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#include <u.h>
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#include <libc.h>
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void
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main(void)
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{
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	Fmt fmt;
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	char buf[512];
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	char *argv0, *args, *flags, *p, *p0;
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	int single;
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	Rune r;
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	argv0 = getenv("0");
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	if((p = strrchr(argv0, '/')) != nil)
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		argv0 = p+1;
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	flags = getenv("flagfmt");
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	args = getenv("args");
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	if(argv0 == nil){
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		fprint(2, "aux/usage: $0 not set\n");
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		exits("$0");
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	}
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	if(flags == nil)
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		flags = "";
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	if(args == nil)
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		args = "";
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	fmtfdinit(&fmt, 2, buf, sizeof buf);
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	fmtprint(&fmt, "usage: %s", argv0);
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	if(flags[0]){
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		single = 0;
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		for(p=flags; *p; ){
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			p += chartorune(&r, p);
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			if(*p == ',' || *p == 0){
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				if(!single){
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					fmtprint(&fmt, " [-");
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					single = 1;
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				}
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				fmtprint(&fmt, "%C", r);
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				if(*p == ',')
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					p++;
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				continue;
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			}
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			while(*p == ' ')
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				p++;
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			if(single){
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				fmtprint(&fmt, "]");
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				single = 0;
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			}
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			p0 = p;
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			p = strchr(p0, ',');
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			if(p == nil)
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				p = "";
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			else
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				*p++ = 0;
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			fmtprint(&fmt, " [-%C %s]", r, p0);
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		}
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		if(single)
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			fmtprint(&fmt, "]");
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	}
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	if(args)
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		fmtprint(&fmt, " %s", args);
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	fmtprint(&fmt, "\n");
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	fmtfdflush(&fmt);
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	exits("usage");
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}