tag, branch, for-each-ref: add --ignore-case for sorting and filtering

This options makes sorting ignore case, which is great when you have
branches named bug-12-do-something, Bug-12-do-some-more and
BUG-12-do-what and want to group them together. Sorting externally may
not be an option because we lose coloring and column layout from
git-branch and git-tag.

The same could be said for filtering, but it's probably less important
because you can always go with the ugly pattern [bB][uU][gG]-* if you're
desperate.

You can't have case-sensitive filtering and case-insensitive sorting (or
the other way around) with this though. For branch and tag, that should
be no problem. for-each-ref, as a plumbing, might want finer control.
But we can always add --{filter,sort}-ignore-case when there is a need
for it.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

2 files changed, 56 insertions, 0 deletions

diff --git a/t/t3203-branch-output.sh b/t/t3203-branch-output.sh
index c6a3ccba1b..52283dfc8c 100755
--- a/t/t3203-branch-output.sh
+++ b/t/t3203-branch-output.sh
@@ -89,6 +89,11 @@ test_expect_success 'git branch --list -v pattern shows branch summaries' '
 	awk "{print \$NF}" <tmp >actual &&
 	test_cmp expect actual
 '
+test_expect_success 'git branch --ignore-case --list -v pattern shows branch summaries' '
+	git branch --list --ignore-case -v BRANCH* >tmp &&
+	awk "{print \$NF}" <tmp >actual &&
+	test_cmp expect actual
+'
 
 test_expect_success 'git branch -v pattern does not show branch summaries' '
 	test_must_fail git branch -v branch*
@@ -196,4 +201,28 @@ test_expect_success 'local-branch symrefs shortened properly' '
 	test_cmp expect actual
 '
 
+test_expect_success 'sort branches, ignore case' '
+	(
+		git init sort-icase &&
+		cd sort-icase &&
+		test_commit initial &&
+		git branch branch-one &&
+		git branch BRANCH-two &&
+		git branch --list | awk "{print \$NF}" >actual &&
+		cat >expected <<-\EOF &&
+		BRANCH-two
+		branch-one
+		master
+		EOF
+		test_cmp expected actual &&
+		git branch --list -i | awk "{print \$NF}" >actual &&
+		cat >expected <<-\EOF &&
+		branch-one
+		BRANCH-two
+		master
+		EOF
+		test_cmp expected actual
+	)
+'
+
 test_done
diff --git a/t/t7004-tag.sh b/t/t7004-tag.sh
index 8b0f71a2ac..07869b0c09 100755
--- a/t/t7004-tag.sh
+++ b/t/t7004-tag.sh
@@ -27,6 +27,30 @@ test_expect_success 'listing all tags in an empty tree should output nothing' '
 	test $(git tag | wc -l) -eq 0
 '
 
+test_expect_success 'sort tags, ignore case' '
+	(
+		git init sort &&
+		cd sort &&
+		test_commit initial &&
+		git tag tag-one &&
+		git tag TAG-two &&
+		git tag -l >actual &&
+		cat >expected <<-\EOF &&
+		TAG-two
+		initial
+		tag-one
+		EOF
+		test_cmp expected actual &&
+		git tag -l -i >actual &&
+		cat >expected <<-\EOF &&
+		initial
+		tag-one
+		TAG-two
+		EOF
+		test_cmp expected actual
+	)
+'
+
 test_expect_success 'looking for a tag in an empty tree should fail' \
 	'! (tag_exists mytag)'
 
@@ -81,6 +105,9 @@ test_expect_success 'listing all tags if one exists should output that tag' '
 test_expect_success 'listing a tag using a matching pattern should succeed' \
 	'git tag -l mytag'
 
+test_expect_success 'listing a tag with --ignore-case' \
+	'test $(git tag -l --ignore-case MYTAG) = mytag'
+
 test_expect_success \
 	'listing a tag using a matching pattern should output that tag' \
 	'test $(git tag -l mytag) = mytag'