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[PATCH] Add -B flag to diff-* brothers.

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A new diffcore transformation, diffcore-break.c, is introduced.

When the -B flag is given, a patch that represents a complete
rewrite is broken into a deletion followed by a creation.  This
makes it easier to review such a complete rewrite patch.

The -B flag takes the same syntax as the -M and -C flags to
specify the minimum amount of non-source material the resulting
file needs to have to be considered a complete rewrite, and
defaults to 99% if not specified.

As the new test t4008-diff-break-rewrite.sh demonstrates, if a
file is a complete rewrite, it is broken into a delete/create
pair, which can further be subjected to the usual rename
detection if -M or -C is used.  For example, if file0 gets
completely rewritten to make it as if it were rather based on
file1 which itself disappeared, the following happens:

    The original change looks like this:

	file0     --> file0' (quite different from file0)
	file1     --> /dev/null

    After diffcore-break runs, it would become this:

	file0     --> /dev/null
	/dev/null --> file0'
	file1     --> /dev/null

    Then diffcore-rename matches them up:

	file1     --> file0'

The internal score values are finer grained now.  Earlier
maximum of 10000 has been raised to 60000; there is no user
visible changes but there is no reason to waste available bits.

Signed-off-by: Junio C Hamano <junkio@cox.net>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Junio C Hamano
2005-05-30 00:08:37 -07:00
committed by Linus Torvalds
parent 2cd68882ee
commit f345b0a066
13 changed files with 433 additions and 29 deletions
Download Patch File Download Diff File Expand all files Collapse all files

11
diff-cache.c
View File

@ -9,6 +9,7 @@ static int diff_setup_opt = 0;
static int diff_score_opt = 0;
static const char *pickaxe = NULL;
static int pickaxe_opts = 0;
static int diff_break_opt = -1;
/* A file entry went away or appeared */
static void show_file(const char *prefix, struct cache_entry *ce, unsigned char *sha1, unsigned int mode)
@ -188,6 +189,10 @@ int main(int argc, const char **argv)
diff_output_format = DIFF_FORMAT_PATCH;
continue;
}
if (!strncmp(arg, "-B", 2)) {
diff_break_opt = diff_scoreopt_parse(arg);
continue;
}
if (!strncmp(arg, "-M", 2)) {
detect_rename = DIFF_DETECT_RENAME;
diff_score_opt = diff_scoreopt_parse(arg);
@ -240,9 +245,11 @@ int main(int argc, const char **argv)
die("unable to read tree object %s", tree_name);
ret = diff_cache(active_cache, active_nr);
diffcore_std(pathspec,
diffcore_std(pathspec ? : NULL,
detect_rename, diff_score_opt,
pickaxe, pickaxe_opts);
pickaxe, pickaxe_opts,
diff_break_opt);
diff_flush(diff_output_format, 1);
return ret;
}