mailsplit: fix for more than one input files
[git/git.git] / builtin-mailsplit.c
CommitLineData
2744b234
LT
1/*
2 * Totally braindamaged mbox splitter program.
3 *
4 * It just splits a mbox into a list of files: "0001" "0002" ..
5 * so you can process them further from there.
6 */
8b73edf4 7#include "cache.h"
e690e843 8#include "builtin.h"
d63bd9a2 9#include "path-list.h"
2744b234 10
8b73edf4 11static const char git_mailsplit_usage[] =
d63bd9a2 12"git-mailsplit [-d<prec>] [-f<n>] [-b] -o<directory> <mbox>|<Maildir>...";
2744b234
LT
13
14static int is_from_line(const char *line, int len)
15{
16 const char *colon;
17
18 if (len < 20 || memcmp("From ", line, 5))
19 return 0;
20
21 colon = line + len - 2;
22 line += 5;
23 for (;;) {
24 if (colon < line)
25 return 0;
26 if (*--colon == ':')
27 break;
28 }
29
30 if (!isdigit(colon[-4]) ||
31 !isdigit(colon[-2]) ||
32 !isdigit(colon[-1]) ||
33 !isdigit(colon[ 1]) ||
34 !isdigit(colon[ 2]))
35 return 0;
36
37 /* year */
38 if (strtol(colon+3, NULL, 10) <= 90)
39 return 0;
40
41 /* Ok, close enough */
42 return 1;
43}
44
8b73edf4
JH
45/* Could be as small as 64, enough to hold a Unix "From " line. */
46static char buf[4096];
47
48/* Called with the first line (potentially partial)
49 * already in buf[] -- normally that should begin with
50 * the Unix "From " line. Write it into the specified
51 * file.
52 */
b3f041fb 53static int split_one(FILE *mbox, const char *name, int allow_bare)
2744b234 54{
8b73edf4
JH
55 FILE *output = NULL;
56 int len = strlen(buf);
57 int fd;
58 int status = 0;
b3f041fb 59 int is_bare = !is_from_line(buf, len);
2744b234 60
b3f041fb 61 if (is_bare && !allow_bare)
2744b234
LT
62 goto corrupt;
63
8b73edf4
JH
64 fd = open(name, O_WRONLY | O_CREAT | O_EXCL, 0666);
65 if (fd < 0)
66 die("cannot open output file %s", name);
67 output = fdopen(fd, "w");
2744b234 68
8b73edf4
JH
69 /* Copy it out, while searching for a line that begins with
70 * "From " and having something that looks like a date format.
2744b234 71 */
8b73edf4
JH
72 for (;;) {
73 int is_partial = (buf[len-1] != '\n');
74
75 if (fputs(buf, output) == EOF)
76 die("cannot write output");
77
78 if (fgets(buf, sizeof(buf), mbox) == NULL) {
79 if (feof(mbox)) {
80 status = 1;
81 break;
82 }
83 die("cannot read mbox");
84 }
85 len = strlen(buf);
b3f041fb 86 if (!is_partial && !is_bare && is_from_line(buf, len))
8b73edf4
JH
87 break; /* done with one message */
88 }
89 fclose(output);
90 return status;
91
92 corrupt:
93 if (output)
94 fclose(output);
95 unlink(name);
2744b234
LT
96 fprintf(stderr, "corrupt mailbox\n");
97 exit(1);
98}
99
d63bd9a2 100static int populate_maildir_list(struct path_list *list, const char *path)
2744b234 101{
d63bd9a2
FP
102 DIR *dir;
103 struct dirent *dent;
104
105 if ((dir = opendir(path)) == NULL) {
106 error("cannot opendir %s (%s)", path, strerror(errno));
107 return -1;
108 }
109
110 while ((dent = readdir(dir)) != NULL) {
111 if (dent->d_name[0] == '.')
112 continue;
113 path_list_insert(dent->d_name, list);
114 }
115
116 closedir(dir);
117
118 return 0;
119}
120
121static int split_maildir(const char *maildir, const char *dir,
122 int nr_prec, int skip)
123{
124 char file[PATH_MAX];
125 char curdir[PATH_MAX];
126 char name[PATH_MAX];
e690e843 127 int ret = -1;
d63bd9a2
FP
128 int i;
129 struct path_list list = {NULL, 0, 0, 1};
e690e843 130
d63bd9a2
FP
131 snprintf(curdir, sizeof(curdir), "%s/cur", maildir);
132 if (populate_maildir_list(&list, curdir) < 0)
133 goto out;
e690e843 134
d63bd9a2
FP
135 for (i = 0; i < list.nr; i++) {
136 FILE *f;
137 snprintf(file, sizeof(file), "%s/%s", curdir, list.items[i].path);
138 f = fopen(file, "r");
139 if (!f) {
140 error("cannot open mail %s (%s)", file, strerror(errno));
e690e843
LS
141 goto out;
142 }
143
144 if (fgets(buf, sizeof(buf), f) == NULL) {
d63bd9a2 145 error("cannot read mail %s (%s)", file, strerror(errno));
e690e843
LS
146 goto out;
147 }
148
d63bd9a2
FP
149 sprintf(name, "%s/%0*d", dir, nr_prec, ++skip);
150 split_one(f, name, 1);
151
152 fclose(f);
153 }
154
155 path_list_clear(&list, 1);
156
157 ret = skip;
158out:
159 return ret;
160}
161
162int split_mbox(const char *file, const char *dir, int allow_bare,
163 int nr_prec, int skip)
164{
165 char name[PATH_MAX];
166 int ret = -1;
167
168 FILE *f = !strcmp(file, "-") ? stdin : fopen(file, "r");
169 int file_done = 0;
170
171 if (!f) {
172 error("cannot open mbox %s", file);
173 goto out;
174 }
175
176 if (fgets(buf, sizeof(buf), f) == NULL) {
177 /* empty stdin is OK */
178 if (f != stdin) {
179 error("cannot read mbox %s", file);
180 goto out;
e690e843 181 }
d63bd9a2
FP
182 file_done = 1;
183 }
e690e843 184
d63bd9a2
FP
185 while (!file_done) {
186 sprintf(name, "%s/%0*d", dir, nr_prec, ++skip);
187 file_done = split_one(f, name, allow_bare);
e690e843 188 }
d63bd9a2
FP
189
190 if (f != stdin)
191 fclose(f);
192
e690e843
LS
193 ret = skip;
194out:
e690e843
LS
195 return ret;
196}
d63bd9a2 197
a633fca0 198int cmd_mailsplit(int argc, const char **argv, const char *prefix)
e690e843 199{
d63bd9a2 200 int nr = 0, nr_prec = 4, num = 0;
b3f041fb
PA
201 int allow_bare = 0;
202 const char *dir = NULL;
203 const char **argp;
204 static const char *stdin_only[] = { "-", NULL };
8b73edf4 205
b3f041fb
PA
206 for (argp = argv+1; *argp; argp++) {
207 const char *arg = *argp;
8b73edf4
JH
208
209 if (arg[0] != '-')
210 break;
211 /* do flags here */
b3f041fb
PA
212 if ( arg[1] == 'd' ) {
213 nr_prec = strtol(arg+2, NULL, 10);
8b73edf4
JH
214 if (nr_prec < 3 || 10 <= nr_prec)
215 usage(git_mailsplit_usage);
216 continue;
b3f041fb
PA
217 } else if ( arg[1] == 'f' ) {
218 nr = strtol(arg+2, NULL, 10);
219 } else if ( arg[1] == 'b' && !arg[2] ) {
220 allow_bare = 1;
221 } else if ( arg[1] == 'o' && arg[2] ) {
222 dir = arg+2;
223 } else if ( arg[1] == '-' && !arg[2] ) {
224 argp++; /* -- marks end of options */
225 break;
226 } else {
227 die("unknown option: %s", arg);
8b73edf4 228 }
2744b234 229 }
8b73edf4 230
b3f041fb
PA
231 if ( !dir ) {
232 /* Backwards compatibility: if no -o specified, accept
233 <mbox> <dir> or just <dir> */
234 switch (argc - (argp-argv)) {
235 case 1:
236 dir = argp[0];
237 argp = stdin_only;
238 break;
239 case 2:
240 stdin_only[0] = argp[0];
241 dir = argp[1];
242 argp = stdin_only;
243 break;
244 default:
245 usage(git_mailsplit_usage);
246 }
247 } else {
248 /* New usage: if no more argument, parse stdin */
249 if ( !*argp )
250 argp = stdin_only;
2744b234 251 }
8b73edf4 252
d63bd9a2
FP
253 while (*argp) {
254 const char *arg = *argp++;
255 struct stat argstat;
256 int ret = 0;
257
258 if (arg[0] == '-' && arg[1] == 0) {
259 ret = split_mbox(arg, dir, allow_bare, nr_prec, nr);
260 if (ret < 0) {
261 error("cannot split patches from stdin");
262 return 1;
263 }
b3327180
JH
264 num += (ret - nr);
265 nr = ret;
d63bd9a2
FP
266 continue;
267 }
268
269 if (stat(arg, &argstat) == -1) {
270 error("cannot stat %s (%s)", arg, strerror(errno));
271 return 1;
272 }
273
274 if (S_ISDIR(argstat.st_mode))
275 ret = split_maildir(arg, dir, nr_prec, nr);
276 else
277 ret = split_mbox(arg, dir, allow_bare, nr_prec, nr);
278
279 if (ret < 0) {
280 error("cannot split patches from %s", arg);
281 return 1;
282 }
b3327180
JH
283 num += (ret - nr);
284 nr = ret;
d63bd9a2
FP
285 }
286
287 printf("%d\n", num);
b3f041fb 288
d63bd9a2 289 return 0;
2744b234 290}