The tmux command parity release. ~50 new public methods land across Server, Pane, Window, and Session, plus expanded flag coverage on existing wrappers, plus a control_mode test fixture that lets commands requiring an attached client run under CI without a TTY. Net result: callers no longer need to drop down to Server.cmd(...) for the commands tmux ships out of the box.

No breaking changes — public API is purely additive.

Highlights

Interactive tmux commands now scriptable

New wrappers for commands that require an attached client:

• Pane.display_popup, Pane.display_panes
• Pane.choose_buffer, Pane.choose_client, Pane.choose_tree
• Server.display_menu, Server.command_prompt, Server.confirm_before
• Session.detach_client, Server.detach_client, Server.detach_all_clients

The three detach-client wrappers each map to one tmux flag group exactly, with a single subprocess call:

tmux buffer I/O suite

Round-trip pane content through named tmux buffers — useful for clipboard interop and inter-process data hand-off:

• Server.set_buffer, Server.show_buffer, Server.delete_buffer
• Server.save_buffer, Server.load_buffer, Server.list_buffers
• Pane.paste_buffer

Key bindings, shell execution, and client management

• Server: bind_key, unbind_key, list_keys, list_commands, run_shell, if_shell, source_file, list_clients, start_server, lock_server, lock_client, refresh_client, suspend_client, server_access, show_messages, show_prompt_history, clear_prompt_history
• Session: lock_session
• Pane: send_prefix

Window and pane manipulation parity

• Window: swap, link, unlink, respawn, last_pane, next_layout, previous_layout, rotate
• Pane: swap, join, break_pane, move, pipe, clear_history, respawn, copy_mode, clock_mode, customize_mode, find_window
• Server: wait_for
• Session: last_window, next_window, previous_window

Filled-in flag coverage on existing methods

Most pre-existing wrappers now expose the remaining tmux flags:

• Pane.send_keys — literal, hex_keys, key_name, expand_formats, target_client, repeat, reset, copy_mode_cmd
• Pane.split — percentage=
• Pane.capture_pane — alternate_screen, quiet, mode_screen, to_buffer (writes capture into a tmux buffer instead of returning it)
• Pane.display_message — format_string, verbose, delay, notify, update_pane, target_client
• Pane.display_popup — target_client=, -c
• Window.move_window — after, before, kill, renumber
• Window.select_layout — spread, next, previous
• Server.new_session — detach_others, no_size, config
• Session.new_window — kill_existing, select_existing
• EnvironmentMixin.set_environment — expand_format, hidden
• OptionsMixin.show_options — quiet

control_mode pytest fixture

A new fixture spawns a real tmux -C attach-session subprocess that registers as a real client, satisfying commands like Pane.display_popup, Session.detach_client, Server.command_prompt, and Server.confirm_before — no TTY required. Exposed via libtmux.pytest_plugin and into the doctest namespace via conftest.py.

def test_display_popup(control_mode) -> None:
    with control_mode() as ctl:
        # commands needing an attached client now work
        assert ctl.client_name != ""

Bug fixes

• Window.move_window() returns up-to-date state after the move. Previously left the Window object pointing at its pre-move index, so attribute reads could appear stale until a manual refresh() call. The moved window now refreshes automatically.
• Pane.swap makes target optional when move_up/move_down is set, since tmux's swap-pane -U/-D already imply the target.
• OptionsMixin.show_options wires quiet= through the public API, fixing a flag that was previously inert.
• Window.last_pane calls tmux last-pane directly instead of select-pane -l, exposing its native flags (disable_input=-d, enable_input=-e, keep_zoom=-Z) with correct mappings per cmd-select-pane.c.

Compatibility

• TMUX_MAX_VERSION bumped 3.6 → 3.7, unlocking method coverage already version-gated for tmux 3.7 — notably Server.command_prompt(bspace_exit=...) and Server.show_messages(terminals=..., jobs=...). No effect on installations running tmux 3.6 or earlier.
• Every version-gated flag uses has_gte_version(...) with a warnings.warn(stacklevel=2) fallback when the running tmux is too old, matching the existing trim_trailing pattern.
• All new methods and parameters are annotated with .. versionadded:: 0.56 so downstream readers can see availability at a glance.

Documentation

• Bumped gp-sphinx docs stack to v0.0.1a16 — docs site now renders via gp-furo-theme, a Tailwind v4 respin of Furo, with sphinx-vite-builder handling theme-asset builds (#666).

Tests

• test_no_server_* and test_raise_if_dead_no_server_raises now reuse the server fixture for a unique socket name and finalizer cleanup, instead of hardcoded socket names with no finalizer that broke whenever a stale tmux daemon survived at the same path (#665, fixes #664).

What's Changed

• test_server(fix[isolation]): use server fixture for "no server" tests by @tony in #665
• Bump gp-sphinx → 0.0.1a16 (sphinx-vite-builder consolidation) by @tony in #666
• tmux parity: add interactive command coverage and align flag semantics with tmux by @tony in #653

Full Changelog: v0.55.1...v0.56.0

Contributors