ADDED   readme.md
Index: readme.md
==================================================================
--- readme.md
+++ readme.md
@@ -0,0 +1,4 @@
+# util
+various odds and ends
+
+* **safekill.c**: utility to help keep from accidentally killing important windows; compile with `cc -Ofast safekill.c -lX11 -lc -osafekill`

ADDED   safekill.c
Index: safekill.c
==================================================================
--- safekill.c
+++ safekill.c
@@ -0,0 +1,120 @@
+#include <X11/Xlib.h>
+#include <X11/Xutil.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+typedef enum { false, true } bool;
+char* isvital(char* str) {
+	start: // tail calls for dipshits
+		if (*str != '{') {
+			if (*str == 0) return 0;
+			++str; goto start;
+		} else {
+			if (str[1] == 'V' && str[2] == '}')
+				return str;
+			else { ++str; goto start; }
+		}
+}
+int main(const int argc, const char** argv) {
+	Display *display;
+	Window focus;
+	int revert;
+
+	bool active;
+	enum { vitalize, devitalize, hardkill, softkill } op;
+
+	if (argc > 3) goto usage;
+	if (argc == 1)
+		op = softkill, active = true;
+	else {
+		if (argc == 2) active = true;
+		else           active = false;
+
+		if (argv[1][0] == '-' && argv[1][2] == 0) { // opt is short switch
+			switch (argv[1][1]) { // opt char
+
+				// make window mission-critical
+				case 'v': op = vitalize; break;
+
+				// make window acceptable loss
+				case 'c': op = devitalize; break;
+
+				// liquidate by any means necessary
+				case 'q': op = hardkill; break;
+
+				// with all due respect sir what the fuck
+				default: goto usage;
+			}
+		} else goto usage;
+	}
+
+	display = XOpenDisplay(NULL);
+
+	if (active) {
+		XGetInputFocus(display, &focus, &revert);
+	} else {
+		unsigned long temp = strtoul(argv[2], NULL, 0);
+		if (errno == EINVAL || errno == ERANGE) goto usage;
+		if (temp == 0) goto usage;
+		focus = (Window)temp;
+	}
+
+	if(op == hardkill) {
+		XDestroyWindow(display,focus);
+		XSync(display,false);
+		return 0;
+	}
+
+	XClassHint xclh;
+	if (XGetClassHint(display,focus,&xclh)) {
+		char* v;
+		if(v = isvital(xclh.res_class)) {
+
+			if (op == vitalize) return 0; // nothing need be done
+			else if (op == devitalize) {
+				strcpy(v, v+3);
+				XSetClassHint(display,focus,&xclh);
+				XSync(display,false);
+			} else if (op == softkill) {
+				printf("softkill forbidden\n");
+				return 1; // ACCESS DENIED
+			}
+		} else {
+			if (op == vitalize) {
+				size_t sz=strlen(xclh.res_class); // TODO: remove double-walk
+				xclh.res_class=realloc(xclh.res_class, sz+4);
+				xclh.res_class[sz]='{';
+				xclh.res_class[sz+1]='V';
+				xclh.res_class[sz+2]='}';
+				xclh.res_class[sz+3]=0;
+				XSetClassHint(display,focus,&xclh);
+				XSync(display,false);
+			} else if (op == devitalize) return 0;
+			else if (op == softkill) {
+				// ice that motherfucker
+				XDestroyWindow(display,focus);
+				XSync(display,false);
+				return 3;
+			}
+		}
+	} else {
+		printf("\x1b[1merror:\x1b[m bad window\n");
+		goto usage;
+	}
+
+	return 0;
+
+usage:
+	#define info  "\x1b[34m-- "
+	#define param "\x1b[32m"
+	#define eol   "\x1b[m\n"
+	#define bold  "\x1b[1m"
+	#define nl    "       "
+	printf(bold "usage:\x1b[0m %s    "       "     " info "kill active window if non-vital" eol
+						 nl "%1$s -v " param "[id] " info "make [id] or active window vital" eol
+						 nl "%1$s -c " param "[id] " info "clear vital flag on [id] or active window" eol
+						 nl "%1$s -q " param "[id] " info "'emergency' kill w/o reference to vital flag" eol,
+				argv[0]);
+	return 1;
+}