add a new module to the statusbar

make it such that notifications can occur. that is, write to
~/.cache/statusbar_notification, and things appear on the bar. pretty
cool right?

builds/utils/c/status/Makefile

@@ -1,6 +1,6 @@
 LDFLAGS=`pkg-config --cflags --libs xcb`
 CFLAGS=-ggdb -fsanitize=address
-main: battery.o bspwm.o time.o battstatus.o
+main: battery.o bspwm.o time.o battstatus.o message.o
 
 clean:
 	rm *.o main

builds/utils/c/status/main.c

@@ -17,12 +17,14 @@
 #include "battstatus.h"
 #include "bspwm.h"
 #include "time.h"
+#include "message.h"
 
 struct module mods[] = {
 	{mod_battery, "battery", "BAT0", { '\0' }},
 	{mod_battstatus, "battstatus", "BAT0", { '\0' }},
 	{mod_time, "time", "", { '\0' }},
 	{mod_bspwm, "bspwm", "", { '\0' }},
+	{mod_message, "message", "/home/usr/.cache/statusbar_notification", { '\0' }},
 };
 
 void create_module_proc(int index, char *pipename) {
@@ -59,17 +61,12 @@ void redraw() {
 static char NAMED_PIPE[] = "/home/usr/.cache/statusbar_pipe";
 
 int main(void) {
-	char pipename[BUFFER_SIZE];
 	srand(time(NULL));
-	strcpy(pipename, &NAMED_PIPE);
-	pipename[sizeof(NAMED_PIPE) - 1] = 'A' + (rand() % 26);
-	pipename[sizeof(NAMED_PIPE)] = 'A' + (rand() % 26);
-	pipename[sizeof(NAMED_PIPE) + 1] = '\0';
-	mkfifo(pipename, 0666);
-	int fd = open(pipename, O_RDWR);
+	mkfifo(&NAMED_PIPE, 0666); /* it's okay if this fails */
+	int fd = open(&NAMED_PIPE, O_RDWR);
 	struct message msg;
 
-	create_module_procs(pipename);
+	create_module_procs(&NAMED_PIPE);
 
 	for (;;) {
 		int ret = read(fd, &msg, sizeof(msg));

builds/utils/c/status/message.c

@@ -0,0 +1,34 @@
+#include <unistd.h>
+#include <stdio.h>
+#include <fcntl.h>
+#include <string.h>
+#include <sys/inotify.h>
+
+#include "message.h"
+#include "common.h"
+
+int mod_message(char *config, char *name, char *pipename) {
+	struct message msg;
+	struct inotify_event buf;
+	strcpy(msg.name, name);
+
+	int fd = inotify_init();
+	int outfd = open(pipename, O_WRONLY);
+
+	for(;;) {
+		int watchdesc = inotify_add_watch(fd, config, IN_MODIFY);
+		read(fd, &buf, sizeof(struct inotify_event));
+
+		/* the file's changed, so reread it */
+		int filefd = open(config, O_RDONLY, 0);
+		int read_in = read(filefd, msg.content, sizeof(msg.content));
+		msg.content[read_in - 1] = '\0';
+		close(filefd);
+
+		/* write the new */
+		write(outfd, &msg, sizeof(msg));
+		inotify_rm_watch(fd, watchdesc); /* not sure why this is needed */
+	}
+
+	return 0;
+}

builds/utils/c/status/message.h

@@ -0,0 +1,6 @@
+#ifndef STATUS_MESSAGE_H
+#define STATUS_MESSAGE_H
+
+int mod_message(char *config, char *name, char *pipename);
+
+#endif