Supplant the "while case ... break ;; esac" idiom

A lot of shell scripts contained stuff starting with

	while case "$#" in 0) break ;; esac

and similar.  I consider breaking out of the condition instead of the
body od the loop ugly, and the implied "true" value of the
non-matching case is not really obvious to humans at first glance.  It
happens not to be obvious to some BSD shells, either, but that's
because they are not POSIX-compliant.  In most cases, this has been
replaced by a straight condition using "test".  "case" has the
advantage of being faster than "test" on vintage shells where "test"
is not a builtin.  Since none of them is likely to run the git
scripts, anyway, the added readability should be worth the change.

A few loops have had their termination condition expressed
differently.

Signed-off-by: David Kastrup <dak@gnu.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

contrib/examples/git-gc.sh

@@ -9,7 +9,7 @@ SUBDIRECTORY_OK=Yes
 . git-sh-setup
 
 no_prune=:
-while case $# in 0) break ;; esac
+while test $# != 0
 do
 	case "$1" in
 	--prune)

contrib/examples/git-tag.sh

@@ -14,7 +14,7 @@ username=
 list=
 verify=
 LINES=0
-while case "$#" in 0) break ;; esac
+while test $# != 0
 do
     case "$1" in
     -a)

contrib/examples/git-verify-tag.sh

@@ -5,7 +5,7 @@ SUBDIRECTORY_OK='Yes'
 . git-sh-setup
 
 verbose=
-while case $# in 0) break;; esac
+while test $# != 0
 do
 	case "$1" in
 	-v|--v|--ve|--ver|--verb|--verbo|--verbos|--verbose)

git-am.sh

@@ -109,7 +109,7 @@ dotest=.dotest sign= utf8=t keep= skip= interactive= resolved= binary=
 resolvemsg= resume=
 git_apply_opt=
 
-while case "$#" in 0) break;; esac
+while test $# != 0
 do
 	case "$1" in
 	-d=*|--d=*|--do=*|--dot=*|--dote=*|--dotes=*|--dotest=*)

git-clean.sh

@@ -26,7 +26,7 @@ rmrf="rm -rf --"
 rm_refuse="echo Not removing"
 echo1="echo"
 
-while case "$#" in 0) break ;; esac
+while test $# != 0
 do
 	case "$1" in
 	-d)

git-commit.sh

@@ -89,7 +89,7 @@ force_author=
 only_include_assumed=
 untracked_files=
 templatefile="`git config commit.template`"
-while case "$#" in 0) break;; esac
+while test $# != 0
 do
 	case "$1" in
 	-F|--F|-f|--f|--fi|--fil|--file)

git-fetch.sh

@@ -27,7 +27,7 @@ shallow_depth=
 no_progress=
 test -t 1 || no_progress=--no-progress
 quiet=
-while case "$#" in 0) break ;; esac
+while test $# != 0
 do
 	case "$1" in
 	-a|--a|--ap|--app|--appe|--appen|--append)

git-filter-branch.sh

@@ -105,8 +105,9 @@ filter_tag_name=
 filter_subdir=
 orig_namespace=refs/original/
 force=
-while case "$#" in 0) usage;; esac
+while :
 do
+	test $# = 0 && usage
 	case "$1" in
 	--)
 		shift

git-instaweb.sh

@@ -61,7 +61,7 @@ stop_httpd () {
 	test -f "$fqgitdir/pid" && kill `cat "$fqgitdir/pid"`
 }
 
-while case "$#" in 0) break ;; esac
+while test $# != 0
 do
 	case "$1" in
 	--stop|stop)

git-ls-remote.sh

@@ -13,7 +13,7 @@ die () {
 }
 
 exec=
-while case "$#" in 0) break;; esac
+while test $# != 0
 do
   case "$1" in
   -h|--h|--he|--hea|--head|--heads)

git-merge.sh

@@ -122,7 +122,7 @@ merge_name () {
 case "$#" in 0) usage ;; esac
 
 have_message=
-while case "$#" in 0) break ;; esac
+while test $# != 0
 do
 	case "$1" in
 	-n|--n|--no|--no-|--no-s|--no-su|--no-sum|--no-summ|\

git-mergetool.sh

@@ -268,7 +268,7 @@ merge_file () {
     cleanup_temp_files
 }
 
-while case $# in 0) break ;; esac
+while test $# != 0
 do
     case "$1" in
 	-t|--tool*)

git-pull.sh

@@ -16,7 +16,7 @@ test -z "$(git ls-files -u)" ||
 	die "You are in the middle of a conflicted merge."
 
 strategy_args= no_summary= no_commit= squash=
-while case "$#,$1" in 0) break ;; *,-*) ;; *) break ;; esac
+while :
 do
 	case "$1" in
 	-n|--n|--no|--no-|--no-s|--no-su|--no-sum|--no-summ|\
@@ -46,8 +46,8 @@ do
 	-h|--h|--he|--hel|--help)
 		usage
 		;;
-	-*)
+	*)
-		# Pass thru anything that is meant for fetch.
+		# Pass thru anything that may be meant for fetch.
 		break
 		;;
 	esac

git-quiltimport.sh

@@ -5,7 +5,7 @@ SUBDIRECTORY_ON=Yes
 
 dry_run=""
 quilt_author=""
-while case "$#" in 0) break;; esac
+while test $# != 0
 do
 	case "$1" in
 	--au=*|--aut=*|--auth=*|--autho=*|--author=*)

git-rebase--interactive.sh

@@ -317,7 +317,7 @@ do_rest () {
 	done
 }
 
-while case $# in 0) break ;; esac
+while test $# != 0
 do
 	case "$1" in
 	--continue)

git-rebase.sh

@@ -122,15 +122,14 @@ finish_rb_merge () {
 
 is_interactive () {
 	test -f "$dotest"/interactive ||
-	while case $#,"$1" in 0,|*,-i|*,--interactive) break ;; esac
+	while :; do case $#,"$1" in 0,|*,-i|*,--interactive) break ;; esac
-	do
 		shift
 	done && test -n "$1"
 }
 
 is_interactive "$@" && exec git-rebase--interactive "$@"
 
-while case "$#" in 0) break ;; esac
+while test $# != 0
 do
 	case "$1" in
 	--continue)

git-repack.sh

@@ -9,7 +9,7 @@ SUBDIRECTORY_OK='Yes'
 
 no_update_info= all_into_one= remove_redundant=
 local= quiet= no_reuse= extra=
-while case "$#" in 0) break ;; esac
+while test $# != 0
 do
 	case "$1" in
 	-n)	no_update_info=t ;;

git-reset.sh

@@ -11,7 +11,7 @@ require_work_tree
 update= reset_type=--mixed
 unset rev
 
-while case $# in 0) break ;; esac
+while test $# != 0
 do
 	case "$1" in
 	--mixed | --soft | --hard)

git-submodule.sh

@@ -251,7 +251,7 @@ modules_list()
 	done
 }
 
-while case "$#" in 0) break ;; esac
+while test $# != 0
 do
 	case "$1" in
 	add)