fast dmenu_path script

Makefile

@@ -3,7 +3,7 @@
 
 include config.mk
 
-all: options dmenu dmenu_path
+all: options dmenu
 
 options:
 	@echo dmenu build options:
@@ -15,22 +15,18 @@ dmenu: dmenu.o draw.o
 	@echo CC -o $@
 	@${CC} -o $@ dmenu.o draw.o ${LDFLAGS}
 
-dmenu_path: dmenu_path.o
-	@echo CC -o $@
-	@${CC} -o $@ dmenu_path.o ${LDFLAGS}
-
 .c.o: config.mk
 	@echo CC -c $<
 	@${CC} -c $< ${CFLAGS}
 
 clean:
 	@echo cleaning
-	@rm -f dmenu dmenu.o draw.o dmenu_path dmenu_path.o dmenu-${VERSION}.tar.gz
+	@rm -f dmenu dmenu.o draw.o dmenu-${VERSION}.tar.gz
 
 dist: clean
 	@echo creating dist tarball
 	@mkdir -p dmenu-${VERSION}
-	@cp LICENSE Makefile README config.mk dmenu.1 dmenu.c draw.c draw.h dmenu_path.c dmenu_run dmenu-${VERSION}
+	@cp LICENSE Makefile README config.mk dmenu.1 dmenu.c draw.c draw.h dmenu_path dmenu_run dmenu-${VERSION}
 	@tar -cf dmenu-${VERSION}.tar dmenu-${VERSION}
 	@gzip dmenu-${VERSION}.tar
 	@rm -rf dmenu-${VERSION}

dmenu.1

@@ -42,7 +42,7 @@ is a dmenu script used by dwm which lists programs in the user's PATH and
 executes the selected item.
 .P
 .B dmenu_path
-is a program used by dmenu_run to find and cache a list of executables.
+is a script used by dmenu_run to find and cache a list of executables.
 .SH OPTIONS
 .TP
 .B \-b

dmenu_path

@@ -0,0 +1,9 @@
+#!/bin/sh
+CACHE=$HOME/.dmenu_cache
+IFS=:
+
+if ! test -f "$CACHE" || find $PATH -type d -newer "$CACHE" | grep -q .; then
+	find $PATH -type f \( -perm -1 -o -perm -10 -o -perm -100 \) | sort -u > "$CACHE"
+fi
+
+cat "$CACHE"

dmenu_path.c

@@ -1,100 +0,0 @@
-/* See LICENSE file for copyright and license details. */
-#include <dirent.h>
-#include <limits.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
-#include <sys/stat.h>
-
-static void die(const char *s);
-static int qstrcmp(const void *a, const void *b);
-static void scan(void);
-static int uptodate(void);
-
-static char **items = NULL;
-static const char *home, *path;
-
-int
-main(void) {
-	if(!(home = getenv("HOME")))
-		die("no $HOME");
-	if(!(path = getenv("PATH")))
-		die("no $PATH");
-	if(chdir(home) < 0)
-		die("chdir failed");
-	if(uptodate()) {
-		execl("/bin/cat", "cat", CACHE, NULL);
-		die("exec failed");
-	}
-	scan();
-	return EXIT_SUCCESS;
-}
-
-void
-die(const char *s) {
-	fprintf(stderr, "dmenu_path: %s\n", s);
-	exit(EXIT_FAILURE);
-}
-
-int
-qstrcmp(const void *a, const void *b) {
-	return strcmp(*(const char **)a, *(const char **)b);
-}
-
-void
-scan(void) {
-	char buf[PATH_MAX];
-	char *dir, *p;
-	size_t i, count;
-	struct dirent *ent;
-	DIR *dp;
-	FILE *cache;
-
-	count = 0;
-	if(!(p = strdup(path)))
-		die("strdup failed");
-	for(dir = strtok(p, ":"); dir; dir = strtok(NULL, ":")) {
-		if(!(dp = opendir(dir)))
-			continue;
-		while((ent = readdir(dp))) {
-			snprintf(buf, sizeof buf, "%s/%s", dir, ent->d_name);
-			if(ent->d_name[0] == '.' || access(buf, X_OK) < 0)
-				continue;
-			if(!(items = realloc(items, ++count * sizeof *items)))
-				die("malloc failed");
-			if(!(items[count-1] = strdup(ent->d_name)))
-				die("strdup failed");
-		}
-		closedir(dp);
-	}
-	qsort(items, count, sizeof *items, qstrcmp);
-	if(!(cache = fopen(CACHE, "w")))
-		die("open failed");
-	for(i = 0; i < count; i++) {
-		if(i > 0 && !strcmp(items[i], items[i-1]))
-			continue;
-		fprintf(cache,  "%s\n", items[i]);
-		fprintf(stdout, "%s\n", items[i]);
-	}
-	fclose(cache);
-	free(p);
-}
-
-int
-uptodate(void) {
-	char *dir, *p;
-	time_t mtime;
-	struct stat st;
-
-	if(stat(CACHE, &st) < 0)
-		return 0;
-	mtime = st.st_mtime;
-	if(!(p = strdup(path)))
-		die("strdup failed");
-	for(dir = strtok(p, ":"); dir; dir = strtok(NULL, ":"))
-		if(!stat(dir, &st) && st.st_mtime > mtime)
-			return 0;
-	free(p);
-	return 1;
-}