chainlint: match "quoted" here-doc tags

A here-doc tag can be quoted ('EOF'/"EOF") or escaped (\EOF) to suppress
interpolation within the body. chainlint recognizes single-quoted and
escaped tags, but does not know about double-quoted tags. For
completeness, teach it to recognize double-quoted tags, as well.
Signed-off-by: NEric Sunshine <sunshine@sunshineco.com>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

t/chainlint.sed

@@ -94,8 +94,8 @@
 
 # here-doc -- swallow it to avoid false hits within its body (but keep the
 # command to which it was attached)
-/<<[ 	]*[-\\']*[A-Za-z0-9_]/ {
-	s/^\(.*\)<<[ 	]*[-\\']*\([A-Za-z0-9_][A-Za-z0-9_]*\)'*/<\2>\1<</
+/<<[ 	]*[-\\'"]*[A-Za-z0-9_]/ {
+	s/^\(.*\)<<[ 	]*[-\\'"]*\([A-Za-z0-9_][A-Za-z0-9_]*\)['"]*/<\2>\1<</
 	s/[ 	]*<<//
 	:hereslurp
 	N
@@ -159,7 +159,7 @@ s/.*\n//
 }
 :folded
 # here-doc -- swallow it
-/<<[ 	]*[-\\']*[A-Za-z0-9_]/bheredoc
+/<<[ 	]*[-\\'"]*[A-Za-z0-9_]/bheredoc
 # comment or empty line -- discard since final non-comment, non-empty line
 # before closing ")", "done", "elsif", "else", or "fi" will need to be
 # re-visited to drop "suspect" marking since final line of those constructs
@@ -281,7 +281,7 @@ bfolded
 # found here-doc -- swallow it to avoid false hits within its body (but keep
 # the command to which it was attached)
 :heredoc
-s/^\(.*\)<<[ 	]*[-\\']*\([A-Za-z0-9_][A-Za-z0-9_]*\)'*/<\2>\1<</
+s/^\(.*\)<<[ 	]*[-\\'"]*\([A-Za-z0-9_][A-Za-z0-9_]*\)['"]*/<\2>\1<</
 s/[ 	]*<<//
 :hereslurpsub
 N

t/chainlint/here-doc.expect

@@ -4,4 +4,6 @@ cat >foo &&
 
 cat >bar &&
 
+cat >boo &&
+
 horticulture

t/chainlint/here-doc.test

@@ -21,6 +21,13 @@ boz
 woz
 FUMP
 
+# LINT: swallow "quoted" here-doc
+cat <<"zump" >boo &&
+snoz
+boz
+woz
+zump
+
 # LINT: swallow here-doc (EOF is last line of test)
 horticulture <<\EOF
 gomez

t/chainlint/subshell-here-doc.expect

@@ -6,5 +6,6 @@
 (
 	cat >bup &&
 	cat >bup2 &&
+	cat >bup3 &&
 	meep
 >)

t/chainlint/subshell-here-doc.test

@@ -31,5 +31,9 @@
 	glink
 	FIZZ
 	ARBITRARY2
+	cat <<-"ARBITRARY3" >bup3 &&
+	glink
+	FIZZ
+	ARBITRARY3
 	meep
 )