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git/builtin/fmt-merge-msg.c

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#include "builtin.h"
#include "cache.h"
#include "config.h"
#include "refs.h"
#include "commit.h"
#include "diff.h"
#include "revision.h"
#include "tag.h"
#include "string-list.h"
#include "branch.h"
#include "fmt-merge-msg.h"
#include "gpg-interface.h"
static const char * const fmt_merge_msg_usage[] = {
N_("git fmt-merge-msg [-m <message>] [--log[=<n>] | --no-log] [--file <file>]"),
NULL
};
static int use_branch_desc;
int fmt_merge_msg_config(const char *key, const char *value, void *cb)
{
if (!strcmp(key, "merge.log") || !strcmp(key, "merge.summary")) {
int is_bool;
merge_log_config = git_config_bool_or_int(key, value, &is_bool);
if (!is_bool && merge_log_config < 0)
return error("%s: negative length %s", key, value);
if (is_bool && merge_log_config)
merge_log_config = DEFAULT_MERGE_LOG_LEN;
} else if (!strcmp(key, "merge.branchdesc")) {
use_branch_desc = git_config_bool(key, value);
} else {
return git_default_config(key, value, cb);
}
return 0;
}
/* merge data per repository where the merged tips came from */
struct src_data {
struct string_list branch, tag, r_branch, generic;
int head_status;
};
struct origin_data {
struct object_id oid;
unsigned is_local_branch:1;
};
static void init_src_data(struct src_data *data)
{
data->branch.strdup_strings = 1;
data->tag.strdup_strings = 1;
data->r_branch.strdup_strings = 1;
data->generic.strdup_strings = 1;
}
static struct string_list srcs = STRING_LIST_INIT_DUP;
static struct string_list origins = STRING_LIST_INIT_DUP;
struct merge_parents {
int alloc, nr;
struct merge_parent {
struct object_id given;
struct object_id commit;
unsigned char used;
} *item;
};
/*
* I know, I know, this is inefficient, but you won't be pulling and merging
* hundreds of heads at a time anyway.
*/
static struct merge_parent *find_merge_parent(struct merge_parents *table,
struct object_id *given,
struct object_id *commit)
{
int i;
for (i = 0; i < table->nr; i++) {
if (given && oidcmp(&table->item[i].given, given))
continue;
if (commit && oidcmp(&table->item[i].commit, commit))
continue;
return &table->item[i];
}
return NULL;
}
static void add_merge_parent(struct merge_parents *table,
struct object_id *given,
struct object_id *commit)
{
if (table->nr && find_merge_parent(table, given, commit))
return;
ALLOC_GROW(table->item, table->nr + 1, table->alloc);
oidcpy(&table->item[table->nr].given, given);
oidcpy(&table->item[table->nr].commit, commit);
table->item[table->nr].used = 0;
table->nr++;
}
static int handle_line(char *line, struct merge_parents *merge_parents)
{
int i, len = strlen(line);
struct origin_data *origin_data;
char *src;
const char *origin;
struct src_data *src_data;
struct string_list_item *item;
int pulling_head = 0;
struct object_id oid;
if (len < GIT_SHA1_HEXSZ + 3 || line[GIT_SHA1_HEXSZ] != '\t')
return 1;
if (starts_with(line + GIT_SHA1_HEXSZ + 1, "not-for-merge"))
return 0;
if (line[GIT_SHA1_HEXSZ + 1] != '\t')
return 2;
i = get_oid_hex(line, &oid);
if (i)
return 3;
if (!find_merge_parent(merge_parents, &oid, NULL))
return 0; /* subsumed by other parents */
origin_data = xcalloc(1, sizeof(struct origin_data));
oidcpy(&origin_data->oid, &oid);
if (line[len - 1] == '\n')
line[len - 1] = 0;
line += GIT_SHA1_HEXSZ + 2;
/*
* At this point, line points at the beginning of comment e.g.
* "branch 'frotz' of git://that/repository.git".
* Find the repository name and point it with src.
*/
src = strstr(line, " of ");
if (src) {
*src = 0;
src += 4;
pulling_head = 0;
} else {
src = line;
pulling_head = 1;
}
item = unsorted_string_list_lookup(&srcs, src);
if (!item) {
item = string_list_append(&srcs, src);
item->util = xcalloc(1, sizeof(struct src_data));
init_src_data(item->util);
}
src_data = item->util;
if (pulling_head) {
origin = src;
src_data->head_status |= 1;
} else if (starts_with(line, "branch ")) {
origin_data->is_local_branch = 1;
origin = line + 7;
string_list_append(&src_data->branch, origin);
src_data->head_status |= 2;
} else if (starts_with(line, "tag ")) {
origin = line;
string_list_append(&src_data->tag, origin + 4);
src_data->head_status |= 2;
} else if (skip_prefix(line, "remote-tracking branch ", &origin)) {
string_list_append(&src_data->r_branch, origin);
src_data->head_status |= 2;
} else {
origin = src;
string_list_append(&src_data->generic, line);
src_data->head_status |= 2;
}
if (!strcmp(".", src) || !strcmp(src, origin)) {
int len = strlen(origin);
if (origin[0] == '\'' && origin[len - 1] == '\'')
origin = xmemdupz(origin + 1, len - 2);
} else
origin = xstrfmt("%s of %s", origin, src);
if (strcmp(".", src))
origin_data->is_local_branch = 0;
string_list_append(&origins, origin)->util = origin_data;
return 0;
}
static void print_joined(const char *singular, const char *plural,
struct string_list *list, struct strbuf *out)
{
if (list->nr == 0)
return;
if (list->nr == 1) {
strbuf_addf(out, "%s%s", singular, list->items[0].string);
} else {
int i;
strbuf_addstr(out, plural);
for (i = 0; i < list->nr - 1; i++)
strbuf_addf(out, "%s%s", i > 0 ? ", " : "",
list->items[i].string);
strbuf_addf(out, " and %s", list->items[list->nr - 1].string);
}
}
static void add_branch_desc(struct strbuf *out, const char *name)
{
struct strbuf desc = STRBUF_INIT;
if (!read_branch_desc(&desc, name)) {
const char *bp = desc.buf;
while (*bp) {
const char *ep = strchrnul(bp, '\n');
if (*ep)
ep++;
strbuf_addf(out, " : %.*s", (int)(ep - bp), bp);
bp = ep;
}
strbuf_complete_line(out);
}
strbuf_release(&desc);
}
#define util_as_integral(elem) ((intptr_t)((elem)->util))
static void record_person_from_buf(int which, struct string_list *people,
const char *buffer)
{
char *name_buf, *name, *name_end;
struct string_list_item *elem;
const char *field;
field = (which == 'a') ? "\nauthor " : "\ncommitter ";
name = strstr(buffer, field);
if (!name)
return;
name += strlen(field);
name_end = strchrnul(name, '<');
if (*name_end)
name_end--;
while (isspace(*name_end) && name <= name_end)
name_end--;
if (name_end < name)
return;
name_buf = xmemdupz(name, name_end - name + 1);
elem = string_list_lookup(people, name_buf);
if (!elem) {
elem = string_list_insert(people, name_buf);
elem->util = (void *)0;
}
elem->util = (void*)(util_as_integral(elem) + 1);
free(name_buf);
}
static void record_person(int which, struct string_list *people,
struct commit *commit)
{
const char *buffer = get_commit_buffer(commit, NULL);
record_person_from_buf(which, people, buffer);
unuse_commit_buffer(commit, buffer);
}
static int cmp_string_list_util_as_integral(const void *a_, const void *b_)
{
const struct string_list_item *a = a_, *b = b_;
return util_as_integral(b) - util_as_integral(a);
}
static void add_people_count(struct strbuf *out, struct string_list *people)
{
if (people->nr == 1)
strbuf_addstr(out, people->items[0].string);
else if (people->nr == 2)
strbuf_addf(out, "%s (%d) and %s (%d)",
people->items[0].string,
(int)util_as_integral(&people->items[0]),
people->items[1].string,
(int)util_as_integral(&people->items[1]));
else if (people->nr)
strbuf_addf(out, "%s (%d) and others",
people->items[0].string,
(int)util_as_integral(&people->items[0]));
}
static void credit_people(struct strbuf *out,
struct string_list *them,
int kind)
{
const char *label;
const char *me;
if (kind == 'a') {
label = "By";
me = git_author_info(IDENT_NO_DATE);
} else {
label = "Via";
me = git_committer_info(IDENT_NO_DATE);
}
if (!them->nr ||
(them->nr == 1 &&
me &&
skip_prefix(me, them->items->string, &me) &&
starts_with(me, " <")))
return;
strbuf_addf(out, "\n%c %s ", comment_line_char, label);
add_people_count(out, them);
}
static void add_people_info(struct strbuf *out,
struct string_list *authors,
struct string_list *committers)
{
QSORT(authors->items, authors->nr,
cmp_string_list_util_as_integral);
QSORT(committers->items, committers->nr,
cmp_string_list_util_as_integral);
credit_people(out, authors, 'a');
credit_people(out, committers, 'c');
}
static void shortlog(const char *name,
struct origin_data *origin_data,
struct commit *head,
struct rev_info *rev,
struct fmt_merge_msg_opts *opts,
struct strbuf *out)
{
int i, count = 0;
struct commit *commit;
struct object *branch;
struct string_list subjects = STRING_LIST_INIT_DUP;
struct string_list authors = STRING_LIST_INIT_DUP;
struct string_list committers = STRING_LIST_INIT_DUP;
int flags = UNINTERESTING | TREESAME | SEEN | SHOWN | ADDED;
struct strbuf sb = STRBUF_INIT;
const struct object_id *oid = &origin_data->oid;
int limit = opts->shortlog_len;
branch = deref_tag(parse_object(oid), oid_to_hex(oid), GIT_SHA1_HEXSZ);
if (!branch || branch->type != OBJ_COMMIT)
return;
setup_revisions(0, NULL, rev, NULL);
add_pending_object(rev, branch, name);
add_pending_object(rev, &head->object, "^HEAD");
head->object.flags |= UNINTERESTING;
if (prepare_revision_walk(rev))
die("revision walk setup failed");
while ((commit = get_revision(rev)) != NULL) {
struct pretty_print_context ctx = {0};
if (commit->parents && commit->parents->next) {
/* do not list a merge but count committer */
if (opts->credit_people)
record_person('c', &committers, commit);
continue;
}
if (!count && opts->credit_people)
/* the 'tip' committer */
record_person('c', &committers, commit);
if (opts->credit_people)
record_person('a', &authors, commit);
count++;
if (subjects.nr > limit)
continue;
format_commit_message(commit, "%s", &sb, &ctx);
strbuf_ltrim(&sb);
if (!sb.len)
string_list_append(&subjects,
oid_to_hex(&commit->object.oid));
else
string_list_append(&subjects, strbuf_detach(&sb, NULL));
}
if (opts->credit_people)
add_people_info(out, &authors, &committers);
if (count > limit)
strbuf_addf(out, "\n* %s: (%d commits)\n", name, count);
else
strbuf_addf(out, "\n* %s:\n", name);
if (origin_data->is_local_branch && use_branch_desc)
add_branch_desc(out, name);
for (i = 0; i < subjects.nr; i++)
if (i >= limit)
strbuf_addstr(out, " ...\n");
else
strbuf_addf(out, " %s\n", subjects.items[i].string);
clear_commit_marks((struct commit *)branch, flags);
clear_commit_marks(head, flags);
free_commit_list(rev->commits);
rev->commits = NULL;
rev->pending.nr = 0;
string_list_clear(&authors, 0);
string_list_clear(&committers, 0);
string_list_clear(&subjects, 0);
}
static void fmt_merge_msg_title(struct strbuf *out,
const char *current_branch)
{
int i = 0;
char *sep = "";
strbuf_addstr(out, "Merge ");
for (i = 0; i < srcs.nr; i++) {
struct src_data *src_data = srcs.items[i].util;
const char *subsep = "";
strbuf_addstr(out, sep);
sep = "; ";
if (src_data->head_status == 1) {
strbuf_addstr(out, srcs.items[i].string);
continue;
}
if (src_data->head_status == 3) {
subsep = ", ";
strbuf_addstr(out, "HEAD");
}
if (src_data->branch.nr) {
strbuf_addstr(out, subsep);
subsep = ", ";
print_joined("branch ", "branches ", &src_data->branch,
out);
}
if (src_data->r_branch.nr) {
strbuf_addstr(out, subsep);
subsep = ", ";
print_joined("remote-tracking branch ", "remote-tracking branches ",
&src_data->r_branch, out);
}
if (src_data->tag.nr) {
strbuf_addstr(out, subsep);
subsep = ", ";
print_joined("tag ", "tags ", &src_data->tag, out);
}
if (src_data->generic.nr) {
strbuf_addstr(out, subsep);
print_joined("commit ", "commits ", &src_data->generic,
out);
}
if (strcmp(".", srcs.items[i].string))
strbuf_addf(out, " of %s", srcs.items[i].string);
}
if (!strcmp("master", current_branch))
strbuf_addch(out, '\n');
else
strbuf_addf(out, " into %s\n", current_branch);
}
static void fmt_tag_signature(struct strbuf *tagbuf,
struct strbuf *sig,
const char *buf,
unsigned long len)
{
const char *tag_body = strstr(buf, "\n\n");
if (tag_body) {
tag_body += 2;
strbuf_add(tagbuf, tag_body, buf + len - tag_body);
}
strbuf_complete_line(tagbuf);
if (sig->len) {
strbuf_addch(tagbuf, '\n');
strbuf_add_commented_lines(tagbuf, sig->buf, sig->len);
}
}
static void fmt_merge_msg_sigs(struct strbuf *out)
{
int i, tag_number = 0, first_tag = 0;
struct strbuf tagbuf = STRBUF_INIT;
for (i = 0; i < origins.nr; i++) {
unsigned char *sha1 = origins.items[i].util;
enum object_type type;
unsigned long size, len;
char *buf = read_sha1_file(sha1, &type, &size);
struct strbuf sig = STRBUF_INIT;
if (!buf || type != OBJ_TAG)
goto next;
len = parse_signature(buf, size);
if (size == len)
; /* merely annotated */
else if (verify_signed_buffer(buf, len, buf + len, size - len, &sig, NULL)) {
if (!sig.len)
strbuf_addstr(&sig, "gpg verification failed.\n");
}
if (!tag_number++) {
fmt_tag_signature(&tagbuf, &sig, buf, len);
first_tag = i;
} else {
if (tag_number == 2) {
struct strbuf tagline = STRBUF_INIT;
strbuf_addch(&tagline, '\n');
strbuf_add_commented_lines(&tagline,
origins.items[first_tag].string,
strlen(origins.items[first_tag].string));
strbuf_insert(&tagbuf, 0, tagline.buf,
tagline.len);
strbuf_release(&tagline);
}
strbuf_addch(&tagbuf, '\n');
strbuf_add_commented_lines(&tagbuf,
origins.items[i].string,
strlen(origins.items[i].string));
fmt_tag_signature(&tagbuf, &sig, buf, len);
}
strbuf_release(&sig);
next:
free(buf);
}
if (tagbuf.len) {
strbuf_addch(out, '\n');
strbuf_addbuf(out, &tagbuf);
}
strbuf_release(&tagbuf);
}
static void find_merge_parents(struct merge_parents *result,
struct strbuf *in, struct object_id *head)
{
struct commit_list *parents;
struct commit *head_commit;
int pos = 0, i, j;
parents = NULL;
while (pos < in->len) {
int len;
char *p = in->buf + pos;
char *newline = strchr(p, '\n');
struct object_id oid;
struct commit *parent;
struct object *obj;
len = newline ? newline - p : strlen(p);
pos += len + !!newline;
if (len < GIT_SHA1_HEXSZ + 3 ||
get_oid_hex(p, &oid) ||
p[GIT_SHA1_HEXSZ] != '\t' ||
p[GIT_SHA1_HEXSZ + 1] != '\t')
continue; /* skip not-for-merge */
/*
* Do not use get_merge_parent() here; we do not have
* "name" here and we do not want to contaminate its
* util field yet.
*/
obj = parse_object(&oid);
parent = (struct commit *)peel_to_type(NULL, 0, obj, OBJ_COMMIT);
if (!parent)
continue;
commit_list_insert(parent, &parents);
add_merge_parent(result, &obj->oid, &parent->object.oid);
}
head_commit = lookup_commit(head);
if (head_commit)
commit_list_insert(head_commit, &parents);
parents = reduce_heads(parents);
while (parents) {
struct commit *cmit = pop_commit(&parents);
for (i = 0; i < result->nr; i++)
if (!oidcmp(&result->item[i].commit, &cmit->object.oid))
result->item[i].used = 1;
}
for (i = j = 0; i < result->nr; i++) {
if (result->item[i].used) {
if (i != j)
result->item[j] = result->item[i];
j++;
}
}
result->nr = j;
}
int fmt_merge_msg(struct strbuf *in, struct strbuf *out,
struct fmt_merge_msg_opts *opts)
{
int i = 0, pos = 0;
struct object_id head_oid;
const char *current_branch;
void *current_branch_to_free;
struct merge_parents merge_parents;
memset(&merge_parents, 0, sizeof(merge_parents));
/* get current branch */
current_branch = current_branch_to_free =
resolve_refdup("HEAD", RESOLVE_REF_READING, head_oid.hash, NULL);
if (!current_branch)
die("No current branch");
if (starts_with(current_branch, "refs/heads/"))
current_branch += 11;
find_merge_parents(&merge_parents, in, &head_oid);
/* get a line */
while (pos < in->len) {
int len;
char *newline, *p = in->buf + pos;
newline = strchr(p, '\n');
len = newline ? newline - p : strlen(p);
pos += len + !!newline;
i++;
p[len] = 0;
if (handle_line(p, &merge_parents))
die ("Error in line %d: %.*s", i, len, p);
}
if (opts->add_title && srcs.nr)
fmt_merge_msg_title(out, current_branch);
if (origins.nr)
fmt_merge_msg_sigs(out);
if (opts->shortlog_len) {
struct commit *head;
struct rev_info rev;
head = lookup_commit_or_die(&head_oid, "HEAD");
init_revisions(&rev, NULL);
rev.commit_format = CMIT_FMT_ONELINE;
rev.ignore_merges = 1;
rev.limited = 1;
strbuf_complete_line(out);
for (i = 0; i < origins.nr; i++)
shortlog(origins.items[i].string,
origins.items[i].util,
head, &rev, opts, out);
}
strbuf_complete_line(out);
free(current_branch_to_free);
free(merge_parents.item);
return 0;
}
int cmd_fmt_merge_msg(int argc, const char **argv, const char *prefix)
{
const char *inpath = NULL;
const char *message = NULL;
int shortlog_len = -1;
struct option options[] = {
{ OPTION_INTEGER, 0, "log", &shortlog_len, N_("n"),
N_("populate log with at most <n> entries from shortlog"),
PARSE_OPT_OPTARG, NULL, DEFAULT_MERGE_LOG_LEN },
{ OPTION_INTEGER, 0, "summary", &shortlog_len, N_("n"),
N_("alias for --log (deprecated)"),
PARSE_OPT_OPTARG | PARSE_OPT_HIDDEN, NULL,
DEFAULT_MERGE_LOG_LEN },
OPT_STRING('m', "message", &message, N_("text"),
N_("use <text> as start of message")),
OPT_FILENAME('F', "file", &inpath, N_("file to read from")),
OPT_END()
};
FILE *in = stdin;
struct strbuf input = STRBUF_INIT, output = STRBUF_INIT;
int ret;
struct fmt_merge_msg_opts opts;
git_config(fmt_merge_msg_config, NULL);
argc = parse_options(argc, argv, prefix, options, fmt_merge_msg_usage,
0);
if (argc > 0)
usage_with_options(fmt_merge_msg_usage, options);
if (shortlog_len < 0)
shortlog_len = (merge_log_config > 0) ? merge_log_config : 0;
if (inpath && strcmp(inpath, "-")) {
in = fopen(inpath, "r");
if (!in)
die_errno("cannot open '%s'", inpath);
}
if (strbuf_read(&input, fileno(in), 0) < 0)
die_errno("could not read input file");
if (message)
strbuf_addstr(&output, message);
memset(&opts, 0, sizeof(opts));
opts.add_title = !message;
opts.credit_people = 1;
opts.shortlog_len = shortlog_len;
ret = fmt_merge_msg(&input, &output, &opts);
if (ret)
return ret;
write_in_full(STDOUT_FILENO, output.buf, output.len);
return 0;
}
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