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 //===----------------------------------------------------------------------===//
10 #include "CommandObjectHelp.h"
11 #include "lldb/Interpreter/CommandInterpreter.h"
12 #include "lldb/Interpreter/CommandObjectMultiword.h"
13 #include "lldb/Interpreter/CommandReturnObject.h"
14 #include "lldb/Interpreter/Options.h"
17 using namespace lldb_private;
19 //-------------------------------------------------------------------------
21 //-------------------------------------------------------------------------
23 void CommandObjectHelp::GenerateAdditionalHelpAvenuesMessage(
24 Stream *s, llvm::StringRef command, llvm::StringRef prefix, llvm::StringRef subcommand,
25 bool include_apropos, bool include_type_lookup) {
26 if (!s || command.empty())
29 std::string command_str = command.str();
30 std::string prefix_str = prefix.str();
31 std::string subcommand_str = subcommand.str();
32 const std::string &lookup_str = !subcommand_str.empty() ? subcommand_str : command_str;
33 s->Printf("'%s' is not a known command.\n", command_str.c_str());
34 s->Printf("Try '%shelp' to see a current list of commands.\n",
35 prefix.str().c_str());
36 if (include_apropos) {
37 s->Printf("Try '%sapropos %s' for a list of related commands.\n",
38 prefix_str.c_str(), lookup_str.c_str());
40 if (include_type_lookup) {
41 s->Printf("Try '%stype lookup %s' for information on types, methods, "
42 "functions, modules, etc.",
43 prefix_str.c_str(), lookup_str.c_str());
47 CommandObjectHelp::CommandObjectHelp(CommandInterpreter &interpreter)
48 : CommandObjectParsed(interpreter, "help", "Show a list of all debugger "
49 "commands, or give details "
50 "about a specific command.",
53 CommandArgumentEntry arg;
54 CommandArgumentData command_arg;
56 // Define the first (and only) variant of this arg.
57 command_arg.arg_type = eArgTypeCommandName;
58 command_arg.arg_repetition = eArgRepeatStar;
60 // There is only one variant this argument could be; put it into the argument
62 arg.push_back(command_arg);
64 // Push the data for the first argument into the m_arguments vector.
65 m_arguments.push_back(arg);
68 CommandObjectHelp::~CommandObjectHelp() = default;
70 static constexpr OptionDefinition g_help_options[] = {
72 {LLDB_OPT_SET_ALL, false, "hide-aliases", 'a', OptionParser::eNoArgument, nullptr, {}, 0, eArgTypeNone, "Hide aliases in the command list."},
73 {LLDB_OPT_SET_ALL, false, "hide-user-commands", 'u', OptionParser::eNoArgument, nullptr, {}, 0, eArgTypeNone, "Hide user-defined commands from the list."},
74 {LLDB_OPT_SET_ALL, false, "show-hidden-commands", 'h', OptionParser::eNoArgument, nullptr, {}, 0, eArgTypeNone, "Include commands prefixed with an underscore."},
78 llvm::ArrayRef<OptionDefinition>
79 CommandObjectHelp::CommandOptions::GetDefinitions() {
80 return llvm::makeArrayRef(g_help_options);
83 bool CommandObjectHelp::DoExecute(Args &command, CommandReturnObject &result) {
84 CommandObject::CommandMap::iterator pos;
85 CommandObject *cmd_obj;
86 const size_t argc = command.GetArgumentCount();
88 // 'help' doesn't take any arguments, other than command names. If argc is
89 // 0, we show the user all commands (aliases and user commands if asked for).
90 // Otherwise every argument must be the name of a command or a sub-command.
92 uint32_t cmd_types = CommandInterpreter::eCommandTypesBuiltin;
93 if (m_options.m_show_aliases)
94 cmd_types |= CommandInterpreter::eCommandTypesAliases;
95 if (m_options.m_show_user_defined)
96 cmd_types |= CommandInterpreter::eCommandTypesUserDef;
97 if (m_options.m_show_hidden)
98 cmd_types |= CommandInterpreter::eCommandTypesHidden;
100 result.SetStatus(eReturnStatusSuccessFinishNoResult);
101 m_interpreter.GetHelp(result, cmd_types); // General help
103 // Get command object for the first command argument. Only search built-in
104 // command dictionary.
106 auto command_name = command[0].ref;
107 cmd_obj = m_interpreter.GetCommandObject(command_name, &matches);
109 if (cmd_obj != nullptr) {
111 bool all_okay = true;
112 CommandObject *sub_cmd_obj = cmd_obj;
113 // Loop down through sub_command dictionaries until we find the command
114 // object that corresponds to the help command entered.
115 std::string sub_command;
116 for (auto &entry : command.entries().drop_front()) {
117 sub_command = entry.ref;
119 if (sub_cmd_obj->IsAlias())
121 ((CommandAlias *)sub_cmd_obj)->GetUnderlyingCommand().get();
122 if (!sub_cmd_obj->IsMultiwordObject()) {
126 CommandObject *found_cmd;
128 sub_cmd_obj->GetSubcommandObject(sub_command.c_str(), &matches);
129 if (found_cmd == nullptr || matches.GetSize() > 1) {
133 sub_cmd_obj = found_cmd;
137 if (!all_okay || (sub_cmd_obj == nullptr)) {
138 std::string cmd_string;
139 command.GetCommandString(cmd_string);
140 if (matches.GetSize() >= 2) {
142 s.Printf("ambiguous command %s", cmd_string.c_str());
143 size_t num_matches = matches.GetSize();
144 for (size_t match_idx = 0; match_idx < num_matches; match_idx++) {
145 s.Printf("\n\t%s", matches.GetStringAtIndex(match_idx));
148 result.AppendError(s.GetString());
149 result.SetStatus(eReturnStatusFailed);
151 } else if (!sub_cmd_obj) {
152 StreamString error_msg_stream;
153 GenerateAdditionalHelpAvenuesMessage(
154 &error_msg_stream, cmd_string.c_str(),
155 m_interpreter.GetCommandPrefix(), sub_command.c_str());
156 result.AppendError(error_msg_stream.GetString());
157 result.SetStatus(eReturnStatusFailed);
160 GenerateAdditionalHelpAvenuesMessage(
161 &result.GetOutputStream(), cmd_string.c_str(),
162 m_interpreter.GetCommandPrefix(), sub_command.c_str());
163 result.GetOutputStream().Printf(
164 "\nThe closest match is '%s'. Help on it follows.\n\n",
165 sub_cmd_obj->GetCommandName().str().c_str());
169 sub_cmd_obj->GenerateHelpText(result);
170 std::string alias_full_name;
171 // Don't use AliasExists here, that only checks exact name matches. If
172 // the user typed a shorter unique alias name, we should still tell them
174 if (m_interpreter.GetAliasFullName(command_name, alias_full_name)) {
176 m_interpreter.GetAlias(alias_full_name)->GetAliasExpansion(sstr);
177 result.GetOutputStream().Printf("\n'%s' is an abbreviation for %s\n",
178 command[0].c_str(), sstr.GetData());
180 } else if (matches.GetSize() > 0) {
181 Stream &output_strm = result.GetOutputStream();
182 output_strm.Printf("Help requested with ambiguous command name, possible "
184 const size_t match_count = matches.GetSize();
185 for (size_t i = 0; i < match_count; i++) {
186 output_strm.Printf("\t%s\n", matches.GetStringAtIndex(i));
189 // Maybe the user is asking for help about a command argument rather than
191 const CommandArgumentType arg_type =
192 CommandObject::LookupArgumentName(command_name);
193 if (arg_type != eArgTypeLastArg) {
194 Stream &output_strm = result.GetOutputStream();
195 CommandObject::GetArgumentHelp(output_strm, arg_type, m_interpreter);
196 result.SetStatus(eReturnStatusSuccessFinishNoResult);
198 StreamString error_msg_stream;
199 GenerateAdditionalHelpAvenuesMessage(&error_msg_stream, command_name,
200 m_interpreter.GetCommandPrefix(),
202 result.AppendError(error_msg_stream.GetString());
203 result.SetStatus(eReturnStatusFailed);
208 return result.Succeeded();
211 int CommandObjectHelp::HandleCompletion(CompletionRequest &request) {
212 // Return the completions of the commands in the help system:
213 if (request.GetCursorIndex() == 0) {
214 return m_interpreter.HandleCompletionMatches(request);
216 CommandObject *cmd_obj =
217 m_interpreter.GetCommandObject(request.GetParsedLine()[0].ref);
219 // The command that they are getting help on might be ambiguous, in which
220 // case we should complete that, otherwise complete with the command the
221 // user is getting help on...
224 request.GetParsedLine().Shift();
225 request.SetCursorIndex(request.GetCursorIndex() - 1);
226 return cmd_obj->HandleCompletion(request);
228 return m_interpreter.HandleCompletionMatches(request);