index-pack: add a helper function to derive .idx/.keep filename

These are automatically named by replacing .pack suffix in the name of the packfile. Add a small helper to do so, as I'll be adding another one soonish. Signed-off-by: Junio C Hamano <gitster@pobox.com>

Junio C Hamano committed Mar 3, 2016 at 11:29 UTC bfee614a2f5838e03378888d78e8247b8400d5ce
1 file changed +17 -18
builtin/index-pack.c
+17 -18
@@ -1598,6 +1598,18 @@ static void show_pack_info(int stat_only)
1598 }
1599 }
1600
1601 +static const char *derive_filename(const char *pack_name, const char *suffix,
1602 + struct strbuf *buf)
1603 +{
1604 + size_t len;
1605 + if (!strip_suffix(pack_name, ".pack", &len))
1606 + die(_("packfile name '%s' does not end with '.pack'"),
1607 + pack_name);
1608 + strbuf_add(buf, pack_name, len);
1609 + strbuf_addstr(buf, suffix);
1610 + return buf->buf;
1611 +}
1612 +
1613 int cmd_index_pack(int argc, const char **argv, const char *prefix)
1614 {
1615 int i, fix_thin_pack = 0, verify = 0, stat_only = 0;
@@ -1706,24 +1718,11 @@ int cmd_index_pack(int argc, const char **argv, const char *prefix)
1718 usage(index_pack_usage);
1719 if (fix_thin_pack && !from_stdin)
1720 die(_("--fix-thin cannot be used without --stdin"));
1709 - if (!index_name && pack_name) {
1710 - size_t len;
1711 - if (!strip_suffix(pack_name, ".pack", &len))
1712 - die(_("packfile name '%s' does not end with '.pack'"),
1713 - pack_name);
1714 - strbuf_add(&index_name_buf, pack_name, len);
1715 - strbuf_addstr(&index_name_buf, ".idx");
1716 - index_name = index_name_buf.buf;
1717 - }
1718 - if (keep_msg && !keep_name && pack_name) {
1719 - size_t len;
1720 - if (!strip_suffix(pack_name, ".pack", &len))
1721 - die(_("packfile name '%s' does not end with '.pack'"),
1722 - pack_name);
1723 - strbuf_add(&keep_name_buf, pack_name, len);
1724 - strbuf_addstr(&keep_name_buf, ".keep");
1725 - keep_name = keep_name_buf.buf;
1726 - }
1721 + if (!index_name && pack_name)
1722 + index_name = derive_filename(pack_name, ".idx", &index_name_buf);
1723 + if (keep_msg && !keep_name && pack_name)
1724 + keep_name = derive_filename(pack_name, ".keep", &keep_name_buf);
1725 +
1726 if (verify) {
1727 if (!index_name)
1728 die(_("--verify with no packfile name given"));