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

To libify the apply functionality the 'unidiff_zero' 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

@@ -24,6 +24,9 @@
 struct apply_state {
 	const char *prefix;
 	int prefix_length;
+
+	/* These boolean parameters control how the apply is done */
+	int unidiff_zero;
 };
 
 /*
@@ -37,7 +40,6 @@ struct apply_state {
  */
 static int newfd = -1;
 
-static int unidiff_zero;
 static int state_p_value = 1;
 static int p_value_known;
 static int check_index;
@@ -2694,7 +2696,8 @@ static void update_image(struct image *img,
  * postimage) for the hunk.  Find lines that match "preimage" in "img" and
  * replace the part of "img" with "postimage" text.
  */
-static int apply_one_fragment(struct image *img, struct fragment *frag,
+static int apply_one_fragment(struct apply_state *state,
+			      struct image *img, struct fragment *frag,
 			      int inaccurate_eof, unsigned ws_rule,
 			      int nth_fragment)
 {
@@ -2836,7 +2839,7 @@ static int apply_one_fragment(struct image *img, struct fragment *frag,
 	 * without leading context must match at the beginning.
 	 */
 	match_beginning = (!frag->oldpos ||
-			   (frag->oldpos == 1 && !unidiff_zero));
+			   (frag->oldpos == 1 && !state->unidiff_zero));
 
 	/*
 	 * A hunk without trailing lines must match at the end.
@@ -2844,7 +2847,7 @@ static int apply_one_fragment(struct image *img, struct fragment *frag,
 	 * from the lack of trailing lines if the patch was generated
 	 * with unidiff without any context.
 	 */
-	match_end = !unidiff_zero && !trailing;
+	match_end = !state->unidiff_zero && !trailing;
 
 	pos = frag->newpos ? (frag->newpos - 1) : 0;
 	preimage.buf = oldlines;
@@ -3067,7 +3070,7 @@ static int apply_binary(struct image *img, struct patch *patch)
 	return 0;
 }
 
-static int apply_fragments(struct image *img, struct patch *patch)
+static int apply_fragments(struct apply_state *state, struct image *img, struct patch *patch)
 {
 	struct fragment *frag = patch->fragments;
 	const char *name = patch->old_name ? patch->old_name : patch->new_name;
@@ -3080,7 +3083,7 @@ static int apply_fragments(struct image *img, struct patch *patch)
 
 	while (frag) {
 		nth++;
-		if (apply_one_fragment(img, frag, inaccurate_eof, ws_rule, nth)) {
+		if (apply_one_fragment(state, img, frag, inaccurate_eof, ws_rule, nth)) {
 			error(_("patch failed: %s:%ld"), name, frag->oldpos);
 			if (!apply_with_reject)
 				return -1;
@@ -3388,8 +3391,11 @@ static int load_current(struct image *image, struct patch *patch)
 	return 0;
 }
 
-static int try_threeway(struct image *image, struct patch *patch,
+static int try_threeway(struct apply_state *state,
-			struct stat *st, const struct cache_entry *ce)
+			struct image *image,
+			struct patch *patch,
+			struct stat *st,
+			const struct cache_entry *ce)
 {
 	unsigned char pre_sha1[20], post_sha1[20], our_sha1[20];
 	struct strbuf buf = STRBUF_INIT;
@@ -3415,7 +3421,7 @@ static int try_threeway(struct image *image, struct patch *patch,
 	img = strbuf_detach(&buf, &len);
 	prepare_image(&tmp_image, img, len, 1);
 	/* Apply the patch to get the post image */
-	if (apply_fragments(&tmp_image, patch) < 0) {
+	if (apply_fragments(state, &tmp_image, patch) < 0) {
 		clear_image(&tmp_image);
 		return -1;
 	}
@@ -3459,7 +3465,8 @@ static int try_threeway(struct image *image, struct patch *patch,
 	return 0;
 }
 
-static int apply_data(struct patch *patch, struct stat *st, const struct cache_entry *ce)
+static int apply_data(struct apply_state *state, struct patch *patch,
+		      struct stat *st, const struct cache_entry *ce)
 {
 	struct image image;
 
@@ -3467,9 +3474,9 @@ static int apply_data(struct patch *patch, struct stat *st, const struct cache_e
 		return -1;
 
 	if (patch->direct_to_threeway ||
-	    apply_fragments(&image, patch) < 0) {
+	    apply_fragments(state, &image, patch) < 0) {
 		/* Note: with --reject, apply_fragments() returns 0 */
-		if (!threeway || try_threeway(&image, patch, st, ce) < 0)
+		if (!threeway || try_threeway(state, &image, patch, st, ce) < 0)
 			return -1;
 	}
 	patch->result = image.buf;
@@ -3717,7 +3724,7 @@ static void die_on_unsafe_path(struct patch *patch)
  * Check and apply the patch in-core; leave the result in patch->result
  * for the caller to write it out to the final destination.
  */
-static int check_patch(struct patch *patch)
+static int check_patch(struct apply_state *state, struct patch *patch)
 {
 	struct stat st;
 	const char *old_name = patch->old_name;
@@ -3816,13 +3823,13 @@ static int check_patch(struct patch *patch)
 		return error(_("affected file '%s' is beyond a symbolic link"),
 			     patch->new_name);
 
-	if (apply_data(patch, &st, ce) < 0)
+	if (apply_data(state, patch, &st, ce) < 0)
 		return error(_("%s: patch does not apply"), name);
 	patch->rejected = 0;
 	return 0;
 }
 
-static int check_patch_list(struct patch *patch)
+static int check_patch_list(struct apply_state *state, struct patch *patch)
 {
 	int err = 0;
 
@@ -3832,7 +3839,7 @@ static int check_patch_list(struct patch *patch)
 		if (apply_verbosely)
 			say_patch_name(stderr,
 				       _("Checking patch %s..."), patch);
-		err |= check_patch(patch);
+		err |= check_patch(state, patch);
 		patch = patch->next;
 	}
 	return err;
@@ -4434,7 +4441,7 @@ static int apply_patch(struct apply_state *state,
 	}
 
 	if ((check || apply) &&
-	    check_patch_list(list) < 0 &&
+	    check_patch_list(state, list) < 0 &&
 	    !apply_with_reject)
 		exit(1);
 
@@ -4602,7 +4609,7 @@ int cmd_apply(int argc, const char **argv, const char *prefix)
 			PARSE_OPT_NOARG, option_parse_space_change },
 		OPT_BOOL('R', "reverse", &apply_in_reverse,
 			N_("apply the patch in reverse")),
-		OPT_BOOL(0, "unidiff-zero", &unidiff_zero,
+		OPT_BOOL(0, "unidiff-zero", &state.unidiff_zero,
 			N_("don't expect at least one line of context")),
 		OPT_BOOL(0, "reject", &apply_with_reject,
 			N_("leave the rejected hunks in corresponding *.rej files")),