bisect: fix "git bisect skip <commit>" and add tests cases

The patch that allows "git bisect skip" to be passed a range of
commits using the "<commit1>..<commit2>" notation is flawed because
it introduces a regression when it was passed a simple rev or commit.

"git bisect skip <commit>" doesn't work any more, because <commit>
is quoted but not properly unquoted.

This patch fixes that and add tests cases to better check when it is
passed commits and range of commits.

While at it, this patch also properly quotes the non range arguments
using the "sq" function.

Signed-off-by: Christian Couder <chriscool@tuxfamily.org>

git-bisect.sh

@@ -199,11 +199,11 @@ bisect_skip() {
             *..*)
                 revs=$(git rev-list "$arg") || die "Bad rev input: $arg" ;;
             *)
-                revs="'$arg'" ;;
+                revs=$(sq "$arg") ;;
 	    esac
             all="$all $revs"
         done
-        bisect_state 'skip' $all
+        eval bisect_state 'skip' $all
 }
 
 bisect_state() {

t/t6030-bisect-porcelain.sh

@@ -313,8 +313,25 @@ test_expect_success 'bisect run & skip: find first bad' '
 	grep "$HASH6 is first bad commit" my_bisect_log.txt
 '
 
-test_expect_success 'bisect starting with a detached HEAD' '
+test_expect_success 'bisect skip only one range' '
+	git bisect reset &&
+	git bisect start $HASH7 $HASH1 &&
+	git bisect skip $HASH1..$HASH5 &&
+	test "$HASH6" = "$(git rev-parse --verify HEAD)" &&
+	test_must_fail git bisect bad > my_bisect_log.txt &&
+	grep "first bad commit could be any of" my_bisect_log.txt
+'
 
+test_expect_success 'bisect skip many ranges' '
+	git bisect start $HASH7 $HASH1 &&
+	test "$HASH4" = "$(git rev-parse --verify HEAD)" &&
+	git bisect skip $HASH2 $HASH2.. ..$HASH5 &&
+	test "$HASH6" = "$(git rev-parse --verify HEAD)" &&
+	test_must_fail git bisect bad > my_bisect_log.txt &&
+	grep "first bad commit could be any of" my_bisect_log.txt
+'
+
+test_expect_success 'bisect starting with a detached HEAD' '
 	git bisect reset &&
 	git checkout master^ &&
 	HEAD=$(git rev-parse --verify HEAD) &&