ceph/src/tools/rbd/OptionPrinter.cc

   1 // -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
   2 // vim: ts=8 sw=2 smarttab
   3
   4 #include "tools/rbd/OptionPrinter.h"
   5 #include "tools/rbd/IndentStream.h"
   6
   7 namespace rbd {
   8
   9 namespace po = boost::program_options;
  10
  11 const std::string OptionPrinter::POSITIONAL_ARGUMENTS("Positional arguments");
  12 const std::string OptionPrinter::OPTIONAL_ARGUMENTS("Optional arguments");
  13
  14 const size_t OptionPrinter::MAX_DESCRIPTION_OFFSET;
  15
  16 OptionPrinter::OptionPrinter(const OptionsDescription &positional,
  17                              const OptionsDescription &optional)
  18   : m_positional(positional), m_optional(optional) {
  19 }
  20
  21 void OptionPrinter::print_short(std::ostream &os, size_t initial_offset) {
  22   size_t name_width = std::min(initial_offset, MAX_DESCRIPTION_OFFSET) + 1;
  23
  24   IndentStream indent_stream(name_width, initial_offset, LINE_WIDTH, os);
  25   indent_stream.set_delimiter("[");
  26   for (size_t i = 0; i < m_optional.options().size(); ++i) {
  27     bool required = m_optional.options()[i]->semantic()->is_required();
  28     if (!required) {
  29       indent_stream << "[";
  30     }
  31     indent_stream << "--" << m_optional.options()[i]->long_name();
  32     if (m_optional.options()[i]->semantic()->max_tokens() != 0) {
  33       indent_stream << " <" << m_optional.options()[i]->long_name() << ">";
  34     }
  35     if (!required) {
  36       indent_stream << "]";
  37     }
  38     indent_stream << " ";
  39   }
  40   indent_stream << std::endl;
  41
  42   if (m_positional.options().size() > 0) {
  43     indent_stream.set_delimiter(" ");
  44     for (size_t i = 0; i < m_positional.options().size(); ++i) {
  45       indent_stream << "<" << m_positional.options()[i]->long_name() << "> ";
  46       if (m_positional.options()[i]->semantic()->max_tokens() > 1) {
  47         indent_stream << "[<" << m_positional.options()[i]->long_name()
  48                       << "> ...]";
  49         break;
  50       }
  51     }
  52     indent_stream << std::endl;
  53   }
  54 }
  55
  56 void OptionPrinter::print_detailed(std::ostream &os) {
  57   std::string indent_prefix(2, ' ');
  58   size_t name_width = compute_name_width(indent_prefix.size());
  59
  60   if (m_positional.options().size() > 0) {
  61     std::cout << POSITIONAL_ARGUMENTS << std::endl;
  62     for (size_t i = 0; i < m_positional.options().size(); ++i) {
  63       std::stringstream ss;
  64       ss << indent_prefix << "<" << m_positional.options()[i]->long_name()
  65          << ">";
  66
  67       std::cout << ss.str();
  68       IndentStream indent_stream(name_width, ss.str().size(), LINE_WIDTH, os);
  69       indent_stream << m_positional.options()[i]->description() << std::endl;
  70     }
  71     std::cout << std::endl;
  72   }
  73
  74   if (m_optional.options().size() > 0) {
  75     std::cout << OPTIONAL_ARGUMENTS << std::endl;
  76     for (size_t i = 0; i < m_optional.options().size(); ++i) {
  77       std::stringstream ss;
  78       ss << indent_prefix
  79          << m_optional.options()[i]->format_name() << " "
  80          << m_optional.options()[i]->format_parameter();
  81
  82       std::cout << ss.str();
  83       IndentStream indent_stream(name_width, ss.str().size(), LINE_WIDTH, os);
  84       indent_stream << m_optional.options()[i]->description() << std::endl;
  85     }
  86     std::cout << std::endl;
  87   }
  88 }
  89
  90 size_t OptionPrinter::compute_name_width(size_t indent) {
  91   size_t width = MIN_NAME_WIDTH;
  92   std::vector<OptionsDescription> descs = {m_positional, m_optional};
  93   for (size_t desc_idx = 0; desc_idx < descs.size(); ++desc_idx) {
  94     const OptionsDescription &desc = descs[desc_idx];
  95     for (size_t opt_idx = 0; opt_idx < desc.options().size(); ++opt_idx) {
  96       size_t name_width = desc.options()[opt_idx]->format_name().size() +
  97                           desc.options()[opt_idx]->format_parameter().size()
  98                           + 1;
  99       width = std::max(width, name_width);
 100     }
 101   }
 102   width += indent;
 103   width = std::min(width, MAX_DESCRIPTION_OFFSET) + 1;
 104   return width;
 105 }
 106
 107 } // namespace rbd