Add GPLv2-only license and per-file headers

Confirmed with the maintainer as v2-only rather than v2-or-later. LICENSE is
the official text from gnu.org. Every file under src/ and tests/ carries the
matching notice.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

1 files changed, 50 insertions, 0 deletions

diff --git a/src/main.cpp b/src/main.cpp
index 2c5dc13..4d3ed0a 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -1,14 +1,63 @@
+/*
+ * 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 <QMessageBox>
 #include <QWebEngineUrlScheme>
 
 #include <notmuch.h>
 
+#include <cstdio>
+#include <cstring>
+
 #include "config.h"
 #include "mainwindow.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);
+            return 0;
+        }
+        if (std::strcmp(argv[i], "--help") == 0
+            || std::strcmp(argv[i], "-h") == 0) {
+            std::printf(
+                "qtmaildir %s - a Qt6 mail client for notmuch-indexed Maildirs\n"
+                "\n"
+                "Usage: qtmaildir [options]\n"
+                "\n"
+                "  -h, --help     Show this help and exit\n"
+                "  -v, --version  Show the version and exit\n"
+                "\n"
+                "Configuration: ~/.config/qtmaildir/qtmaildir.conf\n"
+                "qtmaildir reads a notmuch-indexed Maildir. It does no network\n"
+                "protocol work: fetching and sending are external commands.\n",
+                QTMAILDIR_VERSION);
+            return 0;
+        }
+    }
+
     // Custom schemes must be registered before QApplication is constructed.
     {
         QWebEngineUrlScheme scheme(QByteArrayLiteral("cid"));
@@ -25,6 +74,7 @@ int main(int argc, char *argv[])
     QApplication app(argc, argv);
     app.setApplicationName(QStringLiteral("qtmaildir"));
     app.setOrganizationName(QStringLiteral("qtmaildir"));
+    app.setApplicationVersion(QStringLiteral(QTMAILDIR_VERSION));
 
     // Fail loudly on an ABI mismatch rather than crashing later.
     if (LIBNOTMUCH_MAJOR_VERSION < 5) {