git/pathspec.c
Nguyễn Thái Ngọc Duy 5a76aff1a6 add: convert to use parse_pathspec
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-07-15 10:56:08 -07:00

375 lines
10 KiB
C

#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 char **pathspec,
char *seen, int specs)
{
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 < specs; i++)
if (!seen[i])
num_unmatched++;
if (!num_unmatched)
return;
for (i = 0; i < active_nr; i++) {
struct cache_entry *ce = active_cache[i];
match_pathspec(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 char **pathspec)
{
char *seen;
int i;
for (i = 0; pathspec[i]; i++)
; /* just counting */
seen = xcalloc(i, 1);
add_pathspec_matches_against_index(pathspec, seen, i);
return seen;
}
/*
* Magic pathspec
*
* Possible future magic semantics include stuff like:
*
* { PATHSPEC_NOGLOB, '!', "noglob" },
* { PATHSPEC_ICASE, '\0', "icase" },
* { 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" },
};
/*
* 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)
{
unsigned magic = 0, short_magic = 0;
const char *copyfrom = elt;
char *match;
int i;
if (elt[0] != ':') {
; /* 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 (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);
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;
if (magic & PATHSPEC_FROMTOP)
match = xstrdup(copyfrom);
else
match = prefix_path(prefix, prefixlen, 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;
strbuf_add(&sb, elt, copyfrom - elt);
strbuf_addstr(&sb, match);
item->original = strbuf_detach(&sb, NULL);
} else
item->original = elt;
item->len = strlen(item->match);
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 (limit_pathspec_to_literal())
item->nowildcard_len = item->len;
else
item->nowildcard_len = simple_length(item->match);
item->flags = 0;
if (item->nowildcard_len < item->len &&
item->match[item->nowildcard_len] == '*' &&
no_wildcard(item->match + item->nowildcard_len + 1))
item->flags |= PATHSPEC_ONESTAR;
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);
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_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);
}