builtin/apply: move 'apply' global into 'struct apply_state'

To libify the apply functionality the 'apply' variable should
not be static and global to the file. Let's move it into
'struct apply_state'.

Reviewed-by: Stefan Beller <sbeller@google.com>
Signed-off-by: Christian Couder <chriscool@tuxfamily.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin/apply.c

@@ -26,6 +26,7 @@ struct apply_state {
 	int prefix_length;
 
 	/* These control what gets looked at and modified */
+	int apply; /* this is not a dry-run */
 	int cached; /* apply to the index only */
 	int check; /* preimage must match working tree, don't actually apply */
 	int check_index; /* preimage must match the indexed version */
@@ -56,7 +57,7 @@ static int newfd = -1;
 
 static int state_p_value = 1;
 static int p_value_known;
-static int apply = 1;
+
 static const char * const apply_usage[] = {
 	N_("git apply [<options>] [<patch>...]"),
 	NULL
@@ -126,10 +127,11 @@ static void parse_ignorewhitespace_option(const char *option)
 	die(_("unrecognized whitespace ignore option '%s'"), option);
 }
 
-static void set_default_whitespace_mode(const char *whitespace_option)
+static void set_default_whitespace_mode(struct apply_state *state,
+					const char *whitespace_option)
 {
 	if (!whitespace_option && !apply_default_whitespace)
-		ws_error_action = (apply ? warn_on_ws_error : nowarn_ws_error);
+		ws_error_action = (state->apply ? warn_on_ws_error : nowarn_ws_error);
 }
 
 /*
@@ -2058,7 +2060,7 @@ static int parse_chunk(struct apply_state *state, char *buffer, unsigned long si
 		 * without metadata change.  A binary patch appears
 		 * empty to us here.
 		 */
-		if ((apply || state->check) &&
+		if ((state->apply || state->check) &&
 		    (!patch->is_binary && !metadata_changes(patch)))
 			die(_("patch with only garbage at line %d"), state_linenr);
 	}
@@ -2916,7 +2918,7 @@ static int apply_one_fragment(struct apply_state *state,
 			 * apply_data->apply_fragments->apply_one_fragment
 			 */
 			if (ws_error_action == die_on_ws_error)
-				apply = 0;
+				state->apply = 0;
 		}
 
 		if (state->apply_verbosely && applied_pos != pos) {
@@ -4460,9 +4462,9 @@ static int apply_patch(struct apply_state *state,
 		die(_("unrecognized input"));
 
 	if (whitespace_error && (ws_error_action == die_on_ws_error))
-		apply = 0;
+		state->apply = 0;
 
-	state->update_index = state->check_index && apply;
+	state->update_index = state->check_index && state->apply;
 	if (state->update_index && newfd < 0)
 		newfd = hold_locked_index(&lock_file, 1);
 
@@ -4471,12 +4473,12 @@ static int apply_patch(struct apply_state *state,
 			die(_("unable to read index file"));
 	}
 
-	if ((state->check || apply) &&
+	if ((state->check || state->apply) &&
 	    check_patch_list(state, list) < 0 &&
 	    !state->apply_with_reject)
 		exit(1);
 
-	if (apply && write_out_results(state, list)) {
+	if (state->apply && write_out_results(state, list)) {
 		if (state->apply_with_reject)
 			exit(1);
 		/* with --3way, we still need to write the index out */
@@ -4565,6 +4567,7 @@ static void init_apply_state(struct apply_state *state, const char *prefix)
 	memset(state, 0, sizeof(*state));
 	state->prefix = prefix;
 	state->prefix_length = state->prefix ? strlen(state->prefix) : 0;
+	state->apply = 1;
 	state->line_termination = '\n';
 	state->p_context = UINT_MAX;
 
@@ -4676,9 +4679,9 @@ int cmd_apply(int argc, const char **argv, const char *prefix)
 		state.check_index = 1;
 	}
 	if (state.apply_with_reject)
-		apply = state.apply_verbosely = 1;
+		state.apply = state.apply_verbosely = 1;
 	if (!force_apply && (state.diffstat || state.numstat || state.summary || state.check || state.fake_ancestor))
-		apply = 0;
+		state.apply = 0;
 	if (state.check_index && is_not_gitdir)
 		die(_("--index outside a repository"));
 	if (state.cached) {
@@ -4706,11 +4709,11 @@ int cmd_apply(int argc, const char **argv, const char *prefix)
 		if (fd < 0)
 			die_errno(_("can't open patch '%s'"), arg);
 		read_stdin = 0;
-		set_default_whitespace_mode(whitespace_option);
+		set_default_whitespace_mode(&state, whitespace_option);
 		errs |= apply_patch(&state, fd, arg, options);
 		close(fd);
 	}
-	set_default_whitespace_mode(whitespace_option);
+	set_default_whitespace_mode(&state, whitespace_option);
 	if (read_stdin)
 		errs |= apply_patch(&state, 0, "<stdin>", options);
 	if (whitespace_error) {
@@ -4728,7 +4731,7 @@ int cmd_apply(int argc, const char **argv, const char *prefix)
 			       "%d lines add whitespace errors.",
 			       whitespace_error),
 			    whitespace_error);
-		if (applied_after_fixing_ws && apply)
+		if (applied_after_fixing_ws && state.apply)
 			warning("%d line%s applied after"
 				" fixing whitespace errors.",
 				applied_after_fixing_ws,