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git/builtin/mailsplit.c

370 lines
7.3 KiB

/*
* Totally braindamaged mbox splitter program.
*
* It just splits a mbox into a list of files: "0001" "0002" ..
* so you can process them further from there.
*/
#include "cache.h"
#include "builtin.h"
#include "string-list.h"
#include "strbuf.h"
static const char git_mailsplit_usage[] =
"git mailsplit [-d<prec>] [-f<n>] [-b] [--keep-cr] -o<directory> [(<mbox>|<Maildir>)...]";
static int is_from_line(const char *line, int len)
{
const char *colon;
if (len < 20 || memcmp("From ", line, 5))
return 0;
colon = line + len - 2;
line += 5;
for (;;) {
if (colon < line)
return 0;
if (*--colon == ':')
break;
}
if (!isdigit(colon[-4]) ||
!isdigit(colon[-2]) ||
!isdigit(colon[-1]) ||
!isdigit(colon[ 1]) ||
!isdigit(colon[ 2]))
return 0;
/* year */
if (strtol(colon+3, NULL, 10) <= 90)
return 0;
/* Ok, close enough */
return 1;
}
static struct strbuf buf = STRBUF_INIT;
static int keep_cr;
static int mboxrd;
static int is_gtfrom(const struct strbuf *buf)
{
size_t min = strlen(">From ");
size_t ngt;
if (buf->len < min)
return 0;
ngt = strspn(buf->buf, ">");
return ngt && starts_with(buf->buf + ngt, "From ");
}
/* Called with the first line (potentially partial)
* already in buf[] -- normally that should begin with
* the Unix "From " line. Write it into the specified
* file.
*/
static int split_one(FILE *mbox, const char *name, int allow_bare)
{
FILE *output;
int fd;
int status = 0;
int is_bare = !is_from_line(buf.buf, buf.len);
if (is_bare && !allow_bare) {
fprintf(stderr, "corrupt mailbox\n");
exit(1);
}
fd = xopen(name, O_WRONLY | O_CREAT | O_EXCL, 0666);
output = xfdopen(fd, "w");
/* Copy it out, while searching for a line that begins with
* "From " and having something that looks like a date format.
*/
for (;;) {
if (!keep_cr && buf.len > 1 && buf.buf[buf.len-1] == '\n' &&
buf.buf[buf.len-2] == '\r') {
strbuf_setlen(&buf, buf.len-2);
strbuf_addch(&buf, '\n');
}
if (mboxrd && is_gtfrom(&buf))
strbuf_remove(&buf, 0, 1);
if (fwrite(buf.buf, 1, buf.len, output) != buf.len)
die_errno("cannot write output");
if (strbuf_getwholeline(&buf, mbox, '\n')) {
if (feof(mbox)) {
status = 1;
break;
}
die_errno("cannot read mbox");
}
if (!is_bare && is_from_line(buf.buf, buf.len))
break; /* done with one message */
}
fclose(output);
return status;
}
static int populate_maildir_list(struct string_list *list, const char *path)
{
DIR *dir;
struct dirent *dent;
char *name = NULL;
char *subs[] = { "cur", "new", NULL };
char **sub;
int ret = -1;
for (sub = subs; *sub; ++sub) {
free(name);
name = xstrfmt("%s/%s", path, *sub);
if (!(dir = opendir(name))) {
if (errno == ENOENT)
continue;
error_errno("cannot opendir %s", name);
goto out;
}
while ((dent = readdir(dir)) != NULL) {
if (dent->d_name[0] == '.')
continue;
free(name);
name = xstrfmt("%s/%s", *sub, dent->d_name);
string_list_insert(list, name);
}
closedir(dir);
}
ret = 0;
out:
free(name);
return ret;
}
static int maildir_filename_cmp(const char *a, const char *b)
{
while (*a && *b) {
if (isdigit(*a) && isdigit(*b)) {
long int na, nb;
na = strtol(a, (char **)&a, 10);
nb = strtol(b, (char **)&b, 10);
if (na != nb)
return na - nb;
/* strtol advanced our pointers */
}
else {
if (*a != *b)
return (unsigned char)*a - (unsigned char)*b;
a++;
b++;
}
}
return (unsigned char)*a - (unsigned char)*b;
}
static int split_maildir(const char *maildir, const char *dir,
int nr_prec, int skip)
{
char *file = NULL;
FILE *f = NULL;
int ret = -1;
int i;
struct string_list list = STRING_LIST_INIT_DUP;
list.cmp = maildir_filename_cmp;
if (populate_maildir_list(&list, maildir) < 0)
goto out;
for (i = 0; i < list.nr; i++) {
char *name;
free(file);
file = xstrfmt("%s/%s", maildir, list.items[i].string);
f = fopen(file, "r");
if (!f) {
error_errno("cannot open mail %s", file);
goto out;
}
if (strbuf_getwholeline(&buf, f, '\n')) {
error_errno("cannot read mail %s", file);
goto out;
}
name = xstrfmt("%s/%0*d", dir, nr_prec, ++skip);
split_one(f, name, 1);
free(name);
fclose(f);
f = NULL;
}
ret = skip;
out:
if (f)
fclose(f);
free(file);
string_list_clear(&list, 1);
return ret;
}
static int split_mbox(const char *file, const char *dir, int allow_bare,
int nr_prec, int skip)
{
int ret = -1;
int peek;
FILE *f = !strcmp(file, "-") ? stdin : fopen(file, "r");
int file_done = 0;
if (isatty(fileno(f)))
warning(_("reading patches from stdin/tty..."));
if (!f) {
error_errno("cannot open mbox %s", file);
goto out;
}
do {
peek = fgetc(f);
if (peek == EOF) {
if (f == stdin)
/* empty stdin is OK */
ret = skip;
else {
fclose(f);
error(_("empty mbox: '%s'"), file);
}
goto out;
}
} while (isspace(peek));
ungetc(peek, f);
if (strbuf_getwholeline(&buf, f, '\n')) {
/* empty stdin is OK */
if (f != stdin) {
error("cannot read mbox %s", file);
goto out;
}
file_done = 1;
}
while (!file_done) {
char *name = xstrfmt("%s/%0*d", dir, nr_prec, ++skip);
file_done = split_one(f, name, allow_bare);
free(name);
}
if (f != stdin)
fclose(f);
ret = skip;
out:
return ret;
}
int cmd_mailsplit(int argc, const char **argv, const char *prefix)
{
int nr = 0, nr_prec = 4, num = 0;
int allow_bare = 0;
const char *dir = NULL;
const char **argp;
static const char *stdin_only[] = { "-", NULL };
for (argp = argv+1; *argp; argp++) {
const char *arg = *argp;
if (arg[0] != '-')
break;
/* do flags here */
if ( arg[1] == 'd' ) {
nr_prec = strtol(arg+2, NULL, 10);
if (nr_prec < 3 || 10 <= nr_prec)
usage(git_mailsplit_usage);
continue;
} else if ( arg[1] == 'f' ) {
nr = strtol(arg+2, NULL, 10);
} else if ( arg[1] == 'h' ) {
usage(git_mailsplit_usage);
} else if ( arg[1] == 'b' && !arg[2] ) {
allow_bare = 1;
} else if (!strcmp(arg, "--keep-cr")) {
keep_cr = 1;
} else if ( arg[1] == 'o' && arg[2] ) {
dir = arg+2;
} else if (!strcmp(arg, "--mboxrd")) {
mboxrd = 1;
} else if ( arg[1] == '-' && !arg[2] ) {
argp++; /* -- marks end of options */
break;
} else {
die("unknown option: %s", arg);
}
}
if ( !dir ) {
/* Backwards compatibility: if no -o specified, accept
<mbox> <dir> or just <dir> */
switch (argc - (argp-argv)) {
case 1:
dir = argp[0];
argp = stdin_only;
break;
case 2:
stdin_only[0] = argp[0];
dir = argp[1];
argp = stdin_only;
break;
default:
usage(git_mailsplit_usage);
}
} else {
/* New usage: if no more argument, parse stdin */
if ( !*argp )
argp = stdin_only;
}
while (*argp) {
const char *arg = *argp++;
struct stat argstat;
int ret = 0;
if (arg[0] == '-' && arg[1] == 0) {
ret = split_mbox(arg, dir, allow_bare, nr_prec, nr);
if (ret < 0) {
error("cannot split patches from stdin");
return 1;
}
num += (ret - nr);
nr = ret;
continue;
}
if (stat(arg, &argstat) == -1) {
error_errno("cannot stat %s", arg);
return 1;
}
if (S_ISDIR(argstat.st_mode))
ret = split_maildir(arg, dir, nr_prec, nr);
else
ret = split_mbox(arg, dir, allow_bare, nr_prec, nr);
if (ret < 0) {
error("cannot split patches from %s", arg);
return 1;
}
num += (ret - nr);
nr = ret;
}
printf("%d\n", num);
return 0;
}