git-cat-file: Add --batch option

--batch is similar to --batch-check, except that the contents of each object is
also printed. The output's form is:

<sha1> SP <type> SP <size> LF
<contents> LF

Signed-off-by: Adam Roben <aroben@apple.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

3 files changed, 117 insertions, 38 deletions

diff --git a/Documentation/git-cat-file.txt b/Documentation/git-cat-file.txt
index d5821af309..f6c394c482 100644
--- a/Documentation/git-cat-file.txt
+++ b/Documentation/git-cat-file.txt
@@ -9,7 +9,7 @@ git-cat-file - Provide content or type/size information for repository objects
 SYNOPSIS
 --------
 'git-cat-file' [-t | -s | -e | -p | <type>] <object>
-'git-cat-file' --batch-check < <list-of-objects>
+'git-cat-file' [--batch | --batch-check] < <list-of-objects>
 
 DESCRIPTION
 -----------
@@ -50,6 +50,10 @@ OPTIONS
 	or to ask for a "blob" with <object> being a tag object that
 	points at it.
 
+--batch::
+	Print the SHA1, type, size, and contents of each object provided on
+	stdin. May not be combined with any other options or arguments.
+
 --batch-check::
 	Print the SHA1, type, and size of each object provided on stdin. May not be
 	combined with any other options or arguments.
@@ -67,6 +71,14 @@ If '-p' is specified, the contents of <object> are pretty-printed.
 If <type> is specified, the raw (though uncompressed) contents of the <object>
 will be returned.
 
+If '--batch' is specified, output of the following form is printed for each
+object specified on stdin:
+
+------------
+<sha1> SP <type> SP <size> LF
+<contents> LF
+------------
+
 If '--batch-check' is specified, output of the following form is printed for
 each object specified fon stdin:
 
@@ -74,8 +86,8 @@ each object specified fon stdin:
 <sha1> SP <type> SP <size> LF
 ------------
 
-Additionally, output of the following form is printed for each object specified
-on stdin that does not exist in the repository:
+For both '--batch' and '--batch-check', output of the following form is printed
+for each object specified on stdin that does not exist in the repository:
 
 ------------
 <object> SP missing LF
diff --git a/builtin-cat-file.c b/builtin-cat-file.c
index 832cfd184a..b4d0c2545f 100644
--- a/builtin-cat-file.c
+++ b/builtin-cat-file.c
@@ -143,11 +143,12 @@ static int cat_one_file(int opt, const char *exp_type, const char *obj_name)
 	return 0;
 }
 
-static int batch_one_object(const char *obj_name)
+static int batch_one_object(const char *obj_name, int print_contents)
 {
 	unsigned char sha1[20];
 	enum object_type type;
 	unsigned long size;
+	void *contents = contents;
 
 	if (!obj_name)
 	   return 1;
@@ -157,22 +158,33 @@ static int batch_one_object(const char *obj_name)
 		return 0;
 	}
 
-	type = sha1_object_info(sha1, &size);
+	if (print_contents)
+		contents = read_sha1_file(sha1, &type, &size);
+	else
+		type = sha1_object_info(sha1, &size);
+
 	if (type <= 0)
 		return 1;
 
 	printf("%s %s %lu\n", sha1_to_hex(sha1), typename(type), size);
+	fflush(stdout);
+
+	if (print_contents) {
+		write_or_die(1, contents, size);
+		printf("\n");
+		fflush(stdout);
+	}
 
 	return 0;
 }
 
-static int batch_objects(void)
+static int batch_objects(int print_contents)
 {
 	struct strbuf buf;
 
 	strbuf_init(&buf, 0);
 	while (strbuf_getline(&buf, stdin, '\n') != EOF) {
-		int error = batch_one_object(buf.buf);
+		int error = batch_one_object(buf.buf, print_contents);
 		if (error)
 			return error;
 	}
@@ -180,37 +192,51 @@ static int batch_objects(void)
 	return 0;
 }
 
-static const char cat_file_usage[] = "git-cat-file [ [-t|-s|-e|-p|<type>] <sha1> | --batch-check < <list_of_sha1s> ]";
+static const char cat_file_usage[] = "git-cat-file [ [-t|-s|-e|-p|<type>] <sha1> | [--batch|--batch-check] < <list_of_sha1s> ]";
 
 int cmd_cat_file(int argc, const char **argv, const char *prefix)
 {
-	int i, opt = 0, batch_check = 0;
+	int i, opt = 0, batch = 0, batch_check = 0;
 	const char *exp_type = NULL, *obj_name = NULL;
 
 	git_config(git_default_config);
 
 	for (i = 1; i < argc; ++i) {
 		const char *arg = argv[i];
+		int is_batch = 0, is_batch_check = 0;
+
+		is_batch = !strcmp(arg, "--batch");
+		if (!is_batch)
+			is_batch_check = !strcmp(arg, "--batch-check");
 
-		if (!strcmp(arg, "--batch-check")) {
+		if (is_batch || is_batch_check) {
 			if (opt) {
-				error("git-cat-file: Can't use --batch-check with -%c", opt);
+				error("git-cat-file: Can't use %s with -%c", arg, opt);
 				usage(cat_file_usage);
 			} else if (exp_type) {
-				error("git-cat-file: Can't use --batch-check when a type (\"%s\") is specified", exp_type);
+				error("git-cat-file: Can't use %s when a type (\"%s\") is specified", arg, exp_type);
 				usage(cat_file_usage);
 			} else if (obj_name) {
-				error("git-cat-file: Can't use --batch-check when an object (\"%s\") is specified", obj_name);
+				error("git-cat-file: Can't use %s when an object (\"%s\") is specified", arg, obj_name);
 				usage(cat_file_usage);
 			}
 
-			batch_check = 1;
+			if ((is_batch && batch_check) || (is_batch_check && batch)) {
+				error("git-cat-file: Can't use %s with %s", arg, is_batch ? "--batch-check" : "--batch");
+				usage(cat_file_usage);
+			}
+
+			if (is_batch)
+				batch = 1;
+			else
+				batch_check = 1;
+
 			continue;
 		}
 
 		if (!strcmp(arg, "-t") || !strcmp(arg, "-s") || !strcmp(arg, "-e") || !strcmp(arg, "-p")) {
-			if (batch_check) {
-				error("git-cat-file: Can't use %s with --batch-check", arg);
+			if (batch || batch_check) {
+				error("git-cat-file: Can't use %s with %s", arg, batch ? "--batch" : "--batch-check");
 				usage(cat_file_usage);
 			}
 
@@ -223,8 +249,8 @@ int cmd_cat_file(int argc, const char **argv, const char *prefix)
 			usage(cat_file_usage);
 
 		if (!exp_type) {
-			if (batch_check) {
-				error("git-cat-file: Can't specify a type (\"%s\") with --batch-check", arg);
+			if (batch || batch_check) {
+				error("git-cat-file: Can't specify a type (\"%s\") with %s", arg, batch ? "--batch" : "--batch-check");
 				usage(cat_file_usage);
 			}
 
@@ -235,16 +261,17 @@ int cmd_cat_file(int argc, const char **argv, const char *prefix)
 		if (obj_name)
 			usage(cat_file_usage);
 
-		// We should have hit one of the earlier if (batch_check) cases before
+		// We should have hit one of the earlier if (batch || batch_check) cases before
 		// getting here.
+		assert(!batch);
 		assert(!batch_check);
 
 		obj_name = arg;
 		break;
 	}
 
-	if (batch_check)
-		return batch_objects();
+	if (batch || batch_check)
+		return batch_objects(batch);
 
 	if (!exp_type || !obj_name)
 		usage(cat_file_usage);
diff --git a/t/t1006-cat-file.sh b/t/t1006-cat-file.sh
index decba02740..d5696765b1 100755
--- a/t/t1006-cat-file.sh
+++ b/t/t1006-cat-file.sh
@@ -28,6 +28,9 @@ run_tests () {
     pretty_content=$5
     no_ts=$6
 
+    batch_output="$sha1 $type $size
+$content"
+
     test_expect_success "$type exists" '
 	git cat-file -e $sha1
     '
@@ -68,6 +71,20 @@ run_tests () {
         fi
     '
 
+    test -z "$content" ||
+    test_expect_success "--batch output of $type is correct" '
+	expect="$(maybe_remove_timestamp "$batch_output" $no_ts)"
+	actual="$(maybe_remove_timestamp "$(echo $sha1 | git cat-file --batch)" no_ts)"
+        if test "z$expect" = "z$actual"
+	then
+		: happy
+	else
+		echo "Oops: expected $expect"
+		echo "but got $actual"
+		false
+        fi
+    '
+
     test_expect_success "--batch-check output of $type is correct" '
 	expect="$sha1 $type $size"
 	actual="$(echo_without_newline $sha1 | git cat-file --batch-check)"
@@ -131,28 +148,31 @@ test_expect_success \
     "Reach a blob from a tag pointing to it" \
     "test '$hello_content' = \"\$(git cat-file blob $tag_sha1)\""
 
-for opt in t s e p
+for batch in batch batch-check
 do
-    test_expect_success "Passing -$opt with --batch-check fails" '
-	test_must_fail git cat-file --batch-check -$opt $hello_sha1
+    for opt in t s e p
+    do
+	test_expect_success "Passing -$opt with --$batch fails" '
+	    test_must_fail git cat-file --$batch -$opt $hello_sha1
+	'
+
+	test_expect_success "Passing --$batch with -$opt fails" '
+	    test_must_fail git cat-file -$opt --$batch $hello_sha1
+	'
+    done
+
+    test_expect_success "Passing <type> with --$batch fails" '
+	test_must_fail git cat-file --$batch blob $hello_sha1
     '
 
-    test_expect_success "Passing --batch-check with -$opt fails" '
-	test_must_fail git cat-file -$opt --batch-check $hello_sha1
+    test_expect_success "Passing --$batch with <type> fails" '
+	test_must_fail git cat-file blob --$batch $hello_sha1
     '
-done
-
-test_expect_success "Passing <type> with --batch-check fails" '
-    test_must_fail git cat-file --batch-check blob $hello_sha1
-'
-
-test_expect_success "Passing --batch-check with <type> fails" '
-    test_must_fail git cat-file blob --batch-check $hello_sha1
-'
 
-test_expect_success "Passing sha1 with --batch-check fails" '
-    test_must_fail git cat-file --batch-check $hello_sha1
-'
+    test_expect_success "Passing sha1 with --$batch fails" '
+	test_must_fail git cat-file --$batch $hello_sha1
+    '
+done
 
 test_expect_success "--batch-check for a non-existent object" '
     test "deadbeef missing" = \
@@ -163,6 +183,26 @@ test_expect_success "--batch-check for an emtpy line" '
     test " missing" = "$(echo | git cat-file --batch-check)"
 '
 
+batch_input="$hello_sha1
+$commit_sha1
+$tag_sha1
+deadbeef
+
+"
+
+batch_output="$hello_sha1 blob $hello_size
+$hello_content
+$commit_sha1 commit $commit_size
+$commit_content
+$tag_sha1 tag $tag_size
+$tag_content
+deadbeef missing
+ missing"
+
+test_expect_success \
+    "--batch with multiple sha1s gives correct format" \
+    "test \"\$(maybe_remove_timestamp \"$batch_output\" 1)\" = \"\$(maybe_remove_timestamp \"\$(echo_without_newline \"$batch_input\" | git cat-file --batch)\" 1)\""
+
 batch_check_input="$hello_sha1
 $tree_sha1
 $commit_sha1