PS1 in C

myprompt.c

// compile: gcc -o /somewhere/in/your/path/myprompt thisfile.c
// usage: PS1='$(myprompt $? \h \w)'

#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>

void cprint(int col, const char *str) { printf("\001\033[%dm\002%s", col, str); }

int main(int argc, const char **argv) {
	int uid = (getuid() ? 32 : 31);
	int err = (argv[1][0] == '0' ? 32 : 31);
	cprint(37, "\342\224\214\342\224\200[");
	cprint(uid, argv[2]);
	cprint(37, "]\342\224\200[");
	cprint(err, argv[3]);
	cprint(37, "]\n\342\224\224\342\224\200\342\224\200\342\225\274");
	cprint(0, " ");
	return 0;
}