diff options
Diffstat (limited to 'pathspec.c')
| -rw-r--r-- | pathspec.c | 474 |
1 files changed, 474 insertions, 0 deletions
diff --git a/pathspec.c b/pathspec.c new file mode 100644 index 0000000000..ad1a9f5b28 --- /dev/null +++ b/pathspec.c @@ -0,0 +1,474 @@ +#include "cache.h" +#include "dir.h" +#include "pathspec.h" + +/* + * Finds which of the given pathspecs match items in the index. + * + * For each pathspec, sets the corresponding entry in the seen[] array + * (which should be specs items long, i.e. the same size as pathspec) + * to the nature of the "closest" (i.e. most specific) match found for + * that pathspec in the index, if it was a closer type of match than + * the existing entry. As an optimization, matching is skipped + * altogether if seen[] already only contains non-zero entries. + * + * If seen[] has not already been written to, it may make sense + * to use find_pathspecs_matching_against_index() instead. + */ +void add_pathspec_matches_against_index(const struct pathspec *pathspec, + char *seen) +{ + int num_unmatched = 0, i; + + /* + * Since we are walking the index as if we were walking the directory, + * we have to mark the matched pathspec as seen; otherwise we will + * mistakenly think that the user gave a pathspec that did not match + * anything. + */ + for (i = 0; i < pathspec->nr; i++) + if (!seen[i]) + num_unmatched++; + if (!num_unmatched) + return; + for (i = 0; i < active_nr; i++) { + const struct cache_entry *ce = active_cache[i]; + match_pathspec_depth(pathspec, ce->name, ce_namelen(ce), 0, seen); + } +} + +/* + * Finds which of the given pathspecs match items in the index. + * + * This is a one-shot wrapper around add_pathspec_matches_against_index() + * which allocates, populates, and returns a seen[] array indicating the + * nature of the "closest" (i.e. most specific) matches which each of the + * given pathspecs achieves against all items in the index. + */ +char *find_pathspecs_matching_against_index(const struct pathspec *pathspec) +{ + char *seen = xcalloc(pathspec->nr, 1); + add_pathspec_matches_against_index(pathspec, seen); + return seen; +} + +/* + * Magic pathspec + * + * Possible future magic semantics include stuff like: + * + * { PATHSPEC_RECURSIVE, '*', "recursive" }, + * { PATHSPEC_REGEXP, '\0', "regexp" }, + * + */ + +static struct pathspec_magic { + unsigned bit; + char mnemonic; /* this cannot be ':'! */ + const char *name; +} pathspec_magic[] = { + { PATHSPEC_FROMTOP, '/', "top" }, + { PATHSPEC_LITERAL, 0, "literal" }, + { PATHSPEC_GLOB, '\0', "glob" }, + { PATHSPEC_ICASE, '\0', "icase" }, +}; + +/* + * Take an element of a pathspec and check for magic signatures. + * Append the result to the prefix. Return the magic bitmap. + * + * For now, we only parse the syntax and throw out anything other than + * "top" magic. + * + * NEEDSWORK: This needs to be rewritten when we start migrating + * get_pathspec() users to use the "struct pathspec" interface. For + * example, a pathspec element may be marked as case-insensitive, but + * the prefix part must always match literally, and a single stupid + * string cannot express such a case. + */ +static unsigned prefix_pathspec(struct pathspec_item *item, + unsigned *p_short_magic, + const char **raw, unsigned flags, + const char *prefix, int prefixlen, + const char *elt) +{ + static int literal_global = -1; + static int glob_global = -1; + static int noglob_global = -1; + static int icase_global = -1; + unsigned magic = 0, short_magic = 0, global_magic = 0; + const char *copyfrom = elt, *long_magic_end = NULL; + char *match; + int i, pathspec_prefix = -1; + + if (literal_global < 0) + literal_global = git_env_bool(GIT_LITERAL_PATHSPECS_ENVIRONMENT, 0); + if (literal_global) + global_magic |= PATHSPEC_LITERAL; + + if (glob_global < 0) + glob_global = git_env_bool(GIT_GLOB_PATHSPECS_ENVIRONMENT, 0); + if (glob_global) + global_magic |= PATHSPEC_GLOB; + + if (noglob_global < 0) + noglob_global = git_env_bool(GIT_NOGLOB_PATHSPECS_ENVIRONMENT, 0); + + if (glob_global && noglob_global) + die(_("global 'glob' and 'noglob' pathspec settings are incompatible")); + + + if (icase_global < 0) + icase_global = git_env_bool(GIT_ICASE_PATHSPECS_ENVIRONMENT, 0); + if (icase_global) + global_magic |= PATHSPEC_ICASE; + + if ((global_magic & PATHSPEC_LITERAL) && + (global_magic & ~PATHSPEC_LITERAL)) + die(_("global 'literal' pathspec setting is incompatible " + "with all other global pathspec settings")); + + if (elt[0] != ':' || literal_global) { + ; /* nothing to do */ + } else if (elt[1] == '(') { + /* longhand */ + const char *nextat; + for (copyfrom = elt + 2; + *copyfrom && *copyfrom != ')'; + copyfrom = nextat) { + size_t len = strcspn(copyfrom, ",)"); + if (copyfrom[len] == ',') + nextat = copyfrom + len + 1; + else + /* handle ')' and '\0' */ + nextat = copyfrom + len; + if (!len) + continue; + for (i = 0; i < ARRAY_SIZE(pathspec_magic); i++) { + if (strlen(pathspec_magic[i].name) == len && + !strncmp(pathspec_magic[i].name, copyfrom, len)) { + magic |= pathspec_magic[i].bit; + break; + } + if (!prefixcmp(copyfrom, "prefix:")) { + char *endptr; + pathspec_prefix = strtol(copyfrom + 7, + &endptr, 10); + if (endptr - copyfrom != len) + die(_("invalid parameter for pathspec magic 'prefix'")); + /* "i" would be wrong, but it does not matter */ + break; + } + } + if (ARRAY_SIZE(pathspec_magic) <= i) + die(_("Invalid pathspec magic '%.*s' in '%s'"), + (int) len, copyfrom, elt); + } + if (*copyfrom != ')') + die(_("Missing ')' at the end of pathspec magic in '%s'"), elt); + long_magic_end = copyfrom; + copyfrom++; + } else { + /* shorthand */ + for (copyfrom = elt + 1; + *copyfrom && *copyfrom != ':'; + copyfrom++) { + char ch = *copyfrom; + + if (!is_pathspec_magic(ch)) + break; + for (i = 0; i < ARRAY_SIZE(pathspec_magic); i++) + if (pathspec_magic[i].mnemonic == ch) { + short_magic |= pathspec_magic[i].bit; + break; + } + if (ARRAY_SIZE(pathspec_magic) <= i) + die(_("Unimplemented pathspec magic '%c' in '%s'"), + ch, elt); + } + if (*copyfrom == ':') + copyfrom++; + } + + magic |= short_magic; + *p_short_magic = short_magic; + + /* --noglob-pathspec adds :(literal) _unless_ :(glob) is specifed */ + if (noglob_global && !(magic & PATHSPEC_GLOB)) + global_magic |= PATHSPEC_LITERAL; + + /* --glob-pathspec is overriden by :(literal) */ + if ((global_magic & PATHSPEC_GLOB) && (magic & PATHSPEC_LITERAL)) + global_magic &= ~PATHSPEC_GLOB; + + magic |= global_magic; + + if (pathspec_prefix >= 0 && + (prefixlen || (prefix && *prefix))) + die("BUG: 'prefix' magic is supposed to be used at worktree's root"); + + if ((magic & PATHSPEC_LITERAL) && (magic & PATHSPEC_GLOB)) + die(_("%s: 'literal' and 'glob' are incompatible"), elt); + + if (pathspec_prefix >= 0) { + match = xstrdup(copyfrom); + prefixlen = pathspec_prefix; + } else if (magic & PATHSPEC_FROMTOP) { + match = xstrdup(copyfrom); + prefixlen = 0; + } else { + match = prefix_path_gently(prefix, prefixlen, &prefixlen, copyfrom); + if (!match) + die(_("%s: '%s' is outside repository"), elt, copyfrom); + } + *raw = item->match = match; + /* + * Prefix the pathspec (keep all magic) and assign to + * original. Useful for passing to another command. + */ + if (flags & PATHSPEC_PREFIX_ORIGIN) { + struct strbuf sb = STRBUF_INIT; + const char *start = elt; + if (prefixlen && !literal_global) { + /* Preserve the actual prefix length of each pattern */ + if (short_magic) + die("BUG: prefixing on short magic is not supported"); + else if (long_magic_end) { + strbuf_add(&sb, start, long_magic_end - start); + strbuf_addf(&sb, ",prefix:%d", prefixlen); + start = long_magic_end; + } else { + if (*start == ':') + start++; + strbuf_addf(&sb, ":(prefix:%d)", prefixlen); + } + } + strbuf_add(&sb, start, copyfrom - start); + strbuf_addstr(&sb, match); + item->original = strbuf_detach(&sb, NULL); + } else + item->original = elt; + item->len = strlen(item->match); + item->prefix = prefixlen; + + if ((flags & PATHSPEC_STRIP_SUBMODULE_SLASH_CHEAP) && + (item->len >= 1 && item->match[item->len - 1] == '/') && + (i = cache_name_pos(item->match, item->len - 1)) >= 0 && + S_ISGITLINK(active_cache[i]->ce_mode)) { + item->len--; + match[item->len] = '\0'; + } + + if (flags & PATHSPEC_STRIP_SUBMODULE_SLASH_EXPENSIVE) + for (i = 0; i < active_nr; i++) { + struct cache_entry *ce = active_cache[i]; + int ce_len = ce_namelen(ce); + + if (!S_ISGITLINK(ce->ce_mode)) + continue; + + if (item->len <= ce_len || match[ce_len] != '/' || + memcmp(ce->name, match, ce_len)) + continue; + if (item->len == ce_len + 1) { + /* strip trailing slash */ + item->len--; + match[item->len] = '\0'; + } else + die (_("Pathspec '%s' is in submodule '%.*s'"), + elt, ce_len, ce->name); + } + + if (magic & PATHSPEC_LITERAL) + item->nowildcard_len = item->len; + else { + item->nowildcard_len = simple_length(item->match); + if (item->nowildcard_len < prefixlen) + item->nowildcard_len = prefixlen; + } + item->flags = 0; + if (magic & PATHSPEC_GLOB) { + /* + * FIXME: should we enable ONESTAR in _GLOB for + * pattern "* * / * . c"? + */ + } else { + if (item->nowildcard_len < item->len && + item->match[item->nowildcard_len] == '*' && + no_wildcard(item->match + item->nowildcard_len + 1)) + item->flags |= PATHSPEC_ONESTAR; + } + + /* sanity checks, pathspec matchers assume these are sane */ + assert(item->nowildcard_len <= item->len && + item->prefix <= item->len); + return magic; +} + +static int pathspec_item_cmp(const void *a_, const void *b_) +{ + struct pathspec_item *a, *b; + + a = (struct pathspec_item *)a_; + b = (struct pathspec_item *)b_; + return strcmp(a->match, b->match); +} + +static void NORETURN unsupported_magic(const char *pattern, + unsigned magic, + unsigned short_magic) +{ + struct strbuf sb = STRBUF_INIT; + int i, n; + for (n = i = 0; i < ARRAY_SIZE(pathspec_magic); i++) { + const struct pathspec_magic *m = pathspec_magic + i; + if (!(magic & m->bit)) + continue; + if (sb.len) + strbuf_addstr(&sb, " "); + if (short_magic & m->bit) + strbuf_addf(&sb, "'%c'", m->mnemonic); + else + strbuf_addf(&sb, "'%s'", m->name); + n++; + } + /* + * We may want to substitute "this command" with a command + * name. E.g. when add--interactive dies when running + * "checkout -p" + */ + die(_("%s: pathspec magic not supported by this command: %s"), + pattern, sb.buf); +} + +/* + * Given command line arguments and a prefix, convert the input to + * pathspec. die() if any magic in magic_mask is used. + */ +void parse_pathspec(struct pathspec *pathspec, + unsigned magic_mask, unsigned flags, + const char *prefix, const char **argv) +{ + struct pathspec_item *item; + const char *entry = argv ? *argv : NULL; + int i, n, prefixlen; + + memset(pathspec, 0, sizeof(*pathspec)); + + if (flags & PATHSPEC_MAXDEPTH_VALID) + pathspec->magic |= PATHSPEC_MAXDEPTH; + + /* No arguments, no prefix -> no pathspec */ + if (!entry && !prefix) + return; + + if ((flags & PATHSPEC_PREFER_CWD) && + (flags & PATHSPEC_PREFER_FULL)) + die("BUG: PATHSPEC_PREFER_CWD and PATHSPEC_PREFER_FULL are incompatible"); + + /* No arguments with prefix -> prefix pathspec */ + if (!entry) { + static const char *raw[2]; + + if (flags & PATHSPEC_PREFER_FULL) + return; + + if (!(flags & PATHSPEC_PREFER_CWD)) + die("BUG: PATHSPEC_PREFER_CWD requires arguments"); + + pathspec->items = item = xmalloc(sizeof(*item)); + memset(item, 0, sizeof(*item)); + item->match = prefix; + item->original = prefix; + item->nowildcard_len = item->len = strlen(prefix); + item->prefix = item->len; + raw[0] = prefix; + raw[1] = NULL; + pathspec->nr = 1; + pathspec->_raw = raw; + return; + } + + n = 0; + while (argv[n]) + n++; + + pathspec->nr = n; + pathspec->items = item = xmalloc(sizeof(*item) * n); + pathspec->_raw = argv; + prefixlen = prefix ? strlen(prefix) : 0; + + for (i = 0; i < n; i++) { + unsigned short_magic; + entry = argv[i]; + + item[i].magic = prefix_pathspec(item + i, &short_magic, + argv + i, flags, + prefix, prefixlen, entry); + if (item[i].magic & magic_mask) + unsupported_magic(entry, + item[i].magic & magic_mask, + short_magic); + + if ((flags & PATHSPEC_SYMLINK_LEADING_PATH) && + has_symlink_leading_path(item[i].match, item[i].len)) { + die(_("pathspec '%s' is beyond a symbolic link"), entry); + } + + if (item[i].nowildcard_len < item[i].len) + pathspec->has_wildcard = 1; + pathspec->magic |= item[i].magic; + } + + + if (pathspec->magic & PATHSPEC_MAXDEPTH) { + if (flags & PATHSPEC_KEEP_ORDER) + die("BUG: PATHSPEC_MAXDEPTH_VALID and PATHSPEC_KEEP_ORDER are incompatible"); + qsort(pathspec->items, pathspec->nr, + sizeof(struct pathspec_item), pathspec_item_cmp); + } +} + +/* + * N.B. get_pathspec() is deprecated in favor of the "struct pathspec" + * based interface - see pathspec.c:parse_pathspec(). + * + * Arguments: + * - prefix - a path relative to the root of the working tree + * - pathspec - a list of paths underneath the prefix path + * + * Iterates over pathspec, prepending each path with prefix, + * and return the resulting list. + * + * If pathspec is empty, return a singleton list containing prefix. + * + * If pathspec and prefix are both empty, return an empty list. + * + * This is typically used by built-in commands such as add.c, in order + * to normalize argv arguments provided to the built-in into a list of + * paths to process, all relative to the root of the working tree. + */ +const char **get_pathspec(const char *prefix, const char **pathspec) +{ + struct pathspec ps; + parse_pathspec(&ps, + PATHSPEC_ALL_MAGIC & + ~(PATHSPEC_FROMTOP | PATHSPEC_LITERAL), + PATHSPEC_PREFER_CWD, + prefix, pathspec); + return ps._raw; +} + +void copy_pathspec(struct pathspec *dst, const struct pathspec *src) +{ + *dst = *src; + dst->items = xmalloc(sizeof(struct pathspec_item) * dst->nr); + memcpy(dst->items, src->items, + sizeof(struct pathspec_item) * dst->nr); +} + +void free_pathspec(struct pathspec *pathspec) +{ + free(pathspec->items); + pathspec->items = NULL; +} |