t/Makefile: apply chainlint.pl to existing self-tests

Now that chainlint.pl is functional, take advantage of the existing
chainlint self-tests to validate its operation. (While at it, stop
validating chainlint.sed against the self-tests since it will soon be
retired.)

Due to chainlint.sed implementation limitations leaking into the
self-test "expect" files, a few of them require minor adjustment to make
them compatible with chainlint.pl which does not share those
limitations.

First, because `sed` does not provide any sort of real recursion,
chainlint.sed only emulates recursion into subshells, and each level of
recursion leads to a multiplicative increase in complexity of the `sed`
rules. To avoid substantial complexity, chainlint.sed, therefore, only
emulates subshell recursion one level deep. Any subshell deeper than
that is passed through as-is, which means that &&-chains are not checked
in deeper subshells. chainlint.pl, on the other hand, employs a proper
recursive descent parser, thus checks subshells to any depth and
correctly flags broken &&-chains in deep subshells.

Second, due to sed's line-oriented nature, chainlint.sed, by necessity,
folds multi-line quoted strings into a single line. chainlint.pl, on the
other hand, employs a proper lexical analyzer which preserves quoted
strings as-is, including embedded newlines.

Furthermore, the output of chainlint.sed and chainlint.pl do not match
precisely in terms of whitespace. However, since the purpose of the
self-checks is to verify that the ?!AMP?! annotations are being
correctly added, minor whitespace differences are immaterial. For this
reason, rather than adjusting whitespace in all existing self-test
"expect" files to match the new linter's output, the `check-chainlint`
target ignores whitespace differences. Since `diff -w` is not POSIX,
`check-chainlint` attempts to employ `git diff -w`, and only falls back
to non-POSIX `diff -w` (and `-u`) if `git diff` is not available.

Signed-off-by: Eric Sunshine <sunshine@sunshineco.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

6 files changed, 46 insertions, 14 deletions

diff --git a/t/Makefile b/t/Makefile
index 1c80c0c79a..11f276774e 100644
--- a/t/Makefile
+++ b/t/Makefile
@@ -38,7 +38,7 @@ T = $(sort $(wildcard t[0-9][0-9][0-9][0-9]-*.sh))
 THELPERS = $(sort $(filter-out $(T),$(wildcard *.sh)))
 TPERF = $(sort $(wildcard perf/p[0-9][0-9][0-9][0-9]-*.sh))
 CHAINLINTTESTS = $(sort $(patsubst chainlint/%.test,%,$(wildcard chainlint/*.test)))
-CHAINLINT = sed -f chainlint.sed
+CHAINLINT = '$(PERL_PATH_SQ)' chainlint.pl
 
 all: $(DEFAULT_TEST_TARGET)
 
@@ -73,10 +73,29 @@ clean-chainlint:
 
 check-chainlint:
 	@mkdir -p '$(CHAINLINTTMP_SQ)' && \
-	sed -e '/^# LINT: /d' $(patsubst %,chainlint/%.test,$(CHAINLINTTESTS)) >'$(CHAINLINTTMP_SQ)'/tests && \
-	sed -e '/^[ 	]*$$/d' $(patsubst %,chainlint/%.expect,$(CHAINLINTTESTS)) >'$(CHAINLINTTMP_SQ)'/expect && \
-	$(CHAINLINT) '$(CHAINLINTTMP_SQ)'/tests | grep -v '^[	]*$$' >'$(CHAINLINTTMP_SQ)'/actual && \
-	diff -u '$(CHAINLINTTMP_SQ)'/expect '$(CHAINLINTTMP_SQ)'/actual
+	for i in $(CHAINLINTTESTS); do \
+		echo "test_expect_success '$$i' '" && \
+		sed -e '/^# LINT: /d' chainlint/$$i.test && \
+		echo "'"; \
+	done >'$(CHAINLINTTMP_SQ)'/tests && \
+	{ \
+		echo "# chainlint: $(CHAINLINTTMP_SQ)/tests" && \
+		for i in $(CHAINLINTTESTS); do \
+			echo "# chainlint: $$i" && \
+			sed -e '/^[ 	]*$$/d' chainlint/$$i.expect; \
+		done \
+	} >'$(CHAINLINTTMP_SQ)'/expect && \
+	$(CHAINLINT) --emit-all '$(CHAINLINTTMP_SQ)'/tests | \
+		grep -v '^[ 	]*$$' >'$(CHAINLINTTMP_SQ)'/actual && \
+	if test -f ../GIT-BUILD-OPTIONS; then \
+		. ../GIT-BUILD-OPTIONS; \
+	fi && \
+	if test -x ../git$$X; then \
+		DIFFW="../git$$X --no-pager diff -w --no-index"; \
+	else \
+		DIFFW="diff -w -u"; \
+	fi && \
+	$$DIFFW '$(CHAINLINTTMP_SQ)'/expect '$(CHAINLINTTMP_SQ)'/actual
 
 test-lint: test-lint-duplicates test-lint-executable test-lint-shell-syntax \
 	test-lint-filenames
diff --git a/t/chainlint/block.expect b/t/chainlint/block.expect
index da60257ebc..37dbf7d95f 100644
--- a/t/chainlint/block.expect
+++ b/t/chainlint/block.expect
@@ -1,7 +1,7 @@
 (
 	foo &&
 	{
-		echo a
+		echo a ?!AMP?!
 		echo b
 	} &&
 	bar &&
diff --git a/t/chainlint/here-doc-multi-line-string.expect b/t/chainlint/here-doc-multi-line-string.expect
index 2578191ca8..be64b26869 100644
--- a/t/chainlint/here-doc-multi-line-string.expect
+++ b/t/chainlint/here-doc-multi-line-string.expect
@@ -1,4 +1,5 @@
 (
-	cat <<-TXT && echo "multi-line	string" ?!AMP?!
+	cat <<-TXT && echo "multi-line
+	string" ?!AMP?!
 	bap
 )
diff --git a/t/chainlint/multi-line-string.expect b/t/chainlint/multi-line-string.expect
index ab0dadf748..27ff95218e 100644
--- a/t/chainlint/multi-line-string.expect
+++ b/t/chainlint/multi-line-string.expect
@@ -1,9 +1,14 @@
 (
-	x="line 1		line 2		line 3" &&
-	y="line 1		line2" ?!AMP?!
+	x="line 1
+		line 2
+		line 3" &&
+	y="line 1
+		line2" ?!AMP?!
 	foobar
 ) &&
 (
-	echo "xyz" "abc		def		ghi" &&
+	echo "xyz" "abc
+		def
+		ghi" &&
 	barfoo
 )
diff --git a/t/chainlint/nested-subshell.expect b/t/chainlint/nested-subshell.expect
index 41a48adaa2..02e0a9f1bb 100644
--- a/t/chainlint/nested-subshell.expect
+++ b/t/chainlint/nested-subshell.expect
@@ -6,7 +6,7 @@
 	) >file &&
 	cd foo &&
 	(
-		echo a
+		echo a ?!AMP?!
 		echo b
 	) >file
 )
diff --git a/t/chainlint/t7900-subtree.expect b/t/chainlint/t7900-subtree.expect
index 1cccc7bf7e..69167da2f2 100644
--- a/t/chainlint/t7900-subtree.expect
+++ b/t/chainlint/t7900-subtree.expect
@@ -1,10 +1,17 @@
 (
-	chks="sub1sub2sub3sub4" &&
+	chks="sub1
+sub2
+sub3
+sub4" &&
 	chks_sub=$(cat <<TXT | sed "s,^,sub dir/,"
 ) &&
-	chkms="main-sub1main-sub2main-sub3main-sub4" &&
+	chkms="main-sub1
+main-sub2
+main-sub3
+main-sub4" &&
 	chkms_sub=$(cat <<TXT | sed "s,^,sub dir/,"
 ) &&
 	subfiles=$(git ls-files) &&
-	check_equal "$subfiles" "$chkms$chks"
+	check_equal "$subfiles" "$chkms
+$chks"
 )