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/*
* qtmaildir - a Qt6 mail client for notmuch-indexed Maildirs
* Copyright (C) 2026 Danilo M. <danix@danix.xyz>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <QApplication>
#include <QCoreApplication>
#include <QDir>
#include <QFileInfo>
#include <QIcon>
#include <QLocale>
#include <QMessageBox>
#include <QStandardPaths>
#include <QTranslator>
#include <QWebEngineUrlScheme>
#include <notmuch.h>
#include <cstdio>
#include <cstring>
#include "config.h"
#include "launchselectors.h"
#include "mainwindow.h"
#include "singleinstance.h"
#include "version.h"
int main(int argc, char *argv[])
{
// Answered before anything heavier starts: registering web engine schemes
// and constructing a QApplication to print one line would be absurd, and
// --version has to work on a machine where the GUI cannot open at all.
for (int i = 1; i < argc; ++i) {
if (std::strcmp(argv[i], "--version") == 0
|| std::strcmp(argv[i], "-v") == 0) {
std::printf("qtmaildir %s\n", QTMAILDIR_VERSION_DISPLAY);
return 0;
}
if (std::strcmp(argv[i], "--help") == 0
|| std::strcmp(argv[i], "-h") == 0) {
// The text lives with the parser, so the options and their
// descriptions cannot drift apart.
std::printf("%s",
LaunchSelectors::helpText(
QStringLiteral(QTMAILDIR_VERSION_DISPLAY))
.toLocal8Bit()
.constData());
return 0;
}
}
// Custom schemes must be registered before QApplication is constructed.
{
QWebEngineUrlScheme scheme(QByteArrayLiteral("cid"));
scheme.setFlags(QWebEngineUrlScheme::SecureScheme
| QWebEngineUrlScheme::ContentSecurityPolicyIgnored);
QWebEngineUrlScheme::registerScheme(scheme);
}
{
QWebEngineUrlScheme scheme(QByteArrayLiteral("qtmaildir"));
scheme.setFlags(QWebEngineUrlScheme::SecureScheme);
QWebEngineUrlScheme::registerScheme(scheme);
}
QApplication app(argc, argv);
app.setApplicationName(QStringLiteral("qtmaildir"));
app.setOrganizationName(QStringLiteral("qtmaildir"));
app.setApplicationVersion(QStringLiteral(QTMAILDIR_VERSION));
// Parsed AFTER QApplication, from app.arguments() rather than argv: the
// constructor consumes Qt's own options (-platform, -style and the rest)
// and removes them, so parsing the raw argv would reject a standard Qt
// option as unknown. No window exists yet, so a bad option still exits
// before anything is shown.
QString selectorError;
const LaunchSelectors selectors =
LaunchSelectors::parse(app.arguments(), &selectorError);
if (!selectorError.isEmpty()) {
std::fprintf(stderr, "qtmaildir: %s\n",
selectorError.toLocal8Bit().constData());
return 2;
}
// Connect first, become the server only if that fails. A live instance is
// handed the selectors and this process exits without ever opening a
// database: notmuch permits one handle per process, so two windows are two
// handles, which this avoids as a side effect of the feature.
//
// On main's stack, like the QTranslator below: it owns the socket for the
// life of the process and must outlive exec().
const QString socketPath = MainWindow::singleInstanceSocketPath();
// The state directory does not exist on a first run, and listen() cannot
// create a socket in a missing directory.
QDir().mkpath(QFileInfo(socketPath).absolutePath());
SingleInstance instance(socketPath);
if (!instance.tryBecomeServer()) {
if (instance.sendToRunningInstance(selectors))
return 0;
// No running instance answered and no socket could be created either.
// Carry on and open a window: losing single-instance behaviour is a
// degradation, and losing the mail client is not acceptable.
}
// Compiled in rather than read from disk, so the icon is there whether or
// not the app was installed. setDesktopFileName() is what lets a Wayland
// compositor match the window to its .desktop entry, which is where the
// taskbar icon really comes from there.
app.setWindowIcon(QIcon(QStringLiteral(":/icons/qtmaildir.svg")));
app.setDesktopFileName(QStringLiteral("qtmaildir"));
Config config;
config.load(Config::defaultPath());
// On main's stack deliberately: a QTranslator must outlive exec(), and one
// scoped to a helper function unloads on return, silently reverting every
// string to English.
//
// Loaded AFTER Config, because [general] language overrides the
// environment. The cost is that config warnings are generated before the
// translator exists, so they are built in English; retranslating them would
// mean re-running load(), and a warning about the config file is the one
// string a user can still act on in either language.
//
// An empty language() means follow the environment, which is what QLocale()
// default-constructs to. A missing .qm returns false and the app runs in
// English: that is the correct outcome both for an unsupported language and
// for `language = en_US`, since English is the source and ships no .qm.
const QLocale locale = config.language().isEmpty()
? QLocale()
: QLocale(config.language());
QTranslator translator;
QStringList translationDirs;
// Beside the binary first, so a build tree works without installing.
translationDirs << QCoreApplication::applicationDirPath()
+ QStringLiteral("/translations");
const QStringList dataDirs =
QStandardPaths::standardLocations(QStandardPaths::AppDataLocation);
for (const QString &dir : dataDirs)
translationDirs << dir + QStringLiteral("/translations");
for (const QString &dir : std::as_const(translationDirs)) {
if (translator.load(locale, QStringLiteral("qtmaildir"),
QStringLiteral("_"), dir)) {
app.installTranslator(&translator);
break;
}
}
// Fail loudly on an ABI mismatch rather than crashing later.
if (LIBNOTMUCH_MAJOR_VERSION < 5) {
QMessageBox::critical(nullptr, QObject::tr("qtmaildir"),
QObject::tr("libnotmuch 5 or newer is required."));
return 1;
}
MainWindow window(config);
window.show();
// What this launch asked for. After show(), so the window is up before a
// query starts running against it.
window.applySelectors(selectors);
// A later launch. The selectors arrive on the socket and go through the
// same applySelectors() this startup path just used.
QObject::connect(&instance, &SingleInstance::selectorsReceived, &window,
[&window](const LaunchSelectors &arrived) {
// Raised whatever the selectors say, an empty set
// included: a bare launch against a running window
// means "show me the window".
//
// Under Wayland this is a REQUEST, not a command. The
// compositor may honour it as a focus hint or ignore
// it by policy, which is its decision and not a defect
// to work around: the selectors still apply and the
// window still shows the right thing.
window.setWindowState(window.windowState()
& ~Qt::WindowMinimized);
window.show();
window.raise();
window.activateWindow();
window.applySelectors(arrived);
});
// After show(), and out here rather than inside the constructor. A modal
// raised from the constructor cannot be dismissed under the offscreen
// platform, so it hung the test suite with no output (item 84). Showing it
// here also gives the dialog a visible parent to sit on.
const QStringList problems = window.configProblems();
if (!problems.isEmpty()) {
QMessageBox::warning(&window, QObject::tr("Configuration problems"),
problems.join(QLatin1Char('\n')));
}
return app.exec();
}
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