[PATCH v2 00/22] pickaxe: test and refactoring for follow-up changes

This is a smaller v2 of the series to remove the kwset backend and make pickaxe use PCRE v2[1].

That's not being done here yet. These are mostly small refactoring/test fixes. The most significant work is a new xdiff interface at the end of the series.

It's based on next where some preparatory work already landed[2].

The endless loop bug in v1 pointed out by René Scharfe[3] is gone. We should still have a test for that, I didn't have time to do more on that, and figured this was already getting large enough.

I'll do some more improvements of test coverage in a follow-up series. I'm aware of various blind spots in pickaxe test coverage, but none of it should hide a bug in this refactoring from us.

It's things like how we deal with REG_NEWLINE, "^" matches etc., but all the matching logic for that stays the same in this series.

1. https://lore.kernel.org/git/20210203032811.14979-1-avarab@gmail.com/
2. https://lore.kernel.org/git/20210204210556.25242-1-avarab@gmail.com/
3. https://lore.kernel.org/git/4ef09db7-34f2-2fb5-b9e9-be69c7102787@web.de/

Ævar Arnfjörð Bjarmason (22):
  grep/pcre2 tests: reword comments referring to kwset
  test-lib-functions: document and test test_commit --no-tag
  test-lib-functions: reword "test_commit --append" docs
  test-lib functions: add --printf option to test_commit
  pickaxe tests: refactor to use test_commit --append --printf
  pickaxe tests: add test for diffgrep_consume() internals
  pickaxe tests: add test for "log -S" not being a regex
  pickaxe tests: test for -G, -S and --find-object incompatibility
  pickaxe: die when -G and --pickaxe-regex are combined
  pickaxe: die when --find-object and --pickaxe-all are combined
  diff.h: move pickaxe fields together again
  pickaxe/style: consolidate declarations and assignments
  perf: add performance test for pickaxe
  pickaxe: refactor function selection in diffcore-pickaxe()
  pickaxe: assert that we must have a needle under -G or -S
  pickaxe -S: support content with NULs under --pickaxe-regex
  pickaxe: rename variables in has_changes() for brevity
  pickaxe -S: slightly optimize contains()
  xdiff-interface: allow early return from xdiff_emit_{line,hunk}_fn
  xdiff-interface: support early exit in xdiff_outf()
  pickaxe -G: terminate early on matching lines
  pickaxe -G: don't special-case create/delete

 combine-diff.c                 |   9 ++-
 diff.c                         |  45 +++++++++------
 diff.h                         |   7 ++-
 diffcore-pickaxe.c             |  99 ++++++++++++++++++--------------
 range-diff.c                   |   8 ++-
 t/perf/p4209-pickaxe.sh        |  70 +++++++++++++++++++++++
 t/t0000-basic.sh               |  19 +++++++
 t/t1307-config-blob.sh         |   4 +-
 t/t2030-unresolve-info.sh      |   3 +-
 t/t4006-diff-mode.sh           |   6 +-
 t/t4030-diff-textconv.sh       |   8 +--
 t/t4209-log-pickaxe.sh         | 100 +++++++++++++++++++++++++++------
 t/t5520-pull.sh                |  10 +---
 t/t7816-grep-binary-pattern.sh |   4 +-
 t/test-lib-functions.sh        |  23 ++++++--
 xdiff-interface.c              |  26 ++++++---
 xdiff-interface.h              |  36 +++++++++---
 17 files changed, 349 insertions(+), 128 deletions(-)
 create mode 100755 t/perf/p4209-pickaxe.sh