Method help

src/rpc/server.cpp:123–183

}

std::string CRPCTable::help(const Config &config, const std::string &strCommand,
                            const JSONRPCRequest &helpreq) const {
    std::string strRet;
    std::string category;
    std::set<intptr_t> setDone;
    std::vector<std::pair<std::string, const CRPCCommand *>> vCommands;
    vCommands.reserve(mapCommands.size());

    for (const auto &entry : mapCommands) {
        vCommands.push_back(
            std::make_pair(entry.second.front()->category + entry.first,
                           entry.second.front()));
    }
    sort(vCommands.begin(), vCommands.end());

    JSONRPCRequest jreq = helpreq;
    jreq.mode = JSONRPCRequest::GET_HELP;
    jreq.params = UniValue();

    for (const std::pair<std::string, const CRPCCommand *> &command :
         vCommands) {
        const CRPCCommand *pcmd = command.second;
        std::string strMethod = pcmd->name;
        if ((strCommand != "" || pcmd->category == "hidden") &&
            strMethod != strCommand) {
            continue;
        }

        jreq.strMethod = strMethod;
        try {
            UniValue unused_result;
            if (setDone.insert(pcmd->unique_id).second) {
                pcmd->actor(config, jreq, unused_result,
                            true /* last_handler */);
            }
        } catch (const std::exception &e) {
            // Help text is returned in an exception
            std::string strHelp = std::string(e.what());
            if (strCommand == "") {
                if (strHelp.find('\n') != std::string::npos) {
                    strHelp = strHelp.substr(0, strHelp.find('\n'));
                }

                if (category != pcmd->category) {
                    if (!category.empty()) {
                        strRet += "\n";
                    }
                    category = pcmd->category;
                    strRet += "== " + Capitalize(category) + " ==\n";
                }
            }
            strRet += strHelp + "\n";
        }
    }
    if (strRet == "") {
        strRet = strprintf("help: unknown command: %s\n", strCommand);
    }