t/chainlint: add chainlint "whitespace" test cases

The --chain-lint option uses heuristics and knowledge of shell syntax to
detect broken &&-chains in subshells by pure textual inspection. The
heuristics handle a range of stylistic variations in existing tests
(evolved over the years), however, they are still best-guesses. As such,
it is possible for future changes to accidentally break assumptions upon
which the heuristics are based. Protect against this possibility by
adding tests which check the linter itself for correctness.

In addition to protecting against regressions, these tests help document
(for humans) expected behavior, which is important since the linter's
implementation language ('sed') does not necessarily lend itself to easy
comprehension.

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

t/chainlint/blank-line.expect

@@ -0,0 +1,4 @@
+(
+	nothing &&
+	something
+>)

t/chainlint/blank-line.test

@@ -0,0 +1,10 @@
+(
+
+	nothing &&
+
+	something
+# LINT: swallow blank lines since final _statement_ before subshell end is
+# LINT: significant to "&&"-check, not final _line_ (which might be blank)
+
+
+)

t/chainlint/comment.expect

@@ -0,0 +1,4 @@
+(
+	nothing &&
+	something
+>)

t/chainlint/comment.test

@@ -0,0 +1,11 @@
+(
+# LINT: swallow comment lines
+	# comment 1
+	nothing &&
+	# comment 2
+	something
+# LINT: swallow comment lines since final _statement_ before subshell end is
+# LINT: significant to "&&"-check, not final _line_ (which might be comment)
+	# comment 3
+	# comment 4
+)

t/chainlint/here-doc.expect

@@ -0,0 +1,3 @@
+boodle wobba        gorgo snoot        wafta snurb &&
+
+horticulture

t/chainlint/here-doc.test

@@ -0,0 +1,16 @@
+# LINT: stitch together incomplete \-ending lines
+# LINT: swallow here-doc to avoid false positives in content
+boodle wobba \
+       gorgo snoot \
+       wafta snurb <<EOF &&
+quoth the raven,
+nevermore...
+EOF
+
+# LINT: swallow here-doc (EOF is last line of test)
+horticulture <<\EOF
+gomez
+morticia
+wednesday
+pugsly
+EOF

t/chainlint/incomplete-line.expect

@@ -0,0 +1,4 @@
+line 1 line 2 line 3 line 4 &&
+(
+	line 5 	line 6 	line 7 	line 8
+>)

t/chainlint/incomplete-line.test

@@ -0,0 +1,12 @@
+# LINT: stitch together all incomplete \-ending lines
+line 1 \
+line 2 \
+line 3 \
+line 4 &&
+(
+# LINT: stitch together all incomplete \-ending lines (subshell)
+	line 5 \
+	line 6 \
+	line 7 \
+	line 8
+)

t/chainlint/inline-comment.expect

@@ -0,0 +1,9 @@
+(
+	foobar &&
+?!AMP?!	barfoo
+	flibble "not a # comment"
+>) &&
+
+(
+cd foo &&
+>	flibble "not a # comment")

t/chainlint/inline-comment.test

@@ -0,0 +1,12 @@
+(
+# LINT: swallow inline comment (leaving command intact)
+	foobar && # comment 1
+# LINT: mispositioned "&&" (correctly) swallowed with comment
+	barfoo # wrong position for &&
+# LINT: "#" in string not misinterpreted as comment
+	flibble "not a # comment"
+) &&
+
+# LINT: "#" in string in cuddled subshell not misinterpreted as comment
+(cd foo &&
+	flibble "not a # comment")

t/chainlint/subshell-here-doc.expect

@@ -0,0 +1,5 @@
+(
+	echo wobba 	       gorgo snoot 	       wafta snurb &&
+?!AMP?!	cat >bip
+	echo >bop
+>)

t/chainlint/subshell-here-doc.test

@@ -0,0 +1,23 @@
+(
+# LINT: stitch together incomplete \-ending lines
+# LINT: swallow here-doc to avoid false positives in content
+	echo wobba \
+	       gorgo snoot \
+	       wafta snurb <<-EOF &&
+	quoth the raven,
+	nevermore...
+	EOF
+
+# LINT: missing "&&" on 'cat'
+	cat <<EOF >bip
+	fish fly high
+	EOF
+
+# LINT: swallow here-doc (EOF is last line of subshell)
+	echo <<-\EOF >bop
+	gomez
+	morticia
+	wednesday
+	pugsly
+	EOF
+)