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git/pathspec.c

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#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];
ce_path_match(ce, pathspec, 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" },
{ PATHSPEC_EXCLUDE, '!', "exclude" },
};
static void prefix_short_magic(struct strbuf *sb, int prefixlen,
unsigned short_magic)
{
int i;
strbuf_addstr(sb, ":(");
for (i = 0; i < ARRAY_SIZE(pathspec_magic); i++)
if (short_magic & pathspec_magic[i].bit) {
if (sb->buf[sb->len - 1] != '(')
strbuf_addch(sb, ',');
strbuf_addstr(sb, pathspec_magic[i].name);
}
strbuf_addf(sb, ",prefix:%d)", prefixlen);
}
/*
* 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 (flags & PATHSPEC_LITERAL_PATH)
global_magic = 0;
if (elt[0] != ':' || literal_global ||
(flags & PATHSPEC_LITERAL_PATH)) {
; /* 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 (starts_with(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 specified */
if (noglob_global && !(magic & PATHSPEC_GLOB))
global_magic |= PATHSPEC_LITERAL;
/* --glob-pathspec is overridden 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;
if (prefixlen && !literal_global) {
/* Preserve the actual prefix length of each pattern */
if (short_magic)
prefix_short_magic(&sb, prefixlen, short_magic);
else if (long_magic_end) {
strbuf_add(&sb, elt, long_magic_end - elt);
strbuf_addf(&sb, ",prefix:%d)", prefixlen);
} else
strbuf_addf(&sb, ":(prefix:%d)", prefixlen);
}
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_addch(&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, nr_exclude = 0;
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 ((flags & PATHSPEC_LITERAL_PATH) &&
!(magic_mask & PATHSPEC_LITERAL))
item[i].magic |= PATHSPEC_LITERAL;
if (item[i].magic & PATHSPEC_EXCLUDE)
nr_exclude++;
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 (nr_exclude == n)
die(_("There is nothing to exclude from by :(exclude) patterns.\n"
"Perhaps you forgot to add either ':/' or '.' ?"));
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;
}
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