#include <k/cli.h>
#include <k/io.h>
#include <k/str.h>
typedef struct buffer {
char* cur;
kiochan channel;
sz run;
char buf [];
} buffer;
static buffer*
buffer_new(void* mem, kiochan channel, sz run) {
buffer* r = mem;
r -> cur = r -> buf;
r -> channel = channel;
r -> run = run;
return r;
}
static kiocond
buffer_flush(buffer* b) {
ksraw str = {b -> cur - b -> buf, b -> buf};
b -> cur = b -> buf;
return kiosend(b -> channel, str, null);
}
static kcond
buffer_send(buffer* b, const char* str) {
ksmut buf = { b->run - (b->cur - b->buf), b->cur };
ksraw src = { 0, str };
kscond sc = kscp(src, buf, &src.size);
if (sc != kscond_ok) return sc;
b->cur += src.size;
if (b->cur >= (b->buf + b->run)) {
return buffer_flush(b);
} else return kiocond_ok;
}
kcond
kcli_usage(kcli_set prg, kiochan ch) {
ubyte buf_space [sizeof(buffer) + 256];
buffer* out = buffer_new(buf_space, ch, 256);
const char* msg [] = {
prg.name, " v", prg.version, "\n\n",
prg.desc, "\n\n",
};
for (sz i = 0; i != sizeof msg / sizeof msg[0]; ++ i) {
kcond c = buffer_send(out, msg[i]);
if (!kokay(c)) return c;
}
return buffer_flush(out);
}