[PATCH 0/6] sparse-checkout: make set subsume init

As described at [1], the split of init and set subcommands in sparse-checkout causes multiple issues:

 * Poor performance (deleting all tracked files, then later restoring many
   and maybe even most of them)
 * Poor UI (multiple progress bars in wrappers that hide both commands under
   1 user-facing command)
 * Loss of ignored files under directories the user wanted to keep

This series fixes this bug by providing a single command to switch to a sparse-checkout: set. It does so by making set able to do the combined work of init and set. It keeps init as-is to give folks time to adapt, but marks it as deprecated.

A quick overview:

 * Patches 1-2: small preparatory refactorings
 * Patch 3: the crux of the series
 * Patches 4-5: documentation modifications (Patch 4 is worth reviewing; it
   marks init as deprecated -- are others okay with that?)
 * Patch 6: trivial modification of git clone --sparse to use git
   sparse-checkout set rather than git sparse-checkout init.

[1] https://lore.kernel.org/git/CABPp-BE8TJ8QGAQWsSGT7S+9Xp-XmApcC9PSw3K=RQOP0rt+PQ@mail.gmail.com/

Elijah Newren (6):
  sparse-checkout: pass use_stdin as a parameter instead of as a global
  sparse-checkout: break apart functions for sparse_checkout_(set|add)
  sparse-checkout: enable `set` to initialize sparse-checkout mode
  git-sparse-checkout.txt: update to document that set handles init
  Documentation: clarify/correct a few sparsity related statements
  clone: avoid using deprecated `sparse-checkout init`

 Documentation/git-clone.txt           |   8 +-
 Documentation/git-sparse-checkout.txt |  94 ++++++++++---------
 builtin/clone.c                       |   2 +-
 builtin/sparse-checkout.c             | 130 +++++++++++++++++++++-----
 4 files changed, 160 insertions(+), 74 deletions(-)

base-commit: abe6bb3905392d5eb6b01fa6e54d7e784e0522aa
Published-As: https://github.com/gitgitgadget/git/releases/tag/pr-git-1151%2Fnewren%2Fsparse-checkout-no-init-v1
Fetch-It-Via: git fetch https://github.com/gitgitgadget/git pr-git-1151/newren/sparse-checkout-no-init-v1
Pull-Request: https://github.com/git/git/pull/1151