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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,113 @@ | ||
| #include <CLI/CLI.hpp> | ||
| #include <nlohmann/json.hpp> | ||
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| // 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) | ||
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| using nlohmann::json; | ||
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| class ConfigJSON : public CLI::Config { | ||
| public: | ||
| std::string to_config(const CLI::App *app, bool default_also, bool, std::string) const override { | ||
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| json j; | ||
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| for(const CLI::Option *opt : app->get_options({})) { | ||
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| // Only process option with a long-name and configurable | ||
| if(!opt->get_lnames().empty() && opt->get_configurable()) { | ||
| std::string name = opt->get_lnames()[0]; | ||
|
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| // Non-flags | ||
| if(opt->get_type_size() != 0) { | ||
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| // 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(); | ||
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| // If the option has a default and is requested by optional argument | ||
| else if(default_also && !opt->get_defaultval().empty()) | ||
| j[name] = opt->get_defaultval(); | ||
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| // Flag, one passed | ||
| } else if(opt->count() == 1) { | ||
| j[name] = true; | ||
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| // Flag, multiple passed | ||
| } else if(opt->count() > 1) { | ||
| j[name] = opt->count(); | ||
|
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| // Flag, not present | ||
| } else if(opt->count() == 0 && default_also) { | ||
| j[name] = false; | ||
| } | ||
| } | ||
| } | ||
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| for(const CLI::App *subcom : app->get_subcommands({})) | ||
| j[subcom->get_name()] = json(to_config(subcom, default_also, false, "")); | ||
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| return j.dump(4); | ||
| } | ||
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| std::vector<CLI::ConfigItem> from_config(std::istream &input) const override { | ||
| json j; | ||
| input >> j; | ||
| return _from_config(j); | ||
| } | ||
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| std::vector<CLI::ConfigItem> | ||
| _from_config(json j, std::string name = "", std::vector<std::string> prefix = {}) const { | ||
| std::vector<CLI::ConfigItem> results; | ||
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| 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!"); | ||
| } | ||
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| return results; | ||
| } | ||
| }; | ||
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| int main(int argc, char **argv) { | ||
| CLI::App app; | ||
| app.config_formatter(std::make_shared<ConfigJSON>()); | ||
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| int item; | ||
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| app.add_flag("--simple"); | ||
| app.add_option("--item", item); | ||
| app.set_config("--config"); | ||
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| CLI11_PARSE(app, argc, argv); | ||
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| std::cout << app.config_to_str(true, true) << std::endl; | ||
| } |