From 83d5ba42f8a98fc0df177efef4333f74a0481f61 Mon Sep 17 00:00:00 2001
From: pants <niklasjo2004@gmail.com>
Date: Mon, 21 Sep 2026 14:18:06 -0700
Subject: init

---
 src/tmux.cpp | 142 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 142 insertions(+)
 create mode 100644 src/tmux.cpp

(limited to 'src/tmux.cpp')

diff --git a/src/tmux.cpp b/src/tmux.cpp
new file mode 100644
index 0000000..b919d7d
--- /dev/null
+++ b/src/tmux.cpp
@@ -0,0 +1,142 @@
+// Display images inside a terminal
+// Copyright (C) 2023  JustKidding
+//
+// 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 of the License, 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, see <https://www.gnu.org/licenses/>.
+
+#include "tmux.hpp"
+#include "os.hpp"
+#include "util.hpp"
+
+#include <array>
+#include <fmt/format.h>
+#include <string>
+#include <utility>
+
+constexpr auto session_hooks = std::to_array<std::string_view>(
+    {"session-window-changed", "client-detached", "window-layout-changed"});
+
+constexpr auto global_hooks = std::to_array<std::string_view>(
+    {"client-session-changed"});
+
+auto tmux::get_session_id() -> std::string
+{
+    const auto cmd = fmt::format("tmux display -p -F '#{{session_id}}' -t {}", tmux::get_pane());
+    return os::exec(cmd);
+}
+
+auto tmux::is_used() -> bool
+{
+    return !tmux::get_pane().empty();
+}
+
+auto tmux::is_window_focused() -> bool
+{
+    const auto cmd = fmt::format("tmux display -p -F '#{{session_attached}},#{{window_active}},#{{pane_in_mode}}' -t {}", tmux::get_pane());
+    return os::exec(cmd) == "1,1,0";
+}
+
+auto tmux::get_pane() -> std::string
+{
+    return os::getenv("TMUX_PANE").value_or("");
+}
+
+auto tmux::get_client_pids() -> std::optional<std::vector<int>>
+{
+    if (!tmux::is_used()) {
+        return {};
+    }
+    if (!tmux::is_window_focused()) {
+        return {};
+    }
+
+    std::vector<int> pids;
+    const auto cmd = fmt::format("tmux list-clients -F '#{{client_pid}}' -t {}", tmux::get_pane());
+    const auto output = os::exec(cmd);
+
+    for (const auto &line : util::str_split(output, "\n")) {
+        pids.push_back(std::stoi(line));
+    }
+
+    return pids;
+}
+
+auto tmux::get_offset() -> std::pair<int, int>
+{
+    if (!tmux::is_used()) {
+        return std::make_pair(0, 0);
+    }
+    const auto [p_x, p_y] = tmux::get_pane_offset();
+    const auto s_y = tmux::get_statusbar_offset();
+    return std::make_pair(p_x, p_y + s_y);
+}
+
+auto tmux::get_pane_offset() -> std::pair<int, int>
+{
+    const auto cmd = fmt::format(R"(tmux display -p -F '#{{pane_top}},#{{pane_left}},
+                                     #{{pane_bottom}},#{{pane_right}},
+                                     #{{window_height}},#{{window_width}}' -t {})",
+                                 tmux::get_pane());
+    const auto output = util::str_split(os::exec(cmd), ",");
+    return std::make_pair(std::stoi(output.at(1)), std::stoi(output.at(0)));
+}
+
+auto tmux::get_statusbar_offset() -> int
+{
+    const std::string cmd = "tmux display -p '#{status},#{status-position}'";
+    const auto output = util::str_split(os::exec(cmd), ",");
+    if (output.at(1) != "top" || output.at(0) == "off") {
+        return 0;
+    }
+    if (output.at(0) == "on") {
+        return 1;
+    }
+    return std::stoi(output.at(0));
+}
+
+void tmux::handle_hook(const std::string_view hook, int pid)
+{
+    const auto msg = fmt::format(R"({{"action":"tmux","hook":"{}"}})", hook);
+    const auto endpoint = util::get_socket_path(pid);
+    util::send_socket_message(msg, endpoint);
+}
+
+void tmux::register_hooks()
+{
+    if (!tmux::is_used()) {
+        return;
+    }
+    for (const auto &hook : session_hooks) {
+        std::string cmd = fmt::format(R"(tmux set-hook -t {0} {1} "run-shell 'ueberzugpp tmux {1} {2}'")", tmux::get_pane(), hook, os::get_pid());
+        os::exec(cmd);
+    }
+    for (const auto &hook : global_hooks) {
+        std::string cmd = fmt::format(R"(tmux set-hook -g {0} "run-shell 'ueberzugpp tmux {0} {1}'")", hook, os::get_pid());
+        os::exec(cmd);
+    }
+}
+
+void tmux::unregister_hooks()
+{
+    if (!tmux::is_used()) {
+        return;
+    }
+    for (const auto &hook : session_hooks) {
+        const auto cmd = fmt::format("tmux set-hook -u -t {} {}", tmux::get_pane(), hook);
+        os::exec(cmd);
+    }
+    for (const auto &hook : global_hooks) {
+        const auto cmd = fmt::format("tmux set-hook -gu {}", hook);
+        os::exec(cmd);
+    }
+}
-- 
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