[PATCH] Rework -B output.
Patch for a completely rewritten file detected by the -B flag
was shown as a pair of creation followed by deletion in earlier
versions. This was an misguided attempt to make reviewing such
a complete rewrite easier, and unnecessarily ended up confusing
git-apply. Instead, show the entire contents of old version
prefixed with '-', followed by the entire contents of new
version prefixed with '+'. This gives the same easy-to-review
for human consumer while keeping it a single, regular
modification patch for machine consumption, something that even
GNU patch can grok.
Signed-off-by: Junio C Hamano <junkio@cox.net>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/diff.c b/diff.c
index e993601..5cb340c 100644
--- a/diff.c
+++ b/diff.c
@@ -83,10 +83,88 @@
char tmp_path[50];
} diff_temp[2];
+static int count_lines(const char *filename)
+{
+ FILE *in;
+ int count, ch, completely_empty = 1, nl_just_seen = 0;
+ in = fopen(filename, "r");
+ count = 0;
+ while ((ch = fgetc(in)) != EOF)
+ if (ch == '\n') {
+ count++;
+ nl_just_seen = 1;
+ completely_empty = 0;
+ }
+ else {
+ nl_just_seen = 0;
+ completely_empty = 0;
+ }
+ fclose(in);
+ if (completely_empty)
+ return 0;
+ if (!nl_just_seen)
+ count++; /* no trailing newline */
+ return count;
+}
+
+static void print_line_count(int count)
+{
+ switch (count) {
+ case 0:
+ printf("0,0");
+ break;
+ case 1:
+ printf("1");
+ break;
+ default:
+ printf("1,%d", count);
+ break;
+ }
+}
+
+static void copy_file(int prefix, const char *filename)
+{
+ FILE *in;
+ int ch, nl_just_seen = 1;
+ in = fopen(filename, "r");
+ while ((ch = fgetc(in)) != EOF) {
+ if (nl_just_seen)
+ putchar(prefix);
+ putchar(ch);
+ if (ch == '\n')
+ nl_just_seen = 1;
+ else
+ nl_just_seen = 0;
+ }
+ fclose(in);
+ if (!nl_just_seen)
+ printf("\n\\ No newline at end of file\n");
+}
+
+static void emit_rewrite_diff(const char *name_a,
+ const char *name_b,
+ struct diff_tempfile *temp)
+{
+ /* Use temp[i].name as input, name_a and name_b as labels */
+ int lc_a, lc_b;
+ lc_a = count_lines(temp[0].name);
+ lc_b = count_lines(temp[1].name);
+ printf("--- %s\n+++ %s\n@@ -", name_a, name_b);
+ print_line_count(lc_a);
+ printf(" +");
+ print_line_count(lc_b);
+ printf(" @@\n");
+ if (lc_a)
+ copy_file('-', temp[0].name);
+ if (lc_b)
+ copy_file('+', temp[1].name);
+}
+
static void builtin_diff(const char *name_a,
const char *name_b,
struct diff_tempfile *temp,
- const char *xfrm_msg)
+ const char *xfrm_msg,
+ int complete_rewrite)
{
int i, next_at, cmd_size;
const char *diff_cmd = "diff -L'%s%s' -L'%s%s'";
@@ -149,12 +227,16 @@
}
if (xfrm_msg && xfrm_msg[0])
puts(xfrm_msg);
-
if (strncmp(temp[0].mode, temp[1].mode, 3))
/* we do not run diff between different kind
* of objects.
*/
exit(0);
+ if (complete_rewrite) {
+ fflush(NULL);
+ emit_rewrite_diff(name_a, name_b, temp);
+ exit(0);
+ }
}
fflush(NULL);
execlp("/bin/sh","sh", "-c", cmd, NULL);
@@ -474,7 +556,8 @@
const char *other,
struct diff_filespec *one,
struct diff_filespec *two,
- const char *xfrm_msg)
+ const char *xfrm_msg,
+ int complete_rewrite)
{
struct diff_tempfile *temp = diff_temp;
pid_t pid;
@@ -524,7 +607,8 @@
* otherwise we use the built-in one.
*/
if (one && two)
- builtin_diff(name, other ? : name, temp, xfrm_msg);
+ builtin_diff(name, other ? : name, temp, xfrm_msg,
+ complete_rewrite);
else
printf("* Unmerged path %s\n", name);
exit(0);
@@ -547,29 +631,75 @@
remove_tempfile();
}
-static void run_diff(const char *name,
- const char *other,
- struct diff_filespec *one,
- struct diff_filespec *two,
- const char *xfrm_msg)
+static void run_diff(struct diff_filepair *p)
{
const char *pgm = external_diff();
+ char msg_[PATH_MAX*2+200], *xfrm_msg;
+ struct diff_filespec *one;
+ struct diff_filespec *two;
+ const char *name;
+ const char *other;
+ int complete_rewrite = 0;
+
+ if (DIFF_PAIR_UNMERGED(p)) {
+ /* unmerged */
+ run_external_diff(pgm, p->one->path, NULL, NULL, NULL, NULL,
+ 0);
+ return;
+ }
+
+ name = p->one->path;
+ other = (strcmp(name, p->two->path) ? p->two->path : NULL);
+ one = p->one; two = p->two;
+ switch (p->status) {
+ case 'C':
+ sprintf(msg_,
+ "similarity index %d%%\n"
+ "copy from %s\n"
+ "copy to %s",
+ (int)(0.5 + p->score * 100.0/MAX_SCORE),
+ name, other);
+ xfrm_msg = msg_;
+ break;
+ case 'R':
+ sprintf(msg_,
+ "similarity index %d%%\n"
+ "rename from %s\n"
+ "rename to %s",
+ (int)(0.5 + p->score * 100.0/MAX_SCORE),
+ name, other);
+ xfrm_msg = msg_;
+ break;
+ case 'M':
+ if (p->score) {
+ sprintf(msg_,
+ "dissimilarity index %d%%",
+ (int)(0.5 + p->score * 100.0/MAX_SCORE));
+ xfrm_msg = msg_;
+ complete_rewrite = 1;
+ break;
+ }
+ /* fallthru */
+ default:
+ xfrm_msg = NULL;
+ }
+
if (!pgm &&
- one && two &&
DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
(S_IFMT & one->mode) != (S_IFMT & two->mode)) {
/* a filepair that changes between file and symlink
* needs to be split into deletion and creation.
*/
struct diff_filespec *null = alloc_filespec(two->path);
- run_external_diff(NULL, name, other, one, null, xfrm_msg);
+ run_external_diff(NULL, name, other, one, null, xfrm_msg, 0);
free(null);
null = alloc_filespec(one->path);
- run_external_diff(NULL, name, other, null, two, xfrm_msg);
+ run_external_diff(NULL, name, other, null, two, xfrm_msg, 0);
free(null);
}
else
- run_external_diff(pgm, name, other, one, two, xfrm_msg);
+ run_external_diff(pgm, name, other, one, two, xfrm_msg,
+ complete_rewrite);
}
void diff_setup(int flags)
@@ -693,26 +823,22 @@
die(err, p->two->path);
}
+ if (p->score)
+ sprintf(status, "%c%03d", p->status,
+ (int)(0.5 + p->score * 100.0/MAX_SCORE));
+ else {
+ status[0] = p->status;
+ status[1] = 0;
+ }
switch (p->status) {
case 'C': case 'R':
two_paths = 1;
- sprintf(status, "%c%03d", p->status,
- (int)(0.5 + p->score * 100.0/MAX_SCORE));
break;
case 'N': case 'D':
two_paths = 0;
- if (p->score)
- sprintf(status, "%c%03d", p->status,
- (int)(0.5 + p->score * 100.0/MAX_SCORE));
- else {
- status[0] = p->status;
- status[1] = 0;
- }
break;
default:
two_paths = 0;
- status[0] = p->status;
- status[1] = 0;
break;
}
printf(":%06o %06o %s ",
@@ -763,55 +889,14 @@
static void diff_flush_patch(struct diff_filepair *p)
{
- const char *name, *other;
- char msg_[PATH_MAX*2+200], *msg;
-
if (diff_unmodified_pair(p))
return;
- name = p->one->path;
- other = (strcmp(name, p->two->path) ? p->two->path : NULL);
if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
(DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
return; /* no tree diffs in patch format */
- switch (p->status) {
- case 'C':
- sprintf(msg_,
- "similarity index %d%%\n"
- "copy from %s\n"
- "copy to %s",
- (int)(0.5 + p->score * 100.0/MAX_SCORE),
- p->one->path, p->two->path);
- msg = msg_;
- break;
- case 'R':
- sprintf(msg_,
- "similarity index %d%%\n"
- "rename from %s\n"
- "rename to %s",
- (int)(0.5 + p->score * 100.0/MAX_SCORE),
- p->one->path, p->two->path);
- msg = msg_;
- break;
- case 'D': case 'N':
- if (DIFF_PAIR_BROKEN(p)) {
- sprintf(msg_,
- "dissimilarity index %d%%",
- (int)(0.5 + p->score * 100.0/MAX_SCORE));
- msg = msg_;
- }
- else
- msg = NULL;
- break;
- default:
- msg = NULL;
- }
-
- if (DIFF_PAIR_UNMERGED(p))
- run_diff(name, NULL, NULL, NULL, NULL);
- else
- run_diff(name, other, p->one, p->two, msg);
+ run_diff(p);
}
int diff_queue_is_empty(void)
@@ -972,8 +1057,10 @@
int found;
for (i = found = 0; !found && i < q->nr; i++) {
struct diff_filepair *p = q->queue[i];
- if ((p->broken_pair && strchr(filter, 'B')) ||
- (!p->broken_pair && strchr(filter, p->status)))
+ if (((p->status == 'M') &&
+ ((p->score && strchr(filter, 'B')) ||
+ (!p->score && strchr(filter, 'M')))) ||
+ ((p->status != 'M') && strchr(filter, p->status)))
found++;
}
if (found)
@@ -991,8 +1078,10 @@
/* Only the matching ones */
for (i = 0; i < q->nr; i++) {
struct diff_filepair *p = q->queue[i];
- if ((p->broken_pair && strchr(filter, 'B')) ||
- (!p->broken_pair && strchr(filter, p->status)))
+ if (((p->status == 'M') &&
+ ((p->score && strchr(filter, 'B')) ||
+ (!p->score && strchr(filter, 'M')))) ||
+ ((p->status != 'M') && strchr(filter, p->status)))
diff_q(&outq, p);
else
diff_free_filepair(p);
