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164 lines
4.6 KiB
164 lines
4.6 KiB
From 94353eb52055927d9079f3d9e33da1c954abf386 Mon Sep 17 00:00:00 2001
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From: aleks <aleks.stier@icloud.com>
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Date: Wed, 26 Jun 2019 13:25:10 +0200
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Subject: [PATCH] Add support for fuzzy-matching
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---
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config.def.h | 1 +
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config.mk | 2 +-
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dmenu.c | 89 ++++++++++++++++++++++++++++++++++++++++++++++++++++
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3 files changed, 91 insertions(+), 1 deletion(-)
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diff --git a/config.def.h b/config.def.h
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index 1edb647..51612b9 100644
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--- a/config.def.h
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+++ b/config.def.h
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@@ -2,6 +2,7 @@
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/* Default settings; can be overriden by command line. */
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static int topbar = 1; /* -b option; if 0, dmenu appears at bottom */
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+static int fuzzy = 1; /* -F option; if 0, dmenu doesn't use fuzzy matching */
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/* -fn option overrides fonts[0]; default X11 font or font set */
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static const char *fonts[] = {
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"monospace:size=10"
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diff --git a/config.mk b/config.mk
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index 0929b4a..d14309a 100644
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--- a/config.mk
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+++ b/config.mk
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@@ -20,7 +20,7 @@ FREETYPEINC = /usr/include/freetype2
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# includes and libs
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INCS = -I$(X11INC) -I$(FREETYPEINC)
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-LIBS = -L$(X11LIB) -lX11 $(XINERAMALIBS) $(FREETYPELIBS)
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+LIBS = -L$(X11LIB) -lX11 $(XINERAMALIBS) $(FREETYPELIBS) -lm
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# flags
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CPPFLAGS = -D_DEFAULT_SOURCE -D_BSD_SOURCE -D_XOPEN_SOURCE=700 -D_POSIX_C_SOURCE=200809L -DVERSION=\"$(VERSION)\" $(XINERAMAFLAGS)
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diff --git a/dmenu.c b/dmenu.c
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index 6b8f51b..96ddc98 100644
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--- a/dmenu.c
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+++ b/dmenu.c
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@@ -1,6 +1,7 @@
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/* See LICENSE file for copyright and license details. */
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#include <ctype.h>
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#include <locale.h>
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+#include <math.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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@@ -32,6 +33,7 @@ struct item {
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char *text;
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struct item *left, *right;
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int out;
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+ double distance;
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};
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static char text[BUFSIZ] = "";
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@@ -210,9 +212,94 @@ grabkeyboard(void)
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die("cannot grab keyboard");
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}
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+int
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+compare_distance(const void *a, const void *b)
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+{
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+ struct item *da = *(struct item **) a;
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+ struct item *db = *(struct item **) b;
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+
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+ if (!db)
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+ return 1;
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+ if (!da)
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+ return -1;
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+
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+ return da->distance == db->distance ? 0 : da->distance < db->distance ? -1 : 1;
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+}
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+
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+void
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+fuzzymatch(void)
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+{
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+ /* bang - we have so much memory */
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+ struct item *it;
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+ struct item **fuzzymatches = NULL;
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+ char c;
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+ int number_of_matches = 0, i, pidx, sidx, eidx;
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+ int text_len = strlen(text), itext_len;
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+
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+ matches = matchend = NULL;
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+
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+ /* walk through all items */
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+ for (it = items; it && it->text; it++) {
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+ if (text_len) {
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+ itext_len = strlen(it->text);
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+ pidx = 0; /* pointer */
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+ sidx = eidx = -1; /* start of match, end of match */
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+ /* walk through item text */
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+ for (i = 0; i < itext_len && (c = it->text[i]); i++) {
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+ /* fuzzy match pattern */
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+ if (!fstrncmp(&text[pidx], &c, 1)) {
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+ if(sidx == -1)
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+ sidx = i;
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+ pidx++;
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+ if (pidx == text_len) {
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+ eidx = i;
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+ break;
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+ }
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+ }
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+ }
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+ /* build list of matches */
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+ if (eidx != -1) {
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+ /* compute distance */
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+ /* add penalty if match starts late (log(sidx+2))
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+ * add penalty for long a match without many matching characters */
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+ it->distance = log(sidx + 2) + (double)(eidx - sidx - text_len);
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+ /* fprintf(stderr, "distance %s %f\n", it->text, it->distance); */
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+ appenditem(it, &matches, &matchend);
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+ number_of_matches++;
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+ }
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+ } else {
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+ appenditem(it, &matches, &matchend);
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+ }
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+ }
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+
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+ if (number_of_matches) {
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+ /* initialize array with matches */
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+ if (!(fuzzymatches = realloc(fuzzymatches, number_of_matches * sizeof(struct item*))))
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+ die("cannot realloc %u bytes:", number_of_matches * sizeof(struct item*));
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+ for (i = 0, it = matches; it && i < number_of_matches; i++, it = it->right) {
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+ fuzzymatches[i] = it;
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+ }
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+ /* sort matches according to distance */
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+ qsort(fuzzymatches, number_of_matches, sizeof(struct item*), compare_distance);
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+ /* rebuild list of matches */
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+ matches = matchend = NULL;
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+ for (i = 0, it = fuzzymatches[i]; i < number_of_matches && it && \
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+ it->text; i++, it = fuzzymatches[i]) {
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+ appenditem(it, &matches, &matchend);
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+ }
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+ free(fuzzymatches);
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+ }
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+ curr = sel = matches;
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+ calcoffsets();
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+}
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+
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static void
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match(void)
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{
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+ if (fuzzy) {
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+ fuzzymatch();
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+ return;
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+ }
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static char **tokv = NULL;
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static int tokn = 0;
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@@ -702,6 +789,8 @@ main(int argc, char *argv[])
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topbar = 0;
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else if (!strcmp(argv[i], "-f")) /* grabs keyboard before reading stdin */
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fast = 1;
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+ else if (!strcmp(argv[i], "-F")) /* grabs keyboard before reading stdin */
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+ fuzzy = 0;
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else if (!strcmp(argv[i], "-i")) { /* case-insensitive item matching */
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fstrncmp = strncasecmp;
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fstrstr = cistrstr;
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--
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2.22.0
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