pathspec: allow querying for attributes
[git/git.git] / pathspec.c
index b961f00..608511c 100644 (file)
@@ -1,6 +1,7 @@
 #include "cache.h"
 #include "dir.h"
 #include "pathspec.h"
+#include "attr.h"
 
 /*
  * Finds which of the given pathspecs match items in the index.
@@ -72,6 +73,7 @@ static struct pathspec_magic {
        { PATHSPEC_GLOB,    '\0', "glob" },
        { PATHSPEC_ICASE,   '\0', "icase" },
        { PATHSPEC_EXCLUDE,  '!', "exclude" },
+       { PATHSPEC_ATTR,    '\0', "attr" },
 };
 
 static void prefix_magic(struct strbuf *sb, int prefixlen, unsigned magic)
@@ -87,6 +89,72 @@ static void prefix_magic(struct strbuf *sb, int prefixlen, unsigned magic)
        strbuf_addf(sb, ",prefix:%d)", prefixlen);
 }
 
+static void parse_pathspec_attr_match(struct pathspec_item *item, const char *value)
+{
+       struct string_list_item *si;
+       struct string_list list = STRING_LIST_INIT_DUP;
+
+       if (item->attr_check || item->attr_match)
+               die(_("Only one 'attr:' specification is allowed."));
+
+       if (!value || !*value)
+               die(_("attr spec must not be empty"));
+
+       string_list_split(&list, value, ' ', -1);
+       string_list_remove_empty_items(&list, 0);
+
+       item->attr_check = attr_check_alloc();
+       item->attr_match = xcalloc(list.nr, sizeof(struct attr_match));
+
+       for_each_string_list_item(si, &list) {
+               size_t attr_len;
+               char *attr_name;
+               const struct git_attr *a;
+
+               int j = item->attr_match_nr++;
+               const char *attr = si->string;
+               struct attr_match *am = &item->attr_match[j];
+
+               switch (*attr) {
+               case '!':
+                       am->match_mode = MATCH_UNSPECIFIED;
+                       attr++;
+                       attr_len = strlen(attr);
+                       break;
+               case '-':
+                       am->match_mode = MATCH_UNSET;
+                       attr++;
+                       attr_len = strlen(attr);
+                       break;
+               default:
+                       attr_len = strcspn(attr, "=");
+                       if (attr[attr_len] != '=')
+                               am->match_mode = MATCH_SET;
+                       else {
+                               am->match_mode = MATCH_VALUE;
+                               am->value = xstrdup(&attr[attr_len + 1]);
+                               if (strchr(am->value, '\\'))
+                                       die(_("attr spec values must not contain backslashes"));
+                       }
+                       break;
+               }
+
+               attr_name = xmemdupz(attr, attr_len);
+               a = git_attr(attr_name);
+               if (!a)
+                       die(_("invalid attribute name %s"), attr_name);
+
+               attr_check_append(item->attr_check, a);
+
+               free(attr_name);
+       }
+
+       if (item->attr_check->nr != item->attr_match_nr)
+               die("BUG: should have same number of entries");
+
+       string_list_clear(&list, 0);
+}
+
 static inline int get_literal_global(void)
 {
        static int literal = -1;
@@ -164,6 +232,7 @@ static int get_global_magic(int element_magic)
  * returns the position in 'elem' after all magic has been parsed
  */
 static const char *parse_long_magic(unsigned *magic, int *prefix_len,
+                                   struct pathspec_item *item,
                                    const char *elem)
 {
        const char *pos;
@@ -189,6 +258,14 @@ static const char *parse_long_magic(unsigned *magic, int *prefix_len,
                        continue;
                }
 
+               if (starts_with(pos, "attr:")) {
+                       char *attr_body = xmemdupz(pos + 5, len - 5);
+                       parse_pathspec_attr_match(item, attr_body);
+                       *magic |= PATHSPEC_ATTR;
+                       free(attr_body);
+                       continue;
+               }
+
                for (i = 0; i < ARRAY_SIZE(pathspec_magic); i++) {
                        if (strlen(pathspec_magic[i].name) == len &&
                            !strncmp(pathspec_magic[i].name, pos, len)) {
@@ -252,13 +329,14 @@ static const char *parse_short_magic(unsigned *magic, const char *elem)
 }
 
 static const char *parse_element_magic(unsigned *magic, int *prefix_len,
+                                      struct pathspec_item *item,
                                       const char *elem)
 {
        if (elem[0] != ':' || get_literal_global())
                return elem; /* nothing to do */
        else if (elem[1] == '(')
                /* longhand */
-               return parse_long_magic(magic, prefix_len, elem);
+               return parse_long_magic(magic, prefix_len, item, elem);
        else
                /* shorthand */
                return parse_short_magic(magic, elem);
@@ -335,12 +413,17 @@ static void init_pathspec_item(struct pathspec_item *item, unsigned flags,
        char *match;
        int pathspec_prefix = -1;
 
+       item->attr_check = NULL;
+       item->attr_match = NULL;
+       item->attr_match_nr = 0;
+
        /* PATHSPEC_LITERAL_PATH ignores magic */
        if (flags & PATHSPEC_LITERAL_PATH) {
                magic = PATHSPEC_LITERAL;
        } else {
                copyfrom = parse_element_magic(&element_magic,
                                               &pathspec_prefix,
+                                              item,
                                               elt);
                magic |= element_magic;
                magic |= get_global_magic(element_magic);
@@ -565,26 +648,46 @@ void parse_pathspec(struct pathspec *pathspec,
 
 void copy_pathspec(struct pathspec *dst, const struct pathspec *src)
 {
-       int i;
+       int i, j;
 
        *dst = *src;
        ALLOC_ARRAY(dst->items, dst->nr);
        COPY_ARRAY(dst->items, src->items, dst->nr);
 
        for (i = 0; i < dst->nr; i++) {
-               dst->items[i].match = xstrdup(src->items[i].match);
-               dst->items[i].original = xstrdup(src->items[i].original);
+               struct pathspec_item *d = &dst->items[i];
+               struct pathspec_item *s = &src->items[i];
+
+               d->match = xstrdup(s->match);
+               d->original = xstrdup(s->original);
+
+               ALLOC_ARRAY(d->attr_match, d->attr_match_nr);
+               COPY_ARRAY(d->attr_match, s->attr_match, d->attr_match_nr);
+               for (j = 0; j < d->attr_match_nr; j++) {
+                       const char *value = s->attr_match[j].value;
+                       d->attr_match[j].value = xstrdup_or_null(value);
+               }
+
+               d->attr_check = attr_check_dup(s->attr_check);
        }
 }
 
 void clear_pathspec(struct pathspec *pathspec)
 {
-       int i;
+       int i, j;
 
        for (i = 0; i < pathspec->nr; i++) {
                free(pathspec->items[i].match);
                free(pathspec->items[i].original);
+
+               for (j = 0; j < pathspec->items[j].attr_match_nr; j++)
+                       free(pathspec->items[i].attr_match[j].value);
+               free(pathspec->items[i].attr_match);
+
+               if (pathspec->items[i].attr_check)
+                       attr_check_free(pathspec->items[i].attr_check);
        }
+
        free(pathspec->items);
        pathspec->items = NULL;
        pathspec->nr = 0;