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From d166c2c90f777f5a80f628d493cdcf7bf03034b8 Mon Sep 17 00:00:00 2001
From: Justinas Grigas <dev@jstnas.com>
Date: Mon, 17 Jun 2024 02:52:15 +0100
Subject: [PATCH] fuzzymatch: Add support for fuzzy-matching
This version of the patch updates the manpage.
---
config.def.h | 1 +
config.mk | 2 +-
dmenu.1 | 5 ++-
dmenu.c | 90 +++++++++++++++++++++++++++++++++++++++++++++++++++-
4 files changed, 95 insertions(+), 3 deletions(-)
diff --git a/config.def.h b/config.def.h
index 1edb647..a4e6174 100644
--- a/config.def.h
+++ b/config.def.h
@@ -2,6 +2,7 @@
/* Default settings; can be overriden by command line. */
static int topbar = 1; /* -b option; if 0, dmenu appears at bottom */
+static int fuzzy = 1; /* -F option; if 0, dmenu doesn't use fuzzy matching */
/* -fn option overrides fonts[0]; default X11 font or font set */
static const char *fonts[] = {
"monospace:size=10"
diff --git a/config.mk b/config.mk
index 137f7c8..6a19175 100644
--- a/config.mk
+++ b/config.mk
@@ -21,7 +21,7 @@ FREETYPEINC = /usr/include/freetype2
# includes and libs
INCS = -I$(X11INC) -I$(FREETYPEINC)
-LIBS = -L$(X11LIB) -lX11 $(XINERAMALIBS) $(FREETYPELIBS)
+LIBS = -L$(X11LIB) -lX11 $(XINERAMALIBS) $(FREETYPELIBS) -lm
# flags
CPPFLAGS = -D_DEFAULT_SOURCE -D_BSD_SOURCE -D_XOPEN_SOURCE=700 -D_POSIX_C_SOURCE=200809L -DVERSION=\"$(VERSION)\" $(XINERAMAFLAGS)
diff --git a/dmenu.1 b/dmenu.1
index 323f93c..e2c5ef4 100644
--- a/dmenu.1
+++ b/dmenu.1
@@ -3,7 +3,7 @@
dmenu \- dynamic menu
.SH SYNOPSIS
.B dmenu
-.RB [ \-bfiv ]
+.RB [ \-bFfiv ]
.RB [ \-l
.IR lines ]
.RB [ \-m
@@ -40,6 +40,9 @@ which lists programs in the user's $PATH and runs the result in their $SHELL.
.B \-b
dmenu appears at the bottom of the screen.
.TP
+.B \-F
+disables fuzzy matching.
+.TP
.B \-f
dmenu grabs the keyboard before reading stdin if not reading from a tty. This
is faster, but will lock up X until stdin reaches end\-of\-file.
diff --git a/dmenu.c b/dmenu.c
index 40f93e0..03e1f45 100644
--- a/dmenu.c
+++ b/dmenu.c
@@ -1,6 +1,7 @@
/* See LICENSE file for copyright and license details. */
#include <ctype.h>
#include <locale.h>
+#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
@@ -31,6 +32,7 @@ struct item {
char *text;
struct item *left, *right;
int out;
+ double distance;
};
static char text[BUFSIZ] = "";
@@ -226,9 +228,93 @@ grabkeyboard(void)
die("cannot grab keyboard");
}
+int
+compare_distance(const void *a, const void *b)
+{
+ struct item *da = *(struct item **) a;
+ struct item *db = *(struct item **) b;
+
+ if (!db)
+ return 1;
+ if (!da)
+ return -1;
+
+ return da->distance == db->distance ? 0 : da->distance < db->distance ? -1 : 1;
+}
+
+void
+fuzzymatch(void)
+{
+ /* bang - we have so much memory */
+ struct item *it;
+ struct item **fuzzymatches = NULL;
+ char c;
+ int number_of_matches = 0, i, pidx, sidx, eidx;
+ int text_len = strlen(text), itext_len;
+
+ matches = matchend = NULL;
+
+ /* walk through all items */
+ for (it = items; it && it->text; ++it) {
+ if (text_len) {
+ itext_len = strlen(it->text);
+ pidx = 0; /* pointer */
+ sidx = eidx = -1; /* start of match, end of match */
+ /* walk through item text */
+ for (i = 0; i < itext_len && (c = it->text[i]); ++i) {
+ /* fuzzy match pattern */
+ if (!fstrncmp(&text[pidx], &c, 1)) {
+ if(sidx == -1)
+ sidx = i;
+ ++pidx;
+ if (pidx == text_len) {
+ eidx = i;
+ break;
+ }
+ }
+ }
+ /* build list of matches */
+ if (eidx != -1) {
+ /* compute distance */
+ /* add penalty if match starts late (log(sidx+2))
+ * add penalty for long a match without many matching characters */
+ it->distance = log(sidx + 2) + (double)(eidx - sidx - text_len);
+ /* fprintf(stderr, "distance %s %f\n", it->text, it->distance); */
+ appenditem(it, &matches, &matchend);
+ ++number_of_matches;
+ }
+ } else {
+ appenditem(it, &matches, &matchend);
+ }
+ }
+
+ if (number_of_matches) {
+ /* initialize array with matches */
+ if (!(fuzzymatches = realloc(fuzzymatches,
+ number_of_matches * sizeof(struct item *))))
+ die("cannot realloc %u bytes:", number_of_matches * sizeof(struct item *));
+ for (i = 0, it = matches; it && i < number_of_matches; ++i, it = it->right)
+ fuzzymatches[i] = it;
+ /* sort matches according to distance */
+ qsort(fuzzymatches, number_of_matches, sizeof(struct item*), compare_distance);
+ /* rebuild list of matches */
+ matches = matchend = NULL;
+ for (i = 0, it = fuzzymatches[i]; i < number_of_matches && it &&
+ it->text; ++i, it = fuzzymatches[i])
+ appenditem(it, &matches, &matchend);
+ free(fuzzymatches);
+ }
+ curr = sel = matches;
+ calcoffsets();
+}
+
static void
match(void)
{
+ if (fuzzy) {
+ fuzzymatch();
+ return;
+ }
static char **tokv = NULL;
static int tokn = 0;
@@ -715,7 +801,7 @@ setup(void)
static void
usage(void)
{
- die("usage: dmenu [-bfiv] [-l lines] [-p prompt] [-fn font] [-m monitor]\n"
+ die("usage: dmenu [-bFfiv] [-l lines] [-p prompt] [-fn font] [-m monitor]\n"
" [-nb color] [-nf color] [-sb color] [-sf color] [-w windowid]");
}
@@ -732,6 +818,8 @@ main(int argc, char *argv[])
exit(0);
} else if (!strcmp(argv[i], "-b")) /* appears at the bottom of the screen */
topbar = 0;
+ else if (!strcmp(argv[i], "-F")) /* disables fuzzy matching */
+ fuzzy = 0;
else if (!strcmp(argv[i], "-f")) /* grabs keyboard before reading stdin */
fast = 1;
else if (!strcmp(argv[i], "-i")) { /* case-insensitive item matching */
--
2.45.2
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