st launches new instance, does not care about cwd

st-new-instance.diff

diff -u orig/config.def.h mod/config.def.h
--- orig/config.def.h	2020-06-19 12:29:45.000000000 +0300
+++ mod/config.def.h	2021-03-23 07:05:38.656594165 +0200
@@ -199,6 +199,7 @@
 	{ TERMMOD,              XK_Y,           selpaste,       {.i =  0} },
 	{ ShiftMask,            XK_Insert,      selpaste,       {.i =  0} },
 	{ TERMMOD,              XK_Num_Lock,    numlock,        {.i =  0} },
+    { TERMMOD,              XK_N,           newinstance,        {.i =  0} },
 };
 
 /*
diff -u orig/st.c mod/st.c
--- orig/st.c	2020-06-19 12:29:45.000000000 +0300
+++ mod/st.c	2021-03-23 07:06:56.099341909 +0200
@@ -2595,3 +2595,16 @@
 	tfulldirt();
 	draw();
 }
+
+void
+newinstance(const Arg* a)
+{
+	switch (fork()) {
+	case -1:
+		die("fork failed: %s\n", strerror(errno));
+		break;
+	case 0:
+		execlp("st", "./st", NULL);
+		break;
+	}
+}
diff -u orig/st.h mod/st.h
--- orig/st.h	2020-06-19 12:29:45.000000000 +0300
+++ mod/st.h	2021-03-23 07:06:11.467484210 +0200
@@ -81,6 +81,8 @@
 void redraw(void);
 void draw(void);
 
+void newinstance(const Arg *);
+
 void printscreen(const Arg *);
 void printsel(const Arg *);
 void sendbreak(const Arg *);