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478 lines (396 loc) · 12.9 KB
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/*
* Copyright (C) the libgit2 contributors. All rights reserved.
*
* This file is part of libgit2, distributed under the GNU GPL v2 with
* a Linking Exception. For full terms see the included COPYING file.
*/
#include "blame.h"
#include "git2/commit.h"
#include "git2/revparse.h"
#include "git2/revwalk.h"
#include "git2/tree.h"
#include "git2/diff.h"
#include "git2/blob.h"
#include "git2/signature.h"
#include "util.h"
#include "repository.h"
#include "blame_git.h"
static int hunk_byfinalline_search_cmp(const void *key, const void *entry)
{
uint16_t lineno = (uint16_t)*(size_t*)key;
git_blame_hunk *hunk = (git_blame_hunk*)entry;
if (lineno < hunk->final_start_line_number)
return -1;
if (lineno >= hunk->final_start_line_number + hunk->lines_in_hunk)
return 1;
return 0;
}
static int paths_cmp(const void *a, const void *b) { return git__strcmp((char*)a, (char*)b); }
static int hunk_cmp(const void *_a, const void *_b)
{
git_blame_hunk *a = (git_blame_hunk*)_a,
*b = (git_blame_hunk*)_b;
return a->final_start_line_number - b->final_start_line_number;
}
static bool hunk_ends_at_or_before_line(git_blame_hunk *hunk, size_t line)
{
return line >= (size_t)(hunk->final_start_line_number + hunk->lines_in_hunk - 1);
}
static bool hunk_starts_at_or_after_line(git_blame_hunk *hunk, size_t line)
{
return line <= hunk->final_start_line_number;
}
static git_blame_hunk* new_hunk(
uint16_t start,
uint16_t lines,
uint16_t orig_start,
const char *path)
{
git_blame_hunk *hunk = git__calloc(1, sizeof(git_blame_hunk));
if (!hunk) return NULL;
hunk->lines_in_hunk = lines;
hunk->final_start_line_number = start;
hunk->orig_start_line_number = orig_start;
hunk->orig_path = path ? git__strdup(path) : NULL;
return hunk;
}
static git_blame_hunk* dup_hunk(git_blame_hunk *hunk)
{
git_blame_hunk *newhunk = new_hunk(
hunk->final_start_line_number,
hunk->lines_in_hunk,
hunk->orig_start_line_number,
hunk->orig_path);
git_oid_cpy(&newhunk->orig_commit_id, &hunk->orig_commit_id);
git_oid_cpy(&newhunk->final_commit_id, &hunk->final_commit_id);
newhunk->boundary = hunk->boundary;
git_signature_dup(&newhunk->final_signature, hunk->final_signature);
git_signature_dup(&newhunk->orig_signature, hunk->orig_signature);
return newhunk;
}
static void free_hunk(git_blame_hunk *hunk)
{
git__free((void*)hunk->orig_path);
git_signature_free(hunk->final_signature);
git_signature_free(hunk->orig_signature);
git__free(hunk);
}
/* Starting with the hunk that includes start_line, shift all following hunks'
* final_start_line by shift_by lines */
static void shift_hunks_by(git_vector *v, size_t start_line, int shift_by)
{
size_t i;
if (!git_vector_bsearch2( &i, v, hunk_byfinalline_search_cmp, &start_line)) {
for (; i < v->length; i++) {
git_blame_hunk *hunk = (git_blame_hunk*)v->contents[i];
hunk->final_start_line_number += shift_by;
}
}
}
git_blame* git_blame__alloc(
git_repository *repo,
git_blame_options opts,
const char *path)
{
git_blame *gbr = git__calloc(1, sizeof(git_blame));
if (!gbr)
return NULL;
gbr->repository = repo;
gbr->options = opts;
if (git_vector_init(&gbr->hunks, 8, hunk_cmp) < 0 ||
git_vector_init(&gbr->paths, 8, paths_cmp) < 0 ||
(gbr->path = git__strdup(path)) == NULL ||
git_vector_insert(&gbr->paths, git__strdup(path)) < 0)
{
git_blame_free(gbr);
return NULL;
}
return gbr;
}
void git_blame_free(git_blame *blame)
{
size_t i;
git_blame_hunk *hunk;
if (!blame) return;
git_vector_foreach(&blame->hunks, i, hunk)
free_hunk(hunk);
git_vector_free(&blame->hunks);
git_vector_free_deep(&blame->paths);
git_array_clear(blame->line_index);
git__free(blame->path);
git_blob_free(blame->final_blob);
git__free(blame);
}
uint32_t git_blame_get_hunk_count(git_blame *blame)
{
assert(blame);
return (uint32_t)blame->hunks.length;
}
const git_blame_hunk *git_blame_get_hunk_byindex(git_blame *blame, uint32_t index)
{
assert(blame);
return (git_blame_hunk*)git_vector_get(&blame->hunks, index);
}
const git_blame_hunk *git_blame_get_hunk_byline(git_blame *blame, uint32_t lineno)
{
size_t i;
assert(blame);
if (!git_vector_bsearch2( &i, &blame->hunks, hunk_byfinalline_search_cmp, &lineno)) {
return git_blame_get_hunk_byindex(blame, (uint32_t)i);
}
return NULL;
}
static void normalize_options(
git_blame_options *out,
const git_blame_options *in,
git_repository *repo)
{
git_blame_options dummy = GIT_BLAME_OPTIONS_INIT;
if (!in) in = &dummy;
memcpy(out, in, sizeof(git_blame_options));
/* No newest_commit => HEAD */
if (git_oid_iszero(&out->newest_commit)) {
git_reference_name_to_id(&out->newest_commit, repo, "HEAD");
}
/* min_line 0 really means 1 */
if (!out->min_line) out->min_line = 1;
/* max_line 0 really means N, but we don't know N yet */
/* Fix up option implications */
if (out->flags & GIT_BLAME_TRACK_COPIES_ANY_COMMIT_COPIES)
out->flags |= GIT_BLAME_TRACK_COPIES_SAME_COMMIT_COPIES;
if (out->flags & GIT_BLAME_TRACK_COPIES_SAME_COMMIT_COPIES)
out->flags |= GIT_BLAME_TRACK_COPIES_SAME_COMMIT_MOVES;
if (out->flags & GIT_BLAME_TRACK_COPIES_SAME_COMMIT_MOVES)
out->flags |= GIT_BLAME_TRACK_COPIES_SAME_FILE;
}
static git_blame_hunk *split_hunk_in_vector(
git_vector *vec,
git_blame_hunk *hunk,
size_t rel_line,
bool return_new)
{
size_t new_line_count;
git_blame_hunk *nh;
/* Don't split if already at a boundary */
if (rel_line <= 0 ||
rel_line >= hunk->lines_in_hunk)
{
return hunk;
}
new_line_count = hunk->lines_in_hunk - rel_line;
nh = new_hunk((uint16_t)(hunk->final_start_line_number+rel_line), (uint16_t)new_line_count,
(uint16_t)(hunk->orig_start_line_number+rel_line), hunk->orig_path);
git_oid_cpy(&nh->final_commit_id, &hunk->final_commit_id);
git_oid_cpy(&nh->orig_commit_id, &hunk->orig_commit_id);
/* Adjust hunk that was split */
hunk->lines_in_hunk -= (uint16_t)new_line_count;
git_vector_insert_sorted(vec, nh, NULL);
{
git_blame_hunk *ret = return_new ? nh : hunk;
return ret;
}
}
/*
* Construct a list of char indices for where lines begin
* Adapted from core git:
* https://github.com/gitster/git/blob/be5c9fb9049ed470e7005f159bb923a5f4de1309/builtin/blame.c#L1760-L1789
*/
static int index_blob_lines(git_blame *blame)
{
const char *buf = blame->final_buf;
git_off_t len = blame->final_buf_size;
int num = 0, incomplete = 0, bol = 1;
size_t *i;
if (len && buf[len-1] != '\n')
incomplete++; /* incomplete line at the end */
while (len--) {
if (bol) {
i = git_array_alloc(blame->line_index);
GITERR_CHECK_ALLOC(i);
*i = buf - blame->final_buf;
bol = 0;
}
if (*buf++ == '\n') {
num++;
bol = 1;
}
}
i = git_array_alloc(blame->line_index);
GITERR_CHECK_ALLOC(i);
*i = buf - blame->final_buf;
blame->num_lines = num + incomplete;
return blame->num_lines;
}
static git_blame_hunk* hunk_from_entry(git_blame__entry *e)
{
git_blame_hunk *h = new_hunk(
e->lno+1, e->num_lines, e->s_lno+1, e->suspect->path);
git_oid_cpy(&h->final_commit_id, git_commit_id(e->suspect->commit));
git_oid_cpy(&h->orig_commit_id, git_commit_id(e->suspect->commit));
git_signature_dup(&h->final_signature, git_commit_author(e->suspect->commit));
git_signature_dup(&h->orig_signature, git_commit_author(e->suspect->commit));
h->boundary = e->is_boundary ? 1 : 0;
return h;
}
static int load_blob(git_blame *blame)
{
int error;
if (blame->final_blob) return 0;
error = git_commit_lookup(&blame->final, blame->repository, &blame->options.newest_commit);
if (error < 0)
goto cleanup;
error = git_object_lookup_bypath((git_object**)&blame->final_blob,
(git_object*)blame->final, blame->path, GIT_OBJ_BLOB);
cleanup:
return error;
}
static int blame_internal(git_blame *blame)
{
int error;
git_blame__entry *ent = NULL;
git_blame__origin *o;
if ((error = load_blob(blame)) < 0 ||
(error = git_blame__get_origin(&o, blame, blame->final, blame->path)) < 0)
goto cleanup;
blame->final_buf = git_blob_rawcontent(blame->final_blob);
blame->final_buf_size = git_blob_rawsize(blame->final_blob);
ent = git__calloc(1, sizeof(git_blame__entry));
ent->num_lines = index_blob_lines(blame);
ent->lno = blame->options.min_line - 1;
ent->num_lines = ent->num_lines - blame->options.min_line + 1;
if (blame->options.max_line > 0)
ent->num_lines = blame->options.max_line - blame->options.min_line + 1;
ent->s_lno = ent->lno;
ent->suspect = o;
blame->ent = ent;
blame->path = blame->path;
git_blame__like_git(blame, blame->options.flags);
cleanup:
for (ent = blame->ent; ent; ) {
git_blame__entry *e = ent->next;
git_vector_insert(&blame->hunks, hunk_from_entry(ent));
git_blame__free_entry(ent);
ent = e;
}
return error;
}
/*******************************************************************************
* File blaming
******************************************************************************/
int git_blame_file(
git_blame **out,
git_repository *repo,
const char *path,
git_blame_options *options)
{
int error = -1;
git_blame_options normOptions = GIT_BLAME_OPTIONS_INIT;
git_blame *blame = NULL;
assert(out && repo && path);
normalize_options(&normOptions, options, repo);
blame = git_blame__alloc(repo, normOptions, path);
GITERR_CHECK_ALLOC(blame);
if ((error = load_blob(blame)) < 0)
goto on_error;
if ((error = blame_internal(blame)) < 0)
goto on_error;
*out = blame;
return 0;
on_error:
git_blame_free(blame);
return error;
}
/*******************************************************************************
* Buffer blaming
*******************************************************************************/
static bool hunk_is_bufferblame(git_blame_hunk *hunk)
{
return git_oid_iszero(&hunk->final_commit_id);
}
static int buffer_hunk_cb(
const git_diff_delta *delta,
const git_diff_hunk *hunk,
void *payload)
{
git_blame *blame = (git_blame*)payload;
uint32_t wedge_line;
GIT_UNUSED(delta);
wedge_line = (hunk->old_lines == 0) ? hunk->new_start : hunk->old_start;
blame->current_diff_line = wedge_line;
blame->current_hunk = (git_blame_hunk*)git_blame_get_hunk_byline(blame, wedge_line);
if (!blame->current_hunk) {
/* Line added at the end of the file */
blame->current_hunk = new_hunk(wedge_line, 0, wedge_line, blame->path);
git_vector_insert(&blame->hunks, blame->current_hunk);
} else if (!hunk_starts_at_or_after_line(blame->current_hunk, wedge_line)){
/* If this hunk doesn't start between existing hunks, split a hunk up so it does */
blame->current_hunk = split_hunk_in_vector(&blame->hunks, blame->current_hunk,
wedge_line - blame->current_hunk->orig_start_line_number, true);
}
return 0;
}
static int ptrs_equal_cmp(const void *a, const void *b) { return a<b ? -1 : a>b ? 1 : 0; }
static int buffer_line_cb(
const git_diff_delta *delta,
const git_diff_hunk *hunk,
const git_diff_line *line,
void *payload)
{
git_blame *blame = (git_blame*)payload;
GIT_UNUSED(delta);
GIT_UNUSED(hunk);
GIT_UNUSED(line);
if (line->origin == GIT_DIFF_LINE_ADDITION) {
if (hunk_is_bufferblame(blame->current_hunk) &&
hunk_ends_at_or_before_line(blame->current_hunk, blame->current_diff_line)) {
/* Append to the current buffer-blame hunk */
blame->current_hunk->lines_in_hunk++;
shift_hunks_by(&blame->hunks, blame->current_diff_line+1, 1);
} else {
/* Create a new buffer-blame hunk with this line */
shift_hunks_by(&blame->hunks, blame->current_diff_line, 1);
blame->current_hunk = new_hunk((uint16_t)blame->current_diff_line, 1, 0, blame->path);
git_vector_insert_sorted(&blame->hunks, blame->current_hunk, NULL);
}
blame->current_diff_line++;
}
if (line->origin == GIT_DIFF_LINE_DELETION) {
/* Trim the line from the current hunk; remove it if it's now empty */
size_t shift_base = blame->current_diff_line + blame->current_hunk->lines_in_hunk+1;
if (--(blame->current_hunk->lines_in_hunk) == 0) {
size_t i;
shift_base--;
if (!git_vector_search2(&i, &blame->hunks, ptrs_equal_cmp, blame->current_hunk)) {
git_vector_remove(&blame->hunks, i);
free_hunk(blame->current_hunk);
blame->current_hunk = (git_blame_hunk*)git_blame_get_hunk_byindex(blame, (uint32_t)i);
}
}
shift_hunks_by(&blame->hunks, shift_base, -1);
}
return 0;
}
int git_blame_buffer(
git_blame **out,
git_blame *reference,
const char *buffer,
size_t buffer_len)
{
git_blame *blame;
git_diff_options diffopts = GIT_DIFF_OPTIONS_INIT;
size_t i;
git_blame_hunk *hunk;
diffopts.context_lines = 0;
assert(out && reference && buffer && buffer_len);
blame = git_blame__alloc(reference->repository, reference->options, reference->path);
/* Duplicate all of the hunk structures in the reference blame */
git_vector_foreach(&reference->hunks, i, hunk) {
git_vector_insert(&blame->hunks, dup_hunk(hunk));
}
/* Diff to the reference blob */
git_diff_blob_to_buffer(reference->final_blob, blame->path,
buffer, buffer_len, blame->path,
&diffopts, NULL, buffer_hunk_cb, buffer_line_cb, blame);
*out = blame;
return 0;
}
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