added rule.c, a starting point for a rule engine

cmd/wm/Makefile

@@ -9,7 +9,7 @@ LDFLAGS  += -L../../liblitz -llitz -L../../libixp -lixp -L../../libcext -lcext
 # Solaris
 # LDFLAGS += -lsocket
 
-SRC      = area.c bar.c fs.c frame.c wm.c kb.c client.c event.c mouse.c tag.c
+SRC      = area.c bar.c fs.c frame.c wm.c kb.c client.c event.c mouse.c rule.c tag.c
 OBJ      = ${SRC:.c=.o}
 
 all: wmiiwm

cmd/wm/rule.c

@@ -0,0 +1,99 @@
+/*
+ * (C)opyright MMVI Anselm R. Garbe <garbeam at gmail dot com>
+ * See LICENSE file for license details.
+ */
+
+#include <string.h>
+#include <stdlib.h>
+#include "wm.h"
+
+/* 
+ * basic rule matching language
+ *
+ * /pattern/ -> tag [tag ...] 
+ */
+
+typedef struct {
+	char pattern[256];
+	char tags[256];
+} Rule;
+
+enum {
+	IGNORE,
+	PATTERN,
+	TAGS
+};
+
+/* free the result */
+static Rule *
+parse(char *data, unsigned int *n)
+{
+	Rule *rules;
+	unsigned int i;
+	int mode = IGNORE;
+	char *last = nil, *p, *pattern, *tags;
+
+	if(!data || !strlen(data))
+		return nil;
+
+	*n = 0;
+	for(last = p = data; *p; p++)
+		if(*p == '\n')
+			*n++;
+
+	rules = cext_emallocz(sizeof(Rule) * (*n));
+
+	i = 0;
+	for(p = data; *p; p++) {
+		switch(mode) {
+			case IGNORE:
+				if(*p == '/') {
+					mode = PATTERN;
+					pattern = rules[i].pattern;
+				}
+				else if(*p == '>' && last && *last == '-') {
+					mode = TAGS;
+					tags = rules[i].tags;
+				}
+				break;
+			case PATTERN:
+				if(*p == '/') {
+					mode = IGNORE;
+					*pattern = 0;
+				}
+				else {
+					*pattern = *p;
+					pattern++;
+				}
+				break;
+			case TAGS:
+				if(*p == ' ' && !strlen(tags))
+					break;
+				else if(*p == '\n') {
+					*tags = 0;
+					mode = IGNORE;
+					i++;
+				}
+				else {
+					*tags = *p;
+					tags++;
+				}
+				break;
+		}
+		last = p;
+	}
+
+	return rules;
+}
+
+char *
+match_tags(char *ruledef, Client *c)
+{
+	unsigned int n;
+	Rule *rules = parse(ruledef, &n);
+
+
+
+	free(rules);
+	return nil;
+}

cmd/wm/wm.h

@@ -285,6 +285,9 @@ void grab_mouse(Window w, unsigned long mod, unsigned int button);
 void ungrab_mouse(Window w, unsigned long mod, unsigned int button);
 char *warp_mouse(char *arg);
 
+/* rule.c */
+char *match_tags(char *ruledef, Client *c);
+
 /* tag.c */
 Tag *alloc_tag(char *name);
 char *destroy_tag(Tag *t);