[PATCH v6 0/5] [GSoC] remove_subtree(): reimplement using iterators

[Daniel Ferreira <bnmvco@gmail.com>]

This is the sixth version of a patch series that implements the GSoC
microproject of converting a recursive call to readdir() to use dir_iterator.

v1: https://public-inbox.org/git/CAGZ79kZwT-9mHTiOJ5CEjk2wDFkn6+NcogjX0=vjhsAh16ANYg@mail.gmail.com/T/#t
v2: https://public-inbox.org/git/CACsJy8Dxh-QPBBLfaFWPAWUsbA9GVXA7x+mXLjEvYKhk1zOpig@mail.gmail.com/T/#t
v3: https://public-inbox.org/git/CAGZ79kYtpmURSQWPumobA=e3JBFjKhWCdv_LPhKCd71ZRwMovA@mail.gmail.com/T/#t
v4: https://public-inbox.org/git/1490747533-89143-1-git-send-email-bnmvco@gmail.com/T/#e437a63e0c22c00c69b5d92977c9b438ed2b9fd3a
v5: https://public-inbox.org/git/1490844730-47634-1-git-send-email-bnmvco@gmail.com/T/#m2323f15e45de699f2e09364f40a62e17047cf453

Back in v5, Michael had a number of suggestions, all of which were applied
to this version (including a slightly modified version of his "biggish rewrite"
project to make dir_iterator's state machine simpler). The only suggestion that
did not make it into this series was that of not traversing into subdirectories,
since I believe it would be better off in another series that actually required
that feature (that is, I do not want a series to implement a feature it will
not need). The same goes for Junio's thought on a flag to list *only* directories
and no files on the v4 discussion.

Junio and Peff's comments about how to write to files in the tests were also
considered, and the tests were adjusted.

I chose to squash both the state machine refactor and the addition of the
new flags in a single commit. I do not know whether you will feel this is
the right choice but it seemed natural, since most of the state machine's
new logic would not even make sense without encompassing the new features.
I am, of course, open for feedback on this decision.

To Michael and Duy, thanks -- really -- for the encouraging comments! :)
I never regarded this microproject purely as a means to fulfill a GSoC
requirement, but as a way to get to learn more about Git, so I'm surely
not giving it up.

Once again, thanks for all the previous reviews,
Daniel.

Daniel Ferreira (5):
  dir_iterator: add tests for dir_iterator API
  remove_subtree(): test removing nested directories
  dir_iterator: add helpers to dir_iterator_advance
  dir_iterator: refactor state machine model
  remove_subtree(): reimplement using iterators

 Makefile                        |   1 +
 dir-iterator.c                  | 190 ++++++++++++++++++++++++++--------------
 dir-iterator.h                  |  28 ++++--
 entry.c                         |  38 +++-----
 refs/files-backend.c            |   2 +-
 t/helper/.gitignore             |   1 +
 t/helper/test-dir-iterator.c    |  32 +++++++
 t/t0065-dir-iterator.sh         | 109 +++++++++++++++++++++++
 t/t2000-checkout-cache-clash.sh |  11 +++
 9 files changed, 312 insertions(+), 100 deletions(-)
 create mode 100644 t/helper/test-dir-iterator.c
 create mode 100755 t/t0065-dir-iterator.sh

--
2.7.4 (Apple Git-66)