efficient incremental search

1 files changed, 19 insertions, 18 deletions

diff --git a/dmenu.c b/dmenu.c
index d0ed966..a8a6290 100644
--- a/dmenu.c
+++ b/dmenu.c
@@ -27,9 +27,9 @@ static void calcoffsets(void);
 static void drawmenu(void);
 static char *fstrstr(const char *s, const char *sub);
 static void grabkeyboard(void);
-static void insert(const char *s, ssize_t n);
+static void insert(const char *str, ssize_t n);
 static void keypress(XKeyEvent *ev);
-static void match(void);
+static void match(Bool sub);
 static size_t nextrune(int incr);
 static void paste(void);
 static void readstdin(void);
@@ -218,14 +218,14 @@ grabkeyboard(void) {
 }
 
 void
-insert(const char *s, ssize_t n) {
+insert(const char *str, ssize_t n) {
         if(strlen(text) + n > sizeof text - 1)
                 return;
         memmove(&text[cursor + n], &text[cursor], sizeof text - cursor - MAX(n, 0));
         if(n > 0)
-                memcpy(&text[cursor], s, n);
+                memcpy(&text[cursor], str, n);
         cursor += n;
-        match();
+        match(n > 0);
 }
 
 void
@@ -269,7 +269,7 @@ keypress(XKeyEvent *ev) {
                         break;
                 case XK_k:  /* delete right */
                         text[cursor] = '\0';
-                        match();
+                        match(False);
                         break;
                 case XK_n:
                         ksym = XK_Down;
@@ -375,30 +375,31 @@ keypress(XKeyEvent *ev) {
                         return;
                 strncpy(text, sel->text, sizeof text);
                 cursor = strlen(text);
-                match();
+                match(True);
                 break;
         }
         drawmenu();
 }
 
 void
-match(void) {
+match(Bool sub) {
         size_t len = strlen(text);
-        Item *item, *lexact, *lprefix, *lsubstr, *exactend, *prefixend, *substrend;
+        Item *lexact, *lprefix, *lsubstr, *exactend, *prefixend, *substrend;
+        Item *item, *next = NULL;
 
-        matches = lexact = lprefix = lsubstr = matchend = exactend = prefixend = substrend = NULL;
-        for(item = items; item && item->text; item++)
+        lexact = lprefix = lsubstr = exactend = prefixend = substrend = NULL;
+        for(item = sub ? matches : items; item && item->text; item = next) {
+                next = sub ? item->right : item + 1;
                 if(!fstrncmp(text, item->text, len + 1))
                         appenditem(item, &lexact, &exactend);
                 else if(!fstrncmp(text, item->text, len))
                         appenditem(item, &lprefix, &prefixend);
                 else if(fstrstr(item->text, text))
                         appenditem(item, &lsubstr, &substrend);
-
-        if(lexact) {
-                matches = lexact;
-                matchend = exactend;
         }
+        matches = lexact;
+        matchend = exactend;
+
         if(lprefix) {
                 if(matchend) {
                         matchend->right = lprefix;
@@ -498,8 +499,8 @@ setup(void) {
 
         normcol[ColBG] = getcolor(dc, normbgcolor);
         normcol[ColFG] = getcolor(dc, normfgcolor);
-        selcol[ColBG] = getcolor(dc, selbgcolor);
-        selcol[ColFG] = getcolor(dc, selfgcolor);
+        selcol[ColBG]  = getcolor(dc, selbgcolor);
+        selcol[ColFG]  = getcolor(dc, selfgcolor);
 
         utf8 = XInternAtom(dc->dpy, "UTF8_STRING", False);
 
@@ -532,7 +533,7 @@ setup(void) {
         }
         inputw = MIN(inputw, mw/3);
         promptw = prompt ? textw(dc, prompt) : 0;
-        match();
+        match(False);
 
         /* menu window */
         wa.override_redirect = True;