Make old sha1 optional with git update-ref -d

diff --git a/xdiff/xemit.c b/xdiff/xemit.c
index 78b1d4b8bb6e364e867991de1b57ad02e472e3d6..d3d9c845c6420e4881636d779c7029f900a0b067 100644 (file)
--- a/xdiff/xemit.c
+++ b/xdiff/xemit.c
@@ -69,7 +69,24 @@ static xdchange_t *xdl_get_hunk(xdchange_t *xscr, xdemitconf_t const *xecfg) {
 }
 
 
-static void xdl_find_func(xdfile_t *xf, long i, char *buf, long sz, long *ll) {
+static long def_ff(const char *rec, long len, char *buf, long sz, void *priv)
+{
+       if (len > 0 &&
+                       (isalpha((unsigned char)*rec) || /* identifier? */
+                        *rec == '_' || /* also identifier? */
+                        *rec == '$')) { /* identifiers from VMS and other esoterico */
+               if (len > sz)
+                       len = sz;
+               while (0 < len && isspace((unsigned char)rec[len - 1]))
+                       len--;
+               memcpy(buf, rec, len);
+               return len;
+       }
+       return -1;
+}
+
+static void xdl_find_func(xdfile_t *xf, long i, char *buf, long sz, long *ll,
+               find_func_t ff, void *ff_priv) {
 
        /*
         * Be quite stupid about this for now.  Find a line in the old file
@@ -80,27 +97,17 @@ static void xdl_find_func(xdfile_t *xf, long i, char *buf, long sz, long *ll) {
        const char *rec;
        long len;
 
-       *ll = 0;
        while (i-- > 0) {
                len = xdl_get_rec(xf, i, &rec);
-               if (len > 0 &&
-                   (isalpha((unsigned char)*rec) || /* identifier? */
-                    *rec == '_' ||     /* also identifier? */
-                    *rec == '$')) {    /* mysterious GNU diff's invention */
-                       if (len > sz)
-                               len = sz;
-                       while (0 < len && isspace((unsigned char)rec[len - 1]))
-                               len--;
-                       memcpy(buf, rec, len);
-                       *ll = len;
+               if ((*ll = ff(rec, len, buf, sz, ff_priv)) >= 0)
                        return;
-               }
        }
+       *ll = 0;
 }
 
 
-int xdl_emit_common(xdfenv_t *xe, xdchange_t *xscr, xdemitcb_t *ecb,
-                   xdemitconf_t const *xecfg) {
+static int xdl_emit_common(xdfenv_t *xe, xdchange_t *xscr, xdemitcb_t *ecb,
+                           xdemitconf_t const *xecfg) {
        xdfile_t *xdf = &xe->xdf1;
        const char *rchg = xdf->rchg;
        long ix;
@@ -120,6 +127,7 @@ int xdl_emit_diff(xdfenv_t *xe, xdchange_t *xscr, xdemitcb_t *ecb,
        xdchange_t *xch, *xche;
        char funcbuf[80];
        long funclen = 0;
+       find_func_t ff = xecfg->find_func ?  xecfg->find_func : def_ff;
 
        if (xecfg->flags & XDL_EMIT_COMMON)
                return xdl_emit_common(xe, xscr, ecb, xecfg);
@@ -143,7 +151,8 @@ int xdl_emit_diff(xdfenv_t *xe, xdchange_t *xscr, xdemitcb_t *ecb,
 
                if (xecfg->flags & XDL_EMIT_FUNCNAMES) {
                        xdl_find_func(&xe->xdf1, s1, funcbuf,
-                                     sizeof(funcbuf), &funclen);
+                                     sizeof(funcbuf), &funclen,
+                                     ff, xecfg->find_func_priv);
                }
                if (xdl_emit_hunk_hdr(s1 + 1, e1 - s1, s2 + 1, e2 - s2,
                                      funcbuf, funclen, ecb) < 0)