181 lines
5.8 KiB
C++
181 lines
5.8 KiB
C++
/*
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* FlowLineNoise.actor.cpp
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*
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* This source file is part of the FoundationDB open source project
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*
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* Copyright 2013-2018 Apple Inc. and the FoundationDB project authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "flow/actorcompiler.h"
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#include "FlowLineNoise.h"
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#include "flow/IThreadPool.h"
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#define BOOST_SYSTEM_NO_LIB
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#define BOOST_DATE_TIME_NO_LIB
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#define BOOST_REGEX_NO_LIB
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#include "boost/asio.hpp"
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#include "flow/ThreadHelper.actor.h"
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#if __unixish__
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#define HAVE_LINENOISE 1
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#include "linenoise/linenoise.h"
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#else
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#define HAVE_LINENOISE 0
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#endif
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struct LineNoiseReader : IThreadPoolReceiver {
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virtual void init() {}
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struct Read : TypedAction<LineNoiseReader, Read> {
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std::string prompt;
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ThreadReturnPromise<Optional<std::string>> result;
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virtual double getTimeEstimate() { return 0.0; }
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explicit Read(std::string const& prompt) : prompt(prompt) {}
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};
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void action(Read& r) {
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try {
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r.result.send( read(r.prompt) );
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} catch (Error& e) {
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r.result.sendError(e);
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} catch (...) {
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r.result.sendError(unknown_error());
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}
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}
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private:
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Optional<std::string> read(std::string const& prompt) {
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#if HAVE_LINENOISE
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errno = 0;
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char* line = linenoise(prompt.c_str());
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if (line) {
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std::string s(line);
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free(line);
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return s;
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} else {
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if (errno == EAGAIN) // Ctrl-C
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return std::string();
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return Optional<std::string>();
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}
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#else
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std::string line;
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std::fputs( prompt.c_str(), stdout );
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if (!std::getline( std::cin, line ).eof()) {
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return line;
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} else
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return Optional<std::string>();
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#endif
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}
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};
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LineNoise::LineNoise(
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std::function< void(std::string const&, std::vector<std::string>&) > _completion_callback,
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std::function< Hint(std::string const&) > _hint_callback,
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int maxHistoryLines,
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bool multiline )
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: threadPool( createGenericThreadPool() )
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{
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reader = new LineNoiseReader();
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#if HAVE_LINENOISE
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// It should be OK to call these functions from this thread, since read() can't be called yet
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// The callbacks passed to linenoise*() will be invoked from the thread pool, and use onMainThread() to safely invoke the callbacks we've been given
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// linenoise doesn't provide any form of data parameter to callbacks, so we have to use static variables
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static std::function< void(std::string const&, std::vector<std::string>&) > completion_callback;
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static std::function< Hint(std::string const&) > hint_callback;
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completion_callback = _completion_callback;
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hint_callback = _hint_callback;
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linenoiseHistorySetMaxLen( maxHistoryLines );
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linenoiseSetMultiLine( multiline );
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linenoiseSetCompletionCallback( [](const char* line, linenoiseCompletions* lc) {
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// This code will run in the thread pool
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std::vector<std::string> completions;
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onMainThread( [line, &completions]() -> Future<Void> {
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completion_callback(line, completions);
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return Void();
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}).getBlocking();
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for( auto const& c : completions )
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linenoiseAddCompletion( lc, c.c_str() );
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});
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/*linenoiseSetHintsCallback( [](const char* line, int* color, int*bold) -> const char* {
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Hint h = onMainThread( [line]() -> Future<Hint> {
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return hint_callback(line);
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}).getBlocking();
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if (!h.valid) return NULL;
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*color = h.color;
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*bold = h.bold;
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return strdup( h.text.c_str() );
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});
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linenoiseSetFreeHintsCallback( free );*/
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#endif
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threadPool->addThread(reader);
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}
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LineNoise::~LineNoise() {
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threadPool.clear();
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}
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Future<Optional<std::string>> LineNoise::read( std::string const& prompt ) {
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auto r = new LineNoiseReader::Read(prompt);
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auto f = r->result.getFuture();
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threadPool->post(r);
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return f;
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}
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ACTOR Future<Void> waitKeyboardInterrupt(boost::asio::io_service* ios) {
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state boost::asio::signal_set signals(*ios, SIGINT);
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Promise<Void> result;
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signals.async_wait([result](const boost::system::error_code& error, int signal_number) {
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if (error) {
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result.sendError(io_error());
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} else {
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result.send(Void());
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}
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});
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Void _ = wait(result.getFuture());
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return Void();
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}
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Future<Void> LineNoise::onKeyboardInterrupt() {
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boost::asio::io_service* ios = (boost::asio::io_service*)g_network->global(INetwork::enASIOService);
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if (!ios) return Never();
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return waitKeyboardInterrupt(ios);
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}
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void LineNoise::historyAdd( std::string const& line ) {
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#if HAVE_LINENOISE
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linenoiseHistoryAdd( line.c_str() );
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#endif
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}
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void LineNoise::historyLoad( std::string const& filename ) {
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#if HAVE_LINENOISE
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if(linenoiseHistoryLoad(filename.c_str()) != 0) {
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throw io_error();
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}
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#endif
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}
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void LineNoise::historySave( std::string const& filename ) {
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#if HAVE_LINENOISE
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if(linenoiseHistorySave(filename.c_str()) != 0) {
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throw io_error();
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}
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#endif
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} |