git-apply --reject: send rejects to .rej files.

... just like everybody else does, instead of sending it to the standard
output, which was just silly.

Signed-off-by: Junio C Hamano <junkio@cox.net>

builtin-apply.c

@@ -2242,36 +2242,61 @@ static void write_out_one_result(struct patch *patch, int phase)
 
 static int write_out_one_reject(struct patch *patch)
 {
+	FILE *rej;
+	char namebuf[PATH_MAX];
 	struct fragment *frag;
-	int rejects = 0;
+	int cnt = 0;
 
-	for (rejects = 0, frag = patch->fragments; frag; frag = frag->next) {
+	for (cnt = 0, frag = patch->fragments; frag; frag = frag->next) {
 		if (!frag->rejected)
 			continue;
-		if (rejects == 0) {
-			rejects = 1;
-			printf("** Rejected hunk(s) for ");
-			if (patch->old_name && patch->new_name &&
-			    strcmp(patch->old_name, patch->new_name)) {
-				write_name_quoted(NULL, 0,
-						  patch->old_name, 1, stdout);
-				fputs(" => ", stdout);
-				write_name_quoted(NULL, 0,
-						  patch->new_name, 1, stdout);
-			}
-			else {
-				const char *n = patch->new_name;
-				if (!n)
-					n = patch->old_name;
-				write_name_quoted(NULL, 0, n, 1, stdout);
-			}
-			printf(" **\n");
-		}
-		printf("%.*s", frag->size, frag->patch);
-		if (frag->patch[frag->size-1] != '\n')
-			putchar('\n');
+		cnt++;
 	}
-	return rejects;
+
+	if (!cnt)
+		return 0;
+
+	/* This should not happen, because a removal patch that leaves
+	 * contents are marked "rejected" at the patch level.
+	 */
+	if (!patch->new_name)
+		die("internal error");
+
+	cnt = strlen(patch->new_name);
+	if (ARRAY_SIZE(namebuf) <= cnt + 5) {
+		cnt = ARRAY_SIZE(namebuf) - 5;
+		fprintf(stderr,
+			"warning: truncating .rej filename to %.*s.rej",
+			cnt - 1, patch->new_name);
+	}
+	memcpy(namebuf, patch->new_name, cnt);
+	memcpy(namebuf + cnt, ".rej", 5);
+
+	rej = fopen(namebuf, "w");
+	if (!rej)
+		return error("cannot open %s: %s", namebuf, strerror(errno));
+
+	/* Normal git tools never deal with .rej, so do not pretend
+	 * this is a git patch by saying --git nor give extended
+	 * headers.  While at it, maybe please "kompare" that wants
+	 * the trailing TAB and some garbage at the end of line ;-).
+	 */
+	fprintf(rej, "diff a/%s b/%s\t(rejected hunks)\n",
+		patch->new_name, patch->new_name);
+	for (cnt = 0, frag = patch->fragments;
+	     frag;
+	     cnt++, frag = frag->next) {
+		if (!frag->rejected) {
+			fprintf(stderr, "Hunk #%d applied cleanly.\n", cnt);
+			continue;
+		}
+		fprintf(stderr, "Rejected hunk #%d.\n", cnt);
+		fprintf(rej, "%.*s", frag->size, frag->patch);
+		if (frag->patch[frag->size-1] != '\n')
+			fputc('\n', rej);
+	}
+	fclose(rej);
+	return -1;
 }
 
 static int write_out_results(struct patch *list, int skipped_patch)
@@ -2288,16 +2313,9 @@ static int write_out_results(struct patch *list, int skipped_patch)
 		while (l) {
 			if (l->rejected)
 				errs = 1;
-			else
+			else {
 				write_out_one_result(l, phase);
-			l = l->next;
-		}
-	}
-	if (apply_with_reject) {
-		l = list;
-		while (l) {
-			if (!l->rejected) {
-				if (write_out_one_reject(l))
+				if (phase == 1 && write_out_one_reject(l))
 					errs = 1;
 			}
 			l = l->next;

t/t4117-apply-reject.sh

@@ -23,6 +23,12 @@ test_expect_success setup '
 		echo $i
 	done >file1 &&
 	git diff >patch.1 &&
+	cat file1 >clean &&
+
+	for i in 1 E 2 3 4 5 6 7 8 9 10 11 12 C 13 14 15 16 17 18 19 20 F 21
+	do
+		echo $i
+	done >expected &&
 
 	mv file1 file2 &&
 	git update-index --add --remove file1 file2 &&
@@ -53,25 +59,30 @@ test_expect_success 'apply without --reject should fail' '
 
 test_expect_success 'apply with --reject should fail but update the file' '
 
-	cat saved.file1 >file1
+	cat saved.file1 >file1 &&
+	rm -f file1.rej file2.rej &&
 
-	if git apply --reject patch.1 >rejects
+	if git apply --reject patch.1
 	then
 		echo "succeeds with --reject?"
 		exit 1
 	fi
-	cat rejects
-	for i in 1 E 2 3 4 5 6 7 8 9 10 11 12 C 13 14 15 16 17 18 19 20 F 21
-	do
-		echo $i
-	done >expected.file1 &&
 
-	diff -u file1 expected.file1
+	diff -u file1 expected &&
+
+	cat file1.rej &&
+
+	if test -f file2.rej
+	then
+		echo "file2 should not have been touched"
+		exit 1
+	fi
 '
 
 test_expect_success 'apply with --reject should fail but update the file' '
 
-	cat saved.file1 >file1
+	cat saved.file1 >file1 &&
+	rm -f file1.rej file2.rej file2 &&
 
 	if git apply --reject patch.2 >rejects
 	then
@@ -79,18 +90,20 @@ test_expect_success 'apply with --reject should fail but update the file' '
 		exit 1
 	fi
 
-	cat rejects
-
-	for i in 1 E 2 3 4 5 6 7 8 9 10 11 12 C 13 14 15 16 17 18 19 20 F 21
-	do
-		echo $i
-	done >expected.file2 &&
-
 	test -f file1 && {
 		echo "file1 still exists?"
 		exit 1
 	}
-	diff -u file2 expected.file2
+	diff -u file2 expected &&
+
+	cat file2.rej &&
+
+	if test -f file1.rej
+	then
+		echo "file2 should not have been touched"
+		exit 1
+	fi
+
 '
 
 test_done