,1:2 -p --config diff.git=false
  changeset:   11:dc865b608edf
  tag:         tip
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     add a binary file
  
  diff -r 91a3d3b6c546 -r dc865b608edf dir/binary
  Binary file dir/binary has changed
  

Option --follow is required.

  $ hg log -L foo,5:7
  abort: --line-range requires --follow
  [255]

Non-exact pattern kinds are not allowed.

  $ cd ..
  $ hg log -f -L glob:*a*,1:2
  hg: parse error: line range pattern 'glob:*a*' must match exactly one file
  [255]

We get an error for removed files.

  $ hg rm dir/baz
  $ hg ci -m 'remove baz' --quiet
  $ hg log -f -L dir/baz,5:7 -p
  abort: cannot follow file not in parent revision: "dir/baz"
  [255]