diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/CMakeLists.txt | 1 | ||||
| -rw-r--r-- | src/draftstore.cpp | 82 | ||||
| -rw-r--r-- | src/draftstore.h | 60 |
3 files changed, 143 insertions, 0 deletions
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt index b7a5be2..a4d7c55 100644 --- a/src/CMakeLists.txt +++ b/src/CMakeLists.txt @@ -13,6 +13,7 @@ add_library(qtmaildir_lib STATIC carddelegate.cpp notmuchworker.cpp maildirname.cpp + draftstore.cpp tagchip.cpp tagcolors.cpp savequerydialog.cpp diff --git a/src/draftstore.cpp b/src/draftstore.cpp new file mode 100644 index 0000000..d458bff --- /dev/null +++ b/src/draftstore.cpp @@ -0,0 +1,82 @@ +/* + * 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 "draftstore.h" + +#include "maildirname.h" + +#include <QDir> +#include <QFile> +#include <QObject> +#include <QSaveFile> + +DraftStore::Result DraftStore::write(const QString &folderPath, + const QByteArray &bytes, + const QString &flags, + const QString &previousPath) +{ + Result result; + + if (folderPath.isEmpty()) { + result.error = QObject::tr("No folder was configured to write to."); + return result; + } + + // cur/, never new/. A file in new/ is re-announced as fresh mail by every + // reader of the Maildir, so an autosaved draft would arrive as a new + // message on every revision. + const QString curPath = folderPath + QStringLiteral("/cur"); + if (!QDir().mkpath(curPath)) { + result.error = QObject::tr("Cannot create the folder %1.").arg(curPath); + return result; + } + + // A FRESH name, with no previous one to preserve flags from: a draft is + // newly composed, and MessageBuilder's bytes carry no filename. The flags + // are appended here instead. + const QString name = MaildirName::fresh(QString()) + + QStringLiteral(":2,") + flags; + const QString target = curPath + QLatin1Char('/') + name; + + // QSaveFile: writes to a temporary and renames into place, so a reader + // never sees a half-written message. mbsync and notmuch both watch this + // directory. + QSaveFile file(target); + if (!file.open(QIODevice::WriteOnly)) { + result.error = QObject::tr("Cannot write to %1: %2") + .arg(target, file.errorString()); + return result; + } + + if (file.write(bytes) != bytes.size() || !file.commit()) { + result.error = QObject::tr("Cannot write to %1: %2") + .arg(target, file.errorString()); + return result; + } + + result.path = target; + + // AFTER the new file is safely in place, never before: unlinking first + // would lose the draft entirely if the write then failed. A failure to + // remove the old revision is not reported as a failure of the write, + // because the new revision IS on disk; the cost is one stale file. + if (!previousPath.isEmpty() && previousPath != target) + QFile::remove(previousPath); + + return result; +} diff --git a/src/draftstore.h b/src/draftstore.h new file mode 100644 index 0000000..13147c7 --- /dev/null +++ b/src/draftstore.h @@ -0,0 +1,60 @@ +/* + * 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. + */ + +#pragma once + +#include <QByteArray> +#include <QString> + +/// Writes message bytes into a Maildir folder. +/// +/// Drafts and sent copies are the same operation into different folders with +/// different flags, so they are one unit. Nothing here calls notmuch: the +/// files become visible on the next sync, which keeps the read-only-by-default +/// rule intact and needs no write lock. +class DraftStore +{ +public: + struct Result + { + QString path; ///< The file written. Empty on failure. + QString error; ///< Empty on success. + + bool ok() const { return error.isEmpty(); } + }; + + /// Writes \p bytes into \p folderPath, an absolute Maildir folder. + /// + /// The folder is the CALLER's to resolve, and item 124 is why it is not + /// resolved here: the mail root comes from + /// `notmuch_config_get(NOTMUCH_CONFIG_MAIL_ROOT)`, never from + /// `notmuch_database_get_path()`, which under a split index returns the + /// Xapian directory. A store that composed its own path from the wrong + /// accessor would write drafts into the index tree. + /// + /// \p flags is the Maildir flag string without the `:2,` prefix: "D" for a + /// draft, "S" for a sent copy. + /// + /// \p previousPath, when not empty, is unlinked AFTER the new file is + /// safely in place. Maildir has no in-place edit, so a draft rewritten + /// every thirty seconds would otherwise accumulate one file per pause. + /// The order matters: unlinking first would lose the draft entirely if the + /// write then failed. + static Result write(const QString &folderPath, const QByteArray &bytes, + const QString &flags, const QString &previousPath = {}); +}; |