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

#include "io.h"
#include "options.h"
#include "types.h"

/* Create a new options struct. */
struct options options(int argc, char *argv[]) {
    return (struct options){
        .inputs   = { 0 },
        .ninputs  = 0,
        .modules  = { 0 },
        .nmodules = 0,
        .argv     = argv,
        .argc     = argc,
        .output   = NULL,
    };
}

/* Parse the command line options. */
int options_parse(struct options *o) {
    for (int i = 1; i < o->argc; i++) {
        if (o->argv[i][0] != '-') {
            o->inputs[o->ninputs++] = o->argv[i];
            continue;
        }
        char *arg = &o->argv[i][1];

        if (!strcmp(arg, "o")) {
            if (++i >= o->argc)
                bail("`-o` requires an output path");
            o->output = o->argv[i];
        } else if (!strcmp(arg, "mod")) {
            if (++i >= o->argc)
                bail("`-mod` requires a module path");
            o->modules[o->nmodules++] = o->argv[i];
        } else if (!strcmp(arg, "pkg") || !strcmp(arg, "entry")) {
            /* Ignored; consumed by the self-hosted compiler only. */
            i++;
        } else if (!strcmp(arg, "test") || !strcmp(arg, "dump")) {
            /* Ignored; consumed by the self-hosted compiler only. */
        } else {
            bail("unknown option `-%s`", arg);
        }
    }
    return 0;
}