[PATCH 0/5] parse_branchname_arg(): make code easier to understand

["Alexandr Miloslavskiy via GitGitGadget" <gitgitgadget@gmail.com>]

My bigger goal is to complete my --pathspec-from-file series of patches.

For this, I needed to evaluate whether parse_branchname_arg() heuristics
needs any changes when pathspec is passed, but NOT in args.

I found it surprisingly hard to reason about the code in this function. This
mostly happens due to "obfuscated" variables, where they have a clear name
and a different actual meaning. Ultimately, it was hard to mentally expand
them to true meaning AND see all possible combinations of branches at once.

I have split this refactoring in 4 patches, so that diffs are not too big in
every single patch.

To my understanding, there should be no changes in git's behavior, except
for a couple better die() messages.

Alexandr Miloslavskiy (5):
  parse_branchname_arg(): fix dash_dash_pos, drop argcount
  parse_branchname_arg(): introduce expect_commit_only
  parse_branchname_arg(): update code comments
  parse_branchname_arg(): refactor the decision making
  t2024: cover more cases

 builtin/checkout.c       | 174 ++++++++++++++++-----------------------
 t/t2024-checkout-dwim.sh |  27 ++++++
 2 files changed, 97 insertions(+), 104 deletions(-)


base-commit: d9f6f3b6195a0ca35642561e530798ad1469bd41
Published-As: https://github.com/gitgitgadget/git/releases/tag/pr-479%2FSyntevoAlex%2F%230225(git)_refactor_parse_branchname_arg-v1
Fetch-It-Via: git fetch https://github.com/gitgitgadget/git pr-479/SyntevoAlex/#0225(git)_refactor_parse_branchname_arg-v1
Pull-Request: https://github.com/gitgitgadget/git/pull/479
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