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Merge pull request #33 from wtdcode/add-required-feature

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Add a 'required' feature
This commit is contained in:
Pranav Srinivas Kumar 2019-08-06 08:48:45 -05:00 committed by GitHub
commit e8dcc7e2c6
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1 changed files with 21 additions and 1 deletions
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22
include/argparse.hpp
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@ -102,6 +102,11 @@ public:
return *this;
}
Argument& required() {
mIsRequired = true;
return *this;
}
Argument& implicit_value(std::any aImplicitValue) {
mImplicitValue = std::move(aImplicitValue);
mNumArgs = 0;
@ -158,6 +163,16 @@ public:
}
else {
// TODO: check if an implicit value was programmed for this argument
if (!mIsUsed && !mDefaultValue.has_value() && mIsRequired) {
std::stringstream stream;
stream << "error: " << mNames[0] << ": required.";
throw std::runtime_error(stream.str());
}
if (mIsUsed && mIsRequired && mValues.size() == 0) {
std::stringstream stream;
stream << "error: " << mUsedName << ": no value provided.";
throw std::runtime_error(stream.str());
}
}
}
else {
@ -179,7 +194,11 @@ public:
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";
stream << nameStream.str() << "\t" << argument.mHelp;
if (argument.mIsRequired)
stream << "[Required]";
stream << "\n";
return stream;
}
@ -298,6 +317,7 @@ public:
std::vector<std::string> mRawValues;
size_t mNumArgs = 1;
bool mIsOptional = false;
bool mIsRequired = false;
bool mIsUsed = false; // relevant for optional arguments. True if used by user
public: