doc: describe git svn init --ignore-refs
[git/git-svn.git] / builtin / mailsplit.c
blob664400b8169b673f735e77f7dd86474f1665a3ae
1 /*
2 * Totally braindamaged mbox splitter program.
4 * It just splits a mbox into a list of files: "0001" "0002" ..
5 * so you can process them further from there.
6 */
7 #include "cache.h"
8 #include "builtin.h"
9 #include "string-list.h"
10 #include "strbuf.h"
12 static const char git_mailsplit_usage[] =
13 "git mailsplit [-d<prec>] [-f<n>] [-b] [--keep-cr] -o<directory> [(<mbox>|<Maildir>)...]";
15 static int is_from_line(const char *line, int len)
17 const char *colon;
19 if (len < 20 || memcmp("From ", line, 5))
20 return 0;
22 colon = line + len - 2;
23 line += 5;
24 for (;;) {
25 if (colon < line)
26 return 0;
27 if (*--colon == ':')
28 break;
31 if (!isdigit(colon[-4]) ||
32 !isdigit(colon[-2]) ||
33 !isdigit(colon[-1]) ||
34 !isdigit(colon[ 1]) ||
35 !isdigit(colon[ 2]))
36 return 0;
38 /* year */
39 if (strtol(colon+3, NULL, 10) <= 90)
40 return 0;
42 /* Ok, close enough */
43 return 1;
46 static struct strbuf buf = STRBUF_INIT;
47 static int keep_cr;
48 static int mboxrd;
50 static int is_gtfrom(const struct strbuf *buf)
52 size_t min = strlen(">From ");
53 size_t ngt;
55 if (buf->len < min)
56 return 0;
58 ngt = strspn(buf->buf, ">");
59 return ngt && starts_with(buf->buf + ngt, "From ");
62 /* Called with the first line (potentially partial)
63 * already in buf[] -- normally that should begin with
64 * the Unix "From " line. Write it into the specified
65 * file.
67 static int split_one(FILE *mbox, const char *name, int allow_bare)
69 FILE *output;
70 int fd;
71 int status = 0;
72 int is_bare = !is_from_line(buf.buf, buf.len);
74 if (is_bare && !allow_bare) {
75 fprintf(stderr, "corrupt mailbox\n");
76 exit(1);
78 fd = open(name, O_WRONLY | O_CREAT | O_EXCL, 0666);
79 if (fd < 0)
80 die_errno("cannot open output file '%s'", name);
81 output = xfdopen(fd, "w");
83 /* Copy it out, while searching for a line that begins with
84 * "From " and having something that looks like a date format.
86 for (;;) {
87 if (!keep_cr && buf.len > 1 && buf.buf[buf.len-1] == '\n' &&
88 buf.buf[buf.len-2] == '\r') {
89 strbuf_setlen(&buf, buf.len-2);
90 strbuf_addch(&buf, '\n');
93 if (mboxrd && is_gtfrom(&buf))
94 strbuf_remove(&buf, 0, 1);
96 if (fwrite(buf.buf, 1, buf.len, output) != buf.len)
97 die_errno("cannot write output");
99 if (strbuf_getwholeline(&buf, mbox, '\n')) {
100 if (feof(mbox)) {
101 status = 1;
102 break;
104 die_errno("cannot read mbox");
106 if (!is_bare && is_from_line(buf.buf, buf.len))
107 break; /* done with one message */
109 fclose(output);
110 return status;
113 static int populate_maildir_list(struct string_list *list, const char *path)
115 DIR *dir;
116 struct dirent *dent;
117 char *name = NULL;
118 char *subs[] = { "cur", "new", NULL };
119 char **sub;
120 int ret = -1;
122 for (sub = subs; *sub; ++sub) {
123 free(name);
124 name = xstrfmt("%s/%s", path, *sub);
125 if ((dir = opendir(name)) == NULL) {
126 if (errno == ENOENT)
127 continue;
128 error_errno("cannot opendir %s", name);
129 goto out;
132 while ((dent = readdir(dir)) != NULL) {
133 if (dent->d_name[0] == '.')
134 continue;
135 free(name);
136 name = xstrfmt("%s/%s", *sub, dent->d_name);
137 string_list_insert(list, name);
140 closedir(dir);
143 ret = 0;
145 out:
146 free(name);
147 return ret;
150 static int maildir_filename_cmp(const char *a, const char *b)
152 while (*a && *b) {
153 if (isdigit(*a) && isdigit(*b)) {
154 long int na, nb;
155 na = strtol(a, (char **)&a, 10);
156 nb = strtol(b, (char **)&b, 10);
157 if (na != nb)
158 return na - nb;
159 /* strtol advanced our pointers */
161 else {
162 if (*a != *b)
163 return (unsigned char)*a - (unsigned char)*b;
164 a++;
165 b++;
168 return (unsigned char)*a - (unsigned char)*b;
171 static int split_maildir(const char *maildir, const char *dir,
172 int nr_prec, int skip)
174 char *file = NULL;
175 FILE *f = NULL;
176 int ret = -1;
177 int i;
178 struct string_list list = STRING_LIST_INIT_DUP;
180 list.cmp = maildir_filename_cmp;
182 if (populate_maildir_list(&list, maildir) < 0)
183 goto out;
185 for (i = 0; i < list.nr; i++) {
186 char *name;
188 free(file);
189 file = xstrfmt("%s/%s", maildir, list.items[i].string);
191 f = fopen(file, "r");
192 if (!f) {
193 error_errno("cannot open mail %s", file);
194 goto out;
197 if (strbuf_getwholeline(&buf, f, '\n')) {
198 error_errno("cannot read mail %s", file);
199 goto out;
202 name = xstrfmt("%s/%0*d", dir, nr_prec, ++skip);
203 split_one(f, name, 1);
204 free(name);
206 fclose(f);
207 f = NULL;
210 ret = skip;
211 out:
212 if (f)
213 fclose(f);
214 free(file);
215 string_list_clear(&list, 1);
216 return ret;
219 static int split_mbox(const char *file, const char *dir, int allow_bare,
220 int nr_prec, int skip)
222 int ret = -1;
223 int peek;
225 FILE *f = !strcmp(file, "-") ? stdin : fopen(file, "r");
226 int file_done = 0;
228 if (!f) {
229 error_errno("cannot open mbox %s", file);
230 goto out;
233 do {
234 peek = fgetc(f);
235 if (peek == EOF) {
236 if (f == stdin)
237 /* empty stdin is OK */
238 ret = skip;
239 else {
240 fclose(f);
241 error(_("empty mbox: '%s'"), file);
243 goto out;
245 } while (isspace(peek));
246 ungetc(peek, f);
248 if (strbuf_getwholeline(&buf, f, '\n')) {
249 /* empty stdin is OK */
250 if (f != stdin) {
251 error("cannot read mbox %s", file);
252 goto out;
254 file_done = 1;
257 while (!file_done) {
258 char *name = xstrfmt("%s/%0*d", dir, nr_prec, ++skip);
259 file_done = split_one(f, name, allow_bare);
260 free(name);
263 if (f != stdin)
264 fclose(f);
266 ret = skip;
267 out:
268 return ret;
271 int cmd_mailsplit(int argc, const char **argv, const char *prefix)
273 int nr = 0, nr_prec = 4, num = 0;
274 int allow_bare = 0;
275 const char *dir = NULL;
276 const char **argp;
277 static const char *stdin_only[] = { "-", NULL };
279 for (argp = argv+1; *argp; argp++) {
280 const char *arg = *argp;
282 if (arg[0] != '-')
283 break;
284 /* do flags here */
285 if ( arg[1] == 'd' ) {
286 nr_prec = strtol(arg+2, NULL, 10);
287 if (nr_prec < 3 || 10 <= nr_prec)
288 usage(git_mailsplit_usage);
289 continue;
290 } else if ( arg[1] == 'f' ) {
291 nr = strtol(arg+2, NULL, 10);
292 } else if ( arg[1] == 'h' ) {
293 usage(git_mailsplit_usage);
294 } else if ( arg[1] == 'b' && !arg[2] ) {
295 allow_bare = 1;
296 } else if (!strcmp(arg, "--keep-cr")) {
297 keep_cr = 1;
298 } else if ( arg[1] == 'o' && arg[2] ) {
299 dir = arg+2;
300 } else if (!strcmp(arg, "--mboxrd")) {
301 mboxrd = 1;
302 } else if ( arg[1] == '-' && !arg[2] ) {
303 argp++; /* -- marks end of options */
304 break;
305 } else {
306 die("unknown option: %s", arg);
310 if ( !dir ) {
311 /* Backwards compatibility: if no -o specified, accept
312 <mbox> <dir> or just <dir> */
313 switch (argc - (argp-argv)) {
314 case 1:
315 dir = argp[0];
316 argp = stdin_only;
317 break;
318 case 2:
319 stdin_only[0] = argp[0];
320 dir = argp[1];
321 argp = stdin_only;
322 break;
323 default:
324 usage(git_mailsplit_usage);
326 } else {
327 /* New usage: if no more argument, parse stdin */
328 if ( !*argp )
329 argp = stdin_only;
332 while (*argp) {
333 const char *arg = *argp++;
334 struct stat argstat;
335 int ret = 0;
337 if (arg[0] == '-' && arg[1] == 0) {
338 ret = split_mbox(arg, dir, allow_bare, nr_prec, nr);
339 if (ret < 0) {
340 error("cannot split patches from stdin");
341 return 1;
343 num += (ret - nr);
344 nr = ret;
345 continue;
348 if (stat(arg, &argstat) == -1) {
349 error_errno("cannot stat %s", arg);
350 return 1;
353 if (S_ISDIR(argstat.st_mode))
354 ret = split_maildir(arg, dir, nr_prec, nr);
355 else
356 ret = split_mbox(arg, dir, allow_bare, nr_prec, nr);
358 if (ret < 0) {
359 error("cannot split patches from %s", arg);
360 return 1;
362 num += (ret - nr);
363 nr = ret;
366 printf("%d\n", num);
368 return 0;