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git/builtin/blame.c
SZEDER Gábor fa83cc834d parse-options: add support for parsing subcommands 
Several Git commands have subcommands to implement mutually exclusive
"operation modes", and they usually parse their subcommand argument
with a bunch of if-else if statements.

Teach parse-options to handle subcommands as well, which will result
in shorter and simpler code with consistent error handling and error
messages on unknown or missing subcommand, and it will also make
possible for our Bash completion script to handle subcommands
programmatically.

The approach is guided by the following observations:

  - Most subcommands [1] are implemented in dedicated functions, and
    most of those functions [2] either have a signature matching the
    'int cmd_foo(int argc, const char **argc, const char *prefix)'
    signature of builtin commands or can be trivially converted to
    that signature, because they miss only that last prefix parameter
    or have no parameters at all.

  - Subcommand arguments only have long form, and they have no double
    dash prefix, no negated form, and no description, and they don't
    take any arguments, and can't be abbreviated.

  - There must be exactly one subcommand among the arguments, or zero
    if the command has a default operation mode.

  - All arguments following the subcommand are considered to be
    arguments of the subcommand, and, conversely, arguments meant for
    the subcommand may not preceed the subcommand.

So in the end subcommand declaration and parsing would look something
like this:

    parse_opt_subcommand_fn *fn = NULL;
    struct option builtin_commit_graph_options[] = {
        OPT_STRING(0, "object-dir", &opts.obj_dir, N_("dir"),
                   N_("the object directory to store the graph")),
        OPT_SUBCOMMAND("verify", &fn, graph_verify),
        OPT_SUBCOMMAND("write", &fn, graph_write),
        OPT_END(),
    };
    argc = parse_options(argc, argv, prefix, options,
                         builtin_commit_graph_usage, 0);
    return fn(argc, argv, prefix);

Here each OPT_SUBCOMMAND specifies the name of the subcommand and the
function implementing it, and the address of the same 'fn' subcommand
function pointer.  parse_options() then processes the arguments until
it finds the first argument matching one of the subcommands, sets 'fn'
to the function associated with that subcommand, and returns, leaving
the rest of the arguments unprocessed.  If none of the listed
subcommands is found among the arguments, parse_options() will show
usage and abort.

If a command has a default operation mode, 'fn' should be initialized
to the function implementing that mode, and parse_options() should be
invoked with the PARSE_OPT_SUBCOMMAND_OPTIONAL flag.  In this case
parse_options() won't error out when not finding any subcommands, but
will return leaving 'fn' unchanged.  Note that if that default
operation mode has any --options, then the PARSE_OPT_KEEP_UNKNOWN_OPT
flag is necessary as well (otherwise parse_options() would error out
upon seeing the unknown option meant to the default operation mode).

Some thoughts about the implementation:

  - The same pointer to 'fn' must be specified as 'value' for each
    OPT_SUBCOMMAND, because there can be only one set of mutually
    exclusive subcommands; parse_options() will BUG() otherwise.

    There are other ways to tell parse_options() where to put the
    function associated with the subcommand given on the command line,
    but I didn't like them:

      - Change parse_options()'s signature by adding a pointer to
        subcommand function to be set to the function associated with
        the given subcommand, affecting all callsites, even those that
        don't have subcommands.

      - Introduce a specific parse_options_and_subcommand() variant
        with that extra funcion parameter.

  - I decided against automatically calling the subcommand function
    from within parse_options(), because:

      - There are commands that have to perform additional actions
        after option parsing but before calling the function
        implementing the specified subcommand.

      - The return code of the subcommand is usually the return code
        of the git command, but preserving the return code of the
        automatically called subcommand function would have made the
        API awkward.

  - Also add a OPT_SUBCOMMAND_F() variant to allow specifying an
    option flag: we have two subcommands that are purposefully
    excluded from completion ('git remote rm' and 'git stash save'),
    so they'll have to be specified with the PARSE_OPT_NOCOMPLETE
    flag.

  - Some of the 'parse_opt_flags' don't make sense with subcommands,
    and using them is probably just an oversight or misunderstanding.
    Therefore parse_options() will BUG() when invoked with any of the
    following flags while the options array contains at least one
    OPT_SUBCOMMAND:

      - PARSE_OPT_KEEP_DASHDASH: parse_options() stops parsing
        arguments when encountering a "--" argument, so it doesn't
        make sense to expect and keep one before a subcommand, because
        it would prevent the parsing of the subcommand.

        However, this flag is allowed in combination with the
        PARSE_OPT_SUBCOMMAND_OPTIONAL flag, because the double dash
        might be meaningful for the command's default operation mode,
        e.g. to disambiguate refs and pathspecs.

      - PARSE_OPT_STOP_AT_NON_OPTION: As its name suggests, this flag
        tells parse_options() to stop as soon as it encouners a
        non-option argument, but subcommands are by definition not
        options...  so how could they be parsed, then?!

      - PARSE_OPT_KEEP_UNKNOWN: This flag can be used to collect any
        unknown --options and then pass them to a different command or
        subsystem.  Surely if a command has subcommands, then this
        functionality should rather be delegated to one of those
        subcommands, and not performed by the command itself.

        However, this flag is allowed in combination with the
        PARSE_OPT_SUBCOMMAND_OPTIONAL flag, making possible to pass
        --options to the default operation mode.

  - If the command with subcommands has a default operation mode, then
    all arguments to the command must preceed the arguments of the
    subcommand.

    AFAICT we don't have any commands where this makes a difference,
    because in those commands either only the command accepts any
    arguments ('notes' and 'remote'), or only the default subcommand
    ('reflog' and 'stash'), but never both.

  - The 'argv' array passed to subcommand functions currently starts
    with the name of the subcommand.  Keep this behavior.  AFAICT no
    subcommand functions depend on the actual content of 'argv[0]',
    but the parse_options() call handling their options expects that
    the options start at argv[1].

  - To support handling subcommands programmatically in our Bash
    completion script, 'git cmd --git-completion-helper' will now list
    both subcommands and regular --options, if any.  This means that
    the completion script will have to separate subcommands (i.e.
    words without a double dash prefix) from --options on its own, but
    that's rather easy to do, and it's not much work either, because
    the number of subcommands a command might have is rather low, and
    those commands accept only a single --option or none at all.  An
    alternative would be to introduce a separate option that lists
    only subcommands, but then the completion script would need not
    one but two git invocations and command substitutions for commands
    with subcommands.

    Note that this change doesn't affect the behavior of our Bash
    completion script, because when completing the --option of a
    command with subcommands, e.g. for 'git notes --<TAB>', then all
    subcommands will be filtered out anyway, as none of them will
    match the word to be completed starting with that double dash
    prefix.

[1] Except 'git rerere', because many of its subcommands are
    implemented in the bodies of the if-else if statements parsing the
    command's subcommand argument.

[2] Except 'credential', 'credential-store' and 'fsmonitor--daemon',
    because some of the functions implementing their subcommands take
    special parameters.

Signed-off-by: SZEDER Gábor <szeder.dev@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2022-08-19 11:13:14 -07:00

1213 lines
33 KiB
C
Raw Blame History

/*
* Blame
*
* Copyright (c) 2006, 2014 by its authors
* See COPYING for licensing conditions
*/
#include "cache.h"
#include "config.h"
#include "color.h"
#include "builtin.h"
#include "repository.h"
#include "commit.h"
#include "diff.h"
#include "revision.h"
#include "quote.h"
#include "string-list.h"
#include "mailmap.h"
#include "parse-options.h"
#include "prio-queue.h"
#include "utf8.h"
#include "userdiff.h"
#include "line-range.h"
#include "line-log.h"
#include "dir.h"
#include "progress.h"
#include "object-store.h"
#include "blame.h"
#include "refs.h"
#include "tag.h"
static char blame_usage[] = N_("git blame [<options>] [<rev-opts>] [<rev>] [--] <file>");
static const char *blame_opt_usage[] = {
blame_usage,
"",
N_("<rev-opts> are documented in git-rev-list(1)"),
NULL
};
static int longest_file;
static int longest_author;
static int max_orig_digits;
static int max_digits;
static int max_score_digits;
static int show_root;
static int reverse;
static int blank_boundary;
static int incremental;
static int xdl_opts;
static int abbrev = -1;
static int no_whole_file_rename;
static int show_progress;
static char repeated_meta_color[COLOR_MAXLEN];
static int coloring_mode;
static struct string_list ignore_revs_file_list = STRING_LIST_INIT_NODUP;
static int mark_unblamable_lines;
static int mark_ignored_lines;
static struct date_mode blame_date_mode = { DATE_ISO8601 };
static size_t blame_date_width;
static struct string_list mailmap = STRING_LIST_INIT_NODUP;
#ifndef DEBUG_BLAME
#define DEBUG_BLAME 0
#endif
static unsigned blame_move_score;
static unsigned blame_copy_score;
/* Remember to update object flag allocation in object.h */
#define METAINFO_SHOWN (1u<<12)
#define MORE_THAN_ONE_PATH (1u<<13)
struct progress_info {
struct progress *progress;
int blamed_lines;
};
static const char *nth_line_cb(void *data, long lno)
{
return blame_nth_line((struct blame_scoreboard *)data, lno);
}
/*
* Information on commits, used for output.
*/
struct commit_info {
struct strbuf author;
struct strbuf author_mail;
timestamp_t author_time;
struct strbuf author_tz;
/* filled only when asked for details */
struct strbuf committer;
struct strbuf committer_mail;
timestamp_t committer_time;
struct strbuf committer_tz;
struct strbuf summary;
};
#define COMMIT_INFO_INIT { \
.author = STRBUF_INIT, \
.author_mail = STRBUF_INIT, \
.author_tz = STRBUF_INIT, \
.committer = STRBUF_INIT, \
.committer_mail = STRBUF_INIT, \
.committer_tz = STRBUF_INIT, \
.summary = STRBUF_INIT, \
}
/*
* Parse author/committer line in the commit object buffer
*/
static void get_ac_line(const char *inbuf, const char *what,
struct strbuf *name, struct strbuf *mail,
timestamp_t *time, struct strbuf *tz)
{
struct ident_split ident;
size_t len, maillen, namelen;
char *tmp, *endp;
const char *namebuf, *mailbuf;
tmp = strstr(inbuf, what);
if (!tmp)
goto error_out;
tmp += strlen(what);
endp = strchr(tmp, '\n');
if (!endp)
len = strlen(tmp);
else
len = endp - tmp;
if (split_ident_line(&ident, tmp, len)) {
error_out:
/* Ugh */
tmp = "(unknown)";
strbuf_addstr(name, tmp);
strbuf_addstr(mail, tmp);
strbuf_addstr(tz, tmp);
*time = 0;
return;
}
namelen = ident.name_end - ident.name_begin;
namebuf = ident.name_begin;
maillen = ident.mail_end - ident.mail_begin;
mailbuf = ident.mail_begin;
if (ident.date_begin && ident.date_end)
*time = strtoul(ident.date_begin, NULL, 10);
else
*time = 0;
if (ident.tz_begin && ident.tz_end)
strbuf_add(tz, ident.tz_begin, ident.tz_end - ident.tz_begin);
else
strbuf_addstr(tz, "(unknown)");
/*
* Now, convert both name and e-mail using mailmap
*/
map_user(&mailmap, &mailbuf, &maillen,
&namebuf, &namelen);
strbuf_addf(mail, "<%.*s>", (int)maillen, mailbuf);
strbuf_add(name, namebuf, namelen);
}
static void commit_info_destroy(struct commit_info *ci)
{
strbuf_release(&ci->author);
strbuf_release(&ci->author_mail);
strbuf_release(&ci->author_tz);
strbuf_release(&ci->committer);
strbuf_release(&ci->committer_mail);
strbuf_release(&ci->committer_tz);
strbuf_release(&ci->summary);
}
static void get_commit_info(struct commit *commit,
struct commit_info *ret,
int detailed)
{
int len;
const char *subject, *encoding;
const char *message;
encoding = get_log_output_encoding();
message = logmsg_reencode(commit, NULL, encoding);
get_ac_line(message, "\nauthor ",
&ret->author, &ret->author_mail,
&ret->author_time, &ret->author_tz);
if (!detailed) {
unuse_commit_buffer(commit, message);
return;
}
get_ac_line(message, "\ncommitter ",
&ret->committer, &ret->committer_mail,
&ret->committer_time, &ret->committer_tz);
len = find_commit_subject(message, &subject);
if (len)
strbuf_add(&ret->summary, subject, len);
else
strbuf_addf(&ret->summary, "(%s)", oid_to_hex(&commit->object.oid));
unuse_commit_buffer(commit, message);
}
/*
* Write out any suspect information which depends on the path. This must be
* handled separately from emit_one_suspect_detail(), because a given commit
* may have changes in multiple paths. So this needs to appear each time
* we mention a new group.
*
* To allow LF and other nonportable characters in pathnames,
* they are c-style quoted as needed.
*/
static void write_filename_info(struct blame_origin *suspect)
{
if (suspect->previous) {
struct blame_origin *prev = suspect->previous;
printf("previous %s ", oid_to_hex(&prev->commit->object.oid));
write_name_quoted(prev->path, stdout, '\n');
}
printf("filename ");
write_name_quoted(suspect->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 blame_origin *suspect, int repeat)
{
struct commit_info ci = COMMIT_INFO_INIT;
if (!repeat && (suspect->commit->object.flags & METAINFO_SHOWN))
return 0;
suspect->commit->object.flags |= METAINFO_SHOWN;
get_commit_info(suspect->commit, &ci, 1);
printf("author %s\n", ci.author.buf);
printf("author-mail %s\n", ci.author_mail.buf);
printf("author-time %"PRItime"\n", ci.author_time);
printf("author-tz %s\n", ci.author_tz.buf);
printf("committer %s\n", ci.committer.buf);
printf("committer-mail %s\n", ci.committer_mail.buf);
printf("committer-time %"PRItime"\n", ci.committer_time);
printf("committer-tz %s\n", ci.committer_tz.buf);
printf("summary %s\n", ci.summary.buf);
if (suspect->commit->object.flags & UNINTERESTING)
printf("boundary\n");
commit_info_destroy(&ci);
return 1;
}
/*
* The blame_entry is found to be guilty for the range.
* Show it in incremental output.
*/
static void found_guilty_entry(struct blame_entry *ent, void *data)
{
struct progress_info *pi = (struct progress_info *)data;
if (incremental) {
struct blame_origin *suspect = ent->suspect;
printf("%s %d %d %d\n",
oid_to_hex(&suspect->commit->object.oid),
ent->s_lno + 1, ent->lno + 1, ent->num_lines);
emit_one_suspect_detail(suspect, 0);
write_filename_info(suspect);
maybe_flush_or_die(stdout, "stdout");
}
pi->blamed_lines += ent->num_lines;
display_progress(pi->progress, pi->blamed_lines);
}
static const char *format_time(timestamp_t time, const char *tz_str,
int show_raw_time)
{
static struct strbuf time_buf = STRBUF_INIT;
strbuf_reset(&time_buf);
if (show_raw_time) {
strbuf_addf(&time_buf, "%"PRItime" %s", time, tz_str);
}
else {
const char *time_str;
size_t time_width;
int tz;
tz = atoi(tz_str);
time_str = show_date(time, tz, &blame_date_mode);
strbuf_addstr(&time_buf, time_str);
/*
* Add space paddings to time_buf to display a fixed width
* string, and use time_width for display width calibration.
*/
for (time_width = utf8_strwidth(time_str);
time_width < blame_date_width;
time_width++)
strbuf_addch(&time_buf, ' ');
}
return time_buf.buf;
}
#define OUTPUT_ANNOTATE_COMPAT (1U<<0)
#define OUTPUT_LONG_OBJECT_NAME (1U<<1)
#define OUTPUT_RAW_TIMESTAMP (1U<<2)
#define OUTPUT_PORCELAIN (1U<<3)
#define OUTPUT_SHOW_NAME (1U<<4)
#define OUTPUT_SHOW_NUMBER (1U<<5)
#define OUTPUT_SHOW_SCORE (1U<<6)
#define OUTPUT_NO_AUTHOR (1U<<7)
#define OUTPUT_SHOW_EMAIL (1U<<8)
#define OUTPUT_LINE_PORCELAIN (1U<<9)
#define OUTPUT_COLOR_LINE (1U<<10)
#define OUTPUT_SHOW_AGE_WITH_COLOR (1U<<11)
static void emit_porcelain_details(struct blame_origin *suspect, int repeat)
{
if (emit_one_suspect_detail(suspect, repeat) ||
(suspect->commit->object.flags & MORE_THAN_ONE_PATH))
write_filename_info(suspect);
}
static void emit_porcelain(struct blame_scoreboard *sb, struct blame_entry *ent,
int opt)
{
int repeat = opt & OUTPUT_LINE_PORCELAIN;
int cnt;
const char *cp;
struct blame_origin *suspect = ent->suspect;
char hex[GIT_MAX_HEXSZ + 1];
oid_to_hex_r(hex, &suspect->commit->object.oid);
printf("%s %d %d %d\n",
hex,
ent->s_lno + 1,
ent->lno + 1,
ent->num_lines);
emit_porcelain_details(suspect, repeat);
cp = blame_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 struct color_field {
timestamp_t hop;
char col[COLOR_MAXLEN];
} *colorfield;
static int colorfield_nr, colorfield_alloc;
static void parse_color_fields(const char *s)
{
struct string_list l = STRING_LIST_INIT_DUP;
struct string_list_item *item;
enum { EXPECT_DATE, EXPECT_COLOR } next = EXPECT_COLOR;
colorfield_nr = 0;
/* Ideally this would be stripped and split at the same time? */
string_list_split(&l, s, ',', -1);
ALLOC_GROW(colorfield, colorfield_nr + 1, colorfield_alloc);
for_each_string_list_item(item, &l) {
switch (next) {
case EXPECT_DATE:
colorfield[colorfield_nr].hop = approxidate(item->string);
next = EXPECT_COLOR;
colorfield_nr++;
ALLOC_GROW(colorfield, colorfield_nr + 1, colorfield_alloc);
break;
case EXPECT_COLOR:
if (color_parse(item->string, colorfield[colorfield_nr].col))
die(_("expecting a color: %s"), item->string);
next = EXPECT_DATE;
break;
}
}
if (next == EXPECT_COLOR)
die(_("must end with a color"));
colorfield[colorfield_nr].hop = TIME_MAX;
string_list_clear(&l, 0);
}
static void setup_default_color_by_age(void)
{
parse_color_fields("blue,12 month ago,white,1 month ago,red");
}
static void determine_line_heat(struct commit_info *ci, const char **dest_color)
{
int i = 0;
while (i < colorfield_nr && ci->author_time > colorfield[i].hop)
i++;
*dest_color = colorfield[i].col;
}
static void emit_other(struct blame_scoreboard *sb, struct blame_entry *ent, int opt)
{
int cnt;
const char *cp;
struct blame_origin *suspect = ent->suspect;
struct commit_info ci = COMMIT_INFO_INIT;
char hex[GIT_MAX_HEXSZ + 1];
int show_raw_time = !!(opt & OUTPUT_RAW_TIMESTAMP);
const char *default_color = NULL, *color = NULL, *reset = NULL;
get_commit_info(suspect->commit, &ci, 1);
oid_to_hex_r(hex, &suspect->commit->object.oid);
cp = blame_nth_line(sb, ent->lno);
if (opt & OUTPUT_SHOW_AGE_WITH_COLOR) {
determine_line_heat(&ci, &default_color);
color = default_color;
reset = GIT_COLOR_RESET;
}
for (cnt = 0; cnt < ent->num_lines; cnt++) {
char ch;
int length = (opt & OUTPUT_LONG_OBJECT_NAME) ? the_hash_algo->hexsz : abbrev;
if (opt & OUTPUT_COLOR_LINE) {
if (cnt > 0) {
color = repeated_meta_color;
reset = GIT_COLOR_RESET;
} else {
color = default_color ? default_color : NULL;
reset = default_color ? GIT_COLOR_RESET : NULL;
}
}
if (color)
fputs(color, stdout);
if (suspect->commit->object.flags & UNINTERESTING) {
if (blank_boundary)
memset(hex, ' ', length);
else if (!(opt & OUTPUT_ANNOTATE_COMPAT)) {
length--;
putchar('^');
}
}
if (mark_unblamable_lines && ent->unblamable) {
length--;
putchar('*');
}
if (mark_ignored_lines && ent->ignored) {
length--;
putchar('?');
}
printf("%.*s", length, hex);
if (opt & OUTPUT_ANNOTATE_COMPAT) {
const char *name;
if (opt & OUTPUT_SHOW_EMAIL)
name = ci.author_mail.buf;
else
name = ci.author.buf;
printf("\t(%10s\t%10s\t%d)", name,
format_time(ci.author_time, ci.author_tz.buf,
show_raw_time),
ent->lno + 1 + cnt);
} else {
if (opt & OUTPUT_SHOW_SCORE)
printf(" %*d %02d",
max_score_digits, ent->score,
ent->suspect->refcnt);
if (opt & OUTPUT_SHOW_NAME)
printf(" %-*.*s", longest_file, longest_file,
suspect->path);
if (opt & OUTPUT_SHOW_NUMBER)
printf(" %*d", max_orig_digits,
ent->s_lno + 1 + cnt);
if (!(opt & OUTPUT_NO_AUTHOR)) {
const char *name;
int pad;
if (opt & OUTPUT_SHOW_EMAIL)
name = ci.author_mail.buf;
else
name = ci.author.buf;
pad = longest_author - utf8_strwidth(name);
printf(" (%s%*s %10s",
name, pad, "",
format_time(ci.author_time,
ci.author_tz.buf,
show_raw_time));
}
printf(" %*d) ",
max_digits, ent->lno + 1 + cnt);
}
if (reset)
fputs(reset, stdout);
do {
ch = *cp++;
putchar(ch);
} while (ch != '\n' &&
cp < sb->final_buf + sb->final_buf_size);
}
if (sb->final_buf_size && cp[-1] != '\n')
putchar('\n');
commit_info_destroy(&ci);
}
static void output(struct blame_scoreboard *sb, int option)
{
struct blame_entry *ent;
if (option & OUTPUT_PORCELAIN) {
for (ent = sb->ent; ent; ent = ent->next) {
int count = 0;
struct blame_origin *suspect;
struct commit *commit = ent->suspect->commit;
if (commit->object.flags & MORE_THAN_ONE_PATH)
continue;
for (suspect = get_blame_suspects(commit); suspect; suspect = suspect->next) {
if (suspect->guilty && count++) {
commit->object.flags |= MORE_THAN_ONE_PATH;
break;
}
}
}
}
for (ent = sb->ent; ent; ent = ent->next) {
if (option & OUTPUT_PORCELAIN)
emit_porcelain(sb, ent, option);
else {
emit_other(sb, ent, option);
}
}
}
/*
* 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_or_warn(graft_file, "r");
struct strbuf buf = STRBUF_INIT;
if (!fp)
return -1;
while (!strbuf_getwholeline(&buf, fp, '\n')) {
/* The format is just "Commit Parent1 Parent2 ...\n" */
struct commit_graft *graft = read_graft_line(&buf);
if (graft)
register_commit_graft(the_repository, graft, 0);
}
fclose(fp);
strbuf_release(&buf);
return 0;
}
static int update_auto_abbrev(int auto_abbrev, struct blame_origin *suspect)
{
const char *uniq = find_unique_abbrev(&suspect->commit->object.oid,
auto_abbrev);
int len = strlen(uniq);
if (auto_abbrev < len)
return len;
return auto_abbrev;
}
/*
* How many columns do we need to show line numbers, authors,
* and filenames?
*/
static void find_alignment(struct blame_scoreboard *sb, int *option)
{
int longest_src_lines = 0;
int longest_dst_lines = 0;
unsigned largest_score = 0;
struct blame_entry *e;
int compute_auto_abbrev = (abbrev < 0);
int auto_abbrev = DEFAULT_ABBREV;
for (e = sb->ent; e; e = e->next) {
struct blame_origin *suspect = e->suspect;
int num;
if (compute_auto_abbrev)
auto_abbrev = update_auto_abbrev(auto_abbrev, suspect);
if (strcmp(suspect->path, sb->path))
*option |= OUTPUT_SHOW_NAME;
num = strlen(suspect->path);
if (longest_file < num)
longest_file = num;
if (!(suspect->commit->object.flags & METAINFO_SHOWN)) {
struct commit_info ci = COMMIT_INFO_INIT;
suspect->commit->object.flags |= METAINFO_SHOWN;
get_commit_info(suspect->commit, &ci, 1);
if (*option & OUTPUT_SHOW_EMAIL)
num = utf8_strwidth(ci.author_mail.buf);
else
num = utf8_strwidth(ci.author.buf);
if (longest_author < num)
longest_author = num;
commit_info_destroy(&ci);
}
num = e->s_lno + e->num_lines;
if (longest_src_lines < num)
longest_src_lines = num;
num = e->lno + e->num_lines;
if (longest_dst_lines < num)
longest_dst_lines = num;
if (largest_score < blame_entry_score(sb, e))
largest_score = blame_entry_score(sb, e);
}
max_orig_digits = decimal_width(longest_src_lines);
max_digits = decimal_width(longest_dst_lines);
max_score_digits = decimal_width(largest_score);
if (compute_auto_abbrev)
/* one more abbrev length is needed for the boundary commit */
abbrev = auto_abbrev + 1;
}
static void sanity_check_on_fail(struct blame_scoreboard *sb, int baa)
{
int opt = OUTPUT_SHOW_SCORE | OUTPUT_SHOW_NUMBER | OUTPUT_SHOW_NAME;
find_alignment(sb, &opt);
output(sb, opt);
die("Baa %d!", baa);
}
static unsigned parse_score(const char *arg)
{
char *end;
unsigned long score = strtoul(arg, &end, 10);
if (*end)
return 0;
return score;
}
static const char *add_prefix(const char *prefix, const char *path)
{
return prefix_path(prefix, prefix ? strlen(prefix) : 0, path);
}
static int git_blame_config(const char *var, const char *value, void *cb)
{
if (!strcmp(var, "blame.showroot")) {
show_root = git_config_bool(var, value);
return 0;
}
if (!strcmp(var, "blame.blankboundary")) {
blank_boundary = git_config_bool(var, value);
return 0;
}
if (!strcmp(var, "blame.showemail")) {
int *output_option = cb;
if (git_config_bool(var, value))
*output_option |= OUTPUT_SHOW_EMAIL;
else
*output_option &= ~OUTPUT_SHOW_EMAIL;
return 0;
}
if (!strcmp(var, "blame.date")) {
if (!value)
return config_error_nonbool(var);
parse_date_format(value, &blame_date_mode);
return 0;
}
if (!strcmp(var, "blame.ignorerevsfile")) {
const char *str;
int ret;
ret = git_config_pathname(&str, var, value);
if (ret)
return ret;
string_list_insert(&ignore_revs_file_list, str);
return 0;
}
if (!strcmp(var, "blame.markunblamablelines")) {
mark_unblamable_lines = git_config_bool(var, value);
return 0;
}
if (!strcmp(var, "blame.markignoredlines")) {
mark_ignored_lines = git_config_bool(var, value);
return 0;
}
if (!strcmp(var, "color.blame.repeatedlines")) {
if (color_parse_mem(value, strlen(value), repeated_meta_color))
warning(_("invalid value for '%s': '%s'"),
"color.blame.repeatedLines", value);
return 0;
}
if (!strcmp(var, "color.blame.highlightrecent")) {
parse_color_fields(value);
return 0;
}
if (!strcmp(var, "blame.coloring")) {
if (!strcmp(value, "repeatedLines")) {
coloring_mode |= OUTPUT_COLOR_LINE;
} else if (!strcmp(value, "highlightRecent")) {
coloring_mode |= OUTPUT_SHOW_AGE_WITH_COLOR;
} else if (!strcmp(value, "none")) {
coloring_mode &= ~(OUTPUT_COLOR_LINE |
OUTPUT_SHOW_AGE_WITH_COLOR);
} else {
warning(_("invalid value for '%s': '%s'"),
"blame.coloring", value);
return 0;
}
}
if (git_diff_heuristic_config(var, value, cb) < 0)
return -1;
if (userdiff_config(var, value) < 0)
return -1;
return git_default_config(var, value, cb);
}
static int blame_copy_callback(const struct option *option, const char *arg, int unset)
{
int *opt = option->value;
BUG_ON_OPT_NEG(unset);
/*
* -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;
BUG_ON_OPT_NEG(unset);
*opt |= PICKAXE_BLAME_MOVE;
if (arg)
blame_move_score = parse_score(arg);
return 0;
}
static int is_a_rev(const char *name)
{
struct object_id oid;
if (get_oid(name, &oid))
return 0;
return OBJ_NONE < oid_object_info(the_repository, &oid, NULL);
}
static int peel_to_commit_oid(struct object_id *oid_ret, void *cbdata)
{
struct repository *r = ((struct blame_scoreboard *)cbdata)->repo;
struct object_id oid;
oidcpy(&oid, oid_ret);
while (1) {
struct object *obj;
int kind = oid_object_info(r, &oid, NULL);
if (kind == OBJ_COMMIT) {
oidcpy(oid_ret, &oid);
return 0;
}
if (kind != OBJ_TAG)
return -1;
obj = deref_tag(r, parse_object(r, &oid), NULL, 0);
if (!obj)
return -1;
oidcpy(&oid, &obj->oid);
}
}
static void build_ignorelist(struct blame_scoreboard *sb,
struct string_list *ignore_revs_file_list,
struct string_list *ignore_rev_list)
{
struct string_list_item *i;
struct object_id oid;
oidset_init(&sb->ignore_list, 0);
for_each_string_list_item(i, ignore_revs_file_list) {
if (!strcmp(i->string, ""))
oidset_clear(&sb->ignore_list);
else
oidset_parse_file_carefully(&sb->ignore_list, i->string,
peel_to_commit_oid, sb);
}
for_each_string_list_item(i, ignore_rev_list) {
if (get_oid_committish(i->string, &oid) ||
peel_to_commit_oid(&oid, sb))
die(_("cannot find revision %s to ignore"), i->string);
oidset_insert(&sb->ignore_list, &oid);
}
}
int cmd_blame(int argc, const char **argv, const char *prefix)
{
struct rev_info revs;
const char *path;
struct blame_scoreboard sb;
struct blame_origin *o;
struct blame_entry *ent = NULL;
long dashdash_pos, lno;
struct progress_info pi = { NULL, 0 };
struct string_list range_list = STRING_LIST_INIT_NODUP;
struct string_list ignore_rev_list = STRING_LIST_INIT_NODUP;
int output_option = 0, opt = 0;
int show_stats = 0;
const char *revs_file = NULL;
const char *contents_from = NULL;
const struct option options[] = {
OPT_BOOL(0, "incremental", &incremental, N_("show blame entries as we find them, incrementally")),
OPT_BOOL('b', NULL, &blank_boundary, N_("do not show object names of boundary commits (Default: off)")),
OPT_BOOL(0, "root", &show_root, N_("do not treat root commits as boundaries (Default: off)")),
OPT_BOOL(0, "show-stats", &show_stats, N_("show work cost statistics")),
OPT_BOOL(0, "progress", &show_progress, N_("force progress reporting")),
OPT_BIT(0, "score-debug", &output_option, N_("show output score for blame entries"), OUTPUT_SHOW_SCORE),
OPT_BIT('f', "show-name", &output_option, N_("show original filename (Default: auto)"), OUTPUT_SHOW_NAME),
OPT_BIT('n', "show-number", &output_option, N_("show original linenumber (Default: off)"), OUTPUT_SHOW_NUMBER),
OPT_BIT('p', "porcelain", &output_option, N_("show in a format designed for machine consumption"), OUTPUT_PORCELAIN),
OPT_BIT(0, "line-porcelain", &output_option, N_("show porcelain format with per-line commit information"), OUTPUT_PORCELAIN|OUTPUT_LINE_PORCELAIN),
OPT_BIT('c', NULL, &output_option, N_("use the same output mode as git-annotate (Default: off)"), OUTPUT_ANNOTATE_COMPAT),
OPT_BIT('t', NULL, &output_option, N_("show raw timestamp (Default: off)"), OUTPUT_RAW_TIMESTAMP),
OPT_BIT('l', NULL, &output_option, N_("show long commit SHA1 (Default: off)"), OUTPUT_LONG_OBJECT_NAME),
OPT_BIT('s', NULL, &output_option, N_("suppress author name and timestamp (Default: off)"), OUTPUT_NO_AUTHOR),
OPT_BIT('e', "show-email", &output_option, N_("show author email instead of name (Default: off)"), OUTPUT_SHOW_EMAIL),
OPT_BIT('w', NULL, &xdl_opts, N_("ignore whitespace differences"), XDF_IGNORE_WHITESPACE),
OPT_STRING_LIST(0, "ignore-rev", &ignore_rev_list, N_("rev"), N_("ignore <rev> when blaming")),
OPT_STRING_LIST(0, "ignore-revs-file", &ignore_revs_file_list, N_("file"), N_("ignore revisions from <file>")),
OPT_BIT(0, "color-lines", &output_option, N_("color redundant metadata from previous line differently"), OUTPUT_COLOR_LINE),
OPT_BIT(0, "color-by-age", &output_option, N_("color lines by age"), OUTPUT_SHOW_AGE_WITH_COLOR),
OPT_BIT(0, "minimal", &xdl_opts, N_("spend extra cycles to find better match"), XDF_NEED_MINIMAL),
OPT_STRING('S', NULL, &revs_file, N_("file"), N_("use revisions from <file> instead of calling git-rev-list")),
OPT_STRING(0, "contents", &contents_from, N_("file"), N_("use <file>'s contents as the final image")),
OPT_CALLBACK_F('C', NULL, &opt, N_("score"), N_("find line copies within and across files"), PARSE_OPT_OPTARG, blame_copy_callback),
OPT_CALLBACK_F('M', NULL, &opt, N_("score"), N_("find line movements within and across files"), PARSE_OPT_OPTARG, blame_move_callback),
OPT_STRING_LIST('L', NULL, &range_list, N_("range"),
N_("process only line range <start>,<end> or function :<funcname>")),
OPT__ABBREV(&abbrev),
OPT_END()
};
struct parse_opt_ctx_t ctx;
int cmd_is_annotate = !strcmp(argv[0], "annotate");
struct range_set ranges;
unsigned int range_i;
long anchor;
const int hexsz = the_hash_algo->hexsz;
long num_lines = 0;
setup_default_color_by_age();
git_config(git_blame_config, &output_option);
repo_init_revisions(the_repository, &revs, NULL);
revs.date_mode = blame_date_mode;
revs.diffopt.flags.allow_textconv = 1;
revs.diffopt.flags.follow_renames = 1;
save_commit_buffer = 0;
dashdash_pos = 0;
show_progress = -1;
parse_options_start(&ctx, argc, argv, prefix, options,
PARSE_OPT_KEEP_DASHDASH | PARSE_OPT_KEEP_ARGV0);
for (;;) {
switch (parse_options_step(&ctx, options, blame_opt_usage)) {
case PARSE_OPT_NON_OPTION:
case PARSE_OPT_UNKNOWN:
break;
case PARSE_OPT_HELP:
case PARSE_OPT_ERROR:
case PARSE_OPT_SUBCOMMAND:
exit(129);
case PARSE_OPT_COMPLETE:
exit(0);
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:
revision_opts_finish(&revs);
no_whole_file_rename = !revs.diffopt.flags.follow_renames;
xdl_opts |= revs.diffopt.xdl_opts & XDF_INDENT_HEURISTIC;
revs.diffopt.flags.follow_renames = 0;
argc = parse_options_end(&ctx);
prepare_repo_settings(the_repository);
the_repository->settings.command_requires_full_index = 0;
if (incremental || (output_option & OUTPUT_PORCELAIN)) {
if (show_progress > 0)
die(_("--progress can't be used with --incremental or porcelain formats"));
show_progress = 0;
} else if (show_progress < 0)
show_progress = isatty(2);
if (0 < abbrev && abbrev < hexsz)
/* one more abbrev length is needed for the boundary commit */
abbrev++;
else if (!abbrev)
abbrev = hexsz;
if (revs_file && read_ancestry(revs_file))
die_errno("reading graft file '%s' failed", revs_file);
if (cmd_is_annotate) {
output_option |= OUTPUT_ANNOTATE_COMPAT;
blame_date_mode.type = DATE_ISO8601;
} else {
blame_date_mode = revs.date_mode;
}
/* The maximum width used to show the dates */
switch (blame_date_mode.type) {
case DATE_RFC2822:
blame_date_width = sizeof("Thu, 19 Oct 2006 16:00:04 -0700");
break;
case DATE_ISO8601_STRICT:
blame_date_width = sizeof("2006-10-19T16:00:04-07:00");
break;
case DATE_ISO8601:
blame_date_width = sizeof("2006-10-19 16:00:04 -0700");
break;
case DATE_RAW:
blame_date_width = sizeof("1161298804 -0700");
break;
case DATE_UNIX:
blame_date_width = sizeof("1161298804");
break;
case DATE_SHORT:
blame_date_width = sizeof("2006-10-19");
break;
case DATE_RELATIVE:
/*
* TRANSLATORS: This string is used to tell us the
* maximum display width for a relative timestamp in
* "git blame" output. For C locale, "4 years, 11
* months ago", which takes 22 places, is the longest
* among various forms of relative timestamps, but
* your language may need more or fewer display
* columns.
*/
blame_date_width = utf8_strwidth(_("4 years, 11 months ago")) + 1; /* add the null */
break;
case DATE_HUMAN:
/* If the year is shown, no time is shown */
blame_date_width = sizeof("Thu Oct 19 16:00");
break;
case DATE_NORMAL:
blame_date_width = sizeof("Thu Oct 19 16:00:04 2006 -0700");
break;
case DATE_STRFTIME:
blame_date_width = strlen(show_date(0, 0, &blame_date_mode)) + 1; /* add the null */
break;
}
blame_date_width -= 1; /* strip the null */
if (revs.diffopt.flags.find_copies_harder)
opt |= (PICKAXE_BLAME_COPY | PICKAXE_BLAME_MOVE |
PICKAXE_BLAME_COPY_HARDER);
/*
* 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);
if (argc == 3 && is_a_rev(argv[argc - 1])) { /* (2b) */
path = add_prefix(prefix, argv[1]);
argv[1] = argv[2];
} else { /* (2a) */
if (argc == 2 && is_a_rev(argv[1]) && !get_git_work_tree())
die("missing <path> to blame");
path = add_prefix(prefix, argv[argc - 1]);
}
argv[argc - 1] = "--";
}
revs.disable_stdin = 1;
setup_revisions(argc, argv, &revs, NULL);
if (!revs.pending.nr && is_bare_repository()) {
struct commit *head_commit;
struct object_id head_oid;
if (!resolve_ref_unsafe("HEAD", RESOLVE_REF_READING,
&head_oid, NULL) ||
!(head_commit = lookup_commit_reference_gently(revs.repo,
&head_oid, 1)))
die("no such ref: HEAD");
add_pending_object(&revs, &head_commit->object, "HEAD");
}
init_scoreboard(&sb);
sb.revs = &revs;
sb.contents_from = contents_from;
sb.reverse = reverse;
sb.repo = the_repository;
sb.path = path;
build_ignorelist(&sb, &ignore_revs_file_list, &ignore_rev_list);
string_list_clear(&ignore_revs_file_list, 0);
string_list_clear(&ignore_rev_list, 0);
setup_scoreboard(&sb, &o);
/*
* Changed-path Bloom filters are disabled when looking
* for copies.
*/
if (!(opt & PICKAXE_BLAME_COPY))
setup_blame_bloom_data(&sb);
lno = sb.num_lines;
if (lno && !range_list.nr)
string_list_append(&range_list, "1");
anchor = 1;
range_set_init(&ranges, range_list.nr);
for (range_i = 0; range_i < range_list.nr; ++range_i) {
long bottom, top;
if (parse_range_arg(range_list.items[range_i].string,
nth_line_cb, &sb, lno, anchor,
&bottom, &top, sb.path,
the_repository->index))
usage(blame_usage);
if ((!lno && (top || bottom)) || lno < bottom)
die(Q_("file %s has only %lu line",
"file %s has only %lu lines",
lno), sb.path, lno);
if (bottom < 1)
bottom = 1;
if (top < 1 || lno < top)
top = lno;
bottom--;
range_set_append_unsafe(&ranges, bottom, top);
anchor = top + 1;
}
sort_and_merge_range_set(&ranges);
for (range_i = ranges.nr; range_i > 0; --range_i) {
const struct range *r = &ranges.ranges[range_i - 1];
ent = blame_entry_prepend(ent, r->start, r->end, o);
num_lines += (r->end - r->start);
}
if (!num_lines)
num_lines = sb.num_lines;
o->suspects = ent;
prio_queue_put(&sb.commits, o->commit);
blame_origin_decref(o);
range_set_release(&ranges);
string_list_clear(&range_list, 0);
sb.ent = NULL;
if (blame_move_score)
sb.move_score = blame_move_score;
if (blame_copy_score)
sb.copy_score = blame_copy_score;
sb.debug = DEBUG_BLAME;
sb.on_sanity_fail = &sanity_check_on_fail;
sb.show_root = show_root;
sb.xdl_opts = xdl_opts;
sb.no_whole_file_rename = no_whole_file_rename;
read_mailmap(&mailmap);
sb.found_guilty_entry = &found_guilty_entry;
sb.found_guilty_entry_data = &pi;
if (show_progress)
pi.progress = start_delayed_progress(_("Blaming lines"), num_lines);
assign_blame(&sb, opt);
stop_progress(&pi.progress);
if (!incremental)
setup_pager();
else
goto cleanup;
blame_sort_final(&sb);
blame_coalesce(&sb);
if (!(output_option & (OUTPUT_COLOR_LINE | OUTPUT_SHOW_AGE_WITH_COLOR)))
output_option |= coloring_mode;
if (!(output_option & OUTPUT_PORCELAIN)) {
find_alignment(&sb, &output_option);
if (!*repeated_meta_color &&
(output_option & OUTPUT_COLOR_LINE))
xsnprintf(repeated_meta_color,
sizeof(repeated_meta_color),
"%s", GIT_COLOR_CYAN);
}
if (output_option & OUTPUT_ANNOTATE_COMPAT)
output_option &= ~(OUTPUT_COLOR_LINE | OUTPUT_SHOW_AGE_WITH_COLOR);
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", sb.num_read_blob);
printf("num get patch: %d\n", sb.num_get_patch);
printf("num commits: %d\n", sb.num_commits);
}
cleanup:
cleanup_scoreboard(&sb);
release_revisions(&revs);
return 0;
}
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