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/*
** Copyright (C) 2025 Dirk-Jan C. Binnema <djcb@djcbsoftware.nl>
**
** This program is free software; you can redistribute it and/or modify it
** under the terms of the GNU General Public License as published by the
** Free Software Foundation; either version 3, or (at your option) any
** later version.
**
** 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 "mu-scm-types.hh"
#include "message/mu-message.hh"
#include "message/mu-mime-object.hh"
#include <mutex>
#include <cstdio>
using namespace Mu;
using namespace Mu::Scm;
namespace {
static SCM message_type;
static bool initialized;
std::mutex map_lock;
constexpr auto max_message_map_size{512};
struct MessageObject {
Message message;
SCM foreign_object{};
};
using MessageMap = std::unordered_map<std::string, MessageObject>;
static MessageMap message_map;
}
static const Message&
to_message(SCM scm, const char *func, int pos)
{
if (!SCM_IS_A_P(scm, message_type))
throw ScmError{ScmError::Id::WrongType, func, pos, scm, "mesagestore"};
return *reinterpret_cast<Message*>(scm_foreign_object_ref(scm, 0));
}
static void
finalize_message(SCM scm)
{
std::unique_lock lock{map_lock};
const auto msg = reinterpret_cast<const Message*>(scm_foreign_object_ref(scm, 0));
//mu_debug("finalizing message @ {}", msg->path());
if (const auto n = message_map.erase(msg->path()); n != 1)
mu_warning("huh?! deleted {}", n);
}
static SCM
subr_cc_message_make(SCM message_path_scm) try {
constexpr auto func{"cc-message-make"};
// message objects eat fds, tickle the gc... letting it handle it
// automatically is not soon enough.
if (message_map.size() >= 0.8 * max_message_map_size)
scm_gc();
std::unique_lock lock{map_lock};
// qttempt to give an good error message rather then getting something
// from GMime)
if (message_map.size() >= max_message_map_size)
throw ScmError{"cc-make-message", "too many open messages"};
// if we already have the message in our map, return it.
auto path{from_scm<std::string>(message_path_scm, func, 1)};
if (const auto it = message_map.find(path); it != message_map.end())
return it->second.foreign_object;
// don't have it yet; attempt to create one
if (auto res{Message::make_from_path(path)}; !res) {
mu_printerrln("{}", res.error().what());
throw ScmError{func, "failed to create message"};
} else {
// create a new object, store it in our map and return the foreign ptr.
std::pair<std::string, MessageObject> item {path,
MessageObject{std::move(*res), {}}};
auto it = message_map.emplace(std::move(item));
return it.first->second.foreign_object = scm_make_foreign_object_1(
message_type,
const_cast<Message*>(&it.first->second.message));
}
} catch (const ScmError& err) {
err.throw_scm();
}
static SCM
subr_cc_message_body(SCM message_scm, SCM html_scm) try {
constexpr auto func{"cc-message-make"};
const auto& message{to_message(message_scm, func, 1)};
const auto html{from_scm<bool>(html_scm, func, 2)};
if (const auto body{html ? message.body_html() : message.body_text()}; body)
return to_scm(*body);
else
return SCM_BOOL_F;
} catch (const ScmError& err) {
err.throw_scm();
}
static SCM
subr_cc_message_header(SCM message_scm, SCM field_scm) try {
constexpr auto func{"cc-message-header"};
const auto& message{to_message(message_scm, func, 1)};
const auto field{from_scm<std::string>(field_scm, func, 2)};
if (const auto val{message.header(field)}; val)
return to_scm(*val);
else
return SCM_BOOL_F;
} catch (const ScmError& err) {
err.throw_scm();
}
static SCM
subr_cc_message_plist(SCM message_scm) try {
constexpr auto func{"cc-message-plist"};
const auto& message{to_message(message_scm, func, 1)};
// return the serialized (mu4e) message
const auto plist{message.sexp().to_string()};
return to_scm(plist);
} catch (const ScmError& err) {
err.throw_scm();
}
/**
* Get a list of message's MIME-parts
*
* @param message_scm a Message (foreign-object)
*
* @return a list of MIME parts, each is a pair
* ( mime-obj . alist )
* where the mime-obj is the GMimeObject* as a foreign-object,
* and alist is an association list describing the part.
*/
static SCM
subr_cc_message_parts(SCM message_scm) try {
constexpr auto func{"cc-message-parts"};
const auto& message{to_message(message_scm, func, 1)};
const auto& parts{message.parts()};
SCM parts_scm{SCM_EOL};
for (size_t idx = 0; idx != parts.size(); ++idx) {
auto part{parts[idx]};
auto mime_part{GMIME_PART(part.mime_object().object())};
SCM mime_part_scm{to_scm(mime_part)};
SCM alist_scm{to_scm(idx, parts[idx])};
SCM item{scm_cons(mime_part_scm, alist_scm)};
parts_scm = scm_cons(item, parts_scm);
}
return scm_reverse_x(parts_scm, SCM_EOL);
} catch (const ScmError& err) {
err.throw_scm();
}
static void
init_subrs()
{
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wcast-function-type"
scm_c_define_gsubr("cc-message-make", 1/*req*/, 0/*opt*/, 0/*rst*/,
reinterpret_cast<scm_t_subr>(subr_cc_message_make));
scm_c_define_gsubr("cc-message-body", 2/*req*/, 0/*opt*/, 0/*rst*/,
reinterpret_cast<scm_t_subr>(subr_cc_message_body));
scm_c_define_gsubr("cc-message-header",2/*req*/, 0/*opt*/, 0/*rst*/,
reinterpret_cast<scm_t_subr>(subr_cc_message_header));
scm_c_define_gsubr("cc-message-parts",1/*req*/, 0/*opt*/, 0/*rst*/,
reinterpret_cast<scm_t_subr>(subr_cc_message_parts));
scm_c_define_gsubr("cc-message-plist",1/*req*/, 0/*opt*/, 0/*rst*/,
reinterpret_cast<scm_t_subr>(subr_cc_message_plist));
#pragma GCC diagnostic pop
}
void
Mu::Scm::init_message()
{
if (initialized)
return;
message_type = scm_make_foreign_object_type(
make_symbol("message"),
scm_list_1(make_symbol("data")),
finalize_message);
init_subrs();
initialized = true;
}
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