[PATCH v8 34/41] apply: add 'be_silent' variable to 'struct apply_state'

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This variable should prevent anything to be printed on both stderr
and stdout.

Let's not take care of stdout and apply_verbosely for now though,
as that will be taken care of in following patches.

Signed-off-by: Christian Couder <chriscool@xxxxxxxxxxxxx>
---
 apply.c | 43 +++++++++++++++++++++++++++++--------------
 apply.h |  1 +
 2 files changed, 30 insertions(+), 14 deletions(-)

diff --git a/apply.c b/apply.c
index 7bf12a7..802fa79 100644
--- a/apply.c
+++ b/apply.c
@@ -1617,8 +1617,9 @@ static void record_ws_error(struct apply_state *state,
 		return;
 
 	err = whitespace_error_string(result);
-	fprintf(stderr, "%s:%d: %s.\n%.*s\n",
-		state->patch_input_file, linenr, err, len, line);
+	if (!state->be_silent)
+		fprintf(stderr, "%s:%d: %s.\n%.*s\n",
+			state->patch_input_file, linenr, err, len, line);
 	free(err);
 }
 
@@ -1813,7 +1814,7 @@ static int parse_single_patch(struct apply_state *state,
 		return error(_("new file %s depends on old contents"), patch->new_name);
 	if (0 < patch->is_delete && newlines)
 		return error(_("deleted file %s still has contents"), patch->old_name);
-	if (!patch->is_delete && !newlines && context)
+	if (!patch->is_delete && !newlines && context && !state->be_silent)
 		fprintf_ln(stderr,
 			   _("** warning: "
 			     "file %s becomes empty but is not deleted"),
@@ -3038,8 +3039,8 @@ static int apply_one_fragment(struct apply_state *state,
 		 * Warn if it was necessary to reduce the number
 		 * of context lines.
 		 */
-		if ((leading != frag->leading) ||
-		    (trailing != frag->trailing))
+		if ((leading != frag->leading ||
+		     trailing != frag->trailing) && !state->be_silent)
 			fprintf_ln(stderr, _("Context reduced to (%ld/%ld)"
 					     " to apply fragment at %d"),
 				   leading, trailing, applied_pos+1);
@@ -3536,7 +3537,8 @@ static int try_threeway(struct apply_state *state,
 		 read_blob_object(&buf, pre_sha1, patch->old_mode))
 		return error("repository lacks the necessary blob to fall back on 3-way merge.");
 
-	fprintf(stderr, "Falling back to three-way merge...\n");
+	if (!state->be_silent)
+		fprintf(stderr, "Falling back to three-way merge...\n");
 
 	img = strbuf_detach(&buf, &len);
 	prepare_image(&tmp_image, img, len, 1);
@@ -3566,7 +3568,9 @@ static int try_threeway(struct apply_state *state,
 	status = three_way_merge(image, patch->new_name,
 				 pre_sha1, our_sha1, post_sha1);
 	if (status < 0) {
-		fprintf(stderr, "Failed to fall back on three-way merge...\n");
+		if (!state->be_silent)
+			fprintf(stderr,
+				"Failed to fall back on three-way merge...\n");
 		return status;
 	}
 
@@ -3578,9 +3582,15 @@ static int try_threeway(struct apply_state *state,
 			hashcpy(patch->threeway_stage[0].hash, pre_sha1);
 		hashcpy(patch->threeway_stage[1].hash, our_sha1);
 		hashcpy(patch->threeway_stage[2].hash, post_sha1);
-		fprintf(stderr, "Applied patch to '%s' with conflicts.\n", patch->new_name);
+		if (!state->be_silent)
+			fprintf(stderr,
+				"Applied patch to '%s' with conflicts.\n",
+				patch->new_name);
 	} else {
-		fprintf(stderr, "Applied patch to '%s' cleanly.\n", patch->new_name);
+		if (!state->be_silent)
+			fprintf(stderr,
+				"Applied patch to '%s' cleanly.\n",
+				patch->new_name);
 	}
 	return 0;
 }
@@ -4483,7 +4493,8 @@ static int write_out_one_reject(struct apply_state *state, struct patch *patch)
 			    "Applying patch %%s with %d rejects...",
 			    cnt),
 		    cnt);
-	say_patch_name(stderr, sb.buf, patch);
+	if (!state->be_silent)
+		say_patch_name(stderr, sb.buf, patch);
 	strbuf_release(&sb);
 
 	cnt = strlen(patch->new_name);
@@ -4510,10 +4521,12 @@ static int write_out_one_reject(struct apply_state *state, struct patch *patch)
 	     frag;
 	     cnt++, frag = frag->next) {
 		if (!frag->rejected) {
-			fprintf_ln(stderr, _("Hunk #%d applied cleanly."), cnt);
+			if (!state->be_silent)
+				fprintf_ln(stderr, _("Hunk #%d applied cleanly."), cnt);
 			continue;
 		}
-		fprintf_ln(stderr, _("Rejected hunk #%d."), cnt);
+		if (!state->be_silent)
+			fprintf_ln(stderr, _("Rejected hunk #%d."), cnt);
 		fprintf(rej, "%.*s", frag->size, frag->patch);
 		if (frag->patch[frag->size-1] != '\n')
 			fputc('\n', rej);
@@ -4562,8 +4575,10 @@ static int write_out_results(struct apply_state *state, struct patch *list)
 		struct string_list_item *item;
 
 		string_list_sort(&cpath);
-		for_each_string_list_item(item, &cpath)
-			fprintf(stderr, "U %s\n", item->string);
+		if (!state->be_silent) {
+			for_each_string_list_item(item, &cpath)
+				fprintf(stderr, "U %s\n", item->string);
+		}
 		string_list_clear(&cpath, 0);
 
 		rerere(0);
diff --git a/apply.h b/apply.h
index df44b51..44bed19 100644
--- a/apply.h
+++ b/apply.h
@@ -52,6 +52,7 @@ struct apply_state {
 	int apply_in_reverse;
 	int apply_with_reject;
 	int apply_verbosely;
+	int be_silent;
 	int no_add;
 	int threeway;
 	int unidiff_zero;
-- 
2.9.0.172.gfb57a78

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