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git-fetch: rewrite expand_ref_wildcard in C
This does not seem to make measurable improvement when dealing with 1000 unpacked refs, but we would need something like it if we were to do a full rewrite in C somedaoy. Signed-off-by: Junio C Hamano <junkio@cox.net>
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@ -323,6 +323,91 @@ static int parse_reflist(const char *reflist)
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return 0;
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}
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static int expand_refs_wildcard(const char *ls_remote_result, int numrefs,
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const char **refs)
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{
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int i, matchlen, replacelen;
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int found_one = 0;
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const char *remote = *refs++;
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numrefs--;
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if (numrefs == 0) {
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fprintf(stderr, "Nothing specified for fetching with remote.%s.fetch\n",
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remote);
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printf("empty\n");
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}
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for (i = 0; i < numrefs; i++) {
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const char *ref = refs[i];
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const char *lref = ref;
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const char *colon;
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const char *tail;
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const char *ls;
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const char *next;
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if (*lref == '+')
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lref++;
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colon = strchr(lref, ':');
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tail = lref + strlen(lref);
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if (!(colon &&
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2 < colon - lref &&
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colon[-1] == '*' &&
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colon[-2] == '/' &&
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2 < tail - (colon + 1) &&
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tail[-1] == '*' &&
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tail[-2] == '/')) {
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/* not a glob */
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if (!found_one++)
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printf("explicit\n");
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printf("%s\n", ref);
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continue;
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}
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/* glob */
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if (!found_one++)
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printf("glob\n");
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/* lref to colon-2 is remote hierarchy name;
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* colon+1 to tail-2 is local.
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*/
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matchlen = (colon-1) - lref;
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replacelen = (tail-1) - (colon+1);
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for (ls = ls_remote_result; ls; ls = next) {
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const char *eol;
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unsigned char sha1[20];
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int namelen;
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while (*ls && isspace(*ls))
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ls++;
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next = strchr(ls, '\n');
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eol = !next ? (ls + strlen(ls)) : next;
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if (!memcmp("^{}", eol-3, 3))
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continue;
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if (get_sha1_hex(ls, sha1))
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continue;
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ls += 40;
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while (ls < eol && isspace(*ls))
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ls++;
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/* ls to next (or eol) is the name.
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* is it identical to lref to colon-2?
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*/
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if ((eol - ls) <= matchlen ||
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strncmp(ls, lref, matchlen))
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continue;
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/* Yes, it is a match */
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namelen = eol - ls;
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if (lref != ref)
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putchar('+');
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printf("%.*s:%.*s%.*s\n",
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namelen, ls,
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replacelen, colon + 1,
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namelen - matchlen, ls + matchlen);
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}
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}
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return 0;
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}
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int cmd_fetch__tool(int argc, const char **argv, const char *prefix)
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{
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int verbose = 0;
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@ -380,6 +465,11 @@ int cmd_fetch__tool(int argc, const char **argv, const char *prefix)
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return error("parse-reflist takes 1 arg");
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return parse_reflist(argv[2]);
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}
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if (!strcmp("expand-refs-wildcard", argv[1])) {
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if (argc < 4)
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return error("expand-refs-wildcard takes at least 2 args");
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return expand_refs_wildcard(argv[2], argc - 3, argv + 3);
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}
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return error("Unknown subcommand: %s", argv[1]);
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}
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@ -81,51 +81,7 @@ get_remote_default_refs_for_push () {
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# is to help prevent randomly "globbed" ref from being chosen as
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# a merge candidate
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expand_refs_wildcard () {
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remote="$1"
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shift
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first_one=yes
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if test "$#" = 0
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then
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echo empty
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echo >&2 "Nothing specified for fetching with remote.$remote.fetch"
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fi
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for ref
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do
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lref=${ref#'+'}
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# a non glob pattern is given back as-is.
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expr "z$lref" : 'zrefs/.*/\*:refs/.*/\*$' >/dev/null || {
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if test -n "$first_one"
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then
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echo "explicit"
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first_one=
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fi
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echo "$ref"
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continue
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}
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# glob
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if test -n "$first_one"
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then
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echo "glob"
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first_one=
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fi
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from=`expr "z$lref" : 'z\(refs/.*/\)\*:refs/.*/\*$'`
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to=`expr "z$lref" : 'zrefs/.*/\*:\(refs/.*/\)\*$'`
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local_force=
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test "z$lref" = "z$ref" || local_force='+'
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echo "$ls_remote_result" |
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sed -e '/\^{}$/d' |
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(
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IFS=' '
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while read sha1 name
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do
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# ignore the ones that do not start with $from
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mapped=${name#"$from"}
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test "z$name" = "z$mapped" && continue
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echo "${local_force}${name}:${to}${mapped}"
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done
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)
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done
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git fetch--tool expand-refs-wildcard "$ls_remote_result" "$@"
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}
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# Subroutine to canonicalize remote:local notation.
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