3 #include "run-command.h"
6 * convert.c - convert a file when checking it out and checking it in.
8 * This should use the pathname to decide on whether it wants to do some
9 * more interesting conversions (automatic gzip/unzip, general format
10 * conversions etc etc), but by default it just does automatic CRLF<->LF
11 * translation when the "auto_crlf" option is set.
14 #define CRLF_GUESS (-1)
20 /* NUL, CR, LF and CRLF counts */
21 unsigned nul, cr, lf, crlf;
23 /* These are just approximations! */
24 unsigned printable, nonprintable;
27 static void gather_stats(const char *buf, unsigned long size, struct text_stat *stats)
31 memset(stats, 0, sizeof(*stats));
33 for (i = 0; i < size; i++) {
34 unsigned char c = buf[i];
37 if (i+1 < size && buf[i+1] == '\n')
47 stats->nonprintable++;
50 /* BS, HT, ESC and FF */
51 case '\b': case '\t': case '\033': case '\014':
58 stats->nonprintable++;
65 /* If file ends with EOF then don't count this EOF as non-printable. */
66 if (size >= 1 && buf[size-1] == '\032')
67 stats->nonprintable--;
71 * The same heuristics as diff.c::mmfile_is_binary()
73 static int is_binary(unsigned long size, struct text_stat *stats)
78 if ((stats->printable >> 7) < stats->nonprintable)
81 * Other heuristics? Average line length might be relevant,
82 * as might LF vs CR vs CRLF counts..
84 * NOTE! It might be normal to have a low ratio of CRLF to LF
85 * (somebody starts with a LF-only file and edits it with an editor
86 * that adds CRLF only to lines that are added..). But do we
87 * want to support CR-only? Probably not.
92 static void check_safe_crlf(const char *path, int action,
93 struct text_stat *stats, enum safe_crlf checksafe)
98 if (action == CRLF_INPUT || auto_crlf <= 0) {
100 * CRLFs would not be restored by checkout:
101 * check if we'd remove CRLFs
104 if (checksafe == SAFE_CRLF_WARN)
105 warning("CRLF will be replaced by LF in %s.", path);
106 else /* i.e. SAFE_CRLF_FAIL */
107 die("CRLF would be replaced by LF in %s.", path);
109 } else if (auto_crlf > 0) {
111 * CRLFs would be added by checkout:
112 * check if we have "naked" LFs
114 if (stats->lf != stats->crlf) {
115 if (checksafe == SAFE_CRLF_WARN)
116 warning("LF will be replaced by CRLF in %s", path);
117 else /* i.e. SAFE_CRLF_FAIL */
118 die("LF would be replaced by CRLF in %s", path);
123 static int has_cr_in_index(const char *path)
127 enum object_type type;
130 struct index_state *istate = &the_index;
133 pos = index_name_pos(istate, path, len);
136 * We might be in the middle of a merge, in which
137 * case we would read stage #2 (ours).
141 (pos < 0 && i < istate->cache_nr &&
142 !strcmp(istate->cache[i]->name, path));
144 if (ce_stage(istate->cache[i]) == 2)
149 data = read_sha1_file(istate->cache[pos]->sha1, &type, &sz);
150 if (!data || type != OBJ_BLOB) {
155 has_cr = memchr(data, '\r', sz) != NULL;
160 static int crlf_to_git(const char *path, const char *src, size_t len,
161 struct strbuf *buf, int action, enum safe_crlf checksafe)
163 struct text_stat stats;
166 if ((action == CRLF_BINARY) || !auto_crlf || !len)
169 gather_stats(src, len, &stats);
171 if (action == CRLF_GUESS) {
173 * We're currently not going to even try to convert stuff
174 * that has bare CR characters. Does anybody do that crazy
177 if (stats.cr != stats.crlf)
181 * And add some heuristics for binary vs text, of course...
183 if (is_binary(len, &stats))
187 * If the file in the index has any CR in it, do not convert.
188 * This is the new safer autocrlf handling.
190 if (has_cr_in_index(path))
194 check_safe_crlf(path, action, &stats, checksafe);
196 /* Optimization: No CR? Nothing to convert, regardless. */
200 /* only grow if not in place */
201 if (strbuf_avail(buf) + buf->len < len)
202 strbuf_grow(buf, len - buf->len);
204 if (action == CRLF_GUESS) {
206 * If we guessed, we already know we rejected a file with
207 * lone CR, and we can strip a CR without looking at what
211 unsigned char c = *src++;
217 unsigned char c = *src++;
218 if (! (c == '\r' && (1 < len && *src == '\n')))
222 strbuf_setlen(buf, dst - buf->buf);
226 static int crlf_to_worktree(const char *path, const char *src, size_t len,
227 struct strbuf *buf, int action)
229 char *to_free = NULL;
230 struct text_stat stats;
232 if ((action == CRLF_BINARY) || (action == CRLF_INPUT) ||
239 gather_stats(src, len, &stats);
241 /* No LF? Nothing to convert, regardless. */
245 /* Was it already in CRLF format? */
246 if (stats.lf == stats.crlf)
249 if (action == CRLF_GUESS) {
250 /* If we have any CR or CRLF line endings, we do not touch it */
251 /* This is the new safer autocrlf-handling */
252 if (stats.cr > 0 || stats.crlf > 0)
255 /* If we have any bare CR characters, we're not going to touch it */
256 if (stats.cr != stats.crlf)
259 if (is_binary(len, &stats))
263 /* are we "faking" in place editing ? */
265 to_free = strbuf_detach(buf, NULL);
267 strbuf_grow(buf, len + stats.lf - stats.crlf);
269 const char *nl = memchr(src, '\n', len);
272 if (nl > src && nl[-1] == '\r') {
273 strbuf_add(buf, src, nl + 1 - src);
275 strbuf_add(buf, src, nl - src);
276 strbuf_addstr(buf, "\r\n");
281 strbuf_add(buf, src, len);
287 struct filter_params {
293 static int filter_buffer(int fd, void *data)
296 * Spawn cmd and feed the buffer contents through its stdin.
298 struct child_process child_process;
299 struct filter_params *params = (struct filter_params *)data;
300 int write_err, status;
301 const char *argv[] = { params->cmd, NULL };
303 memset(&child_process, 0, sizeof(child_process));
304 child_process.argv = argv;
305 child_process.use_shell = 1;
306 child_process.in = -1;
307 child_process.out = fd;
309 if (start_command(&child_process))
310 return error("cannot fork to run external filter %s", params->cmd);
312 write_err = (write_in_full(child_process.in, params->src, params->size) < 0);
313 if (close(child_process.in))
316 error("cannot feed the input to external filter %s", params->cmd);
318 status = finish_command(&child_process);
320 error("external filter %s failed %d", params->cmd, status);
321 return (write_err || status);
324 static int apply_filter(const char *path, const char *src, size_t len,
325 struct strbuf *dst, const char *cmd)
328 * Create a pipeline to have the command filter the buffer's
331 * (child --> cmd) --> us
334 struct strbuf nbuf = STRBUF_INIT;
336 struct filter_params params;
341 memset(&async, 0, sizeof(async));
342 async.proc = filter_buffer;
343 async.data = ¶ms;
349 if (start_async(&async))
350 return 0; /* error was already reported */
352 if (strbuf_read(&nbuf, async.out, len) < 0) {
353 error("read from external filter %s failed", cmd);
356 if (close(async.out)) {
357 error("read from external filter %s failed", cmd);
360 if (finish_async(&async)) {
361 error("external filter %s failed", cmd);
366 strbuf_swap(dst, &nbuf);
368 strbuf_release(&nbuf);
372 static struct convert_driver {
374 struct convert_driver *next;
377 } *user_convert, **user_convert_tail;
379 static int read_convert_config(const char *var, const char *value, void *cb)
381 const char *ep, *name;
383 struct convert_driver *drv;
386 * External conversion drivers are configured using
387 * "filter.<name>.variable".
389 if (prefixcmp(var, "filter.") || (ep = strrchr(var, '.')) == var + 6)
393 for (drv = user_convert; drv; drv = drv->next)
394 if (!strncmp(drv->name, name, namelen) && !drv->name[namelen])
397 drv = xcalloc(1, sizeof(struct convert_driver));
398 drv->name = xmemdupz(name, namelen);
399 *user_convert_tail = drv;
400 user_convert_tail = &(drv->next);
406 * filter.<name>.smudge and filter.<name>.clean specifies
411 * The command-line will not be interpolated in any way.
414 if (!strcmp("smudge", ep))
415 return git_config_string(&drv->smudge, var, value);
417 if (!strcmp("clean", ep))
418 return git_config_string(&drv->clean, var, value);
423 static void setup_convert_check(struct git_attr_check *check)
425 static struct git_attr *attr_crlf;
426 static struct git_attr *attr_ident;
427 static struct git_attr *attr_filter;
430 attr_crlf = git_attr("crlf");
431 attr_ident = git_attr("ident");
432 attr_filter = git_attr("filter");
433 user_convert_tail = &user_convert;
434 git_config(read_convert_config, NULL);
436 check[0].attr = attr_crlf;
437 check[1].attr = attr_ident;
438 check[2].attr = attr_filter;
441 static int count_ident(const char *cp, unsigned long size)
444 * "$Id: 0000000000000000000000000000000000000000 $" <=> "$Id$"
456 if (memcmp("Id", cp, 2))
467 * "$Id: ... "; scan up to the closing dollar sign and discard.
481 static int ident_to_git(const char *path, const char *src, size_t len,
482 struct strbuf *buf, int ident)
486 if (!ident || !count_ident(src, len))
489 /* only grow if not in place */
490 if (strbuf_avail(buf) + buf->len < len)
491 strbuf_grow(buf, len - buf->len);
494 dollar = memchr(src, '$', len);
497 memcpy(dst, src, dollar + 1 - src);
498 dst += dollar + 1 - src;
499 len -= dollar + 1 - src;
502 if (len > 3 && !memcmp(src, "Id:", 3)) {
503 dollar = memchr(src + 3, '$', len - 3);
506 memcpy(dst, "Id$", 3);
508 len -= dollar + 1 - src;
512 memcpy(dst, src, len);
513 strbuf_setlen(buf, dst + len - buf->buf);
517 static int ident_to_worktree(const char *path, const char *src, size_t len,
518 struct strbuf *buf, int ident)
520 unsigned char sha1[20];
521 char *to_free = NULL, *dollar;
527 cnt = count_ident(src, len);
531 /* are we "faking" in place editing ? */
533 to_free = strbuf_detach(buf, NULL);
534 hash_sha1_file(src, len, "blob", sha1);
536 strbuf_grow(buf, len + cnt * 43);
538 /* step 1: run to the next '$' */
539 dollar = memchr(src, '$', len);
542 strbuf_add(buf, src, dollar + 1 - src);
543 len -= dollar + 1 - src;
546 /* step 2: does it looks like a bit like Id:xxx$ or Id$ ? */
547 if (len < 3 || memcmp("Id", src, 2))
550 /* step 3: skip over Id$ or Id:xxxxx$ */
554 } else if (src[2] == ':') {
556 * It's possible that an expanded Id has crept its way into the
557 * repository, we cope with that by stripping the expansion out
559 dollar = memchr(src + 3, '$', len - 3);
561 /* incomplete keyword, no more '$', so just quit the loop */
565 len -= dollar + 1 - src;
568 /* it wasn't a "Id$" or "Id:xxxx$" */
572 /* step 4: substitute */
573 strbuf_addstr(buf, "Id: ");
574 strbuf_add(buf, sha1_to_hex(sha1), 40);
575 strbuf_addstr(buf, " $");
577 strbuf_add(buf, src, len);
583 static int git_path_check_crlf(const char *path, struct git_attr_check *check)
585 const char *value = check->value;
587 if (ATTR_TRUE(value))
589 else if (ATTR_FALSE(value))
591 else if (ATTR_UNSET(value))
593 else if (!strcmp(value, "input"))
598 static struct convert_driver *git_path_check_convert(const char *path,
599 struct git_attr_check *check)
601 const char *value = check->value;
602 struct convert_driver *drv;
604 if (ATTR_TRUE(value) || ATTR_FALSE(value) || ATTR_UNSET(value))
606 for (drv = user_convert; drv; drv = drv->next)
607 if (!strcmp(value, drv->name))
612 static int git_path_check_ident(const char *path, struct git_attr_check *check)
614 const char *value = check->value;
616 return !!ATTR_TRUE(value);
619 int convert_to_git(const char *path, const char *src, size_t len,
620 struct strbuf *dst, enum safe_crlf checksafe)
622 struct git_attr_check check[3];
623 int crlf = CRLF_GUESS;
624 int ident = 0, ret = 0;
625 const char *filter = NULL;
627 setup_convert_check(check);
628 if (!git_checkattr(path, ARRAY_SIZE(check), check)) {
629 struct convert_driver *drv;
630 crlf = git_path_check_crlf(path, check + 0);
631 ident = git_path_check_ident(path, check + 1);
632 drv = git_path_check_convert(path, check + 2);
633 if (drv && drv->clean)
637 ret |= apply_filter(path, src, len, dst, filter);
642 ret |= crlf_to_git(path, src, len, dst, crlf, checksafe);
647 return ret | ident_to_git(path, src, len, dst, ident);
650 int convert_to_working_tree(const char *path, const char *src, size_t len, struct strbuf *dst)
652 struct git_attr_check check[3];
653 int crlf = CRLF_GUESS;
654 int ident = 0, ret = 0;
655 const char *filter = NULL;
657 setup_convert_check(check);
658 if (!git_checkattr(path, ARRAY_SIZE(check), check)) {
659 struct convert_driver *drv;
660 crlf = git_path_check_crlf(path, check + 0);
661 ident = git_path_check_ident(path, check + 1);
662 drv = git_path_check_convert(path, check + 2);
663 if (drv && drv->smudge)
664 filter = drv->smudge;
667 ret |= ident_to_worktree(path, src, len, dst, ident);
672 ret |= crlf_to_worktree(path, src, len, dst, crlf);
677 return ret | apply_filter(path, src, len, dst, filter);