1 files changed, 161 insertions, 0 deletions
diff --git a/src/tools/rbd/OptionPrinter.cc b/src/tools/rbd/OptionPrinter.cc
new file mode 100644
index 000000000..0fea6b691
--- /dev/null
+++ b/src/tools/rbd/OptionPrinter.cc
@@ -0,0 +1,161 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#include "tools/rbd/OptionPrinter.h"
+#include "tools/rbd/IndentStream.h"
+#include "include/ceph_assert.h"
+
+namespace rbd {
+
+namespace po = boost::program_options;
+
+const std::string OptionPrinter::POSITIONAL_ARGUMENTS("Positional arguments");
+const std::string OptionPrinter::OPTIONAL_ARGUMENTS("Optional arguments");
+
+const size_t OptionPrinter::MAX_DESCRIPTION_OFFSET;
+
+OptionPrinter::OptionPrinter(const OptionsDescription &positional,
+                             const OptionsDescription &optional)
+  : m_positional(positional), m_optional(optional) {
+}
+
+void OptionPrinter::print_short(std::ostream &os, size_t initial_offset) {
+  size_t max_option_width = 0;
+  std::vector<std::string> optionals;
+  for (size_t i = 0; i < m_optional.options().size(); ++i) {
+    std::stringstream option;
+
+    bool required = m_optional.options()[i]->semantic()->is_required();
+    if (!required) {
+      option << "[";
+    }
+    option << "--" << m_optional.options()[i]->long_name();
+    if (m_optional.options()[i]->semantic()->max_tokens() != 0) {
+      option << " <" << m_optional.options()[i]->long_name() << ">";
+    }
+    if (!required) {
+      option << "]";
+    }
+    max_option_width = std::max(max_option_width, option.str().size());
+    optionals.emplace_back(option.str());
+  }
+
+  std::vector<std::string> positionals;
+  for (size_t i = 0; i < m_positional.options().size(); ++i) {
+    std::stringstream option;
+
+    // we overload po::value<std::string>()->default_value("") to signify
+    // an optional positional argument (purely for help printing purposes)
+    boost::any v;
+    bool required = !m_positional.options()[i]->semantic()->apply_default(v);
+    if (!required) {
+      auto ptr = boost::any_cast<std::string>(&v);
+      ceph_assert(ptr && ptr->empty());
+      option << "[";
+    }
+    option << "<" << m_positional.options()[i]->long_name() << ">";
+    if (m_positional.options()[i]->semantic()->max_tokens() > 1) {
+      option << " [<" << m_positional.options()[i]->long_name() << "> ...]";
+    }
+    if (!required) {
+      option << "]";
+    }
+
+    max_option_width = std::max(max_option_width, option.str().size());
+    positionals.emplace_back(option.str());
+
+    if (m_positional.options()[i]->semantic()->max_tokens() > 1) {
+      break;
+    }
+  }
+
+  size_t indent = std::min(initial_offset, MAX_DESCRIPTION_OFFSET) + 1;
+  if (indent + max_option_width + 2 > LINE_WIDTH) {
+    // decrease the indent so that we don't wrap past the end of the line
+    indent = LINE_WIDTH - max_option_width - 2;
+  }
+
+  IndentStream indent_stream(indent, initial_offset, LINE_WIDTH, os);
+  indent_stream.set_delimiter("[");
+  for (auto& option : optionals) {
+    indent_stream << option << " ";
+  }
+
+  if (optionals.size() > 0 || positionals.size() == 0) {
+    indent_stream << std::endl;
+  }
+
+  if (positionals.size() > 0) {
+    indent_stream.set_delimiter(" ");
+    for (auto& option : positionals) {
+      indent_stream << option << " ";
+    }
+    indent_stream << std::endl;
+  }
+}
+
+void OptionPrinter::print_optional(const OptionsDescription &global_opts,
+                                   size_t &name_width, std::ostream &os) {
+  std::string indent2(2, ' ');
+
+  for (size_t i = 0; i < global_opts.options().size(); ++i) {
+    std::string description = global_opts.options()[i]->description();
+    auto result = boost::find_first(description, "deprecated");
+    if (!result.empty()) {
+      continue;
+    }
+    std::stringstream ss;
+    ss << indent2
+       << global_opts.options()[i]->format_name() << " "
+       << global_opts.options()[i]->format_parameter();
+
+    std::cout << ss.str();
+    IndentStream indent_stream(name_width, ss.str().size(), LINE_WIDTH, std::cout);
+    indent_stream << global_opts.options()[i]->description() << std::endl;
+  }
+
+}
+
+void OptionPrinter::print_detailed(std::ostream &os) {
+  std::string indent_prefix(2, ' ');
+  size_t name_width = compute_name_width(indent_prefix.size());
+
+  if (m_positional.options().size() > 0) {
+    std::cout << POSITIONAL_ARGUMENTS << std::endl;
+    for (size_t i = 0; i < m_positional.options().size(); ++i) {
+      std::stringstream ss;
+      ss << indent_prefix << "<" << m_positional.options()[i]->long_name()
+         << ">";
+
+      std::cout << ss.str();
+      IndentStream indent_stream(name_width, ss.str().size(), LINE_WIDTH, os);
+      indent_stream << m_positional.options()[i]->description() << std::endl;
+    }
+    std::cout << std::endl;
+  }
+
+  if (m_optional.options().size() > 0) {
+    std::cout << OPTIONAL_ARGUMENTS << std::endl;
+    print_optional(m_optional, name_width, os);
+    std::cout << std::endl;
+  }
+}
+
+size_t OptionPrinter::compute_name_width(size_t indent) {
+  size_t width = MIN_NAME_WIDTH;
+  std::vector<OptionsDescription> descs = {m_positional, m_optional};
+  for (size_t desc_idx = 0; desc_idx < descs.size(); ++desc_idx) {
+    const OptionsDescription &desc = descs[desc_idx];
+    for (size_t opt_idx = 0; opt_idx < desc.options().size(); ++opt_idx) {
+      size_t name_width = desc.options()[opt_idx]->format_name().size() +
+                          desc.options()[opt_idx]->format_parameter().size()
+                          + 1;
+      width = std::max(width, name_width);
+    }
+  }
+  width += indent;
+  width = std::min(width, MAX_DESCRIPTION_OFFSET) + 1;
+  return width;
+}
+
+} // namespace rbd