Revert "cat-file: split --batch input lines on whitespace"

This reverts commit c334b87b30c1464a1ab563fe1fb8de5eaf0e5bac; the
update assumed that people only used the command to read from
"rev-list --objects" output, whose lines begin with a 40-hex object
name followed by a whitespace, but it turns out that scripts feed
random extended SHA-1 expressions (e.g. "HEAD:$pathname") in which
a whitespace has to be kept.

Documentation/git-cat-file.txt

@@ -88,10 +88,8 @@ BATCH OUTPUT
 If `--batch` or `--batch-check` is given, `cat-file` will read objects
 from stdin, one per line, and print information about them.
 
-Each line is split at the first whitespace boundary. All characters
-before that whitespace are considered as a whole object name, and are
-parsed as if given to linkgit:git-rev-parse[1]. Characters after that
-whitespace can be accessed using the `%(rest)` atom (see below).
+Each line is considered as a whole object name, and is parsed as if
+given to linkgit:git-rev-parse[1].
 
 You can specify the information shown for each object by using a custom
 `<format>`. The `<format>` is copied literally to stdout for each
@@ -112,10 +110,6 @@ newline. The available atoms are:
 	The size, in bytes, that the object takes up on disk. See the
 	note about on-disk sizes in the `CAVEATS` section below.
 
-`rest`::
-	The text (if any) found after the first run of whitespace on the
-	input line (i.e., the "rest" of the line).
-
 If no format is specified, the default format is `%(objectname)
 %(objecttype) %(objectsize)`.
 

builtin/cat-file.c

@@ -119,7 +119,6 @@ struct expand_data {
 	enum object_type type;
 	unsigned long size;
 	unsigned long disk_size;
-	const char *rest;
 
 	/*
 	 * If mark_query is true, we do not expand anything, but rather
@@ -164,9 +163,6 @@ static void expand_atom(struct strbuf *sb, const char *atom, int len,
 			data->info.disk_sizep = &data->disk_size;
 		else
 			strbuf_addf(sb, "%lu", data->disk_size);
-	} else if (is_atom("rest", atom, len)) {
-		if (!data->mark_query && data->rest)
-			strbuf_addstr(sb, data->rest);
 	} else
 		die("unknown format element: %.*s", len, atom);
 }
@@ -277,21 +273,7 @@ static int batch_objects(struct batch_options *opt)
 	warn_on_object_refname_ambiguity = 0;
 
 	while (strbuf_getline(&buf, stdin, '\n') != EOF) {
-		char *p;
-		int error;
-
-		/*
-		 * Split at first whitespace, tying off the beginning of the
-		 * string and saving the remainder (or NULL) in data.rest.
-		 */
-		p = strpbrk(buf.buf, " \t");
-		if (p) {
-			while (*p && strchr(" \t", *p))
-				*p++ = '\0';
-		}
-		data.rest = p;
-
-		error = batch_one_object(buf.buf, opt, &data);
+		int error = batch_one_object(buf.buf, opt, &data);
 		if (error)
 			return error;
 	}

t/t1006-cat-file.sh

@@ -78,13 +78,6 @@ $content"
 	echo $sha1 | git cat-file --batch-check="%(objecttype) %(objectname)" >actual &&
 	test_cmp expect actual
     '
-
-    test_expect_success '--batch-check with %(rest)' '
-	echo "$type this is some extra content" >expect &&
-	echo "$sha1    this is some extra content" |
-		git cat-file --batch-check="%(objecttype) %(rest)" >actual &&
-	test_cmp expect actual
-    '
 }
 
 hello_content="Hello World"