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-rw-r--r--Documentation/diffcore.txt9
-rw-r--r--diff.c229
-rw-r--r--diffcore-break.c7
-rw-r--r--t/t4008-diff-break-rewrite.sh36
4 files changed, 186 insertions, 95 deletions
diff --git a/Documentation/diffcore.txt b/Documentation/diffcore.txt
index 7627453..6c474d1 100644
--- a/Documentation/diffcore.txt
+++ b/Documentation/diffcore.txt
@@ -191,6 +191,15 @@ like these:
-B/60 (the same as above, since diffcore-break defautls to
50%).
+Note that earlier implementation left a broken pair as a separate
+creation and deletion patches. This was unnecessary hack and
+the latest implementation always merges all the broken pairs
+back into modifications, but the resulting patch output is
+formatted differently to still let the reviewing easier for such
+a complete rewrite by showing the entire contents of old version
+prefixed with '-', followed by the entire contents of new
+version prefixed with '+'.
+
diffcore-pickaxe
----------------
diff --git a/diff.c b/diff.c
index e993601..5cb340c 100644
--- a/diff.c
+++ b/diff.c
@@ -83,10 +83,88 @@ static struct diff_tempfile {
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 @@ static void builtin_diff(const char *name_a,
}
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 @@ static void run_external_diff(const char *pgm,
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 @@ static void run_external_diff(const char *pgm,
* 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 @@ static void run_external_diff(const char *pgm,
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 @@ static void diff_flush_raw(struct diff_filepair *p,
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 @@ int diff_unmodified_pair(struct diff_filepair *p)
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 @@ static void diffcore_apply_filter(const char *filter)
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 @@ static void diffcore_apply_filter(const char *filter)
/* 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);
diff --git a/diffcore-break.c b/diffcore-break.c
index 082e4e5..920062b 100644
--- a/diffcore-break.c
+++ b/diffcore-break.c
@@ -214,7 +214,7 @@ static void merge_broken(struct diff_filepair *p,
struct diff_queue_struct *outq)
{
/* p and pp are broken pairs we want to merge */
- struct diff_filepair *c = p, *d = pp;
+ struct diff_filepair *c = p, *d = pp, *dp;
if (DIFF_FILE_VALID(p->one)) {
/* this must be a delete half */
d = p; c = pp;
@@ -229,7 +229,8 @@ static void merge_broken(struct diff_filepair *p,
if (!DIFF_FILE_VALID(c->two))
die("internal error in merge #4");
- diff_queue(outq, d->one, c->two);
+ dp = diff_queue(outq, d->one, c->two);
+ dp->score = p->score;
diff_free_filespec_data(d->two);
diff_free_filespec_data(c->one);
free(d);
@@ -251,7 +252,6 @@ void diffcore_merge_broken(void)
/* we already merged this with its peer */
continue;
else if (p->broken_pair &&
- p->score == 0 &&
!strcmp(p->one->path, p->two->path)) {
/* If the peer also survived rename/copy, then
* we merge them back together.
@@ -259,7 +259,6 @@ void diffcore_merge_broken(void)
for (j = i + 1; j < q->nr; j++) {
struct diff_filepair *pp = q->queue[j];
if (pp->broken_pair &&
- p->score == 0 &&
!strcmp(pp->one->path, pp->two->path) &&
!strcmp(p->one->path, pp->two->path)) {
/* Peer survived. Merge them */
diff --git a/t/t4008-diff-break-rewrite.sh b/t/t4008-diff-break-rewrite.sh
index 94205b9..040d0dd 100644
--- a/t/t4008-diff-break-rewrite.sh
+++ b/t/t4008-diff-break-rewrite.sh
@@ -44,13 +44,12 @@ test_expect_success \
cat >expected <<\EOF
:100644 000000 f5deac7be59e7eeab8657fd9ae706fd6a57daed2 0000000000000000000000000000000000000000 D file0
-:100644 000000 6ff87c4664981e4397625791c8ea3bbb5f2279a3 0000000000000000000000000000000000000000 D100 file1
-:000000 100644 0000000000000000000000000000000000000000 11e331465a89c394dc25c780de230043750c1ec8 N100 file1
+:100644 100644 6ff87c4664981e4397625791c8ea3bbb5f2279a3 11e331465a89c394dc25c780de230043750c1ec8 M100 file1
EOF
test_expect_success \
'validate result of -B (#1)' \
- 'compare_diff_raw current expected'
+ 'compare_diff_raw expected current'
test_expect_success \
'run diff with -B and -M' \
@@ -62,7 +61,7 @@ EOF
test_expect_success \
'validate result of -B -M (#2)' \
- 'compare_diff_raw current expected'
+ 'compare_diff_raw expected current'
test_expect_success \
'swap file0 and file1' \
@@ -79,15 +78,13 @@ test_expect_success \
'git-diff-cache -B "$tree" >current'
cat >expected <<\EOF
-:100644 000000 f5deac7be59e7eeab8657fd9ae706fd6a57daed2 0000000000000000000000000000000000000000 D100 file0
-:000000 100644 0000000000000000000000000000000000000000 6ff87c4664981e4397625791c8ea3bbb5f2279a3 N100 file0
-:100644 000000 6ff87c4664981e4397625791c8ea3bbb5f2279a3 0000000000000000000000000000000000000000 D100 file1
-:000000 100644 0000000000000000000000000000000000000000 f5deac7be59e7eeab8657fd9ae706fd6a57daed2 N100 file1
+:100644 100644 f5deac7be59e7eeab8657fd9ae706fd6a57daed2 6ff87c4664981e4397625791c8ea3bbb5f2279a3 M100 file0
+:100644 100644 6ff87c4664981e4397625791c8ea3bbb5f2279a3 f5deac7be59e7eeab8657fd9ae706fd6a57daed2 M100 file1
EOF
test_expect_success \
'validate result of -B (#3)' \
- 'compare_diff_raw current expected'
+ 'compare_diff_raw expected current'
test_expect_success \
'run diff with -B and -M' \
@@ -100,7 +97,7 @@ EOF
test_expect_success \
'validate result of -B -M (#4)' \
- 'compare_diff_raw current expected'
+ 'compare_diff_raw expected current'
test_expect_success \
'make file0 into something completely different' \
@@ -114,13 +111,12 @@ test_expect_success \
cat >expected <<\EOF
:100644 120000 f5deac7be59e7eeab8657fd9ae706fd6a57daed2 67be421f88824578857624f7b3dc75e99a8a1481 T file0
-:100644 000000 6ff87c4664981e4397625791c8ea3bbb5f2279a3 0000000000000000000000000000000000000000 D100 file1
-:000000 100644 0000000000000000000000000000000000000000 f5deac7be59e7eeab8657fd9ae706fd6a57daed2 N100 file1
+:100644 100644 6ff87c4664981e4397625791c8ea3bbb5f2279a3 f5deac7be59e7eeab8657fd9ae706fd6a57daed2 M100 file1
EOF
test_expect_success \
'validate result of -B (#5)' \
- 'compare_diff_raw current expected'
+ 'compare_diff_raw expected current'
test_expect_success \
'run diff with -B' \
@@ -130,13 +126,12 @@ test_expect_success \
# due to type differences.
cat >expected <<\EOF
:100644 120000 f5deac7be59e7eeab8657fd9ae706fd6a57daed2 67be421f88824578857624f7b3dc75e99a8a1481 T file0
-:100644 000000 6ff87c4664981e4397625791c8ea3bbb5f2279a3 0000000000000000000000000000000000000000 D100 file1
-:000000 100644 0000000000000000000000000000000000000000 f5deac7be59e7eeab8657fd9ae706fd6a57daed2 N100 file1
+:100644 100644 6ff87c4664981e4397625791c8ea3bbb5f2279a3 f5deac7be59e7eeab8657fd9ae706fd6a57daed2 M100 file1
EOF
test_expect_success \
'validate result of -B -M (#6)' \
- 'compare_diff_raw current expected'
+ 'compare_diff_raw expected current'
test_expect_success \
'run diff with -M' \
@@ -151,7 +146,7 @@ EOF
test_expect_success \
'validate result of -M (#7)' \
- 'compare_diff_raw current expected'
+ 'compare_diff_raw expected current'
test_expect_success \
'file1 edited to look like file0 and file0 rename-edited to file2' \
@@ -169,14 +164,13 @@ test_expect_success \
cat >expected <<\EOF
:100644 000000 f5deac7be59e7eeab8657fd9ae706fd6a57daed2 0000000000000000000000000000000000000000 D file0
-:100644 000000 6ff87c4664981e4397625791c8ea3bbb5f2279a3 0000000000000000000000000000000000000000 D100 file1
-:000000 100644 0000000000000000000000000000000000000000 08bb2fb671deff4c03a4d4a0a1315dff98d5732c N100 file1
+:100644 100644 6ff87c4664981e4397625791c8ea3bbb5f2279a3 08bb2fb671deff4c03a4d4a0a1315dff98d5732c M100 file1
:000000 100644 0000000000000000000000000000000000000000 f5deac7be59e7eeab8657fd9ae706fd6a57daed2 N file2
EOF
test_expect_success \
'validate result of -B (#8)' \
- 'compare_diff_raw current expected'
+ 'compare_diff_raw expected current'
test_expect_success \
'run diff with -B -M' \
@@ -189,6 +183,6 @@ EOF
test_expect_success \
'validate result of -B -M (#9)' \
- 'compare_diff_raw current expected'
+ 'compare_diff_raw expected current'
test_done