From 00ce50bf43b34ef9a66bc2ba0c64ba3d965ff6ea Mon Sep 17 00:00:00 2001
From: Mitchell Riedstra <mitch@riedstra.dev>
Date: Tue, 31 Jan 2023 08:52:01 -0500
Subject: Allow regexp matching for window title and class

---
 config.def.h |  1 +
 dwm.c        |  4 ++--
 util.c       | 30 ++++++++++++++++++++++++++++++
 util.h       |  1 +
 4 files changed, 34 insertions(+), 2 deletions(-)

diff --git a/config.def.h b/config.def.h
index fa16868..83256f9 100644
--- a/config.def.h
+++ b/config.def.h
@@ -29,6 +29,7 @@ static const Rule rules[] = {
 	/* class      instance    title       tags mask     isfloating   monitor */
 	{ "Gimp",     NULL,       NULL,       0,            1,           -1 },
 	{ "Firefox",  NULL,       NULL,       1 << 8,       0,           -1 },
+	{ "ch.*um",   NULL,       NULL,       1 << 8,       0,           -1 },
 };
 
 /* layout(s) */
diff --git a/dwm.c b/dwm.c
index f9719ac..4b107d1 100644
--- a/dwm.c
+++ b/dwm.c
@@ -306,8 +306,8 @@ applyrules(Client *c)
 
 	for (i = 0; i < LENGTH(rules); i++) {
 		r = &rules[i];
-		if ((!r->title || strstr(c->name, r->title))
-		&& (!r->class || strstr(class, r->class))
+		if ((!r->title || reMatch(r->title, c->name) == 0)
+		&& (!r->class || reMatch(r->class, class) == 0)
 		&& (!r->instance || strstr(instance, r->instance)))
 		{
 			c->isfloating = r->isfloating;
diff --git a/util.c b/util.c
index 96b82c9..06685ad 100644
--- a/util.c
+++ b/util.c
@@ -3,6 +3,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <regex.h>
 
 #include "util.h"
 
@@ -34,3 +35,32 @@ ecalloc(size_t nmemb, size_t size)
 		die("calloc:");
 	return p;
 }
+
+int
+reMatch(const char *regex, const char *str) {
+    char reErr[1024] = {0};
+    regex_t *re = calloc(1, sizeof(regex_t));
+    int rc = 0;
+
+    if (!re)
+        return -1;
+
+    rc = regcomp(re, regex, REG_EXTENDED|REG_ICASE|REG_NOSUB);
+    if (rc != 0) {
+        regerror(rc, re, reErr, 1024);
+		regfree(re); re = NULL;
+        fprintf(stderr, "Regex compile err: %s %s\n", regex, reErr);
+        return -1;
+    }
+
+    rc = regexec(re, str, 0, NULL, 0);
+    regfree(re); re = NULL;
+    if (rc != 0) {
+        regerror(rc, re, reErr, 1024);
+        fprintf(stderr, "Regex match error: %s -> %s : %s\n",
+                regex, str, reErr);
+        return -1;
+    }
+
+    return rc;
+}
diff --git a/util.h b/util.h
index f633b51..cd7c08d 100644
--- a/util.h
+++ b/util.h
@@ -6,3 +6,4 @@
 
 void die(const char *fmt, ...);
 void *ecalloc(size_t nmemb, size_t size);
+int reMatch(const char *regex, const char *str);
-- 
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