ConfigFwd.hpp
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#pragma once
// Distributed under the 3-Clause BSD License. See accompanying
// file LICENSE or https://github.com/CLIUtils/CLI11 for details.
#include <algorithm>
#include <fstream>
#include <iostream>
#include <string>
#include "CLI/StringTools.hpp"
namespace CLI {
class App;
namespace detail {
/// Comma separated join, adds quotes if needed
inline std::string ini_join(std::vector<std::string> args) {
std::ostringstream s;
size_t start = 0;
for(const auto &arg : args) {
if(start++ > 0)
s << " ";
auto it = std::find_if(arg.begin(), arg.end(), [](char ch) { return std::isspace<char>(ch, std::locale()); });
if(it == arg.end())
s << arg;
else if(arg.find_first_of('\"') == std::string::npos)
s << '\"' << arg << '\"';
else
s << '\'' << arg << '\'';
}
return s.str();
}
} // namespace detail
/// Holds values to load into Options
struct ConfigItem {
/// This is the list of parents
std::vector<std::string> parents;
/// This is the name
std::string name;
/// Listing of inputs
std::vector<std::string> inputs;
/// The list of parents and name joined by "."
std::string fullname() const {
std::vector<std::string> tmp = parents;
tmp.emplace_back(name);
return detail::join(tmp, ".");
}
};
/// This class provides a converter for configuration files.
class Config {
protected:
std::vector<ConfigItem> items;
public:
/// Convert an app into a configuration
virtual std::string to_config(const App *, bool, bool, std::string) const = 0;
/// Convert a configuration into an app
virtual std::vector<ConfigItem> from_config(std::istream &) const = 0;
/// Get a flag value
virtual std::string to_flag(const ConfigItem &item) const {
if(item.inputs.size() == 1) {
return item.inputs.at(0);
}
throw ConversionError::TooManyInputsFlag(item.fullname());
}
/// Parse a config file, throw an error (ParseError:ConfigParseError or FileError) on failure
std::vector<ConfigItem> from_file(const std::string &name) {
std::ifstream input{name};
if(!input.good())
throw FileError::Missing(name);
return from_config(input);
}
/// Virtual destructor
virtual ~Config() = default;
};
/// This converter works with INI files
class ConfigINI : public Config {
public:
std::string to_config(const App *, bool default_also, bool write_description, std::string prefix) const override;
std::vector<ConfigItem> from_config(std::istream &input) const override {
std::string line;
std::string section = "default";
std::vector<ConfigItem> output;
while(getline(input, line)) {
std::vector<std::string> items_buffer;
detail::trim(line);
size_t len = line.length();
if(len > 1 && line[0] == '[' && line[len - 1] == ']') {
section = line.substr(1, len - 2);
} else if(len > 0 && line[0] != ';') {
output.emplace_back();
ConfigItem &out = output.back();
// Find = in string, split and recombine
auto pos = line.find('=');
if(pos != std::string::npos) {
out.name = detail::trim_copy(line.substr(0, pos));
std::string item = detail::trim_copy(line.substr(pos + 1));
items_buffer = detail::split_up(item);
} else {
out.name = detail::trim_copy(line);
items_buffer = {"ON"};
}
if(detail::to_lower(section) != "default") {
out.parents = {section};
}
if(out.name.find('.') != std::string::npos) {
std::vector<std::string> plist = detail::split(out.name, '.');
out.name = plist.back();
plist.pop_back();
out.parents.insert(out.parents.end(), plist.begin(), plist.end());
}
out.inputs.insert(std::end(out.inputs), std::begin(items_buffer), std::end(items_buffer));
}
}
return output;
}
};
} // namespace CLI