1 //===-- CommandObjectHelp.cpp -----------------------------------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
12 // Other libraries and framework includes
14 #include "CommandObjectHelp.h"
15 #include "lldb/Interpreter/CommandInterpreter.h"
16 #include "lldb/Interpreter/CommandObjectMultiword.h"
17 #include "lldb/Interpreter/CommandReturnObject.h"
18 #include "lldb/Interpreter/Options.h"
21 using namespace lldb_private;
23 //-------------------------------------------------------------------------
25 //-------------------------------------------------------------------------
27 void CommandObjectHelp::GenerateAdditionalHelpAvenuesMessage(
28 Stream *s, llvm::StringRef command, llvm::StringRef prefix, llvm::StringRef subcommand,
29 bool include_apropos, bool include_type_lookup) {
30 if (!s || command.empty())
33 std::string command_str = command.str();
34 std::string prefix_str = prefix.str();
35 std::string subcommand_str = subcommand.str();
36 const std::string &lookup_str = !subcommand_str.empty() ? subcommand_str : command_str;
37 s->Printf("'%s' is not a known command.\n", command_str.c_str());
38 s->Printf("Try '%shelp' to see a current list of commands.\n",
39 prefix.str().c_str());
40 if (include_apropos) {
41 s->Printf("Try '%sapropos %s' for a list of related commands.\n",
42 prefix_str.c_str(), lookup_str.c_str());
44 if (include_type_lookup) {
45 s->Printf("Try '%stype lookup %s' for information on types, methods, "
46 "functions, modules, etc.",
47 prefix_str.c_str(), lookup_str.c_str());
51 CommandObjectHelp::CommandObjectHelp(CommandInterpreter &interpreter)
52 : CommandObjectParsed(interpreter, "help", "Show a list of all debugger "
53 "commands, or give details "
54 "about a specific command.",
57 CommandArgumentEntry arg;
58 CommandArgumentData command_arg;
60 // Define the first (and only) variant of this arg.
61 command_arg.arg_type = eArgTypeCommandName;
62 command_arg.arg_repetition = eArgRepeatStar;
64 // There is only one variant this argument could be; put it into the argument
66 arg.push_back(command_arg);
68 // Push the data for the first argument into the m_arguments vector.
69 m_arguments.push_back(arg);
72 CommandObjectHelp::~CommandObjectHelp() = default;
74 static OptionDefinition g_help_options[] = {
76 {LLDB_OPT_SET_ALL, false, "hide-aliases", 'a', OptionParser::eNoArgument, nullptr, nullptr, 0, eArgTypeNone, "Hide aliases in the command list."},
77 {LLDB_OPT_SET_ALL, false, "hide-user-commands", 'u', OptionParser::eNoArgument, nullptr, nullptr, 0, eArgTypeNone, "Hide user-defined commands from the list."},
78 {LLDB_OPT_SET_ALL, false, "show-hidden-commands", 'h', OptionParser::eNoArgument, nullptr, nullptr, 0, eArgTypeNone, "Include commands prefixed with an underscore."},
82 llvm::ArrayRef<OptionDefinition>
83 CommandObjectHelp::CommandOptions::GetDefinitions() {
84 return llvm::makeArrayRef(g_help_options);
87 bool CommandObjectHelp::DoExecute(Args &command, CommandReturnObject &result) {
88 CommandObject::CommandMap::iterator pos;
89 CommandObject *cmd_obj;
90 const size_t argc = command.GetArgumentCount();
92 // 'help' doesn't take any arguments, other than command names. If argc is
93 // 0, we show the user all commands (aliases and user commands if asked for).
94 // Otherwise every argument must be the name of a command or a sub-command.
96 uint32_t cmd_types = CommandInterpreter::eCommandTypesBuiltin;
97 if (m_options.m_show_aliases)
98 cmd_types |= CommandInterpreter::eCommandTypesAliases;
99 if (m_options.m_show_user_defined)
100 cmd_types |= CommandInterpreter::eCommandTypesUserDef;
101 if (m_options.m_show_hidden)
102 cmd_types |= CommandInterpreter::eCommandTypesHidden;
104 result.SetStatus(eReturnStatusSuccessFinishNoResult);
105 m_interpreter.GetHelp(result, cmd_types); // General help
107 // Get command object for the first command argument. Only search built-in
108 // command dictionary.
110 auto command_name = command[0].ref;
111 cmd_obj = m_interpreter.GetCommandObject(command_name, &matches);
113 if (cmd_obj != nullptr) {
115 bool all_okay = true;
116 CommandObject *sub_cmd_obj = cmd_obj;
117 // Loop down through sub_command dictionaries until we find the command
118 // object that corresponds to the help command entered.
119 std::string sub_command;
120 for (auto &entry : command.entries().drop_front()) {
121 sub_command = entry.ref;
123 if (sub_cmd_obj->IsAlias())
125 ((CommandAlias *)sub_cmd_obj)->GetUnderlyingCommand().get();
126 if (!sub_cmd_obj->IsMultiwordObject()) {
130 CommandObject *found_cmd;
132 sub_cmd_obj->GetSubcommandObject(sub_command.c_str(), &matches);
133 if (found_cmd == nullptr || matches.GetSize() > 1) {
137 sub_cmd_obj = found_cmd;
141 if (!all_okay || (sub_cmd_obj == nullptr)) {
142 std::string cmd_string;
143 command.GetCommandString(cmd_string);
144 if (matches.GetSize() >= 2) {
146 s.Printf("ambiguous command %s", cmd_string.c_str());
147 size_t num_matches = matches.GetSize();
148 for (size_t match_idx = 0; match_idx < num_matches; match_idx++) {
149 s.Printf("\n\t%s", matches.GetStringAtIndex(match_idx));
152 result.AppendError(s.GetString());
153 result.SetStatus(eReturnStatusFailed);
155 } else if (!sub_cmd_obj) {
156 StreamString error_msg_stream;
157 GenerateAdditionalHelpAvenuesMessage(
158 &error_msg_stream, cmd_string.c_str(),
159 m_interpreter.GetCommandPrefix(), sub_command.c_str());
160 result.AppendError(error_msg_stream.GetString());
161 result.SetStatus(eReturnStatusFailed);
164 GenerateAdditionalHelpAvenuesMessage(
165 &result.GetOutputStream(), cmd_string.c_str(),
166 m_interpreter.GetCommandPrefix(), sub_command.c_str());
167 result.GetOutputStream().Printf(
168 "\nThe closest match is '%s'. Help on it follows.\n\n",
169 sub_cmd_obj->GetCommandName().str().c_str());
173 sub_cmd_obj->GenerateHelpText(result);
175 if (m_interpreter.AliasExists(command_name)) {
177 m_interpreter.GetAlias(command_name)->GetAliasExpansion(sstr);
178 result.GetOutputStream().Printf("\n'%s' is an abbreviation for %s\n",
179 command[0].c_str(), sstr.GetData());
181 } else if (matches.GetSize() > 0) {
182 Stream &output_strm = result.GetOutputStream();
183 output_strm.Printf("Help requested with ambiguous command name, possible "
185 const size_t match_count = matches.GetSize();
186 for (size_t i = 0; i < match_count; i++) {
187 output_strm.Printf("\t%s\n", matches.GetStringAtIndex(i));
190 // Maybe the user is asking for help about a command argument rather than
192 const CommandArgumentType arg_type =
193 CommandObject::LookupArgumentName(command_name);
194 if (arg_type != eArgTypeLastArg) {
195 Stream &output_strm = result.GetOutputStream();
196 CommandObject::GetArgumentHelp(output_strm, arg_type, m_interpreter);
197 result.SetStatus(eReturnStatusSuccessFinishNoResult);
199 StreamString error_msg_stream;
200 GenerateAdditionalHelpAvenuesMessage(&error_msg_stream, command_name,
201 m_interpreter.GetCommandPrefix(),
203 result.AppendError(error_msg_stream.GetString());
204 result.SetStatus(eReturnStatusFailed);
209 return result.Succeeded();
212 int CommandObjectHelp::HandleCompletion(CompletionRequest &request) {
213 // Return the completions of the commands in the help system:
214 if (request.GetCursorIndex() == 0) {
215 return m_interpreter.HandleCompletionMatches(request);
217 CommandObject *cmd_obj =
218 m_interpreter.GetCommandObject(request.GetParsedLine()[0].ref);
220 // The command that they are getting help on might be ambiguous, in which
221 // case we should complete that, otherwise complete with the command the
222 // user is getting help on...
225 request.GetParsedLine().Shift();
226 request.SetCursorIndex(request.GetCursorIndex() - 1);
227 return cmd_obj->HandleCompletion(request);
229 return m_interpreter.HandleCompletionMatches(request);