Merge branch 'tt/help'

[git.git] / xdiff / xemit.c

diff --git a/xdiff/xemit.c b/xdiff/xemit.c
index 2e5d54cfcf6dae715e500df26d1b6dab418fdefc..d3d9c845c6420e4881636d779c7029f900a0b067 100644 (file)
--- a/xdiff/xemit.c
+++ b/xdiff/xemit.c
@@ -69,10 +69,68 @@ static xdchange_t *xdl_get_hunk(xdchange_t *xscr, xdemitconf_t const *xecfg) {
 }
 
 
+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
+        * before the start of the hunk (and context) which starts with a
+        * plausible character.
+        */
+
+       const char *rec;
+       long len;
+
+       while (i-- > 0) {
+               len = xdl_get_rec(xf, i, &rec);
+               if ((*ll = ff(rec, len, buf, sz, ff_priv)) >= 0)
+                       return;
+       }
+       *ll = 0;
+}
+
+
+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;
+
+       for (ix = 0; ix < xdf->nrec; ix++) {
+               if (rchg[ix])
+                       continue;
+               if (xdl_emit_record(xdf, ix, "", ecb))
+                       return -1;
+       }
+       return 0;
+}
+
 int xdl_emit_diff(xdfenv_t *xe, xdchange_t *xscr, xdemitcb_t *ecb,
                  xdemitconf_t const *xecfg) {
        long s1, s2, e1, e2, lctx;
        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);
 
        for (xch = xche = xscr; xch; xch = xche->next) {
                xche = xdl_get_hunk(xch, xecfg);
@@ -90,7 +148,14 @@ int xdl_emit_diff(xdfenv_t *xe, xdchange_t *xscr, xdemitcb_t *ecb,
                /*
                 * Emit current hunk header.
                 */
-               if (xdl_emit_hunk_hdr(s1 + 1, e1 - s1, s2 + 1, e2 - s2, ecb) < 0)
+
+               if (xecfg->flags & XDL_EMIT_FUNCNAMES) {
+                       xdl_find_func(&xe->xdf1, s1, funcbuf,
+                                     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)
                        return -1;
 
                /*
@@ -138,4 +203,3 @@ int xdl_emit_diff(xdfenv_t *xe, xdchange_t *xscr, xdemitcb_t *ecb,
 
        return 0;
 }
-