[PATCH v4 0/2] dir: traverse into repository

From: Goss Geppert <ggossdev@gmail.com>

This latest version of the patch series contains relatively minor modifications relative to the previous version. Let me know if there is anything else I need to do.

Changes compared to v3:
* remove the commit that caches the gitdir's realpath as this was deemed
  a premature optimization given the amount of code churn
* use git option `-C` in some of the testcases to avoid creating a
  subshell

Goss Geppert (2):
  dir: traverse into repository
  dir: minor refactoring / clean-up

 dir.c                          |  35 ++++-
 t/t2205-add-worktree-config.sh | 265 +++++++++++++++++++++++++++++++++
 2 files changed, 293 insertions(+), 7 deletions(-)
 create mode 100755 t/t2205-add-worktree-config.sh

Range-diff against v3:
1:  0fc8886f1e ! 1:  f84cefe731 dir: traverse into repository
    @@ t/t2205-add-worktree-config.sh (new)
     +	(
     +	cd test1 &&
     +	local parent_dir="$(pwd)" &&
    -+	(
    -+		cd repo &&
    -+		git ls-files -o --exclude-standard "$parent_dir" >../actual-all-unsorted
    -+	) &&
    ++	git -C repo ls-files -o --exclude-standard "$parent_dir" >actual-all-unsorted &&
     +	sort actual-all-unsorted >actual-all &&
     +	sort expect-all-unsorted >expect-all &&
     +	test_cmp expect-all actual-all
    @@ t/t2205-add-worktree-config.sh (new)
     +	(
     +	cd test1 &&
     +	local parent_dir="$(pwd)" &&
    -+	(
    -+		cd repo &&
    -+		git ls-files -o --directory --exclude-standard "$parent_dir" >../actual-all-dir-unsorted
    -+	) &&
    ++	git -C repo ls-files -o --directory --exclude-standard "$parent_dir" >actual-all-dir-unsorted &&
     +	sort actual-all-dir-unsorted >actual-all &&
     +	sort expect-all-dir-unsorted >expect-all &&
     +	test_cmp expect-all actual-all
    @@ t/t2205-add-worktree-config.sh (new)
     +	(
     +	cd test1 &&
     +	local parent_dir="$(pwd)" &&
    -+	(
    -+		cd repo &&
    -+		git ls-files -o --exclude-standard "$parent_dir" >../actual-untracked-unsorted
    -+	) &&
    ++	git -C repo ls-files -o --exclude-standard "$parent_dir" >actual-untracked-unsorted &&
     +	sort actual-untracked-unsorted >actual-untracked &&
     +	sort expect-untracked-unsorted >expect-untracked &&
     +	test_cmp expect-untracked actual-untracked
2:  a80cbd5517 < -:  ---------- dir: cache git_dir's realpath
3:  899c69300c = 2:  d4ff1bd40a dir: minor refactoring / clean-up