[PATCH v2 1/3] t: consolidate the `is_hidden` functions

["Johannes Schindelin via GitGitGadget" <gitgitgadget@gmail.com>]

From: Johannes Schindelin <johannes.schindelin@gmx.de>

The `is_hidden` function can be used (only on Windows) to determine
whether a directory or file have their `hidden` flag set.

This function is duplicated between two test scripts. It is better to
move it into `test-lib-functions.sh` so that it is reused.

To make it safer to use, we specifically test for the `MINGW` prereq
now, so that it is not used on a non-Windows platform by mistake.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
---
 t/t0001-init.sh         |  9 +--------
 t/t5611-clone-config.sh | 13 +++----------
 t/test-lib-functions.sh | 10 ++++++++++
 3 files changed, 14 insertions(+), 18 deletions(-)

diff --git a/t/t0001-init.sh b/t/t0001-init.sh
index 26f82063267..1edd5aeb8f0 100755
--- a/t/t0001-init.sh
+++ b/t/t0001-init.sh
@@ -392,13 +392,6 @@ test_expect_success SYMLINKS 're-init to move gitdir symlink' '
 	test_path_is_dir realgitdir/refs
 '
 
-# Tests for the hidden file attribute on windows
-is_hidden () {
-	# Use the output of `attrib`, ignore the absolute path
-	case "$(attrib "$1")" in *H*?:*) return 0;; esac
-	return 1
-}
-
 test_expect_success MINGW '.git hidden' '
 	rm -rf newdir &&
 	(
@@ -406,7 +399,7 @@ test_expect_success MINGW '.git hidden' '
 		mkdir newdir &&
 		cd newdir &&
 		git init &&
-		is_hidden .git
+		test_path_is_hidden .git
 	) &&
 	check_config newdir/.git false unset
 '
diff --git a/t/t5611-clone-config.sh b/t/t5611-clone-config.sh
index 60c1ba951b7..8e0fd398236 100755
--- a/t/t5611-clone-config.sh
+++ b/t/t5611-clone-config.sh
@@ -92,24 +92,17 @@ test_expect_success 'clone -c remote.<remote>.fetch=<refspec> --origin=<name>' '
 	test_cmp expect actual
 '
 
-# Tests for the hidden file attribute on windows
-is_hidden () {
-	# Use the output of `attrib`, ignore the absolute path
-	case "$(attrib "$1")" in *H*?:*) return 0;; esac
-	return 1
-}
-
 test_expect_success MINGW 'clone -c core.hideDotFiles' '
 	test_commit attributes .gitattributes "" &&
 	rm -rf child &&
 	git clone -c core.hideDotFiles=false . child &&
-	! is_hidden child/.gitattributes &&
+	! test_path_is_hidden child/.gitattributes &&
 	rm -rf child &&
 	git clone -c core.hideDotFiles=dotGitOnly . child &&
-	! is_hidden child/.gitattributes &&
+	! test_path_is_hidden child/.gitattributes &&
 	rm -rf child &&
 	git clone -c core.hideDotFiles=true . child &&
-	is_hidden child/.gitattributes
+	test_path_is_hidden child/.gitattributes
 '
 
 test_done
diff --git a/t/test-lib-functions.sh b/t/test-lib-functions.sh
index 352c213d52e..09a2479fd38 100644
--- a/t/test-lib-functions.sh
+++ b/t/test-lib-functions.sh
@@ -1543,3 +1543,13 @@ test_bitmap_traversal () {
 	test_cmp "$1.normalized" "$2.normalized" &&
 	rm -f "$1.normalized" "$2.normalized"
 }
+
+# Tests for the hidden file attribute on windows
+test_path_is_hidden () {
+	test_have_prereq MINGW ||
+	BUG "test_path_is_hidden can only be used on Windows"
+
+	# Use the output of `attrib`, ignore the absolute path
+	case "$(attrib "$1")" in *H*?:*) return 0;; esac
+	return 1
+}
-- 
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