check-non-portable-shell.pl: wc -l may have leading WS

tboegi · gitster · commit 7dbe8c8003f3 · 2017-12-22T13:00:51.000-08:00
Test scripts count number of lines in an output and check it againt its expectation. fb3340a ("test-lib: introduce test_line_count to measure files", 2010-10-31) introduced a helper to show a failure in such a test in a more readable way than comparing `wc -l` output with a number. Besides, on some platforms, "$(wc -l <file)" is padded with leading whitespace on the left, so test "$(wc -l <file)" = 4 would not work (most notably on macosX); the users of test_line_count helper would not suffer from such a portability glitch. Add a check in check-non-portable-shell.pl to find '"' between `wc -l` and '=' and hint the user about test_line_count(). Signed-off-by: Torsten Bögershausen <tboegi@web.de> Reviewed-by: Johannes Schindelin <Johannes.Schindelin@gmx.de> Helped-by: Eric Sunshine <sunshine@sunshineco.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/t/check-non-portable-shell.pl b/t/check-non-portable-shell.pl
@@ -21,6 +21,7 @@ sub err {
 	/^\s*declare\s+/ and err 'arrays/declare not portable';
 	/^\s*[^#]\s*which\s/ and err 'which is not portable (please use type)';
 	/\btest\s+[^=]*==/ and err '"test a == b" is not portable (please use =)';
+	/\bwc -l.*"\s*=/ and err '`"$(wc -l)"` is not portable (please use test_line_count)';
 	/\bexport\s+[A-Za-z0-9_]*=/ and err '"export FOO=bar" is not portable (please use FOO=bar && export FOO)';
 	# this resets our $. for each file
 	close ARGV if eof;
