json.cpp
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#include <CLI/CLI.hpp>
#include <nlohmann/json.hpp>
// This example is only built on GCC 7 on Travis due to mismatch in stdlib
// for clang (CLI11 is forgiving about mismatches, json.hpp is not)
using nlohmann::json;
class ConfigJSON : public CLI::Config {
public:
std::string to_config(const CLI::App *app, bool default_also, bool, std::string) const override {
json j;
for(const CLI::Option *opt : app->get_options({})) {
// Only process option with a long-name and configurable
if(!opt->get_lnames().empty() && opt->get_configurable()) {
std::string name = opt->get_lnames()[0];
// Non-flags
if(opt->get_type_size() != 0) {
// If the option was found on command line
if(opt->count() == 1)
j[name] = opt->results().at(0);
else if(opt->count() > 1)
j[name] = opt->results();
// If the option has a default and is requested by optional argument
else if(default_also && !opt->get_default_str().empty())
j[name] = opt->get_default_str();
// Flag, one passed
} else if(opt->count() == 1) {
j[name] = true;
// Flag, multiple passed
} else if(opt->count() > 1) {
j[name] = opt->count();
// Flag, not present
} else if(opt->count() == 0 && default_also) {
j[name] = false;
}
}
}
for(const CLI::App *subcom : app->get_subcommands({}))
j[subcom->get_name()] = json(to_config(subcom, default_also, false, ""));
return j.dump(4);
}
std::vector<CLI::ConfigItem> from_config(std::istream &input) const override {
json j;
input >> j;
return _from_config(j);
}
std::vector<CLI::ConfigItem>
_from_config(json j, std::string name = "", std::vector<std::string> prefix = {}) const {
std::vector<CLI::ConfigItem> results;
if(j.is_object()) {
for(json::iterator item = j.begin(); item != j.end(); ++item) {
auto copy_prefix = prefix;
if(!name.empty())
copy_prefix.push_back(name);
auto sub_results = _from_config(*item, item.key(), copy_prefix);
results.insert(results.end(), sub_results.begin(), sub_results.end());
}
} else if(!name.empty()) {
results.emplace_back();
CLI::ConfigItem &res = results.back();
res.name = name;
res.parents = prefix;
if(j.is_boolean()) {
res.inputs = {j.get<bool>() ? "true" : "false"};
} else if(j.is_number()) {
std::stringstream ss;
ss << j.get<double>();
res.inputs = {ss.str()};
} else if(j.is_string()) {
res.inputs = {j.get<std::string>()};
} else if(j.is_array()) {
for(std::string ival : j)
res.inputs.push_back(ival);
} else {
throw CLI::ConversionError("Failed to convert " + name);
}
} else {
throw CLI::ConversionError("You must make all top level values objects in json!");
}
return results;
}
};
int main(int argc, char **argv) {
CLI::App app;
app.config_formatter(std::make_shared<ConfigJSON>());
int item;
app.add_flag("--simple");
app.add_option("--item", item);
app.set_config("--config");
CLI11_PARSE(app, argc, argv);
std::cout << app.config_to_str(true, true) << std::endl;
}