46d4aa211f
This is useful in cases such as, e.g. (lldb) help NSString (the user meant type lookup) or (lldb) help kill (the user is looking for process kill) Fixes rdar://24868537 llvm-svn: 262271
280 lines
12 KiB
C++
280 lines
12 KiB
C++
//===-- CommandObjectHelp.cpp -----------------------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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// C Includes
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// C++ Includes
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// Other libraries and framework includes
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// Project includes
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#include "CommandObjectHelp.h"
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#include "lldb/Interpreter/CommandObjectMultiword.h"
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#include "lldb/Interpreter/CommandInterpreter.h"
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#include "lldb/Interpreter/Options.h"
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#include "lldb/Interpreter/CommandReturnObject.h"
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using namespace lldb;
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using namespace lldb_private;
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//-------------------------------------------------------------------------
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// CommandObjectHelp
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//-------------------------------------------------------------------------
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void
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CommandObjectHelp::GenerateAdditionalHelpAvenuesMessage (Stream *s,
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const char* command,
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const char* prefix,
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const char* subcommand,
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bool include_apropos,
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bool include_type_lookup)
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{
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if (s && command && *command)
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{
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s->Printf("'%s' is not a known command.\n", command);
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if (prefix && *prefix)
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{
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s->Printf("Try '%shelp' to see a current list of commands.\n", prefix);
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}
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else
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{
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s->PutCString("Try 'help' to see a current list of commands.\n");
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}
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if (include_apropos)
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{
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s->Printf("Try 'apropos %s' for a list of related commands.\n", subcommand ? subcommand : command);
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}
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if (include_type_lookup)
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{
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s->Printf("Try 'type lookup %s' for information on types, methods, functions, modules, etc.", subcommand ? subcommand : command);
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}
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}
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}
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CommandObjectHelp::CommandObjectHelp (CommandInterpreter &interpreter) :
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CommandObjectParsed (interpreter,
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"help",
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"Show a list of all debugger commands, or give details about specific commands.",
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"help [<cmd-name>]"), m_options (interpreter)
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{
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CommandArgumentEntry arg;
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CommandArgumentData command_arg;
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// Define the first (and only) variant of this arg.
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command_arg.arg_type = eArgTypeCommandName;
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command_arg.arg_repetition = eArgRepeatStar;
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// There is only one variant this argument could be; put it into the argument entry.
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arg.push_back (command_arg);
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// Push the data for the first argument into the m_arguments vector.
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m_arguments.push_back (arg);
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}
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CommandObjectHelp::~CommandObjectHelp() = default;
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OptionDefinition
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CommandObjectHelp::CommandOptions::g_option_table[] =
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{
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{ LLDB_OPT_SET_ALL, false, "hide-aliases", 'a', OptionParser::eNoArgument, nullptr, nullptr, 0, eArgTypeNone, "Hide aliases in the command list."},
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{ LLDB_OPT_SET_ALL, false, "hide-user-commands", 'u', OptionParser::eNoArgument, nullptr, nullptr, 0, eArgTypeNone, "Hide user-defined commands from the list."},
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{ LLDB_OPT_SET_ALL, false, "show-hidden-commands", 'h', OptionParser::eNoArgument, nullptr, nullptr, 0, eArgTypeNone, "Include commands prefixed with an underscore."},
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{ 0, false, nullptr, 0, 0, nullptr, nullptr, 0, eArgTypeNone, nullptr }
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};
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bool
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CommandObjectHelp::DoExecute (Args& command, CommandReturnObject &result)
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{
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CommandObject::CommandMap::iterator pos;
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CommandObject *cmd_obj;
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const size_t argc = command.GetArgumentCount ();
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// 'help' doesn't take any arguments, other than command names. If argc is 0, we show the user
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// all commands (aliases and user commands if asked for). Otherwise every argument must be the name of a command or a sub-command.
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if (argc == 0)
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{
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uint32_t cmd_types = CommandInterpreter::eCommandTypesBuiltin;
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if (m_options.m_show_aliases)
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cmd_types |= CommandInterpreter::eCommandTypesAliases;
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if (m_options.m_show_user_defined)
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cmd_types |= CommandInterpreter::eCommandTypesUserDef;
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if (m_options.m_show_hidden)
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cmd_types |= CommandInterpreter::eCommandTypesHidden;
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result.SetStatus (eReturnStatusSuccessFinishNoResult);
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m_interpreter.GetHelp (result, cmd_types); // General help
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}
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else
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{
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// Get command object for the first command argument. Only search built-in command dictionary.
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StringList matches;
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cmd_obj = m_interpreter.GetCommandObject (command.GetArgumentAtIndex (0), &matches);
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bool is_alias_command = m_interpreter.AliasExists (command.GetArgumentAtIndex (0));
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std::string alias_name = command.GetArgumentAtIndex(0);
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if (cmd_obj != nullptr)
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{
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StringList matches;
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bool all_okay = true;
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CommandObject *sub_cmd_obj = cmd_obj;
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// Loop down through sub_command dictionaries until we find the command object that corresponds
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// to the help command entered.
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std::string sub_command;
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for (size_t i = 1; i < argc && all_okay; ++i)
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{
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sub_command = command.GetArgumentAtIndex(i);
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matches.Clear();
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if (! sub_cmd_obj->IsMultiwordObject ())
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{
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all_okay = false;
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}
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else
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{
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CommandObject *found_cmd;
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found_cmd = sub_cmd_obj->GetSubcommandObject(sub_command.c_str(), &matches);
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if (found_cmd == nullptr)
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all_okay = false;
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else if (matches.GetSize() > 1)
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all_okay = false;
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else
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sub_cmd_obj = found_cmd;
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}
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}
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if (!all_okay || (sub_cmd_obj == nullptr))
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{
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std::string cmd_string;
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command.GetCommandString (cmd_string);
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if (matches.GetSize() >= 2)
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{
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StreamString s;
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s.Printf ("ambiguous command %s", cmd_string.c_str());
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size_t num_matches = matches.GetSize();
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for (size_t match_idx = 0; match_idx < num_matches; match_idx++)
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{
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s.Printf ("\n\t%s", matches.GetStringAtIndex(match_idx));
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}
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s.Printf ("\n");
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result.AppendError(s.GetData());
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result.SetStatus (eReturnStatusFailed);
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return false;
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}
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else if (!sub_cmd_obj)
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{
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StreamString error_msg_stream;
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GenerateAdditionalHelpAvenuesMessage(&error_msg_stream,
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cmd_string.c_str(),
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m_interpreter.GetCommandPrefix(),
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sub_command.c_str());
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result.AppendErrorWithFormat("%s",error_msg_stream.GetData());
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result.SetStatus (eReturnStatusFailed);
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return false;
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}
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else
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{
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GenerateAdditionalHelpAvenuesMessage(&result.GetOutputStream(),
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cmd_string.c_str(),
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m_interpreter.GetCommandPrefix(),
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sub_command.c_str());
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result.GetOutputStream().Printf("\nThe closest match is '%s'. Help on it follows.\n\n", sub_cmd_obj->GetCommandName());
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}
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}
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sub_cmd_obj->GenerateHelpText(result);
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if (is_alias_command)
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{
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StreamString sstr;
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m_interpreter.GetAliasHelp (alias_name.c_str(), cmd_obj->GetCommandName(), sstr);
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result.GetOutputStream().Printf ("\n'%s' is an abbreviation for %s\n", alias_name.c_str(), sstr.GetData());
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}
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}
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else if (matches.GetSize() > 0)
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{
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Stream &output_strm = result.GetOutputStream();
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output_strm.Printf("Help requested with ambiguous command name, possible completions:\n");
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const size_t match_count = matches.GetSize();
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for (size_t i = 0; i < match_count; i++)
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{
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output_strm.Printf("\t%s\n", matches.GetStringAtIndex(i));
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}
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}
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else
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{
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// Maybe the user is asking for help about a command argument rather than a command.
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const CommandArgumentType arg_type = CommandObject::LookupArgumentName (command.GetArgumentAtIndex (0));
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if (arg_type != eArgTypeLastArg)
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{
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Stream &output_strm = result.GetOutputStream ();
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CommandObject::GetArgumentHelp (output_strm, arg_type, m_interpreter);
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result.SetStatus (eReturnStatusSuccessFinishNoResult);
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}
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else
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{
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StreamString error_msg_stream;
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GenerateAdditionalHelpAvenuesMessage(&error_msg_stream, command.GetArgumentAtIndex(0), m_interpreter.GetCommandPrefix());
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result.AppendErrorWithFormat("%s",error_msg_stream.GetData());
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result.SetStatus (eReturnStatusFailed);
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}
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}
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}
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return result.Succeeded();
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}
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int
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CommandObjectHelp::HandleCompletion(Args &input,
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int &cursor_index,
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int &cursor_char_position,
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int match_start_point,
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int max_return_elements,
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bool &word_complete,
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StringList &matches)
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{
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// Return the completions of the commands in the help system:
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if (cursor_index == 0)
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{
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return m_interpreter.HandleCompletionMatches (input,
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cursor_index,
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cursor_char_position,
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match_start_point,
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max_return_elements,
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word_complete,
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matches);
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}
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else
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{
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CommandObject *cmd_obj = m_interpreter.GetCommandObject (input.GetArgumentAtIndex(0));
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// The command that they are getting help on might be ambiguous, in which case we should complete that,
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// otherwise complete with the command the user is getting help on...
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if (cmd_obj)
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{
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input.Shift();
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cursor_index--;
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return cmd_obj->HandleCompletion (input,
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cursor_index,
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cursor_char_position,
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match_start_point,
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max_return_elements,
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word_complete,
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matches);
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}
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else
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{
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return m_interpreter.HandleCompletionMatches (input,
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cursor_index,
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cursor_char_position,
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match_start_point,
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max_return_elements,
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word_complete,
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matches);
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}
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}
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}
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