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//===-- CommandObjectHelp.cpp -----------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "lldb/lldb-python.h"
#include "CommandObjectHelp.h"
// C Includes
// C++ Includes
// Other libraries and framework includes
// Project includes
#include "lldb/Interpreter/CommandObjectMultiword.h"
#include "lldb/Interpreter/CommandInterpreter.h"
#include "lldb/Interpreter/Options.h"
#include "lldb/Interpreter/CommandReturnObject.h"
using namespace lldb;
using namespace lldb_private;
//-------------------------------------------------------------------------
// CommandObjectHelp
//-------------------------------------------------------------------------
CommandObjectHelp::CommandObjectHelp (CommandInterpreter &interpreter) :
CommandObjectParsed (interpreter,
"help",
"Show a list of all debugger commands, or give details about specific commands.",
"help [<cmd-name>]"), m_options (interpreter)
{
CommandArgumentEntry arg;
CommandArgumentData command_arg;
// Define the first (and only) variant of this arg.
command_arg.arg_type = eArgTypeCommandName;
command_arg.arg_repetition = eArgRepeatStar;
// There is only one variant this argument could be; put it into the argument entry.
arg.push_back (command_arg);
// Push the data for the first argument into the m_arguments vector.
m_arguments.push_back (arg);
}
CommandObjectHelp::~CommandObjectHelp()
{
}
OptionDefinition
CommandObjectHelp::CommandOptions::g_option_table[] =
{
{ LLDB_OPT_SET_ALL, false, "show-aliases", 'a', OptionParser::eNoArgument, NULL, NULL, 0, eArgTypeNone, "Show aliases in the command list."},
{ LLDB_OPT_SET_ALL, false, "hide-user-commands", 'u', OptionParser::eNoArgument, NULL, NULL, 0, eArgTypeNone, "Hide user-defined commands from the list."},
{ 0, false, NULL, 0, 0, NULL, NULL, 0, eArgTypeNone, NULL }
};
bool
CommandObjectHelp::DoExecute (Args& command, CommandReturnObject &result)
{
CommandObject::CommandMap::iterator pos;
CommandObject *cmd_obj;
const size_t argc = command.GetArgumentCount ();
// 'help' doesn't take any arguments, other than command names. If argc is 0, we show the user
// all commands (aliases and user commands if asked for). Otherwise every argument must be the name of a command or a sub-command.
if (argc == 0)
{
uint32_t cmd_types = CommandInterpreter::eCommandTypesBuiltin;
if (m_options.m_show_aliases)
cmd_types |= CommandInterpreter::eCommandTypesAliases;
if (m_options.m_show_user_defined)
cmd_types |= CommandInterpreter::eCommandTypesUserDef;
result.SetStatus (eReturnStatusSuccessFinishNoResult);
m_interpreter.GetHelp (result, cmd_types); // General help
}
else
{
// Get command object for the first command argument. Only search built-in command dictionary.
StringList matches;
cmd_obj = m_interpreter.GetCommandObject (command.GetArgumentAtIndex (0), &matches);
bool is_alias_command = m_interpreter.AliasExists (command.GetArgumentAtIndex (0));
std::string alias_name = command.GetArgumentAtIndex(0);
if (cmd_obj != NULL)
{
StringList matches;
bool all_okay = true;
CommandObject *sub_cmd_obj = cmd_obj;
// Loop down through sub_command dictionaries until we find the command object that corresponds
// to the help command entered.
for (size_t i = 1; i < argc && all_okay; ++i)
{
std::string sub_command = command.GetArgumentAtIndex(i);
matches.Clear();
if (! sub_cmd_obj->IsMultiwordObject ())
{
all_okay = false;
}
else
{
CommandObject *found_cmd;
found_cmd = sub_cmd_obj->GetSubcommandObject(sub_command.c_str(), &matches);
if (found_cmd == NULL)
all_okay = false;
else if (matches.GetSize() > 1)
all_okay = false;
else
sub_cmd_obj = found_cmd;
}
}
if (!all_okay || (sub_cmd_obj == NULL))
{
std::string cmd_string;
command.GetCommandString (cmd_string);
if (matches.GetSize() >= 2)
{
StreamString s;
s.Printf ("ambiguous command %s", cmd_string.c_str());
size_t num_matches = matches.GetSize();
for (size_t match_idx = 0; match_idx < num_matches; match_idx++)
{
s.Printf ("\n\t%s", matches.GetStringAtIndex(match_idx));
}
s.Printf ("\n");
result.AppendError(s.GetData());
result.SetStatus (eReturnStatusFailed);
return false;
}
else if (!sub_cmd_obj)
{
result.AppendErrorWithFormat("'%s' is not a known command.\n"
"Try 'help' to see a current list of commands.\n",
cmd_string.c_str());
result.SetStatus (eReturnStatusFailed);
return false;
}
else
{
result.GetOutputStream().Printf("'%s' is not a known command.\n"
"Try 'help' to see a current list of commands.\n"
"The closest match is '%s'. Help on it follows.\n\n",
cmd_string.c_str(),
sub_cmd_obj->GetCommandName());
}
}
sub_cmd_obj->GenerateHelpText(result);
if (is_alias_command)
{
StreamString sstr;
m_interpreter.GetAliasHelp (alias_name.c_str(), cmd_obj->GetCommandName(), sstr);
result.GetOutputStream().Printf ("\n'%s' is an abbreviation for %s\n", alias_name.c_str(), sstr.GetData());
}
}
else if (matches.GetSize() > 0)
{
Stream &output_strm = result.GetOutputStream();
output_strm.Printf("Help requested with ambiguous command name, possible completions:\n");
const size_t match_count = matches.GetSize();
for (size_t i = 0; i < match_count; i++)
{
output_strm.Printf("\t%s\n", matches.GetStringAtIndex(i));
}
}
else
{
// Maybe the user is asking for help about a command argument rather than a command.
const CommandArgumentType arg_type = CommandObject::LookupArgumentName (command.GetArgumentAtIndex (0));
if (arg_type != eArgTypeLastArg)
{
Stream &output_strm = result.GetOutputStream ();
CommandObject::GetArgumentHelp (output_strm, arg_type, m_interpreter);
result.SetStatus (eReturnStatusSuccessFinishNoResult);
}
else
{
result.AppendErrorWithFormat
("'%s' is not a known command.\nTry 'help' to see a current list of commands.\n",
command.GetArgumentAtIndex(0));
result.SetStatus (eReturnStatusFailed);
}
}
}
return result.Succeeded();
}
int
CommandObjectHelp::HandleCompletion
(
Args &input,
int &cursor_index,
int &cursor_char_position,
int match_start_point,
int max_return_elements,
bool &word_complete,
StringList &matches
)
{
// Return the completions of the commands in the help system:
if (cursor_index == 0)
{
return m_interpreter.HandleCompletionMatches (input,
cursor_index,
cursor_char_position,
match_start_point,
max_return_elements,
word_complete,
matches);
}
else
{
CommandObject *cmd_obj = m_interpreter.GetCommandObject (input.GetArgumentAtIndex(0));
// The command that they are getting help on might be ambiguous, in which case we should complete that,
// otherwise complete with the command the user is getting help on...
if (cmd_obj)
{
input.Shift();
cursor_index--;
return cmd_obj->HandleCompletion (input,
cursor_index,
cursor_char_position,
match_start_point,
max_return_elements,
word_complete,
matches);
}
else
{
return m_interpreter.HandleCompletionMatches (input,
cursor_index,
cursor_char_position,
match_start_point,
max_return_elements,
word_complete,
matches);
}
}
}
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