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#include "cache.h"
#include "diff.h"
#include "commit.h"
#include "log-tree.h"
#include "reflog-walk.h"

static void show_parents(struct commit *commit, int abbrev)
{
struct commit_list *p;
for (p = commit->parents; p ; p = p->next) {
struct commit *parent = p->item;
printf(" %s", diff_unique_abbrev(parent->object.sha1, abbrev));
}
}

/*
* Search for "^[-A-Za-z]+: [^@]+@" pattern. It usually matches
* Signed-off-by: and Acked-by: lines.
*/
static int detect_any_signoff(char *letter, int size)
{
char ch, *cp;
int seen_colon = 0;
int seen_at = 0;
int seen_name = 0;
int seen_head = 0;

cp = letter + size;
while (letter <= --cp && (ch = *cp) == '\n')
continue;

while (letter <= cp) {
ch = *cp--;
if (ch == '\n')
break;

if (!seen_at) {
if (ch == '@')
seen_at = 1;
continue;
}
if (!seen_colon) {
if (ch == '@')
return 0;
else if (ch == ':')
seen_colon = 1;
else
seen_name = 1;
continue;
}
if (('A' <= ch && ch <= 'Z') ||
('a' <= ch && ch <= 'z') ||
ch == '-') {
seen_head = 1;
continue;
}
/* no empty last line doesn't match */
return 0;
}
return seen_head && seen_name;
}

static int append_signoff(char *buf, int buf_sz, int at, const char *signoff)
{
static const char signed_off_by[] = "Signed-off-by: ";
int signoff_len = strlen(signoff);
int has_signoff = 0;
char *cp = buf;

/* Do we have enough space to add it? */
if (buf_sz - at <= strlen(signed_off_by) + signoff_len + 3)
return at;

/* First see if we already have the sign-off by the signer */
while ((cp = strstr(cp, signed_off_by))) {

has_signoff = 1;

cp += strlen(signed_off_by);
if (cp + signoff_len >= buf + at)
break;
if (strncmp(cp, signoff, signoff_len))
continue;
if (!isspace(cp[signoff_len]))
continue;
/* we already have him */
return at;
}

if (!has_signoff)
has_signoff = detect_any_signoff(buf, at);

if (!has_signoff)
buf[at++] = '\n';

strcpy(buf + at, signed_off_by);
at += strlen(signed_off_by);
strcpy(buf + at, signoff);
at += signoff_len;
buf[at++] = '\n';
buf[at] = 0;
return at;
}

static unsigned int digits_in_number(unsigned int number)
{
unsigned int i = 10, result = 1;
while (i <= number) {
i *= 10;
result++;
}
return result;
}

void show_log(struct rev_info *opt, const char *sep)
{
static char this_header[16384];
struct log_info *log = opt->loginfo;
struct commit *commit = log->commit, *parent = log->parent;
int abbrev = opt->diffopt.abbrev;
int abbrev_commit = opt->abbrev_commit ? opt->abbrev : 40;
const char *extra;
int len;
const char *subject = NULL, *extra_headers = opt->extra_headers;

opt->loginfo = NULL;
if (!opt->verbose_header) {
if (opt->left_right) {
if (commit->object.flags & BOUNDARY)
putchar('-');
else if (commit->object.flags & SYMMETRIC_LEFT)
putchar('<');
else
putchar('>');
}
fputs(diff_unique_abbrev(commit->object.sha1, abbrev_commit), stdout);
if (opt->parents)
show_parents(commit, abbrev_commit);
putchar(opt->diffopt.line_termination);
return;
}

/*
* The "oneline" format has several special cases:
* - The pretty-printed commit lacks a newline at the end
* of the buffer, but we do want to make sure that we
* have a newline there. If the separator isn't already
* a newline, add an extra one.
* - unlike other log messages, the one-line format does
* not have an empty line between entries.
*/
extra = "";
if (*sep != '\n' && opt->commit_format == CMIT_FMT_ONELINE)
extra = "\n";
if (opt->shown_one && opt->commit_format != CMIT_FMT_ONELINE)
putchar(opt->diffopt.line_termination);
opt->shown_one = 1;

/*
* Print header line of header..
*/

if (opt->commit_format == CMIT_FMT_EMAIL) {
char *sha1 = sha1_to_hex(commit->object.sha1);
if (opt->total > 0) {
static char buffer[64];
snprintf(buffer, sizeof(buffer),
"Subject: [PATCH %0*d/%d] ",
digits_in_number(opt->total),
opt->nr, opt->total);
subject = buffer;
} else if (opt->total == 0)
subject = "Subject: [PATCH] ";
else
subject = "Subject: ";

printf("From %s Mon Sep 17 00:00:00 2001\n", sha1);
if (opt->message_id)
printf("Message-Id: <%s>\n", opt->message_id);
if (opt->ref_message_id)
printf("In-Reply-To: <%s>\nReferences: <%s>\n",
opt->ref_message_id, opt->ref_message_id);
if (opt->mime_boundary) {
static char subject_buffer[1024];
static char buffer[1024];
snprintf(subject_buffer, sizeof(subject_buffer) - 1,
"%s"
"MIME-Version: 1.0\n"
"Content-Type: multipart/mixed;\n"
" boundary=\"%s%s\"\n"
"\n"
"This is a multi-part message in MIME "
"format.\n"
"--%s%s\n"
"Content-Type: text/plain; "
"charset=UTF-8; format=fixed\n"
"Content-Transfer-Encoding: 8bit\n\n",
extra_headers ? extra_headers : "",
mime_boundary_leader, opt->mime_boundary,
mime_boundary_leader, opt->mime_boundary);
extra_headers = subject_buffer;

snprintf(buffer, sizeof(buffer) - 1,
"--%s%s\n"
"Content-Type: text/x-patch;\n"
" name=\"%s.diff\"\n"
"Content-Transfer-Encoding: 8bit\n"
"Content-Disposition: inline;\n"
" filename=\"%s.diff\"\n\n",
mime_boundary_leader, opt->mime_boundary,
sha1, sha1);
opt->diffopt.stat_sep = buffer;
}
} else {
fputs(diff_get_color(opt->diffopt.color_diff, DIFF_COMMIT),
stdout);
if (opt->commit_format != CMIT_FMT_ONELINE)
fputs("commit ", stdout);
if (opt->left_right) {
if (commit->object.flags & BOUNDARY)
putchar('-');
else if (commit->object.flags & SYMMETRIC_LEFT)
putchar('<');
else
putchar('>');
}
fputs(diff_unique_abbrev(commit->object.sha1, abbrev_commit),
stdout);
if (opt->parents)
show_parents(commit, abbrev_commit);
if (parent)
printf(" (from %s)",
diff_unique_abbrev(parent->object.sha1,
abbrev_commit));
printf("%s",
diff_get_color(opt->diffopt.color_diff, DIFF_RESET));
putchar(opt->commit_format == CMIT_FMT_ONELINE ? ' ' : '\n');
if (opt->reflog_info) {
show_reflog_message(opt->reflog_info,
opt->commit_format == CMIT_FMT_ONELINE,
opt->relative_date);
if (opt->commit_format == CMIT_FMT_ONELINE) {
printf("%s", sep);
return;
}
}
}

/*
* And then the pretty-printed message itself
*/
len = pretty_print_commit(opt->commit_format, commit, ~0u, this_header,
sizeof(this_header), abbrev, subject,
extra_headers, opt->relative_date);

if (opt->add_signoff)
len = append_signoff(this_header, sizeof(this_header), len,
opt->add_signoff);
printf("%s%s%s", this_header, extra, sep);
}

int log_tree_diff_flush(struct rev_info *opt)
{
diffcore_std(&opt->diffopt);

if (diff_queue_is_empty()) {
int saved_fmt = opt->diffopt.output_format;
opt->diffopt.output_format = DIFF_FORMAT_NO_OUTPUT;
diff_flush(&opt->diffopt);
opt->diffopt.output_format = saved_fmt;
return 0;
}

if (opt->loginfo && !opt->no_commit_id) {
/* When showing a verbose header (i.e. log message),
* and not in --pretty=oneline format, we would want
* an extra newline between the end of log and the
* output for readability.
*/
show_log(opt, opt->diffopt.msg_sep);
if (opt->verbose_header &&
opt->commit_format != CMIT_FMT_ONELINE) {
int pch = DIFF_FORMAT_DIFFSTAT | DIFF_FORMAT_PATCH;
if ((pch & opt->diffopt.output_format) == pch)
printf("---");
putchar('\n');
}
}
diff_flush(&opt->diffopt);
return 1;
}

static int do_diff_combined(struct rev_info *opt, struct commit *commit)
{
unsigned const char *sha1 = commit->object.sha1;

diff_tree_combined_merge(sha1, opt->dense_combined_merges, opt);
return !opt->loginfo;
}

/*
* Show the diff of a commit.
*
* Return true if we printed any log info messages
*/
static int log_tree_diff(struct rev_info *opt, struct commit *commit, struct log_info *log)
{
int showed_log;
struct commit_list *parents;
unsigned const char *sha1 = commit->object.sha1;

if (!opt->diff)
return 0;

/* Root commit? */
parents = commit->parents;
if (!parents) {
if (opt->show_root_diff) {
diff_root_tree_sha1(sha1, "", &opt->diffopt);
log_tree_diff_flush(opt);
}
return !opt->loginfo;
}

/* More than one parent? */
if (parents && parents->next) {
if (opt->ignore_merges)
return 0;
else if (opt->combine_merges)
return do_diff_combined(opt, commit);

/* If we show individual diffs, show the parent info */
log->parent = parents->item;
}

showed_log = 0;
for (;;) {
struct commit *parent = parents->item;

diff_tree_sha1(parent->object.sha1, sha1, "", &opt->diffopt);
log_tree_diff_flush(opt);

showed_log |= !opt->loginfo;

/* Set up the log info for the next parent, if any.. */
parents = parents->next;
if (!parents)
break;
log->parent = parents->item;
opt->loginfo = log;
}
return showed_log;
}

int log_tree_commit(struct rev_info *opt, struct commit *commit)
{
struct log_info log;
int shown;

log.commit = commit;
log.parent = NULL;
opt->loginfo = &log;

shown = log_tree_diff(opt, commit, &log);
if (!shown && opt->loginfo && opt->always_show_header) {
log.parent = NULL;
show_log(opt, "");
shown = 1;
}
opt->loginfo = NULL;
return shown;
}
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