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Teach git diff-tree --stdin to diff trees

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When feeding trees on the command line, you can give exactly two
trees, not three nor one; --stdin now supports this "two tree" form on
its input, in addition to accepting lines with one or more commits.

When diffing trees (either specified on the command line or from the
standard input), the -s, -v, --pretty, --abbrev-commit, --encoding,
--no-commit-id, and --always options are ignored, since they do not
apply to trees; and the -m, -c, and --cc options are ignored since
they would be meaningful only with three or more trees, which is not
supported (yet).

Signed-off-by: Karl Hasselström <kha@treskal.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Karl Hasselström 2008-08-10 18:12:58 +02:00 committed by Junio C Hamano
parent 7cccfaa280
commit 140b378d07
2 changed files with 39 additions and 9 deletions
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15
Documentation/git-diff-tree.txt
View File

@ -49,17 +49,22 @@ include::diff-options.txt[]
--stdin::
When '--stdin' is specified, the command does not take
<tree-ish> arguments from the command line. Instead, it
reads either one <commit> or a list of <commit>
separated with a single space from its standard input.
reads lines containing either two <tree>, one <commit>, or a
list of <commit> from its standard input. (Use a single space
as separator.)
+
When two trees are given, it compares the first tree with the second.
When a single commit is given, it compares the commit with its
parents. The remaining commits, when given, are used as if they are
parents of the first commit.
+
The ID of the first (or only) commit, followed by a newline, is
printed before the differences.
When comparing two trees, the ID of both trees (separated by a space
and terminated by a newline) is printed before the difference. When
comparing commits, the ID of the first (or only) commit, followed by a
newline, is printed.
+
The following flags further affects its behavior.
The following flags further affects the behavior when comparing
commits (but not trees).
-m::
By default, 'git-diff-tree --stdin' does not show

33
builtin-diff-tree.c
View File

@ -42,21 +42,46 @@ static int stdin_diff_commit(struct commit *commit, char *line, int len)
return log_tree_commit(&log_tree_opt, commit);
}
/* Diff two trees. */
static int stdin_diff_trees(struct tree *tree1, char *line, int len)
{
unsigned char sha1[20];
struct tree *tree2;
if (len != 82 || !isspace(line[40]) || get_sha1_hex(line + 41, sha1))
return error("Need exactly two trees, separated by a space");
tree2 = lookup_tree(sha1);
if (!tree2 || parse_tree(tree2))
return -1;
printf("%s %s\n", sha1_to_hex(tree1->object.sha1),
sha1_to_hex(tree2->object.sha1));
diff_tree_sha1(tree1->object.sha1, tree2->object.sha1,
"", &log_tree_opt.diffopt);
log_tree_diff_flush(&log_tree_opt);
return 0;
}
static int diff_tree_stdin(char *line)
{
int len = strlen(line);
unsigned char sha1[20];
struct commit *commit;
struct object *obj;
if (!len || line[len-1] != '\n')
return -1;
line[len-1] = 0;
if (get_sha1_hex(line, sha1))
return -1;
commit = lookup_commit(sha1);
if (!commit || parse_commit(commit))
obj = lookup_object(sha1);
obj = obj ? obj : parse_object(sha1);
if (!obj)
return -1;
return stdin_diff_commit(commit, line, len);
if (obj->type == OBJ_COMMIT)
return stdin_diff_commit((struct commit *)obj, line, len);
if (obj->type == OBJ_TREE)
return stdin_diff_trees((struct tree *)obj, line, len);
error("Object %s is a %s, not a commit or tree",
sha1_to_hex(sha1), typename(obj->type));
return -1;
}
static const char diff_tree_usage[] =