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Merge pull request #21 from svanveen/fix/print-help

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Do some refactoring of print_help to resolve strong binding of ArgumentParser and Argument
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Pranav Srinivas Kumar 2019-05-25 21:07:25 -04:00 committed by GitHub
commit 369cd551ac
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1 changed files with 32 additions and 54 deletions
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84
include/argparse.hpp
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@ -41,6 +41,8 @@ SOFTWARE.
#include <sstream>
#include <stdexcept>
#include <numeric>
#include <iomanip>
#include <iterator>
namespace argparse {
@ -84,7 +86,11 @@ public:
explicit Argument(Args... args)
: mNames({std::move(args)...})
, mIsOptional((is_optional(args) || ...))
{}
{
std::sort(mNames.begin(), mNames.end(), [](const auto& lhs, const auto& rhs) {
return lhs.size() == rhs.size() ? lhs < rhs : lhs.size() < rhs.size();
});
}
Argument& help(std::string aHelp) {
mHelp = std::move(aHelp);
@ -164,6 +170,18 @@ public:
}
}
size_t get_arguments_length() const {
return std::accumulate(std::begin(mNames), std::end(mNames), size_t(0), [](const auto& sum, const auto& s) {
return sum + s.size() + 1; // +1 for space between names
});
}
friend std::ostream& operator<<(std::ostream& stream, const Argument& argument) {
std::stringstream nameStream;
std::copy(std::begin(argument.mNames), std::end(argument.mNames), std::ostream_iterator<std::string>(nameStream, " "));
return stream << nameStream.str() << "\t" << argument.mHelp << "\n";
}
template <typename T>
bool operator!=(const T& aRhs) const {
@ -362,65 +380,29 @@ class ArgumentParser {
// TODO: support user-defined help and usage messages for the ArgumentParser
std::string print_help() {
std::stringstream stream;
stream << std::left;
stream << "Usage: " << mProgramName << " [options] ";
size_t tLongestArgumentLength = get_length_of_longest_argument();
for (size_t i = 0; i < mPositionalArguments.size(); i++) {
auto tNames = mPositionalArguments[i]->mNames;
stream << (i == 0 ? " " : "") << tNames[0] << " ";
for (const auto& argument : mPositionalArguments) {
stream << argument->mNames.front() << " ";
}
stream << "\n\n";
if (!mPositionalArguments.empty())
stream << "Positional arguments:\n";
for (const auto& mPositionalArgument : mPositionalArguments) {
size_t tCurrentLength = 0;
auto tNames = mPositionalArgument->mNames;
for (size_t j = 0; j < tNames.size() - 1; j++) {
auto tCurrentName = tNames[j];
stream << tCurrentName;
stream << ", ";
tCurrentLength += tCurrentName.length() + 2;
}
stream << tNames[tNames.size() - 1];
tCurrentLength += tNames[tNames.size() - 1].length();
if (tCurrentLength < tLongestArgumentLength)
stream << std::string((tLongestArgumentLength - tCurrentLength) + 2, ' ');
else if (tCurrentLength == tLongestArgumentLength)
stream << std::string(2, ' ');
else
stream << std::string((tCurrentLength - tLongestArgumentLength) + 2, ' ');
stream << mPositionalArgument->mHelp << "\n";
stream.width(tLongestArgumentLength);
stream << *mPositionalArgument;
}
if (!mOptionalArguments.empty() && !mPositionalArguments.empty())
stream << "\nOptional arguments:\n";
else if (!mOptionalArguments.empty())
stream << "Optional arguments:\n";
if (!mOptionalArguments.empty())
stream << (mPositionalArguments.empty() ? "" : "\n") << "Optional arguments:\n";
for (const auto & mOptionalArgument : mOptionalArguments) {
size_t tCurrentLength = 0;
auto tNames = mOptionalArgument->mNames;
std::sort(tNames.begin(), tNames.end(),
[](const std::string& lhs, const std::string& rhs) {
return lhs.size() == rhs.size() ? lhs < rhs : lhs.size() < rhs.size();
});
for (size_t j = 0; j < tNames.size() - 1; j++) {
auto tCurrentName = tNames[j];
stream << tCurrentName;
stream << ", ";
tCurrentLength += tCurrentName.length() + 2;
}
stream << tNames[tNames.size() - 1];
tCurrentLength += tNames[tNames.size() - 1].length();
if (tCurrentLength < tLongestArgumentLength)
stream << std::string((tLongestArgumentLength - tCurrentLength) + 2, ' ');
else if (tCurrentLength == tLongestArgumentLength)
stream << std::string(2, ' ');
else
stream << std::string((tCurrentLength - tLongestArgumentLength) + 2, ' ');
stream << mOptionalArgument->mHelp << "\n";
stream.width(tLongestArgumentLength);
stream << *mOptionalArgument;
}
std::cout << stream.str();
@ -493,11 +475,7 @@ class ArgumentParser {
std::vector<size_t> argumentLengths(mArgumentMap.size());
std::transform(std::begin(mArgumentMap), std::end(mArgumentMap), std::begin(argumentLengths), [](const auto& argPair) {
const auto& [key, arg] = argPair;
const auto& names = arg->mNames;
auto maxLength = std::accumulate(std::begin(names), std::end(names), std::string::size_type{0}, [](const auto& sum, const auto& s) {
return sum + s.size() + 2; // +2 for ", "
});
return maxLength - 2; // -2 since the last one doesn't need ", "
return arg->get_arguments_length();
});
return *std::max_element(std::begin(argumentLengths), std::end(argumentLengths));
}