mirror of https://github.com/djcb/mu.git
141 lines
4.4 KiB
C++
141 lines
4.4 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-runtime.hh"
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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-parser.hh"
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#include "utils/mu-readline.hh"
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using namespace Mu;
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static std::atomic<bool> MuTerminate{false};
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static bool tty;
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static void
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install_sig_handler (void)
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{
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struct sigaction action;
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int i, sigs[] = { SIGINT, SIGHUP, SIGTERM, SIGPIPE };
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MuTerminate = false;
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action.sa_handler = [](int sig){ MuTerminate = true; };
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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 (Sexp&& sexp)
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{
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const auto str{sexp.to_sexp_string()};
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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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}
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MuError
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Mu::mu_cmd_server (const MuConfig *opts, GError **err) try {
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Store store{mu_runtime_path(MU_RUNTIME_PATH_XAPIANDB), false/*writable*/};
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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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store.metadata().database_path.c_str(),
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store.metadata().root_maildir.c_str(),
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opts->debug ? "yes" : "no");
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tty = ::isatty(::fileno(stdout));
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const auto eval = std::string {
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opts->commands ? "(help :full t)" : opts->eval ? opts->eval : ""};
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if (!eval.empty()) {
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server.invoke(eval);
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return MU_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{std::string{mu_runtime_path(MU_RUNTIME_PATH_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\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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shutdown_readline();
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return MU_OK;
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} catch (const Error& er) {
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g_critical ("server caught exception: %s", er.what());
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g_set_error(err, MU_ERROR_DOMAIN, MU_ERROR, "%s", er.what());
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return MU_ERROR;
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} catch (...) {
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g_critical ("server caught exception");
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g_set_error(err, MU_ERROR_DOMAIN, MU_ERROR, "%s", "caught exception");
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return MU_ERROR;
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}
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