parse-options: multi-word argh should use dash to separate words

"When you need to use space, use dash" is a strange way to say that
you must not use a space.  Because it is more common for the command
line descriptions to use dashed-multi-words, you do not even want to
use spaces in these places.  Rephrase the documentation to avoid
this strangeness.

Fix a few existing multi-word argument help strings, i.e.

 - GPG key-ids given to -S/--gpg-sign are "key-id";
 - Refs used for storing notes are "notes-ref"; and
 - Expiry timestamps given to --expire are "expiry-date".

and update the corresponding documentation pages.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

6 files changed, 6 insertions, 6 deletions

diff --git a/builtin/checkout.c b/builtin/checkout.c
index ada51fa70f..a0e72d21e0 100644
--- a/builtin/checkout.c
+++ b/builtin/checkout.c
@@ -1095,7 +1095,7 @@ int cmd_checkout(int argc, const char **argv, const char *prefix)
 		OPT_BOOL(0, "detach", &opts.force_detach, N_("detach the HEAD at named commit")),
 		OPT_SET_INT('t', "track",  &opts.track, N_("set upstream info for new branch"),
 			BRANCH_TRACK_EXPLICIT),
-		OPT_STRING(0, "orphan", &opts.new_orphan_branch, N_("new branch"), N_("new unparented branch")),
+		OPT_STRING(0, "orphan", &opts.new_orphan_branch, N_("new-branch"), N_("new unparented branch")),
 		OPT_SET_INT('2', "ours", &opts.writeout_stage, N_("checkout our version for unmerged files"),
 			    2),
 		OPT_SET_INT('3', "theirs", &opts.writeout_stage, N_("checkout their version for unmerged files"),
diff --git a/builtin/commit.c b/builtin/commit.c
index 3783bcadcd..96bf7620c5 100644
--- a/builtin/commit.c
+++ b/builtin/commit.c
@@ -1472,7 +1472,7 @@ int cmd_commit(int argc, const char **argv, const char *prefix)
 		OPT_BOOL('e', "edit", &edit_flag, N_("force edit of commit")),
 		OPT_STRING(0, "cleanup", &cleanup_arg, N_("default"), N_("how to strip spaces and #comments from message")),
 		OPT_BOOL(0, "status", &include_status, N_("include status in commit message template")),
-		{ OPTION_STRING, 'S', "gpg-sign", &sign_commit, N_("key id"),
+		{ OPTION_STRING, 'S', "gpg-sign", &sign_commit, N_("key-id"),
 		  N_("GPG sign commit"), PARSE_OPT_OPTARG, NULL, (intptr_t) "" },
 		/* end commit message options */
 
diff --git a/builtin/merge.c b/builtin/merge.c
index f0cf1205fa..2a144e1200 100644
--- a/builtin/merge.c
+++ b/builtin/merge.c
@@ -220,7 +220,7 @@ static struct option builtin_merge_options[] = {
 	OPT_BOOL(0, "abort", &abort_current_merge,
 		N_("abort the current in-progress merge")),
 	OPT_SET_INT(0, "progress", &show_progress, N_("force progress reporting"), 1),
-	{ OPTION_STRING, 'S', "gpg-sign", &sign_commit, N_("key id"),
+	{ OPTION_STRING, 'S', "gpg-sign", &sign_commit, N_("key-id"),
 	  N_("GPG sign commit"), PARSE_OPT_OPTARG, NULL, (intptr_t) "" },
 	OPT_BOOL(0, "overwrite-ignore", &overwrite_ignore, N_("update ignored files (default)")),
 	OPT_END()
diff --git a/builtin/notes.c b/builtin/notes.c
index bb89930373..39c8573cde 100644
--- a/builtin/notes.c
+++ b/builtin/notes.c
@@ -939,7 +939,7 @@ int cmd_notes(int argc, const char **argv, const char *prefix)
 	int result;
 	const char *override_notes_ref = NULL;
 	struct option options[] = {
-		OPT_STRING(0, "ref", &override_notes_ref, N_("notes_ref"),
+		OPT_STRING(0, "ref", &override_notes_ref, N_("notes-ref"),
 			   N_("use notes from <notes_ref>")),
 		OPT_END()
 	};
diff --git a/builtin/revert.c b/builtin/revert.c
index 065d88dd05..f9ed5bd5d0 100644
--- a/builtin/revert.c
+++ b/builtin/revert.c
@@ -89,7 +89,7 @@ static void parse_args(int argc, const char **argv, struct replay_opts *opts)
 		OPT_STRING(0, "strategy", &opts->strategy, N_("strategy"), N_("merge strategy")),
 		OPT_CALLBACK('X', "strategy-option", &opts, N_("option"),
 			N_("option for merge strategy"), option_parse_x),
-		{ OPTION_STRING, 'S', "gpg-sign", &opts->gpg_sign, N_("key id"),
+		{ OPTION_STRING, 'S', "gpg-sign", &opts->gpg_sign, N_("key-id"),
 		  N_("GPG sign commit"), PARSE_OPT_OPTARG, NULL, (intptr_t) "" },
 		OPT_END(),
 		OPT_END(),
diff --git a/builtin/tag.c b/builtin/tag.c
index 40356e3e41..6c7c6bde9d 100644
--- a/builtin/tag.c
+++ b/builtin/tag.c
@@ -513,7 +513,7 @@ int cmd_tag(int argc, const char **argv, const char *prefix)
 		OPT_BOOL('s', "sign", &opt.sign, N_("annotated and GPG-signed tag")),
 		OPT_STRING(0, "cleanup", &cleanup_arg, N_("mode"),
 			N_("how to strip spaces and #comments from message")),
-		OPT_STRING('u', "local-user", &keyid, N_("key id"),
+		OPT_STRING('u', "local-user", &keyid, N_("key-id"),
 					N_("use another key to sign the tag")),
 		OPT__FORCE(&force, N_("replace the tag if exists")),
 		OPT_COLUMN(0, "column", &colopts, N_("show tag list in columns")),