//: Allow mu programs to log facts just like we've been doing in C++ so far.

:(scenario trace)
def main [
  trace 1, [foo], [this is a trace in mu]
]
+foo: this is a trace in mu

:(before "End Primitive Recipe Declarations")
TRACE,
:(before "End Primitive Recipe Numbers")
put(Recipe_ordinal, "trace", TRACE);
:(before "End Primitive Recipe Checks")
case TRACE: {
  if (SIZE(inst.ingredients) < 3) {
    raise << maybe(get(Recipe, r).name) << "'trace' takes three or more ingredients rather than '" << inst.original_string << "'\n" << end();
    break;
  }
  if (!is_mu_number(inst.ingredients.at(0))) {
    raise << maybe(get(Recipe, r).name) << "first ingredient of 'trace' should be a number (depth), but got '" << inst.ingredients.at(0).original_string << "'\n" << end();
    break;
  }
  if (!is_literal_text(inst.ingredients.at(1))) {
    raise << maybe(get(Recipe, r).name) << "second ingredient of 'trace' should be a literal string (label), but got '" << inst.ingredients.at(1).original_string << "'\n" << end();
    break;
  }
  break;
}
:(before "End Primitive Recipe Implementations")
case TRACE: {
  int depth = ingredients.at(0).at(0);
  string label = current_instruction().ingredients.at(1).name;
  ostringstream out;
  for (int i = 2; i < SIZE(current_instruction().ingredients); ++i) {
    if (i > 2) out << ' ';
    out << print_mu(current_instruction().ingredients.at(i), ingredients.at(i));
  }
  trace(depth, label) << out.str() << end();
  break;
}

//: simpler limited version of 'trace'

:(before "End Primitive Recipe Declarations")
STASH,
:(before "End Primitive Recipe Numbers")
put(Recipe_ordinal, "stash", STASH);
:(before "End Primitive Recipe Checks")
case STASH: {
  break;
}
:(before "End Primitive Recipe Implementations")
case STASH: {
  ostringstream out;
  for (int i = 0; i < SIZE(current_instruction().ingredients); ++i) {
    if (i) out << ' ';
    out << print_mu(current_instruction().ingredients.at(i), ingredients.at(i));
  }
  trace(2, "app") << out.str() << end();
  break;
}

:(scenario stash_literal_string)
def main [
  stash [foo]
]
+app: foo

:(scenario stash_literal_number)
def main [
  stash [foo:], 4
]
+app: foo: 4

:(scenario stash_number)
def main [
  1:num <- copy 34
  stash [foo:], 1:num
]
+app: foo: 34

:(code)
string print_mu(const reagent& r, const vector<double>& data) {
  if (is_literal(r))
    return r.name;
  // End print Special-cases(r, data)
  ostringstream out;
  for (long long i = 0; i < SIZE(data); ++i) {
    if (i) out << ' ';
    out << no_scientific(data.at(i));
  }
  return out.str();
}

:(before "End Primitive Recipe Declarations")
HIDE_ERRORS,
:(before "End Primitive Recipe Numbers")
put(Recipe_ordinal, "hide-errors", HIDE_ERRORS);
:(before "End Primitive Recipe Checks")
case HIDE_ERRORS: {
  break;
}
:(before "End Primitive Recipe Implementations")
case HIDE_ERRORS: {
  Hide_errors = true;
  break;
}

:(before "End Primitive Recipe Declarations")
SHOW_ERRORS,
:(before "End Primitive Recipe Numbers")
put(Recipe_ordinal, "show-errors", SHOW_ERRORS);
:(before "End Primitive Recipe Checks")
case SHOW_ERRORS: {
  break;
}
:(before "End Primitive Recipe Implementations")
case SHOW_ERRORS: {
  Hide_errors = false;
  break;
}

:(before "End Primitive Recipe Declarations")
TRACE_UNTIL,
:(before "End Primitive Recipe Numbers")
put(Recipe_ordinal, "trace-until", TRACE_UNTIL);
:(before "End Primitive Recipe Checks")
case TRACE_UNTIL: {
  break;
}
:(before "End Primitive Recipe Implementations")
case TRACE_UNTIL: {
  if (Trace_stream) {
    Trace_stream->collect_depth = ingredients.at(0).at(0);
  }
  break;
}

:(before "End Primitive Recipe Declarations")
_DUMP_TRACE,
:(before "End Primitive Recipe Numbers")
put(Recipe_ordinal, "$dump-trace", _DUMP_TRACE);
:(before "End Primitive Recipe Checks")
case _DUMP_TRACE: {
  break;
}
:(before "End Primitive Recipe Implementations")
case _DUMP_TRACE: {
  if (ingredients.empty()) {
    DUMP("");
  }
  else {
    DUMP(current_instruction().ingredients.at(0).name);
  }
  break;
}

:(before "End Primitive Recipe Declarations")
_CLEAR_TRACE,
:(before "End Primitive Recipe Numbers")
put(Recipe_ordinal, "$clear-trace", _CLEAR_TRACE);
:(before "End Primitive Recipe Checks")
case _CLEAR_TRACE: {
  break;
}
:(before "End Primitive Recipe Implementations")
case _CLEAR_TRACE: {
  if (Trace_stream) Trace_stream->past_lines.clear();
  break;
}

:(before "End Primitive Recipe Declarations")
_SAVE_TRACE,
:(before "End Primitive Recipe Numbers")
put(Recipe_ordinal, "$save-trace", _SAVE_TRACE);
:(before "End Primitive Recipe Checks")
case _SAVE_TRACE: {
  break;
}
:(before "End Primitive Recipe Implementations")
case _SAVE_TRACE: {
  if (Save_trace) {
    ofstream fout("last_trace");
    fout << Trace_stream->readable_contents("");
    fout.close();
  }
  break;
}

//: assert: perform sanity checks at runtime

:(scenario assert)
% Hide_errors = true;  // '%' lines insert arbitrary C code into tests before calling 'run' with the lines below. Must be immediately after :(scenario) line.
def main [
  assert 0, [this is an assert in mu]
]
+error: this is an assert in mu

:(before "End Primitive Recipe Declarations")
ASSERT,
:(before "End Primitive Recipe Numbers")
put(Recipe_ordinal, "assert", ASSERT);
:(before "End Primitive Recipe Checks")
case ASSERT: {
  if (SIZE(inst.ingredients) != 2) {
    raise << maybe(get(Recipe, r).name) << "'assert' takes exactly two ingredients rather than '" << inst.original_string << "'\n" << end();
    break;
  }
  if (!is_mu_scalar(inst.ingredients.at(0))) {
    raise << maybe(get(Recipe, r).name) << "'assert' requires a boolean for its first ingredient, but got '" << inst.ingredients.at(0).original_string << "'\n" << end();
    break;
  }
  if (!is_literal_text(inst.ingredients.at(1))) <style>pre { line-height: 125%; }
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