mirror of https://github.com/djcb/mu.git
171 lines
4.5 KiB
C++
171 lines
4.5 KiB
C++
/*
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** Copyright (C) 2020 Dirk-Jan C. Binnema <djcb@djcbsoftware.nl>
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**
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** This program is free software; you can redistribute it and/or modify it
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** under the terms of the GNU General Public License as published by the
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** Free Software Foundation; either version 3, or (at your option) any
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** later version.
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**
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** This program is distributed in the hope that it will be useful,
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** but WITHOUT ANY WARRANTY; without even the implied warranty of
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** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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** GNU General Public License for more details.
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**
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** You should have received a copy of the GNU General Public License
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** along with this program; if not, write to the Free Software Foundation,
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** Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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**
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*/
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#include "config.h"
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#include <string>
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#include <algorithm>
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#include <atomic>
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#include <cstdio>
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#include <unistd.h>
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#include "mu-cmd.hh"
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#include "mu-server.hh"
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#include "utils/mu-utils.hh"
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#include "utils/mu-command-handler.hh"
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#include "utils/mu-readline.hh"
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using namespace Mu;
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static std::atomic<int> MuTerminate{0};
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static bool tty;
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static void
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sig_handler(int sig)
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{
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MuTerminate = sig;
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}
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static void
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install_sig_handler(void)
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{
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static struct sigaction action;
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int i, sigs[] = {SIGINT, SIGHUP, SIGTERM, SIGPIPE};
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MuTerminate = 0;
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action.sa_handler = sig_handler;
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sigemptyset(&action.sa_mask);
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action.sa_flags = SA_RESETHAND;
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for (i = 0; i != G_N_ELEMENTS(sigs); ++i)
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if (sigaction(sigs[i], &action, NULL) != 0)
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g_critical("set sigaction for %d failed: %s",
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sigs[i], g_strerror(errno));
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}
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/*
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* Markers for/after the length cookie that precedes the expression we write to
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* output. We use octal 376, 377 (ie, 0xfe, 0xff) as they will never occur in
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* utf8 */
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#define COOKIE_PRE "\376"
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#define COOKIE_POST "\377"
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static void
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cookie(size_t n)
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{
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const auto num{static_cast<unsigned>(n)};
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if (tty) // for testing.
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::printf("[%x]", num);
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else
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::printf(COOKIE_PRE "%x" COOKIE_POST, num);
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}
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static void
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output_sexp_stdout(const Sexp& sexp, Server::OutputFlags flags)
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{
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/* if requested, insert \n between list elements; note:
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* is _not_ inherited by children */
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Sexp::Format fopts{};
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if (any_of(flags & Server::OutputFlags::SplitList))
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fopts |= Sexp::Format::SplitList;
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const auto str{sexp.to_string(fopts)};
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cookie(str.size() + 1);
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if (G_UNLIKELY(::puts(str.c_str()) < 0)) {
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g_critical("failed to write output '%s'", str.c_str());
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::raise(SIGTERM); /* terminate ourselves */
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}
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if (any_of(flags & Server::OutputFlags::Flush))
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std::fflush(stdout);
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}
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static void
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report_error(const Mu::Error& err) noexcept
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{
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output_sexp_stdout(Sexp(":error"_sym, static_cast<size_t>(err.code()),
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":message"_sym, err.what()),
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Server::OutputFlags::Flush);
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}
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Result<void>
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Mu::mu_cmd_server(const Mu::Options& opts) try {
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auto store = Store::make(opts.runtime_path(RuntimePath::XapianDb),
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Store::Options::Writable);
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if (!store)
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return Err(store.error());
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Server server{*store, output_sexp_stdout};
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g_message("created server with store @ %s; maildir @ %s; debug-mode %s;"
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"readline: %s",
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store->properties().database_path.c_str(),
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store->properties().root_maildir.c_str(),
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opts.debug ? "yes" : "no",
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have_readline() ? "yes" : "no");
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tty = ::isatty(::fileno(stdout));
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const auto eval = std::string{opts.server.commands ? "(help :full t)" : opts.server.eval};
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if (!eval.empty()) {
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server.invoke(eval);
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return Ok();
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}
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// Note, the readline stuff is inactive unless on a tty.
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const auto histpath{opts.runtime_path(RuntimePath::Cache) + "/history"};
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setup_readline(histpath, 50);
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install_sig_handler();
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std::cout << ";; Welcome to the " << PACKAGE_STRING << " command-server"
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<< (opts.debug ? " (debug-mode)" : "") << '\n'
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<< ";; Use (help) to get a list of commands, (quit) to quit.\n";
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bool do_quit{};
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while (!MuTerminate && !do_quit) {
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std::fflush(stdout); // Needed for Windows, see issue #1827.
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const auto line{read_line(do_quit)};
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if (line.find_first_not_of(" \t") == std::string::npos)
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continue; // skip whitespace-only lines
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do_quit = server.invoke(line) ? false : true;
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save_line(line);
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}
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if (MuTerminate != 0)
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g_message ("shutting down due to signal %d", MuTerminate.load());
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shutdown_readline();
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return Ok();
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} catch (const Error& er) {
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/* note: user-level error, "OK" for mu */
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report_error(er);
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g_warning("server caught exception: %s", er.what());
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return Ok();
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} catch (...) {
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g_critical("server caught exception");
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return Err(Error::Code::Internal, "caught exception");
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}
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