PATCH: 3.1.5 - (Wayne) History search more like 3.0.5

["Bart Schaefer" <schaefer@xxxxxxxxxxxxxxxx>]

Wayne's patch from zsh-workers/4078, updated for 3.1.5.

I'm pretty sure Zefram omitted this one on purpose, but I like it.  It's
so much more intuitive this way.

Index: Src/Zle/zle_hist.c
===================================================================
diff -u -r1.1.1.2 -r1.3
--- zle_hist.c	1998/10/30 15:57:13	1.1.1.2
+++ zle_hist.c	1998/06/13 04:24:15	1.3
@@ -291,73 +291,86 @@
 	feep();
 }
 
+static int histpos, srch_hl, srch_cs = -1;
+static char *srch_str;
+
 /**/
 void
 historysearchbackward(void)
 {
-    int histpos, histmpos, hl = histline;
+    int hl = histline;
     int n = zmult;
     char *s;
 
-    if (!n)
-	return;
-    if (n < 0) {
+    if (zmult < 0) {
 	zmult = -n;
 	historysearchforward();
 	zmult = n;
 	return;
     }
-    for (histpos = histmpos = 0; histpos < ll && !iblank(line[histpos]);
-	histpos++, histmpos++)
-	if(imeta(line[histpos]))
-	    histmpos++;
+    if (hl == curhist || hl != srch_hl || cs != srch_cs || mark != 0
+     || memcmp(srch_str, line, histpos) != 0) {
+	zfree(srch_str, histpos);
+	for (histpos = 0; histpos < ll && !iblank(line[histpos]); histpos++) ;
+	if (histpos < ll)
+	    histpos++;
+	srch_str = zalloc(histpos);
+	memcpy(srch_str, line, histpos);
+    }
     for (;;) {
 	hl--;
 	if (!(s = zle_get_event(hl))) {
 	    feep();
 	    return;
 	}
-	if (metadiffer(s, (char *) line, histpos) < 0 &&
-	    iblank(s[histmpos] == Meta ? s[histmpos+1]^32 : s[histmpos]) &&
-	    metadiffer(s, (char *) line, ll) && !--n)
-	    break;
+	if (metadiffer(s, srch_str, histpos) < 0 &&
+	    metadiffer(s, srch_str, ll)) {
+	    if (--n <= 0)
+		break;
+	}
     }
     zle_goto_hist(hl);
+    srch_hl = hl;
+    srch_cs = cs;
 }
 
 /**/
 void
 historysearchforward(void)
 {
-    int histpos, histmpos, hl = histline;
+    int hl = histline;
     int n = zmult;
     char *s;
 
-    if (!n)
-	return;
-    if (n < 0) {
+    if (zmult < 0) {
 	zmult = -n;
 	historysearchbackward();
 	zmult = n;
 	return;
     }
-    for (histpos = histmpos = 0; histpos < ll && !iblank(line[histpos]);
-	histpos++, histmpos++)
-	if(imeta(line[histpos]))
-	    histmpos++;
+    if (hl == curhist || hl != srch_hl || cs != srch_cs || mark != 0
+     || memcmp(srch_str, line, histpos) != 0) {
+	zfree(srch_str, histpos);
+	for (histpos = 0; histpos < ll && !iblank(line[histpos]); histpos++) ;
+	if (histpos < ll)
+	    histpos++;
+	srch_str = zalloc(histpos);
+	memcpy(srch_str, line, histpos);
+    }
     for (;;) {
 	hl++;
 	if (!(s = zle_get_event(hl))) {
 	    feep();
 	    return;
 	}
-	if (metadiffer(s, (char *) line, histpos) < (histline == curhist) &&
-	    (!s[histmpos] ||
-	     iblank(s[histmpos] == Meta ? s[histmpos+1]^32 : s[histmpos])) &&
-	    metadiffer(s, (char *) line, ll) && !--n)
-	    break;
+	if (metadiffer(s, srch_str, histpos) < (hl == curhist) &&
+	    metadiffer(s, srch_str, ll))
+	    if (--n <= 0)
+		break;
     }
     zle_goto_hist(hl);
+    srch_hl = hl;
+    srch_cs = cs;
 }
 
 /**/
@@ -1030,9 +1043,7 @@
 	feep();
 	return;
     }
-    if (!n)
-	return;
-    if (n < 0) {
+    if (zmult < 0) {
 	n = -n;
 	visrchsense = -visrchsense;
     }
@@ -1078,9 +1089,7 @@
     int n = zmult;
     char *s;
 
-    if (!n)
-	return;
-    if (n < 0) {
+    if (zmult < 0) {
 	zmult = -n;
 	historybeginningsearchforward();
 	zmult = n;
@@ -1114,9 +1123,7 @@
     int n = zmult;
     char *s;
 
-    if (!n)
-	return;
-    if (n < 0) {
+    if (zmult < 0) {
 	zmult = -n;
 	historybeginningsearchbackward();
 	zmult = n;

-- 
Bart Schaefer                                 Brass Lantern Enterprises
http://www.well.com/user/barts              http://www.brasslantern.com