tests/test-grep.t

store: implement fncache basic path encoding in C

(This is not yet enabled; it will be turned on in a followup patch.)

The path encoding performed by fncache is complex and (perhaps
surprisingly) slow enough to negatively affect the overall performance
of Mercurial.

For a short path (< 120 bytes), the Python code can be reduced to a fairly
tractable state machine that either determines that nothing needs to be
done in a single pass, or performs the encoding in a second pass.

For longer paths, we avoid the more complicated hashed encoding scheme
for now, and fall back to Python.

Raw performance: I measured in a repo containing 150,000 files in its tip
manifest, with a median path name length of 57 bytes, and 95th percentile
of 96 bytes.

In this repo, the Python code takes 3.1 seconds to encode all path
names, while the hybrid C-and-Python code (called from Python) takes
0.21 seconds, for a speedup of about 14.

Across several other large repositories, I've measured the speedup from
the C code at between 26x and 40x.

For path names above 120 bytes where we must fall back to Python for
hashed encoding, the speedup is about 1.7x.  Thus absolute performance
will depend strongly on the characteristics of a particular repository.

  $ 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
  [1]

simple

  $ hg grep port port
  port:4:export
  port:4:vaportight
  port:4:import/export

simple with color

  $ hg --config extensions.color= grep --config color.mode=ansi \
  >     --color=always port port
  port:4:ex\x1b[0;31;1mport\x1b[0m (esc)
  port:4:va\x1b[0;31;1mport\x1b[0might (esc)
  port:4:im\x1b[0;31;1mport\x1b[0m/export (esc)

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:export
  port:2:1:+:spam:export
  port:2:2:+:spam:vaportight
  port:2:3:+:spam:import/export
  port:1:2:+:eggs:export
  port:0:1:+:spam:import

other

  $ hg grep import port
  port:4:import/export

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

follow

  $ hg grep --traceback -f 'import\n\Z' port2
  port:0:import
  
  $ 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:export
  port:2:1:+:spam:export
  port:2:2:+:spam:vaportight
  port:2:3:+:spam:import/export
  port:1:2:+:eggs:export
  port:0:1:+:spam:import

  $ cd ..
  $ hg init t2
  $ cd t2
  $ hg grep foobar foo
  [1]
  $ hg grep 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 orange
  color:3:orange
  $ hg grep --all orange
  color:3:+:orange
  color:2:-:orange
  color:1:+:orange


match in last "line" without newline

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

  $ cd ..

Issue685: trackback 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 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

  $ 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

  $ cd ..