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-rw-r--r--builtin/mailsplit.c369
1 files changed, 369 insertions, 0 deletions
diff --git a/builtin/mailsplit.c b/builtin/mailsplit.c
new file mode 100644
index 0000000..664400b
--- /dev/null
+++ b/builtin/mailsplit.c
@@ -0,0 +1,369 @@
+/*
+ * 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 = open(name, O_WRONLY | O_CREAT | O_EXCL, 0666);
+ if (fd < 0)
+ die_errno("cannot open output file '%s'", name);
+ 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)) == NULL) {
+ 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 (!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;
+}