[PATCH v3 2/8] test-lib: parse options in a for loop to keep $@ intact

["SZEDER Gábor" <szeder.dev@gmail.com>]

'test-lib.sh' looks for the presence of certain options like '--tee'
and '--verbose-log', so it can execute the test script again to save
its standard output and error, and to do so it needs the original
command line options the test was invoked with.

The next patch is about to move the option parsing loop earlier in
'test-lib.sh', but it is implemented using 'shift' in a while loop,
effecively destroying "$@" by the end of the option parsing.  Not
good.

As a preparatory step, turn that option parsing loop into a 'for opt
in "$@"' loop to preserve "$@" intact while iterating over the
options, and taking extra care to handle the '-r' option's required
argument (or the lack thereof).

Signed-off-by: SZEDER Gábor <szeder.dev@gmail.com>
---
 t/test-lib.sh | 77 ++++++++++++++++++++++++++++-----------------------
 1 file changed, 42 insertions(+), 35 deletions(-)

diff --git a/t/test-lib.sh b/t/test-lib.sh
index 9a3f7930a3..ed7267962f 100644
--- a/t/test-lib.sh
+++ b/t/test-lib.sh
@@ -264,58 +264,59 @@ test "x$TERM" != "xdumb" && (
 	) &&
 	color=t
 
-while test "$#" -ne 0
+store_arg_to=
+prev_opt=
+for opt
 do
-	case "$1" in
+	if test -n "$store_arg_to"
+	then
+		eval $store_arg_to=\$opt
+		store_arg_to=
+		prev_opt=
+		continue
+	fi
+
+	case "$opt" in
 	-d|--d|--de|--deb|--debu|--debug)
-		debug=t; shift ;;
+		debug=t ;;
 	-i|--i|--im|--imm|--imme|--immed|--immedi|--immedia|--immediat|--immediate)
-		immediate=t; shift ;;
+		immediate=t ;;
 	-l|--l|--lo|--lon|--long|--long-|--long-t|--long-te|--long-tes|--long-test|--long-tests)
-		GIT_TEST_LONG=t; export GIT_TEST_LONG; shift ;;
+		GIT_TEST_LONG=t; export GIT_TEST_LONG ;;
 	-r)
-		shift; test "$#" -ne 0 || {
-			echo 'error: -r requires an argument' >&2;
-			exit 1;
-		}
-		run_list=$1; shift ;;
+		store_arg_to=run_list
+		;;
 	--run=*)
-		run_list=${1#--*=}; shift ;;
+		run_list=${opt#--*=} ;;
 	-h|--h|--he|--hel|--help)
-		help=t; shift ;;
+		help=t ;;
 	-v|--v|--ve|--ver|--verb|--verbo|--verbos|--verbose)
-		verbose=t; shift ;;
+		verbose=t ;;
 	--verbose-only=*)
-		verbose_only=${1#--*=}
-		shift ;;
+		verbose_only=${opt#--*=}
+		;;
 	-q|--q|--qu|--qui|--quie|--quiet)
 		# Ignore --quiet under a TAP::Harness. Saying how many tests
 		# passed without the ok/not ok details is always an error.
-		test -z "$HARNESS_ACTIVE" && quiet=t; shift ;;
+		test -z "$HARNESS_ACTIVE" && quiet=t ;;
 	--with-dashes)
-		with_dashes=t; shift ;;
+		with_dashes=t ;;
 	--no-color)
-		color=; shift ;;
+		color= ;;
 	--va|--val|--valg|--valgr|--valgri|--valgrin|--valgrind)
-		valgrind=memcheck
-		shift ;;
+		valgrind=memcheck ;;
 	--valgrind=*)
-		valgrind=${1#--*=}
-		shift ;;
+		valgrind=${opt#--*=} ;;
 	--valgrind-only=*)
-		valgrind_only=${1#--*=}
-		shift ;;
+		valgrind_only=${opt#--*=} ;;
 	--tee)
-		shift ;; # was handled already
+		;; # was handled already
 	--root=*)
-		root=${1#--*=}
-		shift ;;
+		root=${opt#--*=} ;;
 	--chain-lint)
-		GIT_TEST_CHAIN_LINT=1
-		shift ;;
+		GIT_TEST_CHAIN_LINT=1 ;;
 	--no-chain-lint)
-		GIT_TEST_CHAIN_LINT=0
-		shift ;;
+		GIT_TEST_CHAIN_LINT=0 ;;
 	-x)
 		# Some test scripts can't be reliably traced  with '-x',
 		# unless the test is run with a Bash version supporting
@@ -335,14 +336,20 @@ do
 		else
 			echo >&2 "warning: ignoring -x; '$0' is untraceable without BASH_XTRACEFD"
 		fi
-		shift ;;
+		;;
 	-V|--verbose-log)
-		verbose_log=t
-		shift ;;
+		verbose_log=t ;;
 	*)
-		echo "error: unknown test option '$1'" >&2; exit 1 ;;
+		echo "error: unknown test option '$opt'" >&2; exit 1 ;;
 	esac
+
+	prev_opt=$opt
 done
+if test -n "$store_arg_to"
+then
+	echo "error: $prev_opt requires an argument" >&2
+	exit 1
+fi
 
 if test -n "$valgrind_only"
 then
-- 
2.20.1.151.gec613c4b75