NestedCommandLineAppExample.cpp File Reference

#include <folly/ScopeGuard.h>
#include <folly/String.h>
#include <folly/experimental/NestedCommandLineApp.h>
#include <folly/experimental/ProgramOptions.h>

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Functions
int	main (int argc, char *argv[])

Function Documentation

int main	(	int	argc,
		char *	argv[]
	)

Definition at line 166 of file NestedCommandLineAppExample.cpp.

References folly::NestedCommandLineApp::addCommand(), folly::NestedCommandLineApp::addGFlags(), and folly::NestedCommandLineApp::run().

                                 {
  // Initialize a NestedCommandLineApp object.
  //
  // The first argument is the program name -- an empty string will cause the
  // program name to be deduced from the executable name, which is usually
  // fine. The second argument is a version string.
  //
  // You may also add an "initialization function" that is always called
  // for every valid command before the command is executed.
  folly::NestedCommandLineApp app("", "0.1");

  // Add any GFlags-defined flags. These are global flags, and so they should
  // be valid for any command.
  app.addGFlags();

  // Add any commands. For our example, we'll implement simplified versions
  // of "cat" and "echo". Note that addCommand() returns a reference to a
  // boost::program_options object that you may use to add command-specific
  // options.
  // clang-format off
  app.addCommand(
      // command name
      "cat",

      // argument description
      "[file...]",

      // short help string
      "Concatenate files and print them on standard output",

      // Long help string
      "Concatenate files and print them on standard output.",

      // Function to execute
      runCat)
    .add_options()
      ("number,n", po::bool_switch(), "number all output lines");
  // clang-format on

  // clang-format off
  app.addCommand(
      "echo",
      "[string...]",
      "Display a line of text",
      "Display a line of text.",
      runEcho)
    .add_options()
      (",n", po::bool_switch(), "do not output the trailing newline");
  // clang-format on

  // You may also add command aliases -- that is, multiple command names
  // that do the same thing; see addAlias().

  // app.run returns an appropriate error code
  return app.run(argc, argv);
}