int handle_import_callback(struct ImportCtx *ctx, PyObject *import_callback)
{
if (import_callback == NULL) return 1;
if (!PyCallable_Check(import_callback)) {
PyErr_SetString(PyExc_TypeError, "import_callback must be callable");
return 0;
}
jsonnet_import_callback(ctx->vm, cpython_import_callback, ctx);
return 1;
}
int main(int argc, const char **argv)
{
std::vector<std::string> jpaths;
jpaths.emplace_back("/usr/share/" JSONNET_VERSION "/");
jpaths.emplace_back("/usr/local/share/" JSONNET_VERSION "/");
JsonnetVm *vm = jsonnet_make();
bool filename_is_code = false;
bool multi = false;
auto args = simplify_args(argc, argv);
std::vector<std::string> remaining_args;
for (unsigned i=0 ; i<args.size() ; ++i) {
const std::string &arg = args[i];
if (arg == "-h" || arg == "--help") {
usage(std::cout);
return EXIT_SUCCESS;
} else if (arg == "-v" || arg == "--version") {
version(std::cout);
return EXIT_SUCCESS;
} else if (arg == "-s" || arg == "--max-stack") {
long l = strtol_check(next_arg(i, args));
if (l < 1) {
std::cerr << "ERROR: Invalid --max-stack value: " << l << "\n" << std::endl;
usage(std::cerr);
return EXIT_FAILURE;
}
jsonnet_max_stack(vm, l);
} else if (arg == "-J" || arg == "--jpath") {
std::string dir = next_arg(i, args);
if (dir.length() == 0) {
std::cerr << "ERROR: -J argument was empty string" << std::endl;
return EXIT_FAILURE;
}
if (dir[dir.length() - 1] != '/')
dir += '/';
jpaths.push_back(dir);
} else if (arg == "-E" || arg == "--env") {
const std::string var = next_arg(i, args);
const char *val = ::getenv(var.c_str());
if (val == nullptr) {
std::cerr << "ERROR: Environment variable " << var
<< " was undefined." << std::endl;
return EXIT_FAILURE;
}
jsonnet_ext_var(vm, var.c_str(), val);
} else if (arg == "-V" || arg == "--var") {
const std::string var_val = next_arg(i, args);
size_t eq_pos = var_val.find_first_of('=', 0);
if (eq_pos == std::string::npos) {
std::cerr << "ERROR: argument not in form <var>=<val> \""
<< var_val << "\"." << std::endl;
return EXIT_FAILURE;
}
const std::string var = var_val.substr(0, eq_pos);
const std::string val = var_val.substr(eq_pos + 1, std::string::npos);
jsonnet_ext_var(vm, var.c_str(), val.c_str());
} else if (arg == "--gc-min-objects") {
long l = strtol_check(next_arg(i, args));
if (l < 0) {
std::cerr << "ERROR: Invalid --gc-min-objects value: " << l << std::endl;
usage(std::cerr);
return EXIT_FAILURE;
}
jsonnet_gc_min_objects(vm, l);
} else if (arg == "-t" || arg == "--max-trace") {
long l = strtol_check(next_arg(i, args));
if (l < 0) {
std::cerr << "ERROR: Invalid --max-trace value: " << l << std::endl;
usage(std::cerr);
return EXIT_FAILURE;
}
jsonnet_max_trace(vm, l);
} else if (arg == "--gc-growth-trigger") {
const char *arg = next_arg(i,args).c_str();
char *ep;
double v = std::strtod(arg, &ep);
if (*ep != '\0' || *arg == '\0') {
std::cerr << "ERROR: Invalid number \"" << arg << "\"" << std::endl;
usage(std::cerr);
return EXIT_FAILURE;
}
if (v < 0) {
std::cerr << "ERROR: Invalid --gc-growth-trigger \"" << arg << "\"\n" << std::endl;
usage(std::cerr);
return EXIT_FAILURE;
}
jsonnet_gc_growth_trigger(vm, v);
} else if (arg == "-e" || arg == "--exec") {
filename_is_code = true;
} else if (arg == "-m" || arg == "--multi") {
multi = true;
} else if (arg == "-S" || arg == "--string") {
jsonnet_string_output(vm, 1);
} else if (arg == "--debug-ast") {
jsonnet_debug_ast(vm, true);
} else if (arg == "--") {
// All subsequent args are not options.
while ((++i) < args.size())
remaining_args.push_back(args[i]);
break;
} else {
remaining_args.push_back(args[i]);
}
}
const char *want = filename_is_code ? "code" : "filename";
if (remaining_args.size() == 0) {
std::cerr << "ERROR: Must give " << want << "\n" << std::endl;
usage(std::cerr);
return EXIT_FAILURE;
}
std::string filename = remaining_args[0];
if (remaining_args.size() > 1) {
std::cerr << "ERROR: Already specified " << want << " as \"" << filename << "\"\n"
<< std::endl;
usage(std::cerr);
return EXIT_FAILURE;
}
std::string input;
if (filename_is_code) {
input = filename;
filename = "<cmdline>";
} else {
if (filename == "-") {
filename = "<stdin>";
input.assign(std::istreambuf_iterator<char>(std::cin),
std::istreambuf_iterator<char>());
} else {
std::ifstream f;
f.open(filename.c_str());
if (!f.good()) {
std::string msg = "Opening input file: " + filename;
perror(msg.c_str());
return EXIT_FAILURE;
}
input.assign(std::istreambuf_iterator<char>(f),
std::istreambuf_iterator<char>());
if (!f.good()) {
std::string msg = "Reading input file: " + filename;
perror(msg.c_str());
return EXIT_FAILURE;
}
}
}
ImportCallbackContext import_callback_ctx { vm, &jpaths };
jsonnet_import_callback(vm, import_callback, &import_callback_ctx);
int error;
char *output;
if (multi) {
output = jsonnet_evaluate_snippet_multi(vm, filename.c_str(), input.c_str(), &error);
} else {
output = jsonnet_evaluate_snippet(vm, filename.c_str(), input.c_str(), &error);
}
if (error) {
std::cerr << output;
std::cerr.flush();
jsonnet_realloc(vm, output, 0);
jsonnet_destroy(vm);
return EXIT_FAILURE;
}
if (multi) {
std::map<std::string, std::string> r;
for (const char *c=output ; *c!='\0' ; ) {
const char *filename = c;
const char *c2 = c;
while (*c2 != '\0') ++c2;
++c2;
const char *json = c2;
while (*c2 != '\0') ++c2;
++c2;
c = c2;
r[filename] = json;
}
jsonnet_realloc(vm, output, 0);
for (const auto &pair : r) {
const std::string &new_content = pair.second;
const std::string &filename = pair.first;
std::cout << filename << std::endl;
{
std::ifstream exists(filename.c_str());
if (exists.good()) {
std::string existing_content;
existing_content.assign(std::istreambuf_iterator<char>(exists),
std::istreambuf_iterator<char>());
if (existing_content == new_content) {
// Do not bump the timestamp on the file if its content is the same.
// This may trigger other tools (e.g. make) to do unnecessary work.
continue;
}
}
}
std::ofstream f;
f.open(filename.c_str());
if (!f.good()) {
std::string msg = "Opening output file: " + filename;
perror(msg.c_str());
jsonnet_destroy(vm);
return EXIT_FAILURE;
}
f << new_content;
f.close();
if (!f.good()) {
std::string msg = "Writing to output file: " + filename;
perror(msg.c_str());
jsonnet_destroy(vm);
return EXIT_FAILURE;
}
}
std::cout.flush();
} else {
std::cout << output;
std::cout.flush();
jsonnet_realloc(vm, output, 0);
}
jsonnet_destroy(vm);
return EXIT_SUCCESS;
}
int main(int argc, const char **argv)
{
try {
JsonnetVm *vm = jsonnet_make();
JsonnetConfig config;
if (!process_args(argc, argv, &config, vm)) {
return EXIT_FAILURE;
}
// Read input files.
std::string input;
if (!read_input(&config, &input)) {
return EXIT_FAILURE;
}
// Set import callbacks for jpaths.
ImportCallbackContext import_callback_ctx{vm, config.mutable_jpaths()};
jsonnet_import_callback(vm, import_callback, &import_callback_ctx);
// Evaluate input Jsonnet and handle any errors from Jsonnet VM.
int error;
char *output;
if (config.multi()) {
output = jsonnet_evaluate_snippet_multi(
vm, config.input_file().c_str(), input.c_str(), &error);
} else {
output = jsonnet_evaluate_snippet(
vm, config.input_file().c_str(), input.c_str(), &error);
}
if (error) {
std::cerr << output;
std::cerr.flush();
jsonnet_realloc(vm, output, 0);
jsonnet_destroy(vm);
return EXIT_FAILURE;
}
// Write output JSON.
if (config.multi()) {
if (!write_multi_output_files(vm, output, config.output_dir())) {
return EXIT_FAILURE;
}
} else {
bool successful = write_output_file(output, config.output_file());
jsonnet_realloc(vm, output, 0);
if (!successful) {
jsonnet_destroy(vm);
return EXIT_FAILURE;
}
}
jsonnet_destroy(vm);
return EXIT_SUCCESS;
} catch (const std::bad_alloc &) {
// Avoid further allocation attempts
fputs("Internal out-of-memory error (please report this)\n", stderr);
} catch (const std::exception &e) {
std::cerr << "Internal error (please report this): "
<< e.what() << std::endl;
} catch (...) {
std::cerr << "An unknown exception occurred (please report this)."
<< std::endl;
}
return EXIT_FAILURE;
}
