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git/builtin/blame.c

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/*
* Blame
*
* Copyright (c) 2006, Junio C Hamano
*/
#include "cache.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 "parse-options.h"
#include "utf8.h"
#include "userdiff.h"
static char blame_usage[] = "git blame [options] [rev-opts] [rev] [--] file";
static const char *blame_opt_usage[] = {
blame_usage,
"",
"[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 enum date_mode blame_date_mode = DATE_ISO8601;
static size_t blame_date_width;
static struct string_list mailmap;
#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
/* bits #0..7 in revision.h, #8..11 used for merge_bases() in commit.c */
#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;
struct origin *previous;
struct commit *commit;
mmfile_t file;
unsigned char blob_sha1[20];
unsigned mode;
char path[FLEX_ARRAY];
};
/*
* 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,
char **buf,
unsigned long *buf_size)
{
struct diff_filespec *df;
struct userdiff_driver *textconv;
df = alloc_filespec(path);
fill_filespec(df, sha1, 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, &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) {
if (o->previous)
origin_decref(o->previous);
free(o->file.ptr);
free(o);
}
}
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 form a linked list in the
* scoreboard structure, sorted by the target line number.
*/
struct blame_entry {
struct blame_entry *prev;
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;
/* true if the suspect is truly guilty; false while we have not
* checked if the group came from one of its parents.
*/
char guilty;
/* true if the entry has been scanned for copies in the current parent
*/
char scanned;
/* 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;
};
/*
* The current state of the blame assignment.
*/
struct scoreboard {
/* the final commit (i.e. where we started digging from) */
struct commit *final;
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 inline int same_suspect(struct origin *a, struct origin *b)
{
if (a == b)
return 1;
if (a->commit != b->commit)
return 0;
return !strcmp(a->path, b->path);
}
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 (same_suspect(ent->suspect, next->suspect) &&
ent->guilty == next->guilty &&
ent->s_lno + ent->num_lines == next->s_lno) {
ent->num_lines += next->num_lines;
ent->next = next->next;
if (ent->next)
ent->next->prev = ent;
origin_decref(next->suspect);
free(next);
ent->score = 0;
next = ent; /* again */
}
}
if (DEBUG) /* sanity */
sanity_check_refcnt(sb);
}
/*
* 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;
o = xcalloc(1, sizeof(*o) + strlen(path) + 1);
o->commit = commit;
o->refcnt = 1;
strcpy(o->path, path);
return o;
}
/*
* Locate an existing origin or create a new one.
*/
static struct origin *get_origin(struct scoreboard *sb,
struct commit *commit,
const char *path)
{
struct blame_entry *e;
for (e = sb->ent; e; e = e->next) {
if (e->suspect->commit == commit &&
!strcmp(e->suspect->path, path))
return origin_incref(e->suspect);
}
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.sha1,
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 = NULL;
struct diff_options diff_opts;
const char *paths[2];
if (parent->util) {
/*
* Each commit object can cache one origin in that
* commit. This is a freestanding copy of origin and
* not refcounted.
*/
struct origin *cached = parent->util;
if (!strcmp(cached->path, origin->path)) {
/*
* The same path between origin and its parent
* without renaming -- the most common case.
*/
porigin = get_origin(sb, parent, cached->path);
/*
* If the origin was newly created (i.e. get_origin
* would call make_origin if none is found in the
* scoreboard), it does not know the blob_sha1/mode,
* so copy it. Otherwise porigin was in the
* scoreboard and already knows blob_sha1/mode.
*/
if (porigin->refcnt == 1) {
hashcpy(porigin->blob_sha1, cached->blob_sha1);
porigin->mode = cached->mode;
}
return porigin;
}
/* otherwise it was not very useful; free it */
free(parent->util);
parent->util = NULL;
}
/* 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;
diff_tree_setup_paths(paths, &diff_opts);
if (diff_setup_done(&diff_opts) < 0)
die("diff-setup");
if (is_null_sha1(origin->commit->object.sha1))
do_diff_cache(parent->tree->object.sha1, &diff_opts);
else
diff_tree_sha1(parent->tree->object.sha1,
origin->commit->tree->object.sha1,
"", &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->sha1);
porigin->mode = p->one->mode;
break;
case 'A':
case 'T':
/* Did not exist in parent, or type changed */
break;
}
}
diff_flush(&diff_opts);
diff_tree_release_paths(&diff_opts);
if (porigin) {
/*
* Create a freestanding copy that is not part of
* the refcounted origin found in the scoreboard, and
* cache it in the commit.
*/
struct origin *cached;
cached = make_origin(porigin->commit, porigin->path);
hashcpy(cached->blob_sha1, porigin->blob_sha1);
cached->mode = porigin->mode;
parent->util = cached;
}
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;
const char *paths[2];
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;
paths[0] = NULL;
diff_tree_setup_paths(paths, &diff_opts);
if (diff_setup_done(&diff_opts) < 0)
die("diff-setup");
if (is_null_sha1(origin->commit->object.sha1))
do_diff_cache(parent->tree->object.sha1, &diff_opts);
else
diff_tree_sha1(parent->tree->object.sha1,
origin->commit->tree->object.sha1,
"", &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->sha1);
porigin->mode = p->one->mode;
break;
}
}
diff_flush(&diff_opts);
diff_tree_release_paths(&diff_opts);
return porigin;
}
/*
* Link in a new blame entry to the scoreboard. Entries that cover the
* same line range have been removed from the scoreboard previously.
*/
static void add_blame_entry(struct scoreboard *sb, struct blame_entry *e)
{
struct blame_entry *ent, *prev = NULL;
origin_incref(e->suspect);
for (ent = sb->ent; ent && ent->lno < e->lno; ent = ent->next)
prev = ent;
/* prev, if not NULL, is the last one that is below e */
e->prev = prev;
if (prev) {
e->next = prev->next;
prev->next = e;
}
else {
e->next = sb->ent;
sb->ent = e;
}
if (e->next)
e->next->prev = e;
}
/*
* src typically is on-stack; we want to copy the information in it to
* a malloced blame_entry that is already on the linked list of the
* scoreboard. The origin of dst loses a refcnt while the origin of src
* gains one.
*/
static void dup_entry(struct blame_entry *dst, struct blame_entry *src)
{
struct blame_entry *p, *n;
p = dst->prev;
n = dst->next;
origin_incref(src->suspect);
origin_decref(dst->suspect);
memcpy(dst, src, sizeof(*src));
dst->prev = p;
dst->next = n;
dst->score = 0;
}
static const char *nth_line(struct scoreboard *sb, int lno)
{
return sb->final_buf + sb->lineno[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. Adjust the linked list of blames in the scoreboard to
* reflect the split.
*/
static void split_blame(struct scoreboard *sb,
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(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(sb, 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(sb, 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(e, &split[1]);
else if (split[0].suspect) {
/* me and then parent */
dup_entry(e, &split[0]);
new_entry = xmalloc(sizeof(*new_entry));
memcpy(new_entry, &(split[1]), sizeof(struct blame_entry));
add_blame_entry(sb, new_entry);
}
else {
/* parent and then me */
dup_entry(e, &split[1]);
new_entry = xmalloc(sizeof(*new_entry));
memcpy(new_entry, &(split[2]), sizeof(struct blame_entry));
add_blame_entry(sb, new_entry);
}
if (DEBUG) { /* sanity */
struct blame_entry *ent;
int lno = sb->ent->lno, corrupt = 0;
for (ent = sb->ent; ent; ent = ent->next) {
if (lno != ent->lno)
corrupt = 1;
if (ent->s_lno < 0)
corrupt = 1;
lno += ent->num_lines;
}
if (corrupt) {
lno = sb->ent->lno;
for (ent = sb->ent; ent; ent = ent->next) {
printf("L %8d l %8d n %8d\n",
lno, ent->lno, ent->num_lines);
lno = ent->lno + ent->num_lines;
}
die("oops");
}
}
}
/*
* 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);
}
/*
* Helper for blame_chunk(). blame_entry e is known to overlap with
* the patch hunk; split it and pass blame to the parent.
*/
static void blame_overlap(struct scoreboard *sb, struct blame_entry *e,
int tlno, int plno, int same,
struct origin *parent)
{
struct blame_entry split[3];
split_overlap(split, e, tlno, plno, same, parent);
if (split[1].suspect)
split_blame(sb, split, e);
decref_split(split);
}
/*
* Find the line number of the last line the target is suspected for.
*/
static int find_last_in_target(struct scoreboard *sb, struct origin *target)
{
struct blame_entry *e;
int last_in_target = -1;
for (e = sb->ent; e; e = e->next) {
if (e->guilty || !same_suspect(e->suspect, target))
continue;
if (last_in_target < e->s_lno + e->num_lines)
last_in_target = e->s_lno + e->num_lines;
}
return last_in_target;
}
/*
* Process one hunk from the patch between the current suspect for
* blame_entry e and its parent. Find and split the overlap, and
* pass blame to the overlapping part to the parent.
*/
static void blame_chunk(struct scoreboard *sb,
int tlno, int plno, int same,
struct origin *target, struct origin *parent)
{
struct blame_entry *e;
for (e = sb->ent; e; e = e->next) {
if (e->guilty || !same_suspect(e->suspect, target))
continue;
if (same <= e->s_lno)
continue;
if (tlno < e->s_lno + e->num_lines)
blame_overlap(sb, e, tlno, plno, same, parent);
}
}
struct blame_chunk_cb_data {
struct scoreboard *sb;
struct origin *target;
struct origin *parent;
long plno;
long tlno;
};
static void blame_chunk_cb(void *data, long same, long p_next, long t_next)
{
struct blame_chunk_cb_data *d = data;
blame_chunk(d->sb, d->tlno, d->plno, same, d->target, d->parent);
d->plno = p_next;
d->tlno = t_next;
}
/*
* 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 int pass_blame_to_parent(struct scoreboard *sb,
struct origin *target,
struct origin *parent)
{
int last_in_target;
mmfile_t file_p, file_o;
struct blame_chunk_cb_data d;
xpparam_t xpp;
xdemitconf_t xecfg;
memset(&d, 0, sizeof(d));
d.sb = sb; d.target = target; d.parent = parent;
last_in_target = find_last_in_target(sb, target);
if (last_in_target < 0)
return 1; /* nothing remains for this target */
fill_origin_blob(&sb->revs->diffopt, parent, &file_p);
fill_origin_blob(&sb->revs->diffopt, target, &file_o);
num_get_patch++;
memset(&xpp, 0, sizeof(xpp));
xpp.flags = xdl_opts;
memset(&xecfg, 0, sizeof(xecfg));
xecfg.ctxlen = 0;
xdi_diff_hunks(&file_p, &file_o, blame_chunk_cb, &d, &xpp, &xecfg);
/* The rest (i.e. anything after tlno) are the same as the parent */
blame_chunk(sb, d.tlno, d.plno, last_in_target, target, parent);
return 0;
}
/*
* 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 void handle_split_cb(void *data, long same, long p_next, long t_next)
{
struct handle_split_cb_data *d = data;
handle_split(d->sb, d->ent, d->tlno, d->plno, same, d->parent, d->split);
d->plno = p_next;
d->tlno = t_next;
}
/*
* 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;
int cnt;
mmfile_t file_o;
struct handle_split_cb_data d;
xpparam_t xpp;
xdemitconf_t xecfg;
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;
cnt = ent->num_lines;
while (cnt && cp < sb->final_buf + sb->final_buf_size) {
if (*cp++ == '\n')
cnt--;
}
file_o.size = cp - file_o.ptr;
/*
* file_o is a part of final image we are annotating.
* file_p partially may match that image.
*/
memset(&xpp, 0, sizeof(xpp));
xpp.flags = xdl_opts;
memset(&xecfg, 0, sizeof(xecfg));
xecfg.ctxlen = 1;
memset(split, 0, sizeof(struct blame_entry [3]));
xdi_diff_hunks(file_p, &file_o, handle_split_cb, &d, &xpp, &xecfg);
/* remainder, if any, all match the preimage */
handle_split(sb, ent, d.tlno, d.plno, ent->num_lines, parent, split);
}
/*
* See if lines currently target is suspected for can be attributed to
* parent.
*/
static int find_move_in_parent(struct scoreboard *sb,
struct origin *target,
struct origin *parent)
{
int last_in_target, made_progress;
struct blame_entry *e, split[3];
mmfile_t file_p;
last_in_target = find_last_in_target(sb, target);
if (last_in_target < 0)
return 1; /* nothing remains for this target */
fill_origin_blob(&sb->revs->diffopt, parent, &file_p);
if (!file_p.ptr)
return 0;
made_progress = 1;
while (made_progress) {
made_progress = 0;
for (e = sb->ent; e; e = e->next) {
if (e->guilty || !same_suspect(e->suspect, target) ||
ent_score(sb, e) < blame_move_score)
continue;
find_copy_in_blob(sb, e, parent, split, &file_p);
if (split[1].suspect &&
blame_move_score < ent_score(sb, &split[1])) {
split_blame(sb, split, e);
made_progress = 1;
}
decref_split(split);
}
}
return 0;
}
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 scoreboard *sb,
struct origin *target,
int min_score,
int *num_ents_p)
{
struct blame_entry *e;
int num_ents, i;
struct blame_list *blame_list = NULL;
for (e = sb->ent, num_ents = 0; e; e = e->next)
if (!e->scanned && !e->guilty &&
same_suspect(e->suspect, target) &&
min_score < ent_score(sb, e))
num_ents++;
if (num_ents) {
blame_list = xcalloc(num_ents, sizeof(struct blame_list));
for (e = sb->ent, i = 0; e; e = e->next)
if (!e->scanned && !e->guilty &&
same_suspect(e->suspect, target) &&
min_score < ent_score(sb, e))
blame_list[i++].ent = e;
}
*num_ents_p = num_ents;
return blame_list;
}
/*
* Reset the scanned status on all entries.
*/
static void reset_scanned_flag(struct scoreboard *sb)
{
struct blame_entry *e;
for (e = sb->ent; e; e = e->next)
e->scanned = 0;
}
/*
* 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 int find_copy_in_parent(struct scoreboard *sb,
struct origin *target,
struct commit *parent,
struct origin *porigin,
int opt)
{
struct diff_options diff_opts;
const char *paths[1];
int i, j;
int retval;
struct blame_list *blame_list;
int num_ents;
blame_list = setup_blame_list(sb, target, blame_copy_score, &num_ents);
if (!blame_list)
return 1; /* nothing remains for this target */
diff_setup(&diff_opts);
DIFF_OPT_SET(&diff_opts, RECURSIVE);
diff_opts.output_format = DIFF_FORMAT_NO_OUTPUT;
paths[0] = NULL;
diff_tree_setup_paths(paths, &diff_opts);
if (diff_setup_done(&diff_opts) < 0)
die("diff-setup");
/* 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_sha1(target->commit->object.sha1))
do_diff_cache(parent->tree->object.sha1, &diff_opts);
else
diff_tree_sha1(parent->tree->object.sha1,
target->commit->tree->object.sha1,
"", &diff_opts);
if (!DIFF_OPT_TST(&diff_opts, FIND_COPIES_HARDER))
diffcore_std(&diff_opts);
retval = 0;
while (1) {
int made_progress = 0;
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->sha1);
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(sb, split, blame_list[j].ent);
made_progress = 1;
}
else
blame_list[j].ent->scanned = 1;
decref_split(split);
}
free(blame_list);
if (!made_progress)
break;
blame_list = setup_blame_list(sb, target, blame_copy_score, &num_ents);
if (!blame_list) {
retval = 1;
break;
}
}
reset_scanned_flag(sb);
diff_flush(&diff_opts);
diff_tree_release_paths(&diff_opts);
return retval;
}
/*
* 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;
if (!porigin->file.ptr && origin->file.ptr) {
/* Steal its file */
porigin->file = origin->file;
origin->file.ptr = NULL;
}
for (e = sb->ent; e; e = e->next) {
if (!same_suspect(e->suspect, origin))
continue;
origin_incref(porigin);
origin_decref(e->suspect);
e->suspect = porigin;
}
}
/*
* 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)
return commit->parents;
return lookup_decoration(&revs->children, &commit->object);
}
static int num_scapegoats(struct rev_info *revs, struct commit *commit)
{
int cnt;
struct commit_list *l = first_scapegoat(revs, commit);
for (cnt = 0; l; l = l->next)
cnt++;
return cnt;
}
#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;
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; 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;
}
if (pass_blame_to_parent(sb, origin, porigin))
goto finish;
}
/*
* Optionally find moves in parents' files.
*/
if (opt & PICKAXE_BLAME_MOVE)
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 (find_move_in_parent(sb, origin, porigin))
goto finish;
}
/*
* Optionally find copies from parents' files.
*/
if (opt & PICKAXE_BLAME_COPY)
for (i = 0, sg = first_scapegoat(revs, commit);
i < num_sg && sg;
sg = sg->next, i++) {
struct origin *porigin = sg_origin[i];
if (find_copy_in_parent(sb, origin, sg->item,
porigin, opt))
goto finish;
}
finish:
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 {
const char *author;
const char *author_mail;
unsigned long author_time;
const char *author_tz;
/* filled only when asked for details */
const char *committer;
const char *committer_mail;
unsigned long committer_time;
const char *committer_tz;
const char *summary;
};
/*
* Parse author/committer line in the commit object buffer
*/
static void get_ac_line(const char *inbuf, const char *what,
int person_len, char *person,
int mail_len, char *mail,
unsigned long *time, const char **tz)
{
int len, tzlen, maillen;
char *tmp, *endp, *timepos, *mailpos;
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 (person_len <= len) {
error_out:
/* Ugh */
*tz = "(unknown)";
strcpy(person, *tz);
strcpy(mail, *tz);
*time = 0;
return;
}
memcpy(person, tmp, len);
tmp = person;
tmp += len;
*tmp = 0;
while (person < tmp && *tmp != ' ')
tmp--;
if (tmp <= person)
goto error_out;
*tz = tmp+1;
tzlen = (person+len)-(tmp+1);
*tmp = 0;
while (person < tmp && *tmp != ' ')
tmp--;
if (tmp <= person)
goto error_out;
*time = strtoul(tmp, NULL, 10);
timepos = tmp;
*tmp = 0;
while (person < tmp && !(*tmp == ' ' && tmp[1] == '<'))
tmp--;
if (tmp <= person)
return;
mailpos = tmp + 1;
*tmp = 0;
maillen = timepos - tmp;
memcpy(mail, mailpos, maillen);
if (!mailmap.nr)
return;
/*
* mailmap expansion may make the name longer.
* make room by pushing stuff down.
*/
tmp = person + person_len - (tzlen + 1);
memmove(tmp, *tz, tzlen);
tmp[tzlen] = 0;
*tz = tmp;
/*
* Now, convert both name and e-mail using mailmap
*/
if (map_user(&mailmap, mail+1, mail_len-1, person, tmp-person-1)) {
/* Add a trailing '>' to email, since map_user returns plain emails
Note: It already has '<', since we replace from mail+1 */
mailpos = memchr(mail, '\0', mail_len);
if (mailpos && mailpos-mail < mail_len - 1) {
*mailpos = '>';
*(mailpos+1) = '\0';
}
}
}
static void get_commit_info(struct commit *commit,
struct commit_info *ret,
int detailed)
{
int len;
const char *subject;
char *reencoded, *message;
static char author_name[1024];
static char author_mail[1024];
static char committer_name[1024];
static char committer_mail[1024];
static char summary_buf[1024];
/*
* We've operated without save_commit_buffer, so
* we now need to populate them for output.
*/
if (!commit->buffer) {
enum object_type type;
unsigned long size;
commit->buffer =
read_sha1_file(commit->object.sha1, &type, &size);
if (!commit->buffer)
die("Cannot read commit %s",
sha1_to_hex(commit->object.sha1));
}
reencoded = reencode_commit_message(commit, NULL);
message = reencoded ? reencoded : commit->buffer;
ret->author = author_name;
ret->author_mail = author_mail;
get_ac_line(message, "\nauthor ",
sizeof(author_name), author_name,
sizeof(author_mail), author_mail,
&ret->author_time, &ret->author_tz);
if (!detailed) {
free(reencoded);
return;
}
ret->committer = committer_name;
ret->committer_mail = committer_mail;
get_ac_line(message, "\ncommitter ",
sizeof(committer_name), committer_name,
sizeof(committer_mail), committer_mail,
&ret->committer_time, &ret->committer_tz);
ret->summary = summary_buf;
len = find_commit_subject(message, &subject);
if (len && len < sizeof(summary_buf)) {
memcpy(summary_buf, subject, len);
summary_buf[len] = 0;
} else {
sprintf(summary_buf, "(%s)", sha1_to_hex(commit->object.sha1));
}
free(reencoded);
}
/*
* 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);
printf("author-mail %s\n", ci.author_mail);
printf("author-time %lu\n", ci.author_time);
printf("author-tz %s\n", ci.author_tz);
printf("committer %s\n", ci.committer);
printf("committer-mail %s\n", ci.committer_mail);
printf("committer-time %lu\n", ci.committer_time);
printf("committer-tz %s\n", ci.committer_tz);
printf("summary %s\n", ci.summary);
if (suspect->commit->object.flags & UNINTERESTING)
printf("boundary\n");
if (suspect->previous) {
struct origin *prev = suspect->previous;
printf("previous %s ", sha1_to_hex(prev->commit->object.sha1));
write_name_quoted(prev->path, stdout, '\n');
}
return 1;
}
/*
* The blame_entry is found to be guilty for the range. Mark it
* as such, and show it in incremental output.
*/
static void found_guilty_entry(struct blame_entry *ent)
{
if (ent->guilty)
return;
ent->guilty = 1;
if (incremental) {
struct origin *suspect = ent->suspect;
printf("%s %d %d %d\n",
sha1_to_hex(suspect->commit->object.sha1),
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");
}
}
/*
* The main loop -- while the scoreboard has lines whose true origin
* is still unknown, pick one blame_entry, and allow its current
* suspect to pass blames to its parents.
*/
static void assign_blame(struct scoreboard *sb, int opt)
{
struct rev_info *revs = sb->revs;
while (1) {
struct blame_entry *ent;
struct commit *commit;
struct origin *suspect = NULL;
/* find one suspect to break down */
for (ent = sb->ent; !suspect && ent; ent = ent->next)
if (!ent->guilty)
suspect = ent->suspect;
if (!suspect)
return; /* all done */
/*
* We will use this suspect later in the loop,
* so hold onto it in the meantime.
*/
origin_incref(suspect);
commit = suspect->commit;
if (!commit->object.parsed)
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 */
for (ent = sb->ent; ent; ent = ent->next)
if (same_suspect(ent->suspect, suspect))
found_guilty_entry(ent);
origin_decref(suspect);
if (DEBUG) /* sanity */
sanity_check_refcnt(sb);
}
}
static const char *format_time(unsigned long time, const char *tz_str,
int show_raw_time)
{
static char time_buf[128];
const char *time_str;
int time_len;
int tz;
if (show_raw_time) {
sprintf(time_buf, "%lu %s", time, tz_str);
}
else {
tz = atoi(tz_str);
time_str = show_date(time, tz, blame_date_mode);
time_len = strlen(time_str);
memcpy(time_buf, time_str, time_len);
memset(time_buf + time_len, ' ', blame_date_width - time_len);
}
return time_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[41];
strcpy(hex, sha1_to_hex(suspect->commit->object.sha1));
printf("%s%c%d %d %d\n",
hex,
ent->guilty ? ' ' : '*', /* purely for debugging */
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[41];
int show_raw_time = !!(opt & OUTPUT_RAW_TIMESTAMP);
get_commit_info(suspect->commit, &ci, 1);
strcpy(hex, sha1_to_hex(suspect->commit->object.sha1));
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;
else
name = ci.author;
printf("\t(%10s\t%10s\t%d)", name,
format_time(ci.author_time, ci.author_tz,
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;
else
name = ci.author;
pad = longest_author - utf8_strwidth(name);
printf(" (%s%*s %10s",
name, pad, "",
format_time(ci.author_time,
ci.author_tz,
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');
}
static void output(struct scoreboard *sb, int option)
{
struct blame_entry *ent;
if (option & OUTPUT_PORCELAIN) {
for (ent = sb->ent; ent; ent = ent->next) {
struct blame_entry *oth;
struct origin *suspect = ent->suspect;
struct commit *commit = suspect->commit;
if (commit->object.flags & MORE_THAN_ONE_PATH)
continue;
for (oth = ent->next; oth; oth = oth->next) {
if ((oth->suspect->commit != commit) ||
!strcmp(oth->suspect->path, suspect->path))
continue;
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);
}
}
}
/*
* 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;
int num = 0, incomplete = 0, bol = 1;
if (len && buf[len-1] != '\n')
incomplete++; /* incomplete line at the end */
while (len--) {
if (bol) {
sb->lineno = xrealloc(sb->lineno,
sizeof(int *) * (num + 1));
sb->lineno[num] = buf - sb->final_buf;
bol = 0;
}
if (*buf++ == '\n') {
num++;
bol = 1;
}
}
sb->lineno = xrealloc(sb->lineno,
sizeof(int *) * (num + incomplete + 1));
sb->lineno[num + incomplete] = buf - sb->final_buf;
sb->num_lines = num + incomplete;
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");
char buf[1024];
if (!fp)
return -1;
while (fgets(buf, sizeof(buf), fp)) {
/* The format is just "Commit Parent1 Parent2 ...\n" */
int len = strlen(buf);
struct commit_graft *graft = read_graft_line(buf, len);
if (graft)
register_commit_graft(graft, 0);
}
fclose(fp);
return 0;
}
/*
* How many columns do we need to show line numbers in decimal?
*/
static int lineno_width(int lines)
{
int i, width;
for (width = 1, i = 10; i <= lines; width++)
i *= 10;
return width;
}
/*
* 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;
for (e = sb->ent; e; e = e->next) {
struct origin *suspect = e->suspect;
struct commit_info ci;
int num;
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)) {
suspect->commit->object.flags |= METAINFO_SHOWN;
get_commit_info(suspect->commit, &ci, 1);
if (*option & OUTPUT_SHOW_EMAIL)
num = utf8_strwidth(ci.author_mail);
else
num = utf8_strwidth(ci.author);
if (longest_author < num)
longest_author = num;
}
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 = lineno_width(longest_src_lines);
max_digits = lineno_width(longest_dst_lines);
max_score_digits = lineno_width(largest_score);
}
/*
* 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,
sha1_to_hex(ent->suspect->commit->object.sha1),
ent->suspect->refcnt);
baa = 1;
}
}
if (baa) {
int opt = 0160;
find_alignment(sb, &opt);
output(sb, opt);
die("Baa %d!", baa);
}
}
/*
* Used for the command line parsing; check if the path exists
* in the working tree.
*/
static int has_string_in_work_tree(const char *path)
{
struct stat st;
return !lstat(path, &st);
}
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);
}
/*
* Parsing of (comma separated) one item in the -L option
*/
static const char *parse_loc(const char *spec,
struct scoreboard *sb, long lno,
long begin, long *ret)
{
char *term;
const char *line;
long num;
int reg_error;
regex_t regexp;
regmatch_t match[1];
/* Allow "-L <something>,+20" to mean starting at <something>
* for 20 lines, or "-L <something>,-5" for 5 lines ending at
* <something>.
*/
if (1 < begin && (spec[0] == '+' || spec[0] == '-')) {
num = strtol(spec + 1, &term, 10);
if (term != spec + 1) {
if (spec[0] == '-')
num = 0 - num;
if (0 < num)
*ret = begin + num - 2;
else if (!num)
*ret = begin;
else
*ret = begin + num;
return term;
}
return spec;
}
num = strtol(spec, &term, 10);
if (term != spec) {
*ret = num;
return term;
}
if (spec[0] != '/')
return spec;
/* it could be a regexp of form /.../ */
for (term = (char *) spec + 1; *term && *term != '/'; term++) {
if (*term == '\\')
term++;
}
if (*term != '/')
return spec;
/* try [spec+1 .. term-1] as regexp */
*term = 0;
begin--; /* input is in human terms */
line = nth_line(sb, begin);
if (!(reg_error = regcomp(&regexp, spec + 1, REG_NEWLINE)) &&
!(reg_error = regexec(&regexp, line, 1, match, 0))) {
const char *cp = line + match[0].rm_so;
const char *nline;
while (begin++ < lno) {
nline = nth_line(sb, begin);
if (line <= cp && cp < nline)
break;
line = nline;
}
*ret = begin;
regfree(&regexp);
*term++ = '/';
return term;
}
else {
char errbuf[1024];
regerror(reg_error, &regexp, errbuf, 1024);
die("-L parameter '%s': %s", spec + 1, errbuf);
}
}
/*
* Parsing of -L option
*/
static void prepare_blame_range(struct scoreboard *sb,
const char *bottomtop,
long lno,
long *bottom, long *top)
{
const char *term;
term = parse_loc(bottomtop, sb, lno, 1, bottom);
if (*term == ',') {
term = parse_loc(term + 1, sb, lno, *bottom + 1, top);
if (*term)
usage(blame_usage);
}
if (*term)
usage(blame_usage);
}
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.date")) {
if (!value)
return config_error_nonbool(var);
blame_date_mode = parse_date_format(value);
return 0;
}
switch (userdiff_config(var, value)) {
case 0:
break;
case -1:
return -1;
default:
return 0;
}
return git_default_config(var, value, cb);
}
/*
* 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;
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;
if (get_sha1("HEAD", head_sha1))
die("No such ref: HEAD");
time(&now);
commit = xcalloc(1, sizeof(*commit));
commit->parents = xcalloc(1, sizeof(*commit->parents));
commit->parents->item = lookup_commit_reference(head_sha1);
commit->object.parsed = 1;
commit->date = now;
commit->object.type = OBJ_COMMIT;
origin = make_origin(commit, path);
if (!contents_from || strcmp("-", contents_from)) {
struct stat st;
const char *read_from;
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, &buf.buf, &buf_len))
buf.len = buf_len;
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 */
contents_from = "standard input";
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);
commit->util = origin;
/*
* 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(len, 0);
ce->ce_mode = create_ce_mode(mode);
add_cache_entry(ce, ADD_CACHE_OK_TO_ADD|ADD_CACHE_OK_TO_REPLACE);
/*
* We are not going to write this out, so this does not matter
* right now, but someday we might optimize diff-index --cached
* with cache-tree information.
*/
cache_tree_invalidate_path(active_cache_tree, path);
commit->buffer = xmalloc(400);
ident = fmt_ident("Not Committed Yet", "not.committed.yet", NULL, 0);
snprintf(commit->buffer, 400,
"tree 0000000000000000000000000000000000000000\n"
"parent %s\n"
"author %s\n"
"committer %s\n\n"
"Version of %s from %s\n",
sha1_to_hex(head_sha1),
ident, ident, path, contents_from ? contents_from : path);
return commit;
}
static const char *prepare_final(struct scoreboard *sb)
{
int i;
const char *final_commit_name = NULL;
struct rev_info *revs = sb->revs;
/*
* There must be one and only one positive commit in the
* revs->pending array.
*/
for (i = 0; i < revs->pending.nr; i++) {
struct object *obj = revs->pending.objects[i].item;
if (obj->flags & UNINTERESTING)
continue;
while (obj->type == OBJ_TAG)
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 from %s and %s?",
revs->pending.objects[i].name,
final_commit_name);
sb->final = (struct commit *) obj;
final_commit_name = revs->pending.objects[i].name;
}
return final_commit_name;
}
static const 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;
while (obj->type == OBJ_TAG)
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 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;
}
static int blame_bottomtop_callback(const struct option *option, const char *arg, int unset)
{
const char **bottomtop = option->value;
if (!arg)
return -1;
if (*bottomtop)
die("More than one '-L n,m' option given");
*bottomtop = 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;
long dashdash_pos, bottom, top, lno;
const char *final_commit_name = NULL;
enum object_type type;
static const char *bottomtop = NULL;
static int output_option = 0, opt = 0;
static int show_stats = 0;
static const char *revs_file = NULL;
static const char *contents_from = NULL;
static const struct option options[] = {
OPT_BOOLEAN(0, "incremental", &incremental, "Show blame entries as we find them, incrementally"),
OPT_BOOLEAN('b', NULL, &blank_boundary, "Show blank SHA-1 for boundary commits (Default: off)"),
OPT_BOOLEAN(0, "root", &show_root, "Do not treat root commits as boundaries (Default: off)"),
OPT_BOOLEAN(0, "show-stats", &show_stats, "Show work cost statistics"),
OPT_BIT(0, "score-debug", &output_option, "Show output score for blame entries", OUTPUT_SHOW_SCORE),
OPT_BIT('f', "show-name", &output_option, "Show original filename (Default: auto)", OUTPUT_SHOW_NAME),
OPT_BIT('n', "show-number", &output_option, "Show original linenumber (Default: off)", OUTPUT_SHOW_NUMBER),
OPT_BIT('p', "porcelain", &output_option, "Show in a format designed for machine consumption", OUTPUT_PORCELAIN),
OPT_BIT(0, "line-porcelain", &output_option, "Show porcelain format with per-line commit information", OUTPUT_PORCELAIN|OUTPUT_LINE_PORCELAIN),
OPT_BIT('c', NULL, &output_option, "Use the same output mode as git-annotate (Default: off)", OUTPUT_ANNOTATE_COMPAT),
OPT_BIT('t', NULL, &output_option, "Show raw timestamp (Default: off)", OUTPUT_RAW_TIMESTAMP),
OPT_BIT('l', NULL, &output_option, "Show long commit SHA1 (Default: off)", OUTPUT_LONG_OBJECT_NAME),
OPT_BIT('s', NULL, &output_option, "Suppress author name and timestamp (Default: off)", OUTPUT_NO_AUTHOR),
OPT_BIT('e', "show-email", &output_option, "Show author email instead of name (Default: off)", OUTPUT_SHOW_EMAIL),
OPT_BIT('w', NULL, &xdl_opts, "Ignore whitespace differences", XDF_IGNORE_WHITESPACE),
OPT_STRING('S', NULL, &revs_file, "file", "Use revisions from <file> instead of calling git-rev-list"),
OPT_STRING(0, "contents", &contents_from, "file", "Use <file>'s contents as the final image"),
{ OPTION_CALLBACK, 'C', NULL, &opt, "score", "Find line copies within and across files", PARSE_OPT_OPTARG, blame_copy_callback },
{ OPTION_CALLBACK, 'M', NULL, &opt, "score", "Find line movements within and across files", PARSE_OPT_OPTARG, blame_move_callback },
OPT_CALLBACK('L', NULL, &bottomtop, "n,m", "Process only line range n,m, counting from 1", blame_bottomtop_callback),
OPT__ABBREV(&abbrev),
OPT_END()
};
struct parse_opt_ctx_t ctx;
int cmd_is_annotate = !strcmp(argv[0], "annotate");
git_config(git_blame_config, NULL);
init_revisions(&revs, NULL);
revs.date_mode = blame_date_mode;
DIFF_OPT_SET(&revs.diffopt, ALLOW_TEXTCONV);
save_commit_buffer = 0;
dashdash_pos = 0;
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:
argc = parse_options_end(&ctx);
if (abbrev == -1)
abbrev = default_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 = DATE_ISO8601;
} else {
blame_date_mode = revs.date_mode;
}
/* The maximum width used to show the dates */
switch (blame_date_mode) {
case DATE_RFC2822:
blame_date_width = sizeof("Thu, 19 Oct 2006 16:00:04 -0700");
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:
/* "normal" is used as the fallback for "relative" */
case DATE_LOCAL:
case DATE_NORMAL:
blame_date_width = sizeof("Thu Oct 19 16:00:04 2006 -0700");
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 && !has_string_in_work_tree(path)) { /* (2b) */
path = add_prefix(prefix, argv[1]);
argv[1] = argv[2];
}
argv[argc - 1] = "--";
setup_work_tree();
if (!has_string_in_work_tree(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);
else if (contents_from)
die("--contents and --children do not blend well.");
else
final_commit_name = prepare_initial(&sb);
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 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 (is_null_sha1(sb.final->object.sha1)) {
char *buf;
o = sb.final->util;
buf = xmalloc(o->file.size + 1);
memcpy(buf, o->file.ptr, o->file.size + 1);
sb.final_buf = buf;
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, (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);
bottom = top = 0;
if (bottomtop)
prepare_blame_range(&sb, bottomtop, lno, &bottom, &top);
if (bottom && top && top < bottom) {
long tmp;
tmp = top; top = bottom; bottom = tmp;
}
if (bottom < 1)
bottom = 1;
if (top < 1)
top = lno;
bottom--;
if (lno < top || lno < bottom)
die("file %s has only %lu lines", path, lno);
ent = xcalloc(1, sizeof(*ent));
ent->lno = bottom;
ent->num_lines = top - bottom;
ent->suspect = o;
ent->s_lno = bottom;
sb.ent = ent;
sb.path = path;
read_mailmap(&mailmap, NULL);
if (!incremental)
setup_pager();
assign_blame(&sb, opt);
if (incremental)
return 0;
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;
}