Made statusbar clickable. Sends signal to dwmblocks

config.def.h

@@ -59,10 +59,6 @@ static char dmenumon[2] = "0"; /* component of dmenucmd, manipulated in spawn()
 static const char *dmenucmd[] = { "dmenu_run", "-m", dmenumon, "-fn", dmenufont, "-nb", col_gray1, "-nf", col_gray3, "-sb", col_cyan, "-sf", col_gray4, NULL };
 static const char *termcmd[]  = { "st", NULL };
 
-/* commands spawned when clicking statusbar, the mouse button pressed is exported as BUTTON */
-static char *statuscmds[] = { "notify-send Mouse$BUTTON" };
-static char *statuscmd[] = { "/bin/sh", "-c", NULL, NULL };
-
 static Key keys[] = {
 	/* modifier                     key        function        argument */
 	{ MODKEY,                       XK_p,      spawn,          {.v = dmenucmd } },
@@ -107,9 +103,9 @@ static Button buttons[] = {
 	{ ClkLtSymbol,          0,              Button1,        setlayout,      {0} },
 	{ ClkLtSymbol,          0,              Button3,        setlayout,      {.v = &layouts[2]} },
 	{ ClkWinTitle,          0,              Button2,        zoom,           {0} },
-	{ ClkStatusText,        0,              Button1,        spawn,          {.v = statuscmd } },
-	{ ClkStatusText,        0,              Button2,        spawn,          {.v = statuscmd } },
-	{ ClkStatusText,        0,              Button3,        spawn,          {.v = statuscmd } },
+	{ ClkStatusText,        0,              Button1,        sigdwmblocks,   {.i = 1} },
+	{ ClkStatusText,        0,              Button2,        sigdwmblocks,   {.i = 2} },
+	{ ClkStatusText,        0,              Button3,        sigdwmblocks,   {.i = 3} },
 	{ ClkClientWin,         MODKEY,         Button1,        movemouse,      {0} },
 	{ ClkClientWin,         MODKEY,         Button2,        togglefloating, {0} },
 	{ ClkClientWin,         MODKEY,         Button3,        resizemouse,    {0} },

dwm.c

@@ -170,6 +170,7 @@ static void focus(Client *c);
 static void focusin(XEvent *e);
 static void focusmon(const Arg *arg);
 static void focusstack(const Arg *arg);
+static int getdwmblockspid();
 static Atom getatomprop(Client *c, Atom prop);
 static int getrootptr(int *x, int *y);
 static long getstate(Window w);
@@ -207,6 +208,7 @@ static void setup(void);
 static void seturgent(Client *c, int urg);
 static void showhide(Client *c);
 static void sigchld(int unused);
+static void sigdwmblocks(const Arg *arg);
 static void spawn(const Arg *arg);
 static void tag(const Arg *arg);
 static void tagmon(const Arg *arg);
@@ -240,8 +242,8 @@ static void zoom(const Arg *arg);
 static const char broken[] = "broken";
 static char stext[256];
 static char rawstext[256];
-static int statuscmdn;
-static char lastbutton[] = "-";
+static int dwmblockssig;
+pid_t dwmblockspid = 0;
 static int screen;
 static int sw, sh;           /* X display screen geometry width, height */
 static int bh, blw = 0;      /* bar geometry */
@@ -426,7 +428,6 @@ buttonpress(XEvent *e)
 	Client *c;
 	Monitor *m;
 	XButtonPressedEvent *ev = &e->xbutton;
-	*lastbutton = '0' + ev->button;
 
 	click = ClkRootWin;
 	/* focus monitor if necessary */
@@ -447,11 +448,10 @@ buttonpress(XEvent *e)
 			click = ClkLtSymbol;
 		else if (ev->x > (x = selmon->ww - TEXTW(stext) + lrpad)) {
 			click = ClkStatusText;
-
 			char *text = rawstext;
 			int i = -1;
 			char ch;
-			statuscmdn = 0;
+			dwmblockssig = 0;
 			while (text[++i]) {
 				if ((unsigned char)text[i] < ' ') {
 					ch = text[i];
@@ -461,7 +461,7 @@ buttonpress(XEvent *e)
 					text += i+1;
 					i = -1;
 					if (x >= ev->x) break;
-					if (ch <= LENGTH(statuscmds)) statuscmdn = ch - 1;
+					dwmblockssig = ch;
 				}
 			}
 		} else
@@ -907,6 +907,18 @@ getatomprop(Client *c, Atom prop)
 	return atom;
 }
 
+int
+getdwmblockspid()
+{
+	char buf[16];
+	FILE *fp = popen("pidof -s dwmblocks", "r");
+	fgets(buf, sizeof(buf), fp);
+	pid_t pid = strtoul(buf, NULL, 10);
+	pclose(fp);
+	dwmblockspid = pid;
+	return pid != 0 ? 0 : -1;
+}
+
 int
 getrootptr(int *x, int *y)
 {
@@ -1672,15 +1684,28 @@ sigchld(int unused)
 	while (0 < waitpid(-1, NULL, WNOHANG));
 }
 
+void
+sigdwmblocks(const Arg *arg)
+{
+	union sigval sv;
+	sv.sival_int = (dwmblockssig << 8) | arg->i;
+	if (!dwmblockspid)
+		if (getdwmblockspid() == -1)
+			return;
+
+	if (sigqueue(dwmblockspid, SIGUSR1, sv) == -1) {
+		if (errno == ESRCH) {
+			if (!getdwmblockspid())
+				sigqueue(dwmblockspid, SIGUSR1, sv);
+		}
+	}
+}
+
 void
 spawn(const Arg *arg)
 {
 	if (arg->v == dmenucmd)
 		dmenumon[0] = '0' + selmon->num;
-	else if (arg->v == statuscmd) {
-		statuscmd[2] = statuscmds[statuscmdn];
-		setenv("BUTTON", lastbutton, 1);
-	}
 	if (fork() == 0) {
 		if (dpy)
 			close(ConnectionNumber(dpy));