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git/builtin/blame.c
Junio C Hamano 37e9c7f5e1 Merge branch 'mh/blame-worktree' 
"git blame file" allowed the lineage of lines in the uncommitted,
unadded contents of "file" to be inspected, but it refused when
"file" did not appear in the current commit.  When "file" was
created by renaming an existing file (but the change has not been
committed), this restriction was unnecessarily tight.

* mh/blame-worktree:
  t/t8003-blame-corner-cases.sh: Use here documents
  blame: allow to blame paths freshly added to the index
2016-07-25 14:13:45 -07:00

2889 lines
77 KiB
C
Raw Blame History

/*
* Blame
*
* Copyright (c) 2006, 2014 by its authors
* See COPYING for licensing conditions
*/
#include "cache.h"
#include "refs.h"
#include "builtin.h"
#include "blob.h"
#include "commit.h"
#include "tag.h"
#include "tree-walk.h"
#include "diff.h"
#include "diffcore.h"
#include "revision.h"
#include "quote.h"
#include "xdiff-interface.h"
#include "cache-tree.h"
#include "string-list.h"
#include "mailmap.h"
#include "mergesort.h"
#include "parse-options.h"
#include "prio-queue.h"
#include "utf8.h"
#include "userdiff.h"
#include "line-range.h"
#include "line-log.h"
#include "dir.h"
#include "progress.h"
static char blame_usage[] = N_("git blame [<options>] [<rev-opts>] [<rev>] [--] <file>");
static const char *blame_opt_usage[] = {
blame_usage,
"",
N_("<rev-opts> are documented in git-rev-list(1)"),
NULL
};
static int longest_file;
static int longest_author;
static int max_orig_digits;
static int max_digits;
static int max_score_digits;
static int show_root;
static int reverse;
static int blank_boundary;
static int incremental;
static int xdl_opts;
static int abbrev = -1;
static int no_whole_file_rename;
static int show_progress;
static struct date_mode blame_date_mode = { DATE_ISO8601 };
static size_t blame_date_width;
static struct string_list mailmap = STRING_LIST_INIT_NODUP;
#ifndef DEBUG
#define DEBUG 0
#endif
/* stats */
static int num_read_blob;
static int num_get_patch;
static int num_commits;
#define PICKAXE_BLAME_MOVE 01
#define PICKAXE_BLAME_COPY 02
#define PICKAXE_BLAME_COPY_HARDER 04
#define PICKAXE_BLAME_COPY_HARDEST 010
/*
* blame for a blame_entry with score lower than these thresholds
* is not passed to the parent using move/copy logic.
*/
static unsigned blame_move_score;
static unsigned blame_copy_score;
#define BLAME_DEFAULT_MOVE_SCORE 20
#define BLAME_DEFAULT_COPY_SCORE 40
/* Remember to update object flag allocation in object.h */
#define METAINFO_SHOWN (1u<<12)
#define MORE_THAN_ONE_PATH (1u<<13)
/*
* One blob in a commit that is being suspected
*/
struct origin {
int refcnt;
/* Record preceding blame record for this blob */
struct origin *previous;
/* origins are put in a list linked via `next' hanging off the
* corresponding commit's util field in order to make finding
* them fast. The presence in this chain does not count
* towards the origin's reference count. It is tempting to
* let it count as long as the commit is pending examination,
* but even under circumstances where the commit will be
* present multiple times in the priority queue of unexamined
* commits, processing the first instance will not leave any
* work requiring the origin data for the second instance. An
* interspersed commit changing that would have to be
* preexisting with a different ancestry and with the same
* commit date in order to wedge itself between two instances
* of the same commit in the priority queue _and_ produce
* blame entries relevant for it. While we don't want to let
* us get tripped up by this case, it certainly does not seem
* worth optimizing for.
*/
struct origin *next;
struct commit *commit;
/* `suspects' contains blame entries that may be attributed to
* this origin's commit or to parent commits. When a commit
* is being processed, all suspects will be moved, either by
* assigning them to an origin in a different commit, or by
* shipping them to the scoreboard's ent list because they
* cannot be attributed to a different commit.
*/
struct blame_entry *suspects;
mmfile_t file;
unsigned char blob_sha1[20];
unsigned mode;
/* guilty gets set when shipping any suspects to the final
* blame list instead of other commits
*/
char guilty;
char path[FLEX_ARRAY];
};
struct progress_info {
struct progress *progress;
int blamed_lines;
};
static int diff_hunks(mmfile_t *file_a, mmfile_t *file_b,
xdl_emit_hunk_consume_func_t hunk_func, void *cb_data)
{
xpparam_t xpp = {0};
xdemitconf_t xecfg = {0};
xdemitcb_t ecb = {NULL};
xpp.flags = xdl_opts;
xecfg.hunk_func = hunk_func;
ecb.priv = cb_data;
return xdi_diff(file_a, file_b, &xpp, &xecfg, &ecb);
}
/*
* Prepare diff_filespec and convert it using diff textconv API
* if the textconv driver exists.
* Return 1 if the conversion succeeds, 0 otherwise.
*/
int textconv_object(const char *path,
unsigned mode,
const unsigned char *sha1,
int sha1_valid,
char **buf,
unsigned long *buf_size)
{
struct diff_filespec *df;
struct userdiff_driver *textconv;
df = alloc_filespec(path);
fill_filespec(df, sha1, sha1_valid, mode);
textconv = get_textconv(df);
if (!textconv) {
free_filespec(df);
return 0;
}
*buf_size = fill_textconv(textconv, df, buf);
free_filespec(df);
return 1;
}
/*
* Given an origin, prepare mmfile_t structure to be used by the
* diff machinery
*/
static void fill_origin_blob(struct diff_options *opt,
struct origin *o, mmfile_t *file)
{
if (!o->file.ptr) {
enum object_type type;
unsigned long file_size;
num_read_blob++;
if (DIFF_OPT_TST(opt, ALLOW_TEXTCONV) &&
textconv_object(o->path, o->mode, o->blob_sha1, 1, &file->ptr, &file_size))
;
else
file->ptr = read_sha1_file(o->blob_sha1, &type, &file_size);
file->size = file_size;
if (!file->ptr)
die("Cannot read blob %s for path %s",
sha1_to_hex(o->blob_sha1),
o->path);
o->file = *file;
}
else
*file = o->file;
}
/*
* Origin is refcounted and usually we keep the blob contents to be
* reused.
*/
static inline struct origin *origin_incref(struct origin *o)
{
if (o)
o->refcnt++;
return o;
}
static void origin_decref(struct origin *o)
{
if (o && --o->refcnt <= 0) {
struct origin *p, *l = NULL;
if (o->previous)
origin_decref(o->previous);
free(o->file.ptr);
/* Should be present exactly once in commit chain */
for (p = o->commit->util; p; l = p, p = p->next) {
if (p == o) {
if (l)
l->next = p->next;
else
o->commit->util = p->next;
free(o);
return;
}
}
die("internal error in blame::origin_decref");
}
}
static void drop_origin_blob(struct origin *o)
{
if (o->file.ptr) {
free(o->file.ptr);
o->file.ptr = NULL;
}
}
/*
* Each group of lines is described by a blame_entry; it can be split
* as we pass blame to the parents. They are arranged in linked lists
* kept as `suspects' of some unprocessed origin, or entered (when the
* blame origin has been finalized) into the scoreboard structure.
* While the scoreboard structure is only sorted at the end of
* processing (according to final image line number), the lists
* attached to an origin are sorted by the target line number.
*/
struct blame_entry {
struct blame_entry *next;
/* the first line of this group in the final image;
* internally all line numbers are 0 based.
*/
int lno;
/* how many lines this group has */
int num_lines;
/* the commit that introduced this group into the final image */
struct origin *suspect;
/* the line number of the first line of this group in the
* suspect's file; internally all line numbers are 0 based.
*/
int s_lno;
/* how significant this entry is -- cached to avoid
* scanning the lines over and over.
*/
unsigned score;
};
/*
* Any merge of blames happens on lists of blames that arrived via
* different parents in a single suspect. In this case, we want to
* sort according to the suspect line numbers as opposed to the final
* image line numbers. The function body is somewhat longish because
* it avoids unnecessary writes.
*/
static struct blame_entry *blame_merge(struct blame_entry *list1,
struct blame_entry *list2)
{
struct blame_entry *p1 = list1, *p2 = list2,
**tail = &list1;
if (!p1)
return p2;
if (!p2)
return p1;
if (p1->s_lno <= p2->s_lno) {
do {
tail = &p1->next;
if ((p1 = *tail) == NULL) {
*tail = p2;
return list1;
}
} while (p1->s_lno <= p2->s_lno);
}
for (;;) {
*tail = p2;
do {
tail = &p2->next;
if ((p2 = *tail) == NULL) {
*tail = p1;
return list1;
}
} while (p1->s_lno > p2->s_lno);
*tail = p1;
do {
tail = &p1->next;
if ((p1 = *tail) == NULL) {
*tail = p2;
return list1;
}
} while (p1->s_lno <= p2->s_lno);
}
}
static void *get_next_blame(const void *p)
{
return ((struct blame_entry *)p)->next;
}
static void set_next_blame(void *p1, void *p2)
{
((struct blame_entry *)p1)->next = p2;
}
/*
* Final image line numbers are all different, so we don't need a
* three-way comparison here.
*/
static int compare_blame_final(const void *p1, const void *p2)
{
return ((struct blame_entry *)p1)->lno > ((struct blame_entry *)p2)->lno
? 1 : -1;
}
static int compare_blame_suspect(const void *p1, const void *p2)
{
const struct blame_entry *s1 = p1, *s2 = p2;
/*
* to allow for collating suspects, we sort according to the
* respective pointer value as the primary sorting criterion.
* The actual relation is pretty unimportant as long as it
* establishes a total order. Comparing as integers gives us
* that.
*/
if (s1->suspect != s2->suspect)
return (intptr_t)s1->suspect > (intptr_t)s2->suspect ? 1 : -1;
if (s1->s_lno == s2->s_lno)
return 0;
return s1->s_lno > s2->s_lno ? 1 : -1;
}
static struct blame_entry *blame_sort(struct blame_entry *head,
int (*compare_fn)(const void *, const void *))
{
return llist_mergesort (head, get_next_blame, set_next_blame, compare_fn);
}
static int compare_commits_by_reverse_commit_date(const void *a,
const void *b,
void *c)
{
return -compare_commits_by_commit_date(a, b, c);
}
/*
* The current state of the blame assignment.
*/
struct scoreboard {
/* the final commit (i.e. where we started digging from) */
struct commit *final;
/* Priority queue for commits with unassigned blame records */
struct prio_queue commits;
struct rev_info *revs;
const char *path;
/*
* The contents in the final image.
* Used by many functions to obtain contents of the nth line,
* indexed with scoreboard.lineno[blame_entry.lno].
*/
const char *final_buf;
unsigned long final_buf_size;
/* linked list of blames */
struct blame_entry *ent;
/* look-up a line in the final buffer */
int num_lines;
int *lineno;
};
static void sanity_check_refcnt(struct scoreboard *);
/*
* If two blame entries that are next to each other came from
* contiguous lines in the same origin (i.e. <commit, path> pair),
* merge them together.
*/
static void coalesce(struct scoreboard *sb)
{
struct blame_entry *ent, *next;
for (ent = sb->ent; ent && (next = ent->next); ent = next) {
if (ent->suspect == next->suspect &&
ent->s_lno + ent->num_lines == next->s_lno) {
ent->num_lines += next->num_lines;
ent->next = next->next;
origin_decref(next->suspect);
free(next);
ent->score = 0;
next = ent; /* again */
}
}
if (DEBUG) /* sanity */
sanity_check_refcnt(sb);
}
/*
* Merge the given sorted list of blames into a preexisting origin.
* If there were no previous blames to that commit, it is entered into
* the commit priority queue of the score board.
*/
static void queue_blames(struct scoreboard *sb, struct origin *porigin,
struct blame_entry *sorted)
{
if (porigin->suspects)
porigin->suspects = blame_merge(porigin->suspects, sorted);
else {
struct origin *o;
for (o = porigin->commit->util; o; o = o->next) {
if (o->suspects) {
porigin->suspects = sorted;
return;
}
}
porigin->suspects = sorted;
prio_queue_put(&sb->commits, porigin->commit);
}
}
/*
* Given a commit and a path in it, create a new origin structure.
* The callers that add blame to the scoreboard should use
* get_origin() to obtain shared, refcounted copy instead of calling
* this function directly.
*/
static struct origin *make_origin(struct commit *commit, const char *path)
{
struct origin *o;
FLEX_ALLOC_STR(o, path, path);
o->commit = commit;
o->refcnt = 1;
o->next = commit->util;
commit->util = o;
return o;
}
/*
* Locate an existing origin or create a new one.
* This moves the origin to front position in the commit util list.
*/
static struct origin *get_origin(struct scoreboard *sb,
struct commit *commit,
const char *path)
{
struct origin *o, *l;
for (o = commit->util, l = NULL; o; l = o, o = o->next) {
if (!strcmp(o->path, path)) {
/* bump to front */
if (l) {
l->next = o->next;
o->next = commit->util;
commit->util = o;
}
return origin_incref(o);
}
}
return make_origin(commit, path);
}
/*
* Fill the blob_sha1 field of an origin if it hasn't, so that later
* call to fill_origin_blob() can use it to locate the data. blob_sha1
* for an origin is also used to pass the blame for the entire file to
* the parent to detect the case where a child's blob is identical to
* that of its parent's.
*
* This also fills origin->mode for corresponding tree path.
*/
static int fill_blob_sha1_and_mode(struct origin *origin)
{
if (!is_null_sha1(origin->blob_sha1))
return 0;
if (get_tree_entry(origin->commit->object.oid.hash,
origin->path,
origin->blob_sha1, &origin->mode))
goto error_out;
if (sha1_object_info(origin->blob_sha1, NULL) != OBJ_BLOB)
goto error_out;
return 0;
error_out:
hashclr(origin->blob_sha1);
origin->mode = S_IFINVALID;
return -1;
}
/*
* We have an origin -- check if the same path exists in the
* parent and return an origin structure to represent it.
*/
static struct origin *find_origin(struct scoreboard *sb,
struct commit *parent,
struct origin *origin)
{
struct origin *porigin;
struct diff_options diff_opts;
const char *paths[2];
/* First check any existing origins */
for (porigin = parent->util; porigin; porigin = porigin->next)
if (!strcmp(porigin->path, origin->path)) {
/*
* The same path between origin and its parent
* without renaming -- the most common case.
*/
return origin_incref (porigin);
}
/* See if the origin->path is different between parent
* and origin first. Most of the time they are the
* same and diff-tree is fairly efficient about this.
*/
diff_setup(&diff_opts);
DIFF_OPT_SET(&diff_opts, RECURSIVE);
diff_opts.detect_rename = 0;
diff_opts.output_format = DIFF_FORMAT_NO_OUTPUT;
paths[0] = origin->path;
paths[1] = NULL;
parse_pathspec(&diff_opts.pathspec,
PATHSPEC_ALL_MAGIC & ~PATHSPEC_LITERAL,
PATHSPEC_LITERAL_PATH, "", paths);
diff_setup_done(&diff_opts);
if (is_null_oid(&origin->commit->object.oid))
do_diff_cache(parent->tree->object.oid.hash, &diff_opts);
else
diff_tree_sha1(parent->tree->object.oid.hash,
origin->commit->tree->object.oid.hash,
"", &diff_opts);
diffcore_std(&diff_opts);
if (!diff_queued_diff.nr) {
/* The path is the same as parent */
porigin = get_origin(sb, parent, origin->path);
hashcpy(porigin->blob_sha1, origin->blob_sha1);
porigin->mode = origin->mode;
} else {
/*
* Since origin->path is a pathspec, if the parent
* commit had it as a directory, we will see a whole
* bunch of deletion of files in the directory that we
* do not care about.
*/
int i;
struct diff_filepair *p = NULL;
for (i = 0; i < diff_queued_diff.nr; i++) {
const char *name;
p = diff_queued_diff.queue[i];
name = p->one->path ? p->one->path : p->two->path;
if (!strcmp(name, origin->path))
break;
}
if (!p)
die("internal error in blame::find_origin");
switch (p->status) {
default:
die("internal error in blame::find_origin (%c)",
p->status);
case 'M':
porigin = get_origin(sb, parent, origin->path);
hashcpy(porigin->blob_sha1, p->one->oid.hash);
porigin->mode = p->one->mode;
break;
case 'A':
case 'T':
/* Did not exist in parent, or type changed */
break;
}
}
diff_flush(&diff_opts);
clear_pathspec(&diff_opts.pathspec);
return porigin;
}
/*
* We have an origin -- find the path that corresponds to it in its
* parent and return an origin structure to represent it.
*/
static struct origin *find_rename(struct scoreboard *sb,
struct commit *parent,
struct origin *origin)
{
struct origin *porigin = NULL;
struct diff_options diff_opts;
int i;
diff_setup(&diff_opts);
DIFF_OPT_SET(&diff_opts, RECURSIVE);
diff_opts.detect_rename = DIFF_DETECT_RENAME;
diff_opts.output_format = DIFF_FORMAT_NO_OUTPUT;
diff_opts.single_follow = origin->path;
diff_setup_done(&diff_opts);
if (is_null_oid(&origin->commit->object.oid))
do_diff_cache(parent->tree->object.oid.hash, &diff_opts);
else
diff_tree_sha1(parent->tree->object.oid.hash,
origin->commit->tree->object.oid.hash,
"", &diff_opts);
diffcore_std(&diff_opts);
for (i = 0; i < diff_queued_diff.nr; i++) {
struct diff_filepair *p = diff_queued_diff.queue[i];
if ((p->status == 'R' || p->status == 'C') &&
!strcmp(p->two->path, origin->path)) {
porigin = get_origin(sb, parent, p->one->path);
hashcpy(porigin->blob_sha1, p->one->oid.hash);
porigin->mode = p->one->mode;
break;
}
}
diff_flush(&diff_opts);
clear_pathspec(&diff_opts.pathspec);
return porigin;
}
/*
* Append a new blame entry to a given output queue.
*/
static void add_blame_entry(struct blame_entry ***queue, struct blame_entry *e)
{
origin_incref(e->suspect);
e->next = **queue;
**queue = e;
*queue = &e->next;
}
/*
* src typically is on-stack; we want to copy the information in it to
* a malloced blame_entry that gets added to the given queue. The
* origin of dst loses a refcnt.
*/
static void dup_entry(struct blame_entry ***queue,
struct blame_entry *dst, struct blame_entry *src)
{
origin_incref(src->suspect);
origin_decref(dst->suspect);
memcpy(dst, src, sizeof(*src));
dst->next = **queue;
**queue = dst;
*queue = &dst->next;
}
static const char *nth_line(struct scoreboard *sb, long lno)
{
return sb->final_buf + sb->lineno[lno];
}
static const char *nth_line_cb(void *data, long lno)
{
return nth_line((struct scoreboard *)data, lno);
}
/*
* It is known that lines between tlno to same came from parent, and e
* has an overlap with that range. it also is known that parent's
* line plno corresponds to e's line tlno.
*
* <---- e ----->
* <------>
* <------------>
* <------------>
* <------------------>
*
* Split e into potentially three parts; before this chunk, the chunk
* to be blamed for the parent, and after that portion.
*/
static void split_overlap(struct blame_entry *split,
struct blame_entry *e,
int tlno, int plno, int same,
struct origin *parent)
{
int chunk_end_lno;
memset(split, 0, sizeof(struct blame_entry [3]));
if (e->s_lno < tlno) {
/* there is a pre-chunk part not blamed on parent */
split[0].suspect = origin_incref(e->suspect);
split[0].lno = e->lno;
split[0].s_lno = e->s_lno;
split[0].num_lines = tlno - e->s_lno;
split[1].lno = e->lno + tlno - e->s_lno;
split[1].s_lno = plno;
}
else {
split[1].lno = e->lno;
split[1].s_lno = plno + (e->s_lno - tlno);
}
if (same < e->s_lno + e->num_lines) {
/* there is a post-chunk part not blamed on parent */
split[2].suspect = origin_incref(e->suspect);
split[2].lno = e->lno + (same - e->s_lno);
split[2].s_lno = e->s_lno + (same - e->s_lno);
split[2].num_lines = e->s_lno + e->num_lines - same;
chunk_end_lno = split[2].lno;
}
else
chunk_end_lno = e->lno + e->num_lines;
split[1].num_lines = chunk_end_lno - split[1].lno;
/*
* if it turns out there is nothing to blame the parent for,
* forget about the splitting. !split[1].suspect signals this.
*/
if (split[1].num_lines < 1)
return;
split[1].suspect = origin_incref(parent);
}
/*
* split_overlap() divided an existing blame e into up to three parts
* in split. Any assigned blame is moved to queue to
* reflect the split.
*/
static void split_blame(struct blame_entry ***blamed,
struct blame_entry ***unblamed,
struct blame_entry *split,
struct blame_entry *e)
{
struct blame_entry *new_entry;
if (split[0].suspect && split[2].suspect) {
/* The first part (reuse storage for the existing entry e) */
dup_entry(unblamed, e, &split[0]);
/* The last part -- me */
new_entry = xmalloc(sizeof(*new_entry));
memcpy(new_entry, &(split[2]), sizeof(struct blame_entry));
add_blame_entry(unblamed, new_entry);
/* ... and the middle part -- parent */
new_entry = xmalloc(sizeof(*new_entry));
memcpy(new_entry, &(split[1]), sizeof(struct blame_entry));
add_blame_entry(blamed, new_entry);
}
else if (!split[0].suspect && !split[2].suspect)
/*
* The parent covers the entire area; reuse storage for
* e and replace it with the parent.
*/
dup_entry(blamed, e, &split[1]);
else if (split[0].suspect) {
/* me and then parent */
dup_entry(unblamed, e, &split[0]);
new_entry = xmalloc(sizeof(*new_entry));
memcpy(new_entry, &(split[1]), sizeof(struct blame_entry));
add_blame_entry(blamed, new_entry);
}
else {
/* parent and then me */
dup_entry(blamed, e, &split[1]);
new_entry = xmalloc(sizeof(*new_entry));
memcpy(new_entry, &(split[2]), sizeof(struct blame_entry));
add_blame_entry(unblamed, new_entry);
}
}
/*
* After splitting the blame, the origins used by the
* on-stack blame_entry should lose one refcnt each.
*/
static void decref_split(struct blame_entry *split)
{
int i;
for (i = 0; i < 3; i++)
origin_decref(split[i].suspect);
}
/*
* reverse_blame reverses the list given in head, appending tail.
* That allows us to build lists in reverse order, then reverse them
* afterwards. This can be faster than building the list in proper
* order right away. The reason is that building in proper order
* requires writing a link in the _previous_ element, while building
* in reverse order just requires placing the list head into the
* _current_ element.
*/
static struct blame_entry *reverse_blame(struct blame_entry *head,
struct blame_entry *tail)
{
while (head) {
struct blame_entry *next = head->next;
head->next = tail;
tail = head;
head = next;
}
return tail;
}
/*
* Process one hunk from the patch between the current suspect for
* blame_entry e and its parent. This first blames any unfinished
* entries before the chunk (which is where target and parent start
* differing) on the parent, and then splits blame entries at the
* start and at the end of the difference region. Since use of -M and
* -C options may lead to overlapping/duplicate source line number
* ranges, all we can rely on from sorting/merging is the order of the
* first suspect line number.
*/
static void blame_chunk(struct blame_entry ***dstq, struct blame_entry ***srcq,
int tlno, int offset, int same,
struct origin *parent)
{
struct blame_entry *e = **srcq;
struct blame_entry *samep = NULL, *diffp = NULL;
while (e && e->s_lno < tlno) {
struct blame_entry *next = e->next;
/*
* current record starts before differing portion. If
* it reaches into it, we need to split it up and
* examine the second part separately.
*/
if (e->s_lno + e->num_lines > tlno) {
/* Move second half to a new record */
int len = tlno - e->s_lno;
struct blame_entry *n = xcalloc(1, sizeof (struct blame_entry));
n->suspect = e->suspect;
n->lno = e->lno + len;
n->s_lno = e->s_lno + len;
n->num_lines = e->num_lines - len;
e->num_lines = len;
e->score = 0;
/* Push new record to diffp */
n->next = diffp;
diffp = n;
} else
origin_decref(e->suspect);
/* Pass blame for everything before the differing
* chunk to the parent */
e->suspect = origin_incref(parent);
e->s_lno += offset;
e->next = samep;
samep = e;
e = next;
}
/*
* As we don't know how much of a common stretch after this
* diff will occur, the currently blamed parts are all that we
* can assign to the parent for now.
*/
if (samep) {
**dstq = reverse_blame(samep, **dstq);
*dstq = &samep->next;
}
/*
* Prepend the split off portions: everything after e starts
* after the blameable portion.
*/
e = reverse_blame(diffp, e);
/*
* Now retain records on the target while parts are different
* from the parent.
*/
samep = NULL;
diffp = NULL;
while (e && e->s_lno < same) {
struct blame_entry *next = e->next;
/*
* If current record extends into sameness, need to split.
*/
if (e->s_lno + e->num_lines > same) {
/*
* Move second half to a new record to be
* processed by later chunks
*/
int len = same - e->s_lno;
struct blame_entry *n = xcalloc(1, sizeof (struct blame_entry));
n->suspect = origin_incref(e->suspect);
n->lno = e->lno + len;
n->s_lno = e->s_lno + len;
n->num_lines = e->num_lines - len;
e->num_lines = len;
e->score = 0;
/* Push new record to samep */
n->next = samep;
samep = n;
}
e->next = diffp;
diffp = e;
e = next;
}
**srcq = reverse_blame(diffp, reverse_blame(samep, e));
/* Move across elements that are in the unblamable portion */
if (diffp)
*srcq = &diffp->next;
}
struct blame_chunk_cb_data {
struct origin *parent;
long offset;
struct blame_entry **dstq;
struct blame_entry **srcq;
};
/* diff chunks are from parent to target */
static int blame_chunk_cb(long start_a, long count_a,
long start_b, long count_b, void *data)
{
struct blame_chunk_cb_data *d = data;
if (start_a - start_b != d->offset)
die("internal error in blame::blame_chunk_cb");
blame_chunk(&d->dstq, &d->srcq, start_b, start_a - start_b,
start_b + count_b, d->parent);
d->offset = start_a + count_a - (start_b + count_b);
return 0;
}
/*
* We are looking at the origin 'target' and aiming to pass blame
* for the lines it is suspected to its parent. Run diff to find
* which lines came from parent and pass blame for them.
*/
static void pass_blame_to_parent(struct scoreboard *sb,
struct origin *target,
struct origin *parent)
{
mmfile_t file_p, file_o;
struct blame_chunk_cb_data d;
struct blame_entry *newdest = NULL;
if (!target->suspects)
return; /* nothing remains for this target */
d.parent = parent;
d.offset = 0;
d.dstq = &newdest; d.srcq = &target->suspects;
fill_origin_blob(&sb->revs->diffopt, parent, &file_p);
fill_origin_blob(&sb->revs->diffopt, target, &file_o);
num_get_patch++;
if (diff_hunks(&file_p, &file_o, blame_chunk_cb, &d))
die("unable to generate diff (%s -> %s)",
oid_to_hex(&parent->commit->object.oid),
oid_to_hex(&target->commit->object.oid));
/* The rest are the same as the parent */
blame_chunk(&d.dstq, &d.srcq, INT_MAX, d.offset, INT_MAX, parent);
*d.dstq = NULL;
queue_blames(sb, parent, newdest);
return;
}
/*
* The lines in blame_entry after splitting blames many times can become
* very small and trivial, and at some point it becomes pointless to
* blame the parents. E.g. "\t\t}\n\t}\n\n" appears everywhere in any
* ordinary C program, and it is not worth to say it was copied from
* totally unrelated file in the parent.
*
* Compute how trivial the lines in the blame_entry are.
*/
static unsigned ent_score(struct scoreboard *sb, struct blame_entry *e)
{
unsigned score;
const char *cp, *ep;
if (e->score)
return e->score;
score = 1;
cp = nth_line(sb, e->lno);
ep = nth_line(sb, e->lno + e->num_lines);
while (cp < ep) {
unsigned ch = *((unsigned char *)cp);
if (isalnum(ch))
score++;
cp++;
}
e->score = score;
return score;
}
/*
* best_so_far[] and this[] are both a split of an existing blame_entry
* that passes blame to the parent. Maintain best_so_far the best split
* so far, by comparing this and best_so_far and copying this into
* bst_so_far as needed.
*/
static void copy_split_if_better(struct scoreboard *sb,
struct blame_entry *best_so_far,
struct blame_entry *this)
{
int i;
if (!this[1].suspect)
return;
if (best_so_far[1].suspect) {
if (ent_score(sb, &this[1]) < ent_score(sb, &best_so_far[1]))
return;
}
for (i = 0; i < 3; i++)
origin_incref(this[i].suspect);
decref_split(best_so_far);
memcpy(best_so_far, this, sizeof(struct blame_entry [3]));
}
/*
* We are looking at a part of the final image represented by
* ent (tlno and same are offset by ent->s_lno).
* tlno is where we are looking at in the final image.
* up to (but not including) same match preimage.
* plno is where we are looking at in the preimage.
*
* <-------------- final image ---------------------->
* <------ent------>
* ^tlno ^same
* <---------preimage----->
* ^plno
*
* All line numbers are 0-based.
*/
static void handle_split(struct scoreboard *sb,
struct blame_entry *ent,
int tlno, int plno, int same,
struct origin *parent,
struct blame_entry *split)
{
if (ent->num_lines <= tlno)
return;
if (tlno < same) {
struct blame_entry this[3];
tlno += ent->s_lno;
same += ent->s_lno;
split_overlap(this, ent, tlno, plno, same, parent);
copy_split_if_better(sb, split, this);
decref_split(this);
}
}
struct handle_split_cb_data {
struct scoreboard *sb;
struct blame_entry *ent;
struct origin *parent;
struct blame_entry *split;
long plno;
long tlno;
};
static int handle_split_cb(long start_a, long count_a,
long start_b, long count_b, void *data)
{
struct handle_split_cb_data *d = data;
handle_split(d->sb, d->ent, d->tlno, d->plno, start_b, d->parent,
d->split);
d->plno = start_a + count_a;
d->tlno = start_b + count_b;
return 0;
}
/*
* Find the lines from parent that are the same as ent so that
* we can pass blames to it. file_p has the blob contents for
* the parent.
*/
static void find_copy_in_blob(struct scoreboard *sb,
struct blame_entry *ent,
struct origin *parent,
struct blame_entry *split,
mmfile_t *file_p)
{
const char *cp;
mmfile_t file_o;
struct handle_split_cb_data d;
memset(&d, 0, sizeof(d));
d.sb = sb; d.ent = ent; d.parent = parent; d.split = split;
/*
* Prepare mmfile that contains only the lines in ent.
*/
cp = nth_line(sb, ent->lno);
file_o.ptr = (char *) cp;
file_o.size = nth_line(sb, ent->lno + ent->num_lines) - cp;
/*
* file_o is a part of final image we are annotating.
* file_p partially may match that image.
*/
memset(split, 0, sizeof(struct blame_entry [3]));
if (diff_hunks(file_p, &file_o, handle_split_cb, &d))
die("unable to generate diff (%s)",
oid_to_hex(&parent->commit->object.oid));
/* remainder, if any, all match the preimage */
handle_split(sb, ent, d.tlno, d.plno, ent->num_lines, parent, split);
}
/* Move all blame entries from list *source that have a score smaller
* than score_min to the front of list *small.
* Returns a pointer to the link pointing to the old head of the small list.
*/
static struct blame_entry **filter_small(struct scoreboard *sb,
struct blame_entry **small,
struct blame_entry **source,
unsigned score_min)
{
struct blame_entry *p = *source;
struct blame_entry *oldsmall = *small;
while (p) {
if (ent_score(sb, p) <= score_min) {
*small = p;
small = &p->next;
p = *small;
} else {
*source = p;
source = &p->next;
p = *source;
}
}
*small = oldsmall;
*source = NULL;
return small;
}
/*
* See if lines currently target is suspected for can be attributed to
* parent.
*/
static void find_move_in_parent(struct scoreboard *sb,
struct blame_entry ***blamed,
struct blame_entry **toosmall,
struct origin *target,
struct origin *parent)
{
struct blame_entry *e, split[3];
struct blame_entry *unblamed = target->suspects;
struct blame_entry *leftover = NULL;
mmfile_t file_p;
if (!unblamed)
return; /* nothing remains for this target */
fill_origin_blob(&sb->revs->diffopt, parent, &file_p);
if (!file_p.ptr)
return;
/* At each iteration, unblamed has a NULL-terminated list of
* entries that have not yet been tested for blame. leftover
* contains the reversed list of entries that have been tested
* without being assignable to the parent.
*/
do {
struct blame_entry **unblamedtail = &unblamed;
struct blame_entry *next;
for (e = unblamed; e; e = next) {
next = e->next;
find_copy_in_blob(sb, e, parent, split, &file_p);
if (split[1].suspect &&
blame_move_score < ent_score(sb, &split[1])) {
split_blame(blamed, &unblamedtail, split, e);
} else {
e->next = leftover;
leftover = e;
}
decref_split(split);
}
*unblamedtail = NULL;
toosmall = filter_small(sb, toosmall, &unblamed, blame_move_score);
} while (unblamed);
target->suspects = reverse_blame(leftover, NULL);
}
struct blame_list {
struct blame_entry *ent;
struct blame_entry split[3];
};
/*
* Count the number of entries the target is suspected for,
* and prepare a list of entry and the best split.
*/
static struct blame_list *setup_blame_list(struct blame_entry *unblamed,
int *num_ents_p)
{
struct blame_entry *e;
int num_ents, i;
struct blame_list *blame_list = NULL;
for (e = unblamed, num_ents = 0; e; e = e->next)
num_ents++;
if (num_ents) {
blame_list = xcalloc(num_ents, sizeof(struct blame_list));
for (e = unblamed, i = 0; e; e = e->next)
blame_list[i++].ent = e;
}
*num_ents_p = num_ents;
return blame_list;
}
/*
* For lines target is suspected for, see if we can find code movement
* across file boundary from the parent commit. porigin is the path
* in the parent we already tried.
*/
static void find_copy_in_parent(struct scoreboard *sb,
struct blame_entry ***blamed,
struct blame_entry **toosmall,
struct origin *target,
struct commit *parent,
struct origin *porigin,
int opt)
{
struct diff_options diff_opts;
int i, j;
struct blame_list *blame_list;
int num_ents;
struct blame_entry *unblamed = target->suspects;
struct blame_entry *leftover = NULL;
if (!unblamed)
return; /* nothing remains for this target */
diff_setup(&diff_opts);
DIFF_OPT_SET(&diff_opts, RECURSIVE);
diff_opts.output_format = DIFF_FORMAT_NO_OUTPUT;
diff_setup_done(&diff_opts);
/* Try "find copies harder" on new path if requested;
* we do not want to use diffcore_rename() actually to
* match things up; find_copies_harder is set only to
* force diff_tree_sha1() to feed all filepairs to diff_queue,
* and this code needs to be after diff_setup_done(), which
* usually makes find-copies-harder imply copy detection.
*/
if ((opt & PICKAXE_BLAME_COPY_HARDEST)
|| ((opt & PICKAXE_BLAME_COPY_HARDER)
&& (!porigin || strcmp(target->path, porigin->path))))
DIFF_OPT_SET(&diff_opts, FIND_COPIES_HARDER);
if (is_null_oid(&target->commit->object.oid))
do_diff_cache(parent->tree->object.oid.hash, &diff_opts);
else
diff_tree_sha1(parent->tree->object.oid.hash,
target->commit->tree->object.oid.hash,
"", &diff_opts);
if (!DIFF_OPT_TST(&diff_opts, FIND_COPIES_HARDER))
diffcore_std(&diff_opts);
do {
struct blame_entry **unblamedtail = &unblamed;
blame_list = setup_blame_list(unblamed, &num_ents);
for (i = 0; i < diff_queued_diff.nr; i++) {
struct diff_filepair *p = diff_queued_diff.queue[i];
struct origin *norigin;
mmfile_t file_p;
struct blame_entry this[3];
if (!DIFF_FILE_VALID(p->one))
continue; /* does not exist in parent */
if (S_ISGITLINK(p->one->mode))
continue; /* ignore git links */
if (porigin && !strcmp(p->one->path, porigin->path))
/* find_move already dealt with this path */
continue;
norigin = get_origin(sb, parent, p->one->path);
hashcpy(norigin->blob_sha1, p->one->oid.hash);
norigin->mode = p->one->mode;
fill_origin_blob(&sb->revs->diffopt, norigin, &file_p);
if (!file_p.ptr)
continue;
for (j = 0; j < num_ents; j++) {
find_copy_in_blob(sb, blame_list[j].ent,
norigin, this, &file_p);
copy_split_if_better(sb, blame_list[j].split,
this);
decref_split(this);
}
origin_decref(norigin);
}
for (j = 0; j < num_ents; j++) {
struct blame_entry *split = blame_list[j].split;
if (split[1].suspect &&
blame_copy_score < ent_score(sb, &split[1])) {
split_blame(blamed, &unblamedtail, split,
blame_list[j].ent);
} else {
blame_list[j].ent->next = leftover;
leftover = blame_list[j].ent;
}
decref_split(split);
}
free(blame_list);
*unblamedtail = NULL;
toosmall = filter_small(sb, toosmall, &unblamed, blame_copy_score);
} while (unblamed);
target->suspects = reverse_blame(leftover, NULL);
diff_flush(&diff_opts);
clear_pathspec(&diff_opts.pathspec);
}
/*
* The blobs of origin and porigin exactly match, so everything
* origin is suspected for can be blamed on the parent.
*/
static void pass_whole_blame(struct scoreboard *sb,
struct origin *origin, struct origin *porigin)
{
struct blame_entry *e, *suspects;
if (!porigin->file.ptr && origin->file.ptr) {
/* Steal its file */
porigin->file = origin->file;
origin->file.ptr = NULL;
}
suspects = origin->suspects;
origin->suspects = NULL;
for (e = suspects; e; e = e->next) {
origin_incref(porigin);
origin_decref(e->suspect);
e->suspect = porigin;
}
queue_blames(sb, porigin, suspects);
}
/*
* We pass blame from the current commit to its parents. We keep saying
* "parent" (and "porigin"), but what we mean is to find scapegoat to
* exonerate ourselves.
*/
static struct commit_list *first_scapegoat(struct rev_info *revs, struct commit *commit)
{
if (!reverse) {
if (revs->first_parent_only &&
commit->parents &&
commit->parents->next) {
free_commit_list(commit->parents->next);
commit->parents->next = NULL;
}
return commit->parents;
}
return lookup_decoration(&revs->children, &commit->object);
}
static int num_scapegoats(struct rev_info *revs, struct commit *commit)
{
struct commit_list *l = first_scapegoat(revs, commit);
return commit_list_count(l);
}
/* Distribute collected unsorted blames to the respected sorted lists
* in the various origins.
*/
static void distribute_blame(struct scoreboard *sb, struct blame_entry *blamed)
{
blamed = blame_sort(blamed, compare_blame_suspect);
while (blamed)
{
struct origin *porigin = blamed->suspect;
struct blame_entry *suspects = NULL;
do {
struct blame_entry *next = blamed->next;
blamed->next = suspects;
suspects = blamed;
blamed = next;
} while (blamed && blamed->suspect == porigin);
suspects = reverse_blame(suspects, NULL);
queue_blames(sb, porigin, suspects);
}
}
#define MAXSG 16
static void pass_blame(struct scoreboard *sb, struct origin *origin, int opt)
{
struct rev_info *revs = sb->revs;
int i, pass, num_sg;
struct commit *commit = origin->commit;
struct commit_list *sg;
struct origin *sg_buf[MAXSG];
struct origin *porigin, **sg_origin = sg_buf;
struct blame_entry *toosmall = NULL;
struct blame_entry *blames, **blametail = &blames;
num_sg = num_scapegoats(revs, commit);
if (!num_sg)
goto finish;
else if (num_sg < ARRAY_SIZE(sg_buf))
memset(sg_buf, 0, sizeof(sg_buf));
else
sg_origin = xcalloc(num_sg, sizeof(*sg_origin));
/*
* The first pass looks for unrenamed path to optimize for
* common cases, then we look for renames in the second pass.
*/
for (pass = 0; pass < 2 - no_whole_file_rename; pass++) {
struct origin *(*find)(struct scoreboard *,
struct commit *, struct origin *);
find = pass ? find_rename : find_origin;
for (i = 0, sg = first_scapegoat(revs, commit);
i < num_sg && sg;
sg = sg->next, i++) {
struct commit *p = sg->item;
int j, same;
if (sg_origin[i])
continue;
if (parse_commit(p))
continue;
porigin = find(sb, p, origin);
if (!porigin)
continue;
if (!hashcmp(porigin->blob_sha1, origin->blob_sha1)) {
pass_whole_blame(sb, origin, porigin);
origin_decref(porigin);
goto finish;
}
for (j = same = 0; j < i; j++)
if (sg_origin[j] &&
!hashcmp(sg_origin[j]->blob_sha1,
porigin->blob_sha1)) {
same = 1;
break;
}
if (!same)
sg_origin[i] = porigin;
else
origin_decref(porigin);
}
}
num_commits++;
for (i = 0, sg = first_scapegoat(revs, commit);
i < num_sg && sg;
sg = sg->next, i++) {
struct origin *porigin = sg_origin[i];
if (!porigin)
continue;
if (!origin->previous) {
origin_incref(porigin);
origin->previous = porigin;
}
pass_blame_to_parent(sb, origin, porigin);
if (!origin->suspects)
goto finish;
}
/*
* Optionally find moves in parents' files.
*/
if (opt & PICKAXE_BLAME_MOVE) {
filter_small(sb, &toosmall, &origin->suspects, blame_move_score);
if (origin->suspects) {
for (i = 0, sg = first_scapegoat(revs, commit);
i < num_sg && sg;
sg = sg->next, i++) {
struct origin *porigin = sg_origin[i];
if (!porigin)
continue;
find_move_in_parent(sb, &blametail, &toosmall, origin, porigin);
if (!origin->suspects)
break;
}
}
}
/*
* Optionally find copies from parents' files.
*/
if (opt & PICKAXE_BLAME_COPY) {
if (blame_copy_score > blame_move_score)
filter_small(sb, &toosmall, &origin->suspects, blame_copy_score);
else if (blame_copy_score < blame_move_score) {
origin->suspects = blame_merge(origin->suspects, toosmall);
toosmall = NULL;
filter_small(sb, &toosmall, &origin->suspects, blame_copy_score);
}
if (!origin->suspects)
goto finish;
for (i = 0, sg = first_scapegoat(revs, commit);
i < num_sg && sg;
sg = sg->next, i++) {
struct origin *porigin = sg_origin[i];
find_copy_in_parent(sb, &blametail, &toosmall,
origin, sg->item, porigin, opt);
if (!origin->suspects)
goto finish;
}
}
finish:
*blametail = NULL;
distribute_blame(sb, blames);
/*
* prepend toosmall to origin->suspects
*
* There is no point in sorting: this ends up on a big
* unsorted list in the caller anyway.
*/
if (toosmall) {
struct blame_entry **tail = &toosmall;
while (*tail)
tail = &(*tail)->next;
*tail = origin->suspects;
origin->suspects = toosmall;
}
for (i = 0; i < num_sg; i++) {
if (sg_origin[i]) {
drop_origin_blob(sg_origin[i]);
origin_decref(sg_origin[i]);
}
}
drop_origin_blob(origin);
if (sg_buf != sg_origin)
free(sg_origin);
}
/*
* Information on commits, used for output.
*/
struct commit_info {
struct strbuf author;
struct strbuf author_mail;
unsigned long author_time;
struct strbuf author_tz;
/* filled only when asked for details */
struct strbuf committer;
struct strbuf committer_mail;
unsigned long committer_time;
struct strbuf committer_tz;
struct strbuf summary;
};
/*
* Parse author/committer line in the commit object buffer
*/
static void get_ac_line(const char *inbuf, const char *what,
struct strbuf *name, struct strbuf *mail,
unsigned long *time, struct strbuf *tz)
{
struct ident_split ident;
size_t len, maillen, namelen;
char *tmp, *endp;
const char *namebuf, *mailbuf;
tmp = strstr(inbuf, what);
if (!tmp)
goto error_out;
tmp += strlen(what);
endp = strchr(tmp, '\n');
if (!endp)
len = strlen(tmp);
else
len = endp - tmp;
if (split_ident_line(&ident, tmp, len)) {
error_out:
/* Ugh */
tmp = "(unknown)";
strbuf_addstr(name, tmp);
strbuf_addstr(mail, tmp);
strbuf_addstr(tz, tmp);
*time = 0;
return;
}
namelen = ident.name_end - ident.name_begin;
namebuf = ident.name_begin;
maillen = ident.mail_end - ident.mail_begin;
mailbuf = ident.mail_begin;
if (ident.date_begin && ident.date_end)
*time = strtoul(ident.date_begin, NULL, 10);
else
*time = 0;
if (ident.tz_begin && ident.tz_end)
strbuf_add(tz, ident.tz_begin, ident.tz_end - ident.tz_begin);
else
strbuf_addstr(tz, "(unknown)");
/*
* Now, convert both name and e-mail using mailmap
*/
map_user(&mailmap, &mailbuf, &maillen,
&namebuf, &namelen);
strbuf_addf(mail, "<%.*s>", (int)maillen, mailbuf);
strbuf_add(name, namebuf, namelen);
}
static void commit_info_init(struct commit_info *ci)
{
strbuf_init(&ci->author, 0);
strbuf_init(&ci->author_mail, 0);
strbuf_init(&ci->author_tz, 0);
strbuf_init(&ci->committer, 0);
strbuf_init(&ci->committer_mail, 0);
strbuf_init(&ci->committer_tz, 0);
strbuf_init(&ci->summary, 0);
}
static void commit_info_destroy(struct commit_info *ci)
{
strbuf_release(&ci->author);
strbuf_release(&ci->author_mail);
strbuf_release(&ci->author_tz);
strbuf_release(&ci->committer);
strbuf_release(&ci->committer_mail);
strbuf_release(&ci->committer_tz);
strbuf_release(&ci->summary);
}
static void get_commit_info(struct commit *commit,
struct commit_info *ret,
int detailed)
{
int len;
const char *subject, *encoding;
const char *message;
commit_info_init(ret);
encoding = get_log_output_encoding();
message = logmsg_reencode(commit, NULL, encoding);
get_ac_line(message, "\nauthor ",
&ret->author, &ret->author_mail,
&ret->author_time, &ret->author_tz);
if (!detailed) {
unuse_commit_buffer(commit, message);
return;
}
get_ac_line(message, "\ncommitter ",
&ret->committer, &ret->committer_mail,
&ret->committer_time, &ret->committer_tz);
len = find_commit_subject(message, &subject);
if (len)
strbuf_add(&ret->summary, subject, len);
else
strbuf_addf(&ret->summary, "(%s)", oid_to_hex(&commit->object.oid));
unuse_commit_buffer(commit, message);
}
/*
* To allow LF and other nonportable characters in pathnames,
* they are c-style quoted as needed.
*/
static void write_filename_info(const char *path)
{
printf("filename ");
write_name_quoted(path, stdout, '\n');
}
/*
* Porcelain/Incremental format wants to show a lot of details per
* commit. Instead of repeating this every line, emit it only once,
* the first time each commit appears in the output (unless the
* user has specifically asked for us to repeat).
*/
static int emit_one_suspect_detail(struct origin *suspect, int repeat)
{
struct commit_info ci;
if (!repeat && (suspect->commit->object.flags & METAINFO_SHOWN))
return 0;
suspect->commit->object.flags |= METAINFO_SHOWN;
get_commit_info(suspect->commit, &ci, 1);
printf("author %s\n", ci.author.buf);
printf("author-mail %s\n", ci.author_mail.buf);
printf("author-time %lu\n", ci.author_time);
printf("author-tz %s\n", ci.author_tz.buf);
printf("committer %s\n", ci.committer.buf);
printf("committer-mail %s\n", ci.committer_mail.buf);
printf("committer-time %lu\n", ci.committer_time);
printf("committer-tz %s\n", ci.committer_tz.buf);
printf("summary %s\n", ci.summary.buf);
if (suspect->commit->object.flags & UNINTERESTING)
printf("boundary\n");
if (suspect->previous) {
struct origin *prev = suspect->previous;
printf("previous %s ", oid_to_hex(&prev->commit->object.oid));
write_name_quoted(prev->path, stdout, '\n');
}
commit_info_destroy(&ci);
return 1;
}
/*
* The blame_entry is found to be guilty for the range.
* Show it in incremental output.
*/
static void found_guilty_entry(struct blame_entry *ent,
struct progress_info *pi)
{
if (incremental) {
struct origin *suspect = ent->suspect;
printf("%s %d %d %d\n",
oid_to_hex(&suspect->commit->object.oid),
ent->s_lno + 1, ent->lno + 1, ent->num_lines);
emit_one_suspect_detail(suspect, 0);
write_filename_info(suspect->path);
maybe_flush_or_die(stdout, "stdout");
}
pi->blamed_lines += ent->num_lines;
display_progress(pi->progress, pi->blamed_lines);
}
/*
* The main loop -- while we have blobs with lines whose true origin
* is still unknown, pick one blob, and allow its lines to pass blames
* to its parents. */
static void assign_blame(struct scoreboard *sb, int opt)
{
struct rev_info *revs = sb->revs;
struct commit *commit = prio_queue_get(&sb->commits);
struct progress_info pi = { NULL, 0 };
if (show_progress)
pi.progress = start_progress_delay(_("Blaming lines"),
sb->num_lines, 50, 1);
while (commit) {
struct blame_entry *ent;
struct origin *suspect = commit->util;
/* find one suspect to break down */
while (suspect && !suspect->suspects)
suspect = suspect->next;
if (!suspect) {
commit = prio_queue_get(&sb->commits);
continue;
}
assert(commit == suspect->commit);
/*
* We will use this suspect later in the loop,
* so hold onto it in the meantime.
*/
origin_incref(suspect);
parse_commit(commit);
if (reverse ||
(!(commit->object.flags & UNINTERESTING) &&
!(revs->max_age != -1 && commit->date < revs->max_age)))
pass_blame(sb, suspect, opt);
else {
commit->object.flags |= UNINTERESTING;
if (commit->object.parsed)
mark_parents_uninteresting(commit);
}
/* treat root commit as boundary */
if (!commit->parents && !show_root)
commit->object.flags |= UNINTERESTING;
/* Take responsibility for the remaining entries */
ent = suspect->suspects;
if (ent) {
suspect->guilty = 1;
for (;;) {
struct blame_entry *next = ent->next;
found_guilty_entry(ent, &pi);
if (next) {
ent = next;
continue;
}
ent->next = sb->ent;
sb->ent = suspect->suspects;
suspect->suspects = NULL;
break;
}
}
origin_decref(suspect);
if (DEBUG) /* sanity */
sanity_check_refcnt(sb);
}
stop_progress(&pi.progress);
}
static const char *format_time(unsigned long time, const char *tz_str,
int show_raw_time)
{
static struct strbuf time_buf = STRBUF_INIT;
strbuf_reset(&time_buf);
if (show_raw_time) {
strbuf_addf(&time_buf, "%lu %s", time, tz_str);
}
else {
const char *time_str;
size_t time_width;
int tz;
tz = atoi(tz_str);
time_str = show_date(time, tz, &blame_date_mode);
strbuf_addstr(&time_buf, time_str);
/*
* Add space paddings to time_buf to display a fixed width
* string, and use time_width for display width calibration.
*/
for (time_width = utf8_strwidth(time_str);
time_width < blame_date_width;
time_width++)
strbuf_addch(&time_buf, ' ');
}
return time_buf.buf;
}
#define OUTPUT_ANNOTATE_COMPAT 001
#define OUTPUT_LONG_OBJECT_NAME 002
#define OUTPUT_RAW_TIMESTAMP 004
#define OUTPUT_PORCELAIN 010
#define OUTPUT_SHOW_NAME 020
#define OUTPUT_SHOW_NUMBER 040
#define OUTPUT_SHOW_SCORE 0100
#define OUTPUT_NO_AUTHOR 0200
#define OUTPUT_SHOW_EMAIL 0400
#define OUTPUT_LINE_PORCELAIN 01000
static void emit_porcelain_details(struct origin *suspect, int repeat)
{
if (emit_one_suspect_detail(suspect, repeat) ||
(suspect->commit->object.flags & MORE_THAN_ONE_PATH))
write_filename_info(suspect->path);
}
static void emit_porcelain(struct scoreboard *sb, struct blame_entry *ent,
int opt)
{
int repeat = opt & OUTPUT_LINE_PORCELAIN;
int cnt;
const char *cp;
struct origin *suspect = ent->suspect;
char hex[GIT_SHA1_HEXSZ + 1];
sha1_to_hex_r(hex, suspect->commit->object.oid.hash);
printf("%s %d %d %d\n",
hex,
ent->s_lno + 1,
ent->lno + 1,
ent->num_lines);
emit_porcelain_details(suspect, repeat);
cp = nth_line(sb, ent->lno);
for (cnt = 0; cnt < ent->num_lines; cnt++) {
char ch;
if (cnt) {
printf("%s %d %d\n", hex,
ent->s_lno + 1 + cnt,
ent->lno + 1 + cnt);
if (repeat)
emit_porcelain_details(suspect, 1);
}
putchar('\t');
do {
ch = *cp++;
putchar(ch);
} while (ch != '\n' &&
cp < sb->final_buf + sb->final_buf_size);
}
if (sb->final_buf_size && cp[-1] != '\n')
putchar('\n');
}
static void emit_other(struct scoreboard *sb, struct blame_entry *ent, int opt)
{
int cnt;
const char *cp;
struct origin *suspect = ent->suspect;
struct commit_info ci;
char hex[GIT_SHA1_HEXSZ + 1];
int show_raw_time = !!(opt & OUTPUT_RAW_TIMESTAMP);
get_commit_info(suspect->commit, &ci, 1);
sha1_to_hex_r(hex, suspect->commit->object.oid.hash);
cp = nth_line(sb, ent->lno);
for (cnt = 0; cnt < ent->num_lines; cnt++) {
char ch;
int length = (opt & OUTPUT_LONG_OBJECT_NAME) ? 40 : abbrev;
if (suspect->commit->object.flags & UNINTERESTING) {
if (blank_boundary)
memset(hex, ' ', length);
else if (!(opt & OUTPUT_ANNOTATE_COMPAT)) {
length--;
putchar('^');
}
}
printf("%.*s", length, hex);
if (opt & OUTPUT_ANNOTATE_COMPAT) {
const char *name;
if (opt & OUTPUT_SHOW_EMAIL)
name = ci.author_mail.buf;
else
name = ci.author.buf;
printf("\t(%10s\t%10s\t%d)", name,
format_time(ci.author_time, ci.author_tz.buf,
show_raw_time),
ent->lno + 1 + cnt);
} else {
if (opt & OUTPUT_SHOW_SCORE)
printf(" %*d %02d",
max_score_digits, ent->score,
ent->suspect->refcnt);
if (opt & OUTPUT_SHOW_NAME)
printf(" %-*.*s", longest_file, longest_file,
suspect->path);
if (opt & OUTPUT_SHOW_NUMBER)
printf(" %*d", max_orig_digits,
ent->s_lno + 1 + cnt);
if (!(opt & OUTPUT_NO_AUTHOR)) {
const char *name;
int pad;
if (opt & OUTPUT_SHOW_EMAIL)
name = ci.author_mail.buf;
else
name = ci.author.buf;
pad = longest_author - utf8_strwidth(name);
printf(" (%s%*s %10s",
name, pad, "",
format_time(ci.author_time,
ci.author_tz.buf,
show_raw_time));
}
printf(" %*d) ",
max_digits, ent->lno + 1 + cnt);
}
do {
ch = *cp++;
putchar(ch);
} while (ch != '\n' &&
cp < sb->final_buf + sb->final_buf_size);
}
if (sb->final_buf_size && cp[-1] != '\n')
putchar('\n');
commit_info_destroy(&ci);
}
static void output(struct scoreboard *sb, int option)
{
struct blame_entry *ent;
if (option & OUTPUT_PORCELAIN) {
for (ent = sb->ent; ent; ent = ent->next) {
int count = 0;
struct origin *suspect;
struct commit *commit = ent->suspect->commit;
if (commit->object.flags & MORE_THAN_ONE_PATH)
continue;
for (suspect = commit->util; suspect; suspect = suspect->next) {
if (suspect->guilty && count++) {
commit->object.flags |= MORE_THAN_ONE_PATH;
break;
}
}
}
}
for (ent = sb->ent; ent; ent = ent->next) {
if (option & OUTPUT_PORCELAIN)
emit_porcelain(sb, ent, option);
else {
emit_other(sb, ent, option);
}
}
}
static const char *get_next_line(const char *start, const char *end)
{
const char *nl = memchr(start, '\n', end - start);
return nl ? nl + 1 : end;
}
/*
* To allow quick access to the contents of nth line in the
* final image, prepare an index in the scoreboard.
*/
static int prepare_lines(struct scoreboard *sb)
{
const char *buf = sb->final_buf;
unsigned long len = sb->final_buf_size;
const char *end = buf + len;
const char *p;
int *lineno;
int num = 0;
for (p = buf; p < end; p = get_next_line(p, end))
num++;
ALLOC_ARRAY(sb->lineno, num + 1);
lineno = sb->lineno;
for (p = buf; p < end; p = get_next_line(p, end))
*lineno++ = p - buf;
*lineno = len;
sb->num_lines = num;
return sb->num_lines;
}
/*
* Add phony grafts for use with -S; this is primarily to
* support git's cvsserver that wants to give a linear history
* to its clients.
*/
static int read_ancestry(const char *graft_file)
{
FILE *fp = fopen(graft_file, "r");
struct strbuf buf = STRBUF_INIT;
if (!fp)
return -1;
while (!strbuf_getwholeline(&buf, fp, '\n')) {
/* The format is just "Commit Parent1 Parent2 ...\n" */
struct commit_graft *graft = read_graft_line(buf.buf, buf.len);
if (graft)
register_commit_graft(graft, 0);
}
fclose(fp);
strbuf_release(&buf);
return 0;
}
static int update_auto_abbrev(int auto_abbrev, struct origin *suspect)
{
const char *uniq = find_unique_abbrev(suspect->commit->object.oid.hash,
auto_abbrev);
int len = strlen(uniq);
if (auto_abbrev < len)
return len;
return auto_abbrev;
}
/*
* How many columns do we need to show line numbers, authors,
* and filenames?
*/
static void find_alignment(struct scoreboard *sb, int *option)
{
int longest_src_lines = 0;
int longest_dst_lines = 0;
unsigned largest_score = 0;
struct blame_entry *e;
int compute_auto_abbrev = (abbrev < 0);
int auto_abbrev = default_abbrev;
for (e = sb->ent; e; e = e->next) {
struct origin *suspect = e->suspect;
int num;
if (compute_auto_abbrev)
auto_abbrev = update_auto_abbrev(auto_abbrev, suspect);
if (strcmp(suspect->path, sb->path))
*option |= OUTPUT_SHOW_NAME;
num = strlen(suspect->path);
if (longest_file < num)
longest_file = num;
if (!(suspect->commit->object.flags & METAINFO_SHOWN)) {
struct commit_info ci;
suspect->commit->object.flags |= METAINFO_SHOWN;
get_commit_info(suspect->commit, &ci, 1);
if (*option & OUTPUT_SHOW_EMAIL)
num = utf8_strwidth(ci.author_mail.buf);
else
num = utf8_strwidth(ci.author.buf);
if (longest_author < num)
longest_author = num;
commit_info_destroy(&ci);
}
num = e->s_lno + e->num_lines;
if (longest_src_lines < num)
longest_src_lines = num;
num = e->lno + e->num_lines;
if (longest_dst_lines < num)
longest_dst_lines = num;
if (largest_score < ent_score(sb, e))
largest_score = ent_score(sb, e);
}
max_orig_digits = decimal_width(longest_src_lines);
max_digits = decimal_width(longest_dst_lines);
max_score_digits = decimal_width(largest_score);
if (compute_auto_abbrev)
/* one more abbrev length is needed for the boundary commit */
abbrev = auto_abbrev + 1;
}
/*
* For debugging -- origin is refcounted, and this asserts that
* we do not underflow.
*/
static void sanity_check_refcnt(struct scoreboard *sb)
{
int baa = 0;
struct blame_entry *ent;
for (ent = sb->ent; ent; ent = ent->next) {
/* Nobody should have zero or negative refcnt */
if (ent->suspect->refcnt <= 0) {
fprintf(stderr, "%s in %s has negative refcnt %d\n",
ent->suspect->path,
oid_to_hex(&ent->suspect->commit->object.oid),
ent->suspect->refcnt);
baa = 1;
}
}
if (baa) {
int opt = 0160;
find_alignment(sb, &opt);
output(sb, opt);
die("Baa %d!", baa);
}
}
static unsigned parse_score(const char *arg)
{
char *end;
unsigned long score = strtoul(arg, &end, 10);
if (*end)
return 0;
return score;
}
static const char *add_prefix(const char *prefix, const char *path)
{
return prefix_path(prefix, prefix ? strlen(prefix) : 0, path);
}
static int git_blame_config(const char *var, const char *value, void *cb)
{
if (!strcmp(var, "blame.showroot")) {
show_root = git_config_bool(var, value);
return 0;
}
if (!strcmp(var, "blame.blankboundary")) {
blank_boundary = git_config_bool(var, value);
return 0;
}
if (!strcmp(var, "blame.showemail")) {
int *output_option = cb;
if (git_config_bool(var, value))
*output_option |= OUTPUT_SHOW_EMAIL;
else
*output_option &= ~OUTPUT_SHOW_EMAIL;
return 0;
}
if (!strcmp(var, "blame.date")) {
if (!value)
return config_error_nonbool(var);
parse_date_format(value, &blame_date_mode);
return 0;
}
if (userdiff_config(var, value) < 0)
return -1;
return git_default_config(var, value, cb);
}
static void verify_working_tree_path(struct commit *work_tree, const char *path)
{
struct commit_list *parents;
int pos;
for (parents = work_tree->parents; parents; parents = parents->next) {
const unsigned char *commit_sha1 = parents->item->object.oid.hash;
unsigned char blob_sha1[20];
unsigned mode;
if (!get_tree_entry(commit_sha1, path, blob_sha1, &mode) &&
sha1_object_info(blob_sha1, NULL) == OBJ_BLOB)
return;
}
pos = cache_name_pos(path, strlen(path));
if (pos >= 0)
; /* path is in the index */
else if (!strcmp(active_cache[-1 - pos]->name, path))
; /* path is in the index, unmerged */
else
die("no such path '%s' in HEAD", path);
}
static struct commit_list **append_parent(struct commit_list **tail, const unsigned char *sha1)
{
struct commit *parent;
parent = lookup_commit_reference(sha1);
if (!parent)
die("no such commit %s", sha1_to_hex(sha1));
return &commit_list_insert(parent, tail)->next;
}
static void append_merge_parents(struct commit_list **tail)
{
int merge_head;
struct strbuf line = STRBUF_INIT;
merge_head = open(git_path_merge_head(), O_RDONLY);
if (merge_head < 0) {
if (errno == ENOENT)
return;
die("cannot open '%s' for reading", git_path_merge_head());
}
while (!strbuf_getwholeline_fd(&line, merge_head, '\n')) {
unsigned char sha1[20];
if (line.len < 40 || get_sha1_hex(line.buf, sha1))
die("unknown line in '%s': %s", git_path_merge_head(), line.buf);
tail = append_parent(tail, sha1);
}
close(merge_head);
strbuf_release(&line);
}
/*
* This isn't as simple as passing sb->buf and sb->len, because we
* want to transfer ownership of the buffer to the commit (so we
* must use detach).
*/
static void set_commit_buffer_from_strbuf(struct commit *c, struct strbuf *sb)
{
size_t len;
void *buf = strbuf_detach(sb, &len);
set_commit_buffer(c, buf, len);
}
/*
* Prepare a dummy commit that represents the work tree (or staged) item.
* Note that annotating work tree item never works in the reverse.
*/
static struct commit *fake_working_tree_commit(struct diff_options *opt,
const char *path,
const char *contents_from)
{
struct commit *commit;
struct origin *origin;
struct commit_list **parent_tail, *parent;
unsigned char head_sha1[20];
struct strbuf buf = STRBUF_INIT;
const char *ident;
time_t now;
int size, len;
struct cache_entry *ce;
unsigned mode;
struct strbuf msg = STRBUF_INIT;
read_cache();
time(&now);
commit = alloc_commit_node();
commit->object.parsed = 1;
commit->date = now;
parent_tail = &commit->parents;
if (!resolve_ref_unsafe("HEAD", RESOLVE_REF_READING, head_sha1, NULL))
die("no such ref: HEAD");
parent_tail = append_parent(parent_tail, head_sha1);
append_merge_parents(parent_tail);
verify_working_tree_path(commit, path);
origin = make_origin(commit, path);
ident = fmt_ident("Not Committed Yet", "not.committed.yet", NULL, 0);
strbuf_addstr(&msg, "tree 0000000000000000000000000000000000000000\n");
for (parent = commit->parents; parent; parent = parent->next)
strbuf_addf(&msg, "parent %s\n",
oid_to_hex(&parent->item->object.oid));
strbuf_addf(&msg,
"author %s\n"
"committer %s\n\n"
"Version of %s from %s\n",
ident, ident, path,
(!contents_from ? path :
(!strcmp(contents_from, "-") ? "standard input" : contents_from)));
set_commit_buffer_from_strbuf(commit, &msg);
if (!contents_from || strcmp("-", contents_from)) {
struct stat st;
const char *read_from;
char *buf_ptr;
unsigned long buf_len;
if (contents_from) {
if (stat(contents_from, &st) < 0)
die_errno("Cannot stat '%s'", contents_from);
read_from = contents_from;
}
else {
if (lstat(path, &st) < 0)
die_errno("Cannot lstat '%s'", path);
read_from = path;
}
mode = canon_mode(st.st_mode);
switch (st.st_mode & S_IFMT) {
case S_IFREG:
if (DIFF_OPT_TST(opt, ALLOW_TEXTCONV) &&
textconv_object(read_from, mode, null_sha1, 0, &buf_ptr, &buf_len))
strbuf_attach(&buf, buf_ptr, buf_len, buf_len + 1);
else if (strbuf_read_file(&buf, read_from, st.st_size) != st.st_size)
die_errno("cannot open or read '%s'", read_from);
break;
case S_IFLNK:
if (strbuf_readlink(&buf, read_from, st.st_size) < 0)
die_errno("cannot readlink '%s'", read_from);
break;
default:
die("unsupported file type %s", read_from);
}
}
else {
/* Reading from stdin */
mode = 0;
if (strbuf_read(&buf, 0, 0) < 0)
die_errno("failed to read from stdin");
}
convert_to_git(path, buf.buf, buf.len, &buf, 0);
origin->file.ptr = buf.buf;
origin->file.size = buf.len;
pretend_sha1_file(buf.buf, buf.len, OBJ_BLOB, origin->blob_sha1);
/*
* Read the current index, replace the path entry with
* origin->blob_sha1 without mucking with its mode or type
* bits; we are not going to write this index out -- we just
* want to run "diff-index --cached".
*/
discard_cache();
read_cache();
len = strlen(path);
if (!mode) {
int pos = cache_name_pos(path, len);
if (0 <= pos)
mode = active_cache[pos]->ce_mode;
else
/* Let's not bother reading from HEAD tree */
mode = S_IFREG | 0644;
}
size = cache_entry_size(len);
ce = xcalloc(1, size);
hashcpy(ce->sha1, origin->blob_sha1);
memcpy(ce->name, path, len);
ce->ce_flags = create_ce_flags(0);
ce->ce_namelen = len;
ce->ce_mode = create_ce_mode(mode);
add_cache_entry(ce, ADD_CACHE_OK_TO_ADD|ADD_CACHE_OK_TO_REPLACE);
cache_tree_invalidate_path(&the_index, path);
return commit;
}
static struct commit *find_single_final(struct rev_info *revs,
const char **name_p)
{
int i;
struct commit *found = NULL;
const char *name = NULL;
for (i = 0; i < revs->pending.nr; i++) {
struct object *obj = revs->pending.objects[i].item;
if (obj->flags & UNINTERESTING)
continue;
obj = deref_tag(obj, NULL, 0);
if (obj->type != OBJ_COMMIT)
die("Non commit %s?", revs->pending.objects[i].name);
if (found)
die("More than one commit to dig from %s and %s?",
revs->pending.objects[i].name, name);
found = (struct commit *)obj;
name = revs->pending.objects[i].name;
}
if (name_p)
*name_p = name;
return found;
}
static char *prepare_final(struct scoreboard *sb)
{
const char *name;
sb->final = find_single_final(sb->revs, &name);
return xstrdup_or_null(name);
}
static char *prepare_initial(struct scoreboard *sb)
{
int i;
const char *final_commit_name = NULL;
struct rev_info *revs = sb->revs;
/*
* There must be one and only one negative commit, and it must be
* the boundary.
*/
for (i = 0; i < revs->pending.nr; i++) {
struct object *obj = revs->pending.objects[i].item;
if (!(obj->flags & UNINTERESTING))
continue;
obj = deref_tag(obj, NULL, 0);
if (obj->type != OBJ_COMMIT)
die("Non commit %s?", revs->pending.objects[i].name);
if (sb->final)
die("More than one commit to dig down to %s and %s?",
revs->pending.objects[i].name,
final_commit_name);
sb->final = (struct commit *) obj;
final_commit_name = revs->pending.objects[i].name;
}
if (!final_commit_name)
die("No commit to dig down to?");
return xstrdup(final_commit_name);
}
static int blame_copy_callback(const struct option *option, const char *arg, int unset)
{
int *opt = option->value;
/*
* -C enables copy from removed files;
* -C -C enables copy from existing files, but only
* when blaming a new file;
* -C -C -C enables copy from existing files for
* everybody
*/
if (*opt & PICKAXE_BLAME_COPY_HARDER)
*opt |= PICKAXE_BLAME_COPY_HARDEST;
if (*opt & PICKAXE_BLAME_COPY)
*opt |= PICKAXE_BLAME_COPY_HARDER;
*opt |= PICKAXE_BLAME_COPY | PICKAXE_BLAME_MOVE;
if (arg)
blame_copy_score = parse_score(arg);
return 0;
}
static int blame_move_callback(const struct option *option, const char *arg, int unset)
{
int *opt = option->value;
*opt |= PICKAXE_BLAME_MOVE;
if (arg)
blame_move_score = parse_score(arg);
return 0;
}
int cmd_blame(int argc, const char **argv, const char *prefix)
{
struct rev_info revs;
const char *path;
struct scoreboard sb;
struct origin *o;
struct blame_entry *ent = NULL;
long dashdash_pos, lno;
char *final_commit_name = NULL;
enum object_type type;
struct commit *final_commit = NULL;
struct string_list range_list = STRING_LIST_INIT_NODUP;
int output_option = 0, opt = 0;
int show_stats = 0;
const char *revs_file = NULL;
const char *contents_from = NULL;
const struct option options[] = {
OPT_BOOL(0, "incremental", &incremental, N_("Show blame entries as we find them, incrementally")),
OPT_BOOL('b', NULL, &blank_boundary, N_("Show blank SHA-1 for boundary commits (Default: off)")),
OPT_BOOL(0, "root", &show_root, N_("Do not treat root commits as boundaries (Default: off)")),
OPT_BOOL(0, "show-stats", &show_stats, N_("Show work cost statistics")),
OPT_BOOL(0, "progress", &show_progress, N_("Force progress reporting")),
OPT_BIT(0, "score-debug", &output_option, N_("Show output score for blame entries"), OUTPUT_SHOW_SCORE),
OPT_BIT('f', "show-name", &output_option, N_("Show original filename (Default: auto)"), OUTPUT_SHOW_NAME),
OPT_BIT('n', "show-number", &output_option, N_("Show original linenumber (Default: off)"), OUTPUT_SHOW_NUMBER),
OPT_BIT('p', "porcelain", &output_option, N_("Show in a format designed for machine consumption"), OUTPUT_PORCELAIN),
OPT_BIT(0, "line-porcelain", &output_option, N_("Show porcelain format with per-line commit information"), OUTPUT_PORCELAIN|OUTPUT_LINE_PORCELAIN),
OPT_BIT('c', NULL, &output_option, N_("Use the same output mode as git-annotate (Default: off)"), OUTPUT_ANNOTATE_COMPAT),
OPT_BIT('t', NULL, &output_option, N_("Show raw timestamp (Default: off)"), OUTPUT_RAW_TIMESTAMP),
OPT_BIT('l', NULL, &output_option, N_("Show long commit SHA1 (Default: off)"), OUTPUT_LONG_OBJECT_NAME),
OPT_BIT('s', NULL, &output_option, N_("Suppress author name and timestamp (Default: off)"), OUTPUT_NO_AUTHOR),
OPT_BIT('e', "show-email", &output_option, N_("Show author email instead of name (Default: off)"), OUTPUT_SHOW_EMAIL),
OPT_BIT('w', NULL, &xdl_opts, N_("Ignore whitespace differences"), XDF_IGNORE_WHITESPACE),
OPT_BIT(0, "minimal", &xdl_opts, N_("Spend extra cycles to find better match"), XDF_NEED_MINIMAL),
OPT_STRING('S', NULL, &revs_file, N_("file"), N_("Use revisions from <file> instead of calling git-rev-list")),
OPT_STRING(0, "contents", &contents_from, N_("file"), N_("Use <file>'s contents as the final image")),
{ OPTION_CALLBACK, 'C', NULL, &opt, N_("score"), N_("Find line copies within and across files"), PARSE_OPT_OPTARG, blame_copy_callback },
{ OPTION_CALLBACK, 'M', NULL, &opt, N_("score"), N_("Find line movements within and across files"), PARSE_OPT_OPTARG, blame_move_callback },
OPT_STRING_LIST('L', NULL, &range_list, N_("n,m"), N_("Process only line range n,m, counting from 1")),
OPT__ABBREV(&abbrev),
OPT_END()
};
struct parse_opt_ctx_t ctx;
int cmd_is_annotate = !strcmp(argv[0], "annotate");
struct range_set ranges;
unsigned int range_i;
long anchor;
git_config(git_blame_config, &output_option);
init_revisions(&revs, NULL);
revs.date_mode = blame_date_mode;
DIFF_OPT_SET(&revs.diffopt, ALLOW_TEXTCONV);
DIFF_OPT_SET(&revs.diffopt, FOLLOW_RENAMES);
save_commit_buffer = 0;
dashdash_pos = 0;
show_progress = -1;
parse_options_start(&ctx, argc, argv, prefix, options,
PARSE_OPT_KEEP_DASHDASH | PARSE_OPT_KEEP_ARGV0);
for (;;) {
switch (parse_options_step(&ctx, options, blame_opt_usage)) {
case PARSE_OPT_HELP:
exit(129);
case PARSE_OPT_DONE:
if (ctx.argv[0])
dashdash_pos = ctx.cpidx;
goto parse_done;
}
if (!strcmp(ctx.argv[0], "--reverse")) {
ctx.argv[0] = "--children";
reverse = 1;
}
parse_revision_opt(&revs, &ctx, options, blame_opt_usage);
}
parse_done:
no_whole_file_rename = !DIFF_OPT_TST(&revs.diffopt, FOLLOW_RENAMES);
DIFF_OPT_CLR(&revs.diffopt, FOLLOW_RENAMES);
argc = parse_options_end(&ctx);
if (incremental || (output_option & OUTPUT_PORCELAIN)) {
if (show_progress > 0)
die("--progress can't be used with --incremental or porcelain formats");
show_progress = 0;
} else if (show_progress < 0)
show_progress = isatty(2);
if (0 < abbrev)
/* one more abbrev length is needed for the boundary commit */
abbrev++;
if (revs_file && read_ancestry(revs_file))
die_errno("reading graft file '%s' failed", revs_file);
if (cmd_is_annotate) {
output_option |= OUTPUT_ANNOTATE_COMPAT;
blame_date_mode.type = DATE_ISO8601;
} else {
blame_date_mode = revs.date_mode;
}
/* The maximum width used to show the dates */
switch (blame_date_mode.type) {
case DATE_RFC2822:
blame_date_width = sizeof("Thu, 19 Oct 2006 16:00:04 -0700");
break;
case DATE_ISO8601_STRICT:
blame_date_width = sizeof("2006-10-19T16:00:04-07:00");
break;
case DATE_ISO8601:
blame_date_width = sizeof("2006-10-19 16:00:04 -0700");
break;
case DATE_RAW:
blame_date_width = sizeof("1161298804 -0700");
break;
case DATE_SHORT:
blame_date_width = sizeof("2006-10-19");
break;
case DATE_RELATIVE:
/* TRANSLATORS: This string is used to tell us the maximum
display width for a relative timestamp in "git blame"
output. For C locale, "4 years, 11 months ago", which
takes 22 places, is the longest among various forms of
relative timestamps, but your language may need more or
fewer display columns. */
blame_date_width = utf8_strwidth(_("4 years, 11 months ago")) + 1; /* add the null */
break;
case DATE_NORMAL:
blame_date_width = sizeof("Thu Oct 19 16:00:04 2006 -0700");
break;
case DATE_STRFTIME:
blame_date_width = strlen(show_date(0, 0, &blame_date_mode)) + 1; /* add the null */
break;
}
blame_date_width -= 1; /* strip the null */
if (DIFF_OPT_TST(&revs.diffopt, FIND_COPIES_HARDER))
opt |= (PICKAXE_BLAME_COPY | PICKAXE_BLAME_MOVE |
PICKAXE_BLAME_COPY_HARDER);
if (!blame_move_score)
blame_move_score = BLAME_DEFAULT_MOVE_SCORE;
if (!blame_copy_score)
blame_copy_score = BLAME_DEFAULT_COPY_SCORE;
/*
* We have collected options unknown to us in argv[1..unk]
* which are to be passed to revision machinery if we are
* going to do the "bottom" processing.
*
* The remaining are:
*
* (1) if dashdash_pos != 0, it is either
* "blame [revisions] -- <path>" or
* "blame -- <path> <rev>"
*
* (2) otherwise, it is one of the two:
* "blame [revisions] <path>"
* "blame <path> <rev>"
*
* Note that we must strip out <path> from the arguments: we do not
* want the path pruning but we may want "bottom" processing.
*/
if (dashdash_pos) {
switch (argc - dashdash_pos - 1) {
case 2: /* (1b) */
if (argc != 4)
usage_with_options(blame_opt_usage, options);
/* reorder for the new way: <rev> -- <path> */
argv[1] = argv[3];
argv[3] = argv[2];
argv[2] = "--";
/* FALLTHROUGH */
case 1: /* (1a) */
path = add_prefix(prefix, argv[--argc]);
argv[argc] = NULL;
break;
default:
usage_with_options(blame_opt_usage, options);
}
} else {
if (argc < 2)
usage_with_options(blame_opt_usage, options);
path = add_prefix(prefix, argv[argc - 1]);
if (argc == 3 && !file_exists(path)) { /* (2b) */
path = add_prefix(prefix, argv[1]);
argv[1] = argv[2];
}
argv[argc - 1] = "--";
setup_work_tree();
if (!file_exists(path))
die_errno("cannot stat path '%s'", path);
}
revs.disable_stdin = 1;
setup_revisions(argc, argv, &revs, NULL);
memset(&sb, 0, sizeof(sb));
sb.revs = &revs;
if (!reverse) {
final_commit_name = prepare_final(&sb);
sb.commits.compare = compare_commits_by_commit_date;
}
else if (contents_from)
die("--contents and --reverse do not blend well.");
else {
final_commit_name = prepare_initial(&sb);
sb.commits.compare = compare_commits_by_reverse_commit_date;
if (revs.first_parent_only)
revs.children.name = NULL;
}
if (!sb.final) {
/*
* "--not A B -- path" without anything positive;
* do not default to HEAD, but use the working tree
* or "--contents".
*/
setup_work_tree();
sb.final = fake_working_tree_commit(&sb.revs->diffopt,
path, contents_from);
add_pending_object(&revs, &(sb.final->object), ":");
}
else if (contents_from)
die("Cannot use --contents with final commit object name");
if (reverse && revs.first_parent_only) {
final_commit = find_single_final(sb.revs, NULL);
if (!final_commit)
die("--reverse and --first-parent together require specified latest commit");
}
/*
* If we have bottom, this will mark the ancestors of the
* bottom commits we would reach while traversing as
* uninteresting.
*/
if (prepare_revision_walk(&revs))
die(_("revision walk setup failed"));
if (reverse && revs.first_parent_only) {
struct commit *c = final_commit;
sb.revs->children.name = "children";
while (c->parents &&
oidcmp(&c->object.oid, &sb.final->object.oid)) {
struct commit_list *l = xcalloc(1, sizeof(*l));
l->item = c;
if (add_decoration(&sb.revs->children,
&c->parents->item->object, l))
die("BUG: not unique item in first-parent chain");
c = c->parents->item;
}
if (oidcmp(&c->object.oid, &sb.final->object.oid))
die("--reverse --first-parent together require range along first-parent chain");
}
if (is_null_oid(&sb.final->object.oid)) {
o = sb.final->util;
sb.final_buf = xmemdupz(o->file.ptr, o->file.size);
sb.final_buf_size = o->file.size;
}
else {
o = get_origin(&sb, sb.final, path);
if (fill_blob_sha1_and_mode(o))
die("no such path %s in %s", path, final_commit_name);
if (DIFF_OPT_TST(&sb.revs->diffopt, ALLOW_TEXTCONV) &&
textconv_object(path, o->mode, o->blob_sha1, 1, (char **) &sb.final_buf,
&sb.final_buf_size))
;
else
sb.final_buf = read_sha1_file(o->blob_sha1, &type,
&sb.final_buf_size);
if (!sb.final_buf)
die("Cannot read blob %s for path %s",
sha1_to_hex(o->blob_sha1),
path);
}
num_read_blob++;
lno = prepare_lines(&sb);
if (lno && !range_list.nr)
string_list_append(&range_list, xstrdup("1"));
anchor = 1;
range_set_init(&ranges, range_list.nr);
for (range_i = 0; range_i < range_list.nr; ++range_i) {
long bottom, top;
if (parse_range_arg(range_list.items[range_i].string,
nth_line_cb, &sb, lno, anchor,
&bottom, &top, sb.path))
usage(blame_usage);
if (lno < top || ((lno || bottom) && lno < bottom))
die("file %s has only %lu lines", path, lno);
if (bottom < 1)
bottom = 1;
if (top < 1)
top = lno;
bottom--;
range_set_append_unsafe(&ranges, bottom, top);
anchor = top + 1;
}
sort_and_merge_range_set(&ranges);
for (range_i = ranges.nr; range_i > 0; --range_i) {
const struct range *r = &ranges.ranges[range_i - 1];
long bottom = r->start;
long top = r->end;
struct blame_entry *next = ent;
ent = xcalloc(1, sizeof(*ent));
ent->lno = bottom;
ent->num_lines = top - bottom;
ent->suspect = o;
ent->s_lno = bottom;
ent->next = next;
origin_incref(o);
}
o->suspects = ent;
prio_queue_put(&sb.commits, o->commit);
origin_decref(o);
range_set_release(&ranges);
string_list_clear(&range_list, 0);
sb.ent = NULL;
sb.path = path;
read_mailmap(&mailmap, NULL);
assign_blame(&sb, opt);
if (!incremental)
setup_pager();
free(final_commit_name);
if (incremental)
return 0;
sb.ent = blame_sort(sb.ent, compare_blame_final);
coalesce(&sb);
if (!(output_option & OUTPUT_PORCELAIN))
find_alignment(&sb, &output_option);
output(&sb, output_option);
free((void *)sb.final_buf);
for (ent = sb.ent; ent; ) {
struct blame_entry *e = ent->next;
free(ent);
ent = e;
}
if (show_stats) {
printf("num read blob: %d\n", num_read_blob);
printf("num get patch: %d\n", num_get_patch);
printf("num commits: %d\n", num_commits);
}
return 0;
}
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