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[PATCH] Introducing software archaeologist's tool "pickaxe".

Browse Source 
This steals the "pickaxe" feature from JIT and make it available
to the bare Plumbing layer.  From the command line, the user
gives a string he is intersted in.

Using the diff-core infrastructure previously introduced, it
filters the differences to limit the output only to the diffs
between <src> and <dst> where the string appears only in one but
not in the other.  For example:

 $ ./git-rev-list HEAD | ./git-diff-tree -Sdiff-tree-helper --stdin -M

would show the diffs that touch the string "diff-tree-helper".

In real software-archaeologist application, you would typically
look for a few to several lines of code and see where that code
came from.

The "pickaxe" module runs after "rename/copy detection" module,
so it even crosses the file rename boundary, as the above
example demonstrates.

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
2005-05-21 02:40:01 -07:00
committed by Linus Torvalds
parent 427dcb4bca
commit 52e9578985
14 changed files with 140 additions and 51 deletions
Download Patch File Download Diff File Expand all files Collapse all files

29
diffcore-rename.c
View File

@ -129,7 +129,7 @@ static void record_rename_pair(struct diff_queue_struct *outq,
* To achieve this sort order, we give xform_work the number
* above.
*/
struct diff_file_pair *dp = diff_queue(outq, src, dst);
struct diff_filepair *dp = diff_queue(outq, src, dst);
dp->xfrm_work = (rank * 2 + 1) | (score<<RENAME_SCORE_SHIFT);
dst->xfrm_flags |= RENAME_DST_MATCHED;
}
@ -148,7 +148,7 @@ static void debug_filespec(struct diff_filespec *s, int x, const char *one)
s->size, s->xfrm_flags);
}
static void debug_filepair(const struct diff_file_pair *p, int i)
static void debug_filepair(const struct diff_filepair *p, int i)
{
debug_filespec(p->one, i, "one");
debug_filespec(p->two, i, "two");
@ -165,7 +165,7 @@ static void debug_queue(const char *msg, struct diff_queue_struct *q)
fprintf(stderr, "%s\n", msg);
fprintf(stderr, "q->nr = %d\n", q->nr);
for (i = 0; i < q->nr; i++) {
struct diff_file_pair *p = q->queue[i];
struct diff_filepair *p = q->queue[i];
debug_filepair(p, i);
}
}
@ -180,8 +180,8 @@ static void debug_queue(const char *msg, struct diff_queue_struct *q)
*/
static int rank_compare(const void *a_, const void *b_)
{
const struct diff_file_pair *a = *(const struct diff_file_pair **)a_;
const struct diff_file_pair *b = *(const struct diff_file_pair **)b_;
const struct diff_filepair *a = *(const struct diff_filepair **)a_;
const struct diff_filepair *b = *(const struct diff_filepair **)b_;
int a_rank = a->xfrm_work & ((1<<RENAME_SCORE_SHIFT) - 1);
int b_rank = b->xfrm_work & ((1<<RENAME_SCORE_SHIFT) - 1);
@ -207,7 +207,7 @@ static int needs_to_stay(struct diff_queue_struct *q, int i,
* as the source of rename/copy), we need to copy, not rename.
*/
while (i < q->nr) {
struct diff_file_pair *p = q->queue[i++];
struct diff_filepair *p = q->queue[i++];
if (!p->two->file_valid)
continue; /* removed is fine */
if (strcmp(p->one->path, it->path))
@ -243,15 +243,8 @@ void diff_detect_rename(struct diff_queue_struct *q,
srcs[0] = &deleted;
srcs[1] = &stay;
/* NEEDSWORK:
* (1) make sure we properly ignore but pass trees.
*
* (2) make sure we do right thing on the same path deleted
* and created in the same patch.
*/
for (i = 0; i < q->nr; i++) {
struct diff_file_pair *p = q->queue[i];
struct diff_filepair *p = q->queue[i];
if (!p->one->file_valid)
if (!p->two->file_valid)
continue; /* ignore nonsense */
@ -340,11 +333,11 @@ void diff_detect_rename(struct diff_queue_struct *q,
* See comments at the top of record_rename_pair for numbers used
* to assign xfrm_work.
*
* Note that we have not annotated the diff_file_pair with any comment
* Note that we have not annotated the diff_filepair with any comment
* so there is nothing other than p to free.
*/
for (i = 0; i < q->nr; i++) {
struct diff_file_pair *dp, *p = q->queue[i];
struct diff_filepair *dp, *p = q->queue[i];
if (!p->one->file_valid) {
if (p->two->file_valid) {
/* creation */
@ -378,7 +371,7 @@ void diff_detect_rename(struct diff_queue_struct *q,
/* Copy it out to q, removing duplicates. */
for (i = 0; i < outq.nr; i++) {
struct diff_file_pair *p = outq.queue[i];
struct diff_filepair *p = outq.queue[i];
if (!p->one->file_valid) {
/* created */
if (p->two->xfrm_flags & RENAME_DST_MATCHED)
@ -395,7 +388,7 @@ void diff_detect_rename(struct diff_queue_struct *q,
}
else if (strcmp(p->one->path, p->two->path)) {
/* rename or copy */
struct diff_file_pair *dp =
struct diff_filepair *dp =
diff_queue(q, p->one, p->two);
int msglen = (strlen(p->one->path) +
strlen(p->two->path) + 100);