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Conditionally output all help groups on empty groups vector

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This commit is contained in:
Torben Jonas 2017-04-09 14:40:52 +02:00
parent 1be5f10daf
commit fdf7945935
1 changed files with 43 additions and 8 deletions
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51
include/cxxopts.hpp
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@ -793,6 +793,14 @@ namespace cxxopts
String
help_one_group(const std::string& group) const;
inline
void
generate_group_help(String& result, const std::vector<std::string>& groups) const;
inline
void
generate_all_groups_help(String& result) const;
std::string m_program;
String m_help_string;
@ -1362,6 +1370,35 @@ Options::help_one_group(const std::string& g) const
return result;
}
void
Options::generate_group_help(String& result, const std::vector<std::string>& groups) const
{
for (std::size_t i = 0; i < groups.size(); ++i)
{
String const& group_help = help_one_group(groups[i]);
if (empty(group_help)) continue;
result += group_help;
if (i < groups.size() - 1)
{
result += '\n';
}
}
}
void
Options::generate_all_groups_help(String& result) const
{
std::vector<std::string> groups;
groups.reserve(m_help.size());
for (auto& group : m_help)
{
groups.push_back(group.first);
}
generate_group_help(result, groups);
}
std::string
Options::help(const std::vector<std::string>& groups) const
{
@ -1374,15 +1411,13 @@ Options::help(const std::vector<std::string>& groups) const
result += "\n\n";
for (std::size_t i = 0; i < groups.size(); ++i)
if (groups.size() == 0)
{
String const& group_help = help_one_group(groups[i]);
if (empty(group_help)) continue;
result += group_help;
if (i < groups.size() - 1)
{
result += '\n';
}
generate_all_groups_help(result);
}
else
{
generate_group_help(result, groups);
}
return toUTF8String(result);