diff -r dbb565b8d61c config.def.h
--- a/config.def.h	Fri Jun 25 09:42:58 2010 +0200
+++ b/config.def.h	Mon Aug 02 22:25:19 2010 +0100
@@ -37,4 +37,5 @@
     { MODKEY,               GDK_f,      spawn,      SETPROP("_SURF_FIND", "_SURF_FIND") },
     { MODKEY,               GDK_n,      find,       { .b = TRUE } },
     { MODKEY|GDK_SHIFT_MASK,GDK_n,      find,       { .b = FALSE } },
+    { MODKEY,               GDK_v,      filter,     { .v = ".surf/filter.sh" } },
 };
diff -r dbb565b8d61c surf.1
--- a/surf.1	Fri Jun 25 09:42:58 2010 +0200
+++ b/surf.1	Mon Aug 02 22:25:19 2010 +0100
@@ -89,6 +89,9 @@
 .TP
 .B Ctrl\-o
 show the sourcecode of the current page.
+.TP
+.B Ctrl\-v
+Runs page through custom filter
 .SH SEE ALSO
 .BR dmenu(1)
 .BR xprop(1)
diff -r dbb565b8d61c surf.c
--- a/surf.c	Fri Jun 25 09:42:58 2010 +0200
+++ b/surf.c	Mon Aug 02 22:25:19 2010 +0100
@@ -2,6 +2,7 @@
  *
  * To understand surf, start reading main().
  */
+#define _POSIX_SOURCE /* keep glibc happy to use fdopen */
 #include <signal.h>
 #include <X11/X.h>
 #include <X11/Xatom.h>
@@ -76,6 +77,7 @@
 static void die(char *str);
 static void drawindicator(Client *c);
 static gboolean exposeindicator(GtkWidget *w, GdkEventExpose *e, Client *c);
+static void filter(Client *c, const Arg *arg);
 static void find(Client *c, const Arg *arg);
 static const char *getatom(Client *c, int a);
 static const char *getcookies(SoupURI *uri);
@@ -276,6 +278,78 @@
 	webkit_web_view_search_text(c->view, s, FALSE, forward, TRUE);
 }
 
+void
+filter(Client *c, const Arg *arg) {
+	GString *d;
+	WebKitWebFrame *frame = webkit_web_view_get_main_frame(c->view);
+	WebKitWebDataSource *source = webkit_web_frame_get_data_source(frame);
+	const char *baseuri = webkit_web_view_get_uri(c->view);
+
+	if((d = webkit_web_data_source_get_data(source)) == NULL
+			|| webkit_web_data_source_is_loading(source))
+		return;
+
+	int iop[2], oip[2];
+	pid_t pid;
+
+	if(pipe(oip)) return;
+	if(pipe(iop)) return;
+	pid = fork();
+
+	if(pid == -1) {
+		close(oip[0]);
+		close(oip[1]);
+		return;
+	} else if(pid == 0) { /* child */
+		close(iop[1]);
+		if(iop[0] != STDIN_FILENO) {
+			dup2(iop[0], STDIN_FILENO);
+			close(iop[0]);
+		}
+		close(oip[0]);
+		if(oip[1] != STDOUT_FILENO) {
+			dup2(oip[1], STDOUT_FILENO);
+			close(oip[1]);
+		}
+		execlp(buildpath((char *)arg->v), buildpath((char *)arg->v), baseuri, (char *)NULL);
+		exit(127);
+	} else { /* parent */
+		FILE *o, *i;
+		char buf[1024];
+		char *html = NULL;
+		int len;
+		i = fdopen(iop[1], "w");
+		o = fdopen(oip[0], "r");
+		close(iop[0]);
+		close(oip[1]);
+
+		/* send html to filter */
+		fprintf(i, "%s\n", d->str);
+		fclose(i);
+
+		/* get html from filter */
+		html = malloc(sizeof(char));
+		html[0] = '\0';
+		while(fgets(buf, sizeof(buf), o)) {
+			len = strlen(buf) + strlen(html) + 1;
+			html = realloc(html, len);
+			if(!html) {
+				fprintf(stderr, "realloc failed\n");
+				fclose(o);
+				return;
+			}
+			strncat(html, buf, len);
+		}
+		fclose(o);
+
+		/* load html into browser */
+		webkit_web_view_load_string(c->view,
+				html,
+				NULL, NULL, baseuri);
+		free(html);
+	}
+}
+
 const char *
 getcookies(SoupURI *uri) {
 	const char *c;