6a16938cb65936fd1df816b149408daa57945c55
[git/git.git] / pathspec.c
1 #include "cache.h"
2 #include "dir.h"
3 #include "pathspec.h"
4
5 /*
6 * Finds which of the given pathspecs match items in the index.
7 *
8 * For each pathspec, sets the corresponding entry in the seen[] array
9 * (which should be specs items long, i.e. the same size as pathspec)
10 * to the nature of the "closest" (i.e. most specific) match found for
11 * that pathspec in the index, if it was a closer type of match than
12 * the existing entry. As an optimization, matching is skipped
13 * altogether if seen[] already only contains non-zero entries.
14 *
15 * If seen[] has not already been written to, it may make sense
16 * to use find_pathspecs_matching_against_index() instead.
17 */
18 void add_pathspec_matches_against_index(const struct pathspec *pathspec,
19 char *seen)
20 {
21 int num_unmatched = 0, i;
22
23 /*
24 * Since we are walking the index as if we were walking the directory,
25 * we have to mark the matched pathspec as seen; otherwise we will
26 * mistakenly think that the user gave a pathspec that did not match
27 * anything.
28 */
29 for (i = 0; i < pathspec->nr; i++)
30 if (!seen[i])
31 num_unmatched++;
32 if (!num_unmatched)
33 return;
34 for (i = 0; i < active_nr; i++) {
35 struct cache_entry *ce = active_cache[i];
36 match_pathspec_depth(pathspec, ce->name, ce_namelen(ce), 0, seen);
37 }
38 }
39
40 /*
41 * Finds which of the given pathspecs match items in the index.
42 *
43 * This is a one-shot wrapper around add_pathspec_matches_against_index()
44 * which allocates, populates, and returns a seen[] array indicating the
45 * nature of the "closest" (i.e. most specific) matches which each of the
46 * given pathspecs achieves against all items in the index.
47 */
48 char *find_pathspecs_matching_against_index(const struct pathspec *pathspec)
49 {
50 char *seen = xcalloc(pathspec->nr, 1);
51 add_pathspec_matches_against_index(pathspec, seen);
52 return seen;
53 }
54
55 /*
56 * Magic pathspec
57 *
58 * Possible future magic semantics include stuff like:
59 *
60 * { PATHSPEC_NOGLOB, '!', "noglob" },
61 * { PATHSPEC_ICASE, '\0', "icase" },
62 * { PATHSPEC_RECURSIVE, '*', "recursive" },
63 * { PATHSPEC_REGEXP, '\0', "regexp" },
64 *
65 */
66
67 static struct pathspec_magic {
68 unsigned bit;
69 char mnemonic; /* this cannot be ':'! */
70 const char *name;
71 } pathspec_magic[] = {
72 { PATHSPEC_FROMTOP, '/', "top" },
73 { PATHSPEC_LITERAL, 0, "literal" },
74 };
75
76 /*
77 * Take an element of a pathspec and check for magic signatures.
78 * Append the result to the prefix. Return the magic bitmap.
79 *
80 * For now, we only parse the syntax and throw out anything other than
81 * "top" magic.
82 *
83 * NEEDSWORK: This needs to be rewritten when we start migrating
84 * get_pathspec() users to use the "struct pathspec" interface. For
85 * example, a pathspec element may be marked as case-insensitive, but
86 * the prefix part must always match literally, and a single stupid
87 * string cannot express such a case.
88 */
89 static unsigned prefix_pathspec(struct pathspec_item *item,
90 unsigned *p_short_magic,
91 const char **raw, unsigned flags,
92 const char *prefix, int prefixlen,
93 const char *elt)
94 {
95 static int literal_global = -1;
96 unsigned magic = 0, short_magic = 0, global_magic = 0;
97 const char *copyfrom = elt, *long_magic_end = NULL;
98 char *match;
99 int i, pathspec_prefix = -1;
100
101 if (literal_global < 0)
102 literal_global = git_env_bool(GIT_LITERAL_PATHSPECS_ENVIRONMENT, 0);
103 if (literal_global)
104 global_magic |= PATHSPEC_LITERAL;
105
106 if (elt[0] != ':') {
107 ; /* nothing to do */
108 } else if (elt[1] == '(') {
109 /* longhand */
110 const char *nextat;
111 for (copyfrom = elt + 2;
112 *copyfrom && *copyfrom != ')';
113 copyfrom = nextat) {
114 size_t len = strcspn(copyfrom, ",)");
115 if (copyfrom[len] == ',')
116 nextat = copyfrom + len + 1;
117 else
118 /* handle ')' and '\0' */
119 nextat = copyfrom + len;
120 if (!len)
121 continue;
122 for (i = 0; i < ARRAY_SIZE(pathspec_magic); i++) {
123 if (strlen(pathspec_magic[i].name) == len &&
124 !strncmp(pathspec_magic[i].name, copyfrom, len)) {
125 magic |= pathspec_magic[i].bit;
126 break;
127 }
128 if (!prefixcmp(copyfrom, "prefix:")) {
129 char *endptr;
130 pathspec_prefix = strtol(copyfrom + 7,
131 &endptr, 10);
132 if (endptr - copyfrom != len)
133 die(_("invalid parameter for pathspec magic 'prefix'"));
134 /* "i" would be wrong, but it does not matter */
135 break;
136 }
137 }
138 if (ARRAY_SIZE(pathspec_magic) <= i)
139 die(_("Invalid pathspec magic '%.*s' in '%s'"),
140 (int) len, copyfrom, elt);
141 }
142 if (*copyfrom != ')')
143 die(_("Missing ')' at the end of pathspec magic in '%s'"), elt);
144 long_magic_end = copyfrom;
145 copyfrom++;
146 } else {
147 /* shorthand */
148 for (copyfrom = elt + 1;
149 *copyfrom && *copyfrom != ':';
150 copyfrom++) {
151 char ch = *copyfrom;
152
153 if (!is_pathspec_magic(ch))
154 break;
155 for (i = 0; i < ARRAY_SIZE(pathspec_magic); i++)
156 if (pathspec_magic[i].mnemonic == ch) {
157 short_magic |= pathspec_magic[i].bit;
158 break;
159 }
160 if (ARRAY_SIZE(pathspec_magic) <= i)
161 die(_("Unimplemented pathspec magic '%c' in '%s'"),
162 ch, elt);
163 }
164 if (*copyfrom == ':')
165 copyfrom++;
166 }
167
168 magic |= short_magic;
169 *p_short_magic = short_magic;
170 magic |= global_magic;
171
172 if (pathspec_prefix >= 0 &&
173 (prefixlen || (prefix && *prefix)))
174 die("BUG: 'prefix' magic is supposed to be used at worktree's root");
175
176 if (pathspec_prefix >= 0) {
177 match = xstrdup(copyfrom);
178 prefixlen = pathspec_prefix;
179 } else if (magic & PATHSPEC_FROMTOP) {
180 match = xstrdup(copyfrom);
181 prefixlen = 0;
182 } else {
183 match = prefix_path_gently(prefix, prefixlen, &prefixlen, copyfrom);
184 if (!match)
185 die(_("%s: '%s' is outside repository"), elt, copyfrom);
186 }
187 *raw = item->match = match;
188 /*
189 * Prefix the pathspec (keep all magic) and assign to
190 * original. Useful for passing to another command.
191 */
192 if (flags & PATHSPEC_PREFIX_ORIGIN) {
193 struct strbuf sb = STRBUF_INIT;
194 const char *start = elt;
195 if (prefixlen && !literal_global) {
196 /* Preserve the actual prefix length of each pattern */
197 if (long_magic_end) {
198 strbuf_add(&sb, start, long_magic_end - start);
199 strbuf_addf(&sb, ",prefix:%d", prefixlen);
200 start = long_magic_end;
201 } else {
202 if (*start == ':')
203 start++;
204 strbuf_addf(&sb, ":(prefix:%d)", prefixlen);
205 }
206 }
207 strbuf_add(&sb, start, copyfrom - start);
208 strbuf_addstr(&sb, match);
209 item->original = strbuf_detach(&sb, NULL);
210 } else
211 item->original = elt;
212 item->len = strlen(item->match);
213 item->prefix = prefixlen;
214
215 if ((flags & PATHSPEC_STRIP_SUBMODULE_SLASH_CHEAP) &&
216 (item->len >= 1 && item->match[item->len - 1] == '/') &&
217 (i = cache_name_pos(item->match, item->len - 1)) >= 0 &&
218 S_ISGITLINK(active_cache[i]->ce_mode)) {
219 item->len--;
220 match[item->len] = '\0';
221 }
222
223 if (flags & PATHSPEC_STRIP_SUBMODULE_SLASH_EXPENSIVE)
224 for (i = 0; i < active_nr; i++) {
225 struct cache_entry *ce = active_cache[i];
226 int ce_len = ce_namelen(ce);
227
228 if (!S_ISGITLINK(ce->ce_mode))
229 continue;
230
231 if (item->len <= ce_len || match[ce_len] != '/' ||
232 memcmp(ce->name, match, ce_len))
233 continue;
234 if (item->len == ce_len + 1) {
235 /* strip trailing slash */
236 item->len--;
237 match[item->len] = '\0';
238 } else
239 die (_("Pathspec '%s' is in submodule '%.*s'"),
240 elt, ce_len, ce->name);
241 }
242
243 if (magic & PATHSPEC_LITERAL)
244 item->nowildcard_len = item->len;
245 else {
246 item->nowildcard_len = simple_length(item->match);
247 if (item->nowildcard_len < prefixlen)
248 item->nowildcard_len = prefixlen;
249 }
250 item->flags = 0;
251 if (item->nowildcard_len < item->len &&
252 item->match[item->nowildcard_len] == '*' &&
253 no_wildcard(item->match + item->nowildcard_len + 1))
254 item->flags |= PATHSPEC_ONESTAR;
255
256 /* sanity checks, pathspec matchers assume these are sane */
257 assert(item->nowildcard_len <= item->len &&
258 item->prefix <= item->len);
259 return magic;
260 }
261
262 static int pathspec_item_cmp(const void *a_, const void *b_)
263 {
264 struct pathspec_item *a, *b;
265
266 a = (struct pathspec_item *)a_;
267 b = (struct pathspec_item *)b_;
268 return strcmp(a->match, b->match);
269 }
270
271 static void NORETURN unsupported_magic(const char *pattern,
272 unsigned magic,
273 unsigned short_magic)
274 {
275 struct strbuf sb = STRBUF_INIT;
276 int i, n;
277 for (n = i = 0; i < ARRAY_SIZE(pathspec_magic); i++) {
278 const struct pathspec_magic *m = pathspec_magic + i;
279 if (!(magic & m->bit))
280 continue;
281 if (sb.len)
282 strbuf_addstr(&sb, " ");
283 if (short_magic & m->bit)
284 strbuf_addf(&sb, "'%c'", m->mnemonic);
285 else
286 strbuf_addf(&sb, "'%s'", m->name);
287 n++;
288 }
289 /*
290 * We may want to substitute "this command" with a command
291 * name. E.g. when add--interactive dies when running
292 * "checkout -p"
293 */
294 die(_("%s: pathspec magic not supported by this command: %s"),
295 pattern, sb.buf);
296 }
297
298 /*
299 * Given command line arguments and a prefix, convert the input to
300 * pathspec. die() if any magic in magic_mask is used.
301 */
302 void parse_pathspec(struct pathspec *pathspec,
303 unsigned magic_mask, unsigned flags,
304 const char *prefix, const char **argv)
305 {
306 struct pathspec_item *item;
307 const char *entry = argv ? *argv : NULL;
308 int i, n, prefixlen;
309
310 memset(pathspec, 0, sizeof(*pathspec));
311
312 if (flags & PATHSPEC_MAXDEPTH_VALID)
313 pathspec->magic |= PATHSPEC_MAXDEPTH;
314
315 /* No arguments, no prefix -> no pathspec */
316 if (!entry && !prefix)
317 return;
318
319 if ((flags & PATHSPEC_PREFER_CWD) &&
320 (flags & PATHSPEC_PREFER_FULL))
321 die("BUG: PATHSPEC_PREFER_CWD and PATHSPEC_PREFER_FULL are incompatible");
322
323 /* No arguments with prefix -> prefix pathspec */
324 if (!entry) {
325 static const char *raw[2];
326
327 if (flags & PATHSPEC_PREFER_FULL)
328 return;
329
330 if (!(flags & PATHSPEC_PREFER_CWD))
331 die("BUG: PATHSPEC_PREFER_CWD requires arguments");
332
333 pathspec->items = item = xmalloc(sizeof(*item));
334 memset(item, 0, sizeof(*item));
335 item->match = prefix;
336 item->original = prefix;
337 item->nowildcard_len = item->len = strlen(prefix);
338 item->prefix = item->len;
339 raw[0] = prefix;
340 raw[1] = NULL;
341 pathspec->nr = 1;
342 pathspec->_raw = raw;
343 return;
344 }
345
346 n = 0;
347 while (argv[n])
348 n++;
349
350 pathspec->nr = n;
351 pathspec->items = item = xmalloc(sizeof(*item) * n);
352 pathspec->_raw = argv;
353 prefixlen = prefix ? strlen(prefix) : 0;
354
355 for (i = 0; i < n; i++) {
356 unsigned short_magic;
357 entry = argv[i];
358
359 item[i].magic = prefix_pathspec(item + i, &short_magic,
360 argv + i, flags,
361 prefix, prefixlen, entry);
362 if (item[i].magic & magic_mask)
363 unsupported_magic(entry,
364 item[i].magic & magic_mask,
365 short_magic);
366
367 if ((flags & PATHSPEC_SYMLINK_LEADING_PATH) &&
368 has_symlink_leading_path(item[i].match, item[i].len)) {
369 die(_("pathspec '%s' is beyond a symbolic link"), entry);
370 }
371
372 if (item[i].nowildcard_len < item[i].len)
373 pathspec->has_wildcard = 1;
374 pathspec->magic |= item[i].magic;
375 }
376
377
378 if (pathspec->magic & PATHSPEC_MAXDEPTH) {
379 if (flags & PATHSPEC_KEEP_ORDER)
380 die("BUG: PATHSPEC_MAXDEPTH_VALID and PATHSPEC_KEEP_ORDER are incompatible");
381 qsort(pathspec->items, pathspec->nr,
382 sizeof(struct pathspec_item), pathspec_item_cmp);
383 }
384 }
385
386 /*
387 * N.B. get_pathspec() is deprecated in favor of the "struct pathspec"
388 * based interface - see pathspec.c:parse_pathspec().
389 *
390 * Arguments:
391 * - prefix - a path relative to the root of the working tree
392 * - pathspec - a list of paths underneath the prefix path
393 *
394 * Iterates over pathspec, prepending each path with prefix,
395 * and return the resulting list.
396 *
397 * If pathspec is empty, return a singleton list containing prefix.
398 *
399 * If pathspec and prefix are both empty, return an empty list.
400 *
401 * This is typically used by built-in commands such as add.c, in order
402 * to normalize argv arguments provided to the built-in into a list of
403 * paths to process, all relative to the root of the working tree.
404 */
405 const char **get_pathspec(const char *prefix, const char **pathspec)
406 {
407 struct pathspec ps;
408 parse_pathspec(&ps,
409 PATHSPEC_ALL_MAGIC &
410 ~(PATHSPEC_FROMTOP | PATHSPEC_LITERAL),
411 PATHSPEC_PREFER_CWD,
412 prefix, pathspec);
413 return ps._raw;
414 }
415
416 void copy_pathspec(struct pathspec *dst, const struct pathspec *src)
417 {
418 *dst = *src;
419 dst->items = xmalloc(sizeof(struct pathspec_item) * dst->nr);
420 memcpy(dst->items, src->items,
421 sizeof(struct pathspec_item) * dst->nr);
422 }
423
424 void free_pathspec(struct pathspec *pathspec)
425 {
426 free(pathspec->items);
427 pathspec->items = NULL;
428 }