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git-commit-vandalism/builtin/rev-list.c
Jeff King 2824e1841b list-objects: pass full pathname to callbacks 
When we find a blob at "a/b/c", we currently pass this to
our show_object_fn callbacks as two components: "a/b/" and
"c". Callbacks which want the full value then call
path_name(), which concatenates the two. But this is an
inefficient interface; the path is a strbuf, and we could
simply append "c" to it temporarily, then roll back the
length, without creating a new copy.

So we could improve this by teaching the callsites of
path_name() this trick (and there are only 3). But we can
also notice that no callback actually cares about the
broken-down representation, and simply pass each callback
the full path "a/b/c" as a string. The callback code becomes
even simpler, then, as we do not have to worry about freeing
an allocated buffer, nor rolling back our modification to
the strbuf.

This is theoretically less efficient, as some callbacks
would not bother to format the final path component. But in
practice this is not measurable. Since we use the same
strbuf over and over, our work to grow it is amortized, and
we really only pay to memcpy a few bytes.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2016-03-16 10:41:04 -07:00

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#include "cache.h"
#include "commit.h"
#include "diff.h"
#include "revision.h"
#include "list-objects.h"
#include "pack.h"
#include "pack-bitmap.h"
#include "builtin.h"
#include "log-tree.h"
#include "graph.h"
#include "bisect.h"
static const char rev_list_usage[] =
"git rev-list [OPTION] <commit-id>... [ -- paths... ]\n"
" limiting output:\n"
" --max-count=<n>\n"
" --max-age=<epoch>\n"
" --min-age=<epoch>\n"
" --sparse\n"
" --no-merges\n"
" --min-parents=<n>\n"
" --no-min-parents\n"
" --max-parents=<n>\n"
" --no-max-parents\n"
" --remove-empty\n"
" --all\n"
" --branches\n"
" --tags\n"
" --remotes\n"
" --stdin\n"
" --quiet\n"
" ordering output:\n"
" --topo-order\n"
" --date-order\n"
" --reverse\n"
" formatting output:\n"
" --parents\n"
" --children\n"
" --objects | --objects-edge\n"
" --unpacked\n"
" --header | --pretty\n"
" --abbrev=<n> | --no-abbrev\n"
" --abbrev-commit\n"
" --left-right\n"
" --count\n"
" special purpose:\n"
" --bisect\n"
" --bisect-vars\n"
" --bisect-all"
;
static void finish_commit(struct commit *commit, void *data);
static void show_commit(struct commit *commit, void *data)
{
struct rev_list_info *info = data;
struct rev_info *revs = info->revs;
if (info->flags & REV_LIST_QUIET) {
finish_commit(commit, data);
return;
}
graph_show_commit(revs->graph);
if (revs->count) {
if (commit->object.flags & PATCHSAME)
revs->count_same++;
else if (commit->object.flags & SYMMETRIC_LEFT)
revs->count_left++;
else
revs->count_right++;
finish_commit(commit, data);
return;
}
if (info->show_timestamp)
printf("%lu ", commit->date);
if (info->header_prefix)
fputs(info->header_prefix, stdout);
if (!revs->graph)
fputs(get_revision_mark(revs, commit), stdout);
if (revs->abbrev_commit && revs->abbrev)
fputs(find_unique_abbrev(commit->object.sha1, revs->abbrev),
stdout);
else
fputs(sha1_to_hex(commit->object.sha1), stdout);
if (revs->print_parents) {
struct commit_list *parents = commit->parents;
while (parents) {
printf(" %s", sha1_to_hex(parents->item->object.sha1));
parents = parents->next;
}
}
if (revs->children.name) {
struct commit_list *children;
children = lookup_decoration(&revs->children, &commit->object);
while (children) {
printf(" %s", sha1_to_hex(children->item->object.sha1));
children = children->next;
}
}
show_decorations(revs, commit);
if (revs->commit_format == CMIT_FMT_ONELINE)
putchar(' ');
else
putchar('\n');
if (revs->verbose_header && get_cached_commit_buffer(commit, NULL)) {
struct strbuf buf = STRBUF_INIT;
struct pretty_print_context ctx = {0};
ctx.abbrev = revs->abbrev;
ctx.date_mode = revs->date_mode;
ctx.date_mode_explicit = revs->date_mode_explicit;
ctx.fmt = revs->commit_format;
ctx.output_encoding = get_log_output_encoding();
pretty_print_commit(&ctx, commit, &buf);
if (revs->graph) {
if (buf.len) {
if (revs->commit_format != CMIT_FMT_ONELINE)
graph_show_oneline(revs->graph);
graph_show_commit_msg(revs->graph, &buf);
/*
* Add a newline after the commit message.
*
* Usually, this newline produces a blank
* padding line between entries, in which case
* we need to add graph padding on this line.
*
* However, the commit message may not end in a
* newline. In this case the newline simply
* ends the last line of the commit message,
* and we don't need any graph output. (This
* always happens with CMIT_FMT_ONELINE, and it
* happens with CMIT_FMT_USERFORMAT when the
* format doesn't explicitly end in a newline.)
*/
if (buf.len && buf.buf[buf.len - 1] == '\n')
graph_show_padding(revs->graph);
putchar('\n');
} else {
/*
* If the message buffer is empty, just show
* the rest of the graph output for this
* commit.
*/
if (graph_show_remainder(revs->graph))
putchar('\n');
if (revs->commit_format == CMIT_FMT_ONELINE)
putchar('\n');
}
} else {
if (revs->commit_format != CMIT_FMT_USERFORMAT ||
buf.len) {
fwrite(buf.buf, 1, buf.len, stdout);
putchar(info->hdr_termination);
}
}
strbuf_release(&buf);
} else {
if (graph_show_remainder(revs->graph))
putchar('\n');
}
maybe_flush_or_die(stdout, "stdout");
finish_commit(commit, data);
}
static void finish_commit(struct commit *commit, void *data)
{
if (commit->parents) {
free_commit_list(commit->parents);
commit->parents = NULL;
}
free_commit_buffer(commit);
}
static void finish_object(struct object *obj, const char *name, void *cb_data)
{
struct rev_list_info *info = cb_data;
if (obj->type == OBJ_BLOB && !has_sha1_file(obj->sha1))
die("missing blob object '%s'", sha1_to_hex(obj->sha1));
if (info->revs->verify_objects && !obj->parsed && obj->type != OBJ_COMMIT)
parse_object(obj->sha1);
}
static void show_object(struct object *obj, const char *name, void *cb_data)
{
struct rev_list_info *info = cb_data;
finish_object(obj, name, cb_data);
if (info->flags & REV_LIST_QUIET)
return;
show_object_with_name(stdout, obj, name);
}
static void show_edge(struct commit *commit)
{
printf("-%s\n", sha1_to_hex(commit->object.sha1));
}
static void print_var_str(const char *var, const char *val)
{
printf("%s='%s'\n", var, val);
}
static void print_var_int(const char *var, int val)
{
printf("%s=%d\n", var, val);
}
static int show_bisect_vars(struct rev_list_info *info, int reaches, int all)
{
int cnt, flags = info->flags;
char hex[41] = "";
struct commit_list *tried;
struct rev_info *revs = info->revs;
if (!revs->commits)
return 1;
revs->commits = filter_skipped(revs->commits, &tried,
flags & BISECT_SHOW_ALL,
NULL, NULL);
/*
* revs->commits can reach "reaches" commits among
* "all" commits. If it is good, then there are
* (all-reaches) commits left to be bisected.
* On the other hand, if it is bad, then the set
* to bisect is "reaches".
* A bisect set of size N has (N-1) commits further
* to test, as we already know one bad one.
*/
cnt = all - reaches;
if (cnt < reaches)
cnt = reaches;
if (revs->commits)
strcpy(hex, sha1_to_hex(revs->commits->item->object.sha1));
if (flags & BISECT_SHOW_ALL) {
traverse_commit_list(revs, show_commit, show_object, info);
printf("------\n");
}
print_var_str("bisect_rev", hex);
print_var_int("bisect_nr", cnt - 1);
print_var_int("bisect_good", all - reaches - 1);
print_var_int("bisect_bad", reaches - 1);
print_var_int("bisect_all", all);
print_var_int("bisect_steps", estimate_bisect_steps(all));
return 0;
}
static int show_object_fast(
const unsigned char *sha1,
enum object_type type,
int exclude,
uint32_t name_hash,
struct packed_git *found_pack,
off_t found_offset)
{
fprintf(stdout, "%s\n", sha1_to_hex(sha1));
return 1;
}
int cmd_rev_list(int argc, const char **argv, const char *prefix)
{
struct rev_info revs;
struct rev_list_info info;
int i;
int bisect_list = 0;
int bisect_show_vars = 0;
int bisect_find_all = 0;
int use_bitmap_index = 0;
git_config(git_default_config, NULL);
init_revisions(&revs, prefix);
revs.abbrev = DEFAULT_ABBREV;
revs.commit_format = CMIT_FMT_UNSPECIFIED;
argc = setup_revisions(argc, argv, &revs, NULL);
memset(&info, 0, sizeof(info));
info.revs = &revs;
if (revs.bisect)
bisect_list = 1;
if (DIFF_OPT_TST(&revs.diffopt, QUICK))
info.flags |= REV_LIST_QUIET;
for (i = 1 ; i < argc; i++) {
const char *arg = argv[i];
if (!strcmp(arg, "--header")) {
revs.verbose_header = 1;
continue;
}
if (!strcmp(arg, "--timestamp")) {
info.show_timestamp = 1;
continue;
}
if (!strcmp(arg, "--bisect")) {
bisect_list = 1;
continue;
}
if (!strcmp(arg, "--bisect-all")) {
bisect_list = 1;
bisect_find_all = 1;
info.flags |= BISECT_SHOW_ALL;
revs.show_decorations = 1;
continue;
}
if (!strcmp(arg, "--bisect-vars")) {
bisect_list = 1;
bisect_show_vars = 1;
continue;
}
if (!strcmp(arg, "--use-bitmap-index")) {
use_bitmap_index = 1;
continue;
}
if (!strcmp(arg, "--test-bitmap")) {
test_bitmap_walk(&revs);
return 0;
}
usage(rev_list_usage);
}
if (revs.commit_format != CMIT_FMT_UNSPECIFIED) {
/* The command line has a --pretty */
info.hdr_termination = '\n';
if (revs.commit_format == CMIT_FMT_ONELINE)
info.header_prefix = "";
else
info.header_prefix = "commit ";
}
else if (revs.verbose_header)
/* Only --header was specified */
revs.commit_format = CMIT_FMT_RAW;
if ((!revs.commits &&
(!(revs.tag_objects || revs.tree_objects || revs.blob_objects) &&
!revs.pending.nr)) ||
revs.diff)
usage(rev_list_usage);
save_commit_buffer = (revs.verbose_header ||
revs.grep_filter.pattern_list ||
revs.grep_filter.header_list);
if (bisect_list)
revs.limited = 1;
if (use_bitmap_index && !revs.prune) {
if (revs.count && !revs.left_right && !revs.cherry_mark) {
uint32_t commit_count;
if (!prepare_bitmap_walk(&revs)) {
count_bitmap_commit_list(&commit_count, NULL, NULL, NULL);
printf("%d\n", commit_count);
return 0;
}
} else if (revs.tag_objects && revs.tree_objects && revs.blob_objects) {
if (!prepare_bitmap_walk(&revs)) {
traverse_bitmap_commit_list(&show_object_fast);
return 0;
}
}
}
if (prepare_revision_walk(&revs))
die("revision walk setup failed");
if (revs.tree_objects)
mark_edges_uninteresting(&revs, show_edge);
if (bisect_list) {
int reaches = reaches, all = all;
revs.commits = find_bisection(revs.commits, &reaches, &all,
bisect_find_all);
if (bisect_show_vars)
return show_bisect_vars(&info, reaches, all);
}
traverse_commit_list(&revs, show_commit, show_object, &info);
if (revs.count) {
if (revs.left_right && revs.cherry_mark)
printf("%d\t%d\t%d\n", revs.count_left, revs.count_right, revs.count_same);
else if (revs.left_right)
printf("%d\t%d\n", revs.count_left, revs.count_right);
else if (revs.cherry_mark)
printf("%d\t%d\n", revs.count_left + revs.count_right, revs.count_same);
else
printf("%d\n", revs.count_left + revs.count_right);
}
return 0;
}
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