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{ config, pkgs, lib, ... }:
let
inherit (lib) mkOption mkIf types;
cfg = config.programs.tmux;
defaultKeyMode = "emacs";
defaultResize = 5;
defaultShortcut = "b";
defaultTerminal = "screen";
boolToStr = value: if value then "on" else "off";
tmuxConf = ''
set -g default-terminal "${cfg.terminal}"
set -g base-index ${toString cfg.baseIndex}
setw -g pane-base-index ${toString cfg.baseIndex}
${if cfg.newSession then "new-session" else ""}
${if cfg.reverseSplit then ''
bind v split-window -h
bind s split-window -v
'' else ""}
set -g status-keys ${cfg.keyMode}
set -g mode-keys ${cfg.keyMode}
${if cfg.keyMode == "vi" && cfg.customPaneNavigationAndResize then ''
bind h select-pane -L
bind j select-pane -D
bind k select-pane -U
bind l select-pane -R
bind -r H resize-pane -L ${toString cfg.resizeAmount}
bind -r J resize-pane -D ${toString cfg.resizeAmount}
bind -r K resize-pane -U ${toString cfg.resizeAmount}
bind -r L resize-pane -R ${toString cfg.resizeAmount}
'' else ""}
${if (cfg.shortcut != defaultShortcut) then ''
# rebind main key: C-${cfg.shortcut}
unbind C-${defaultShortcut}
set -g prefix C-${cfg.shortcut}
bind ${cfg.shortcut} send-prefix
bind C-${cfg.shortcut} last-window
'' else ""}
setw -g aggressive-resize ${boolToStr cfg.aggressiveResize}
setw -g clock-mode-style ${if cfg.clock24 then "24" else "12"}
set -s escape-time ${toString cfg.escapeTime}
set -g history-limit ${toString cfg.historyLimit}
${cfg.extraTmuxConf}
'';
in {
###### interface
options = {
programs.tmux = {
enable = mkOption {
type = types.bool;
default = false;
description = "Whenever to configure <command>tmux</command> system-wide.";
relatedPackages = [ "tmux" ];
};
aggressiveResize = mkOption {
default = false;
type = types.bool;
description = ''
Resize the window to the size of the smallest session for which it is the current window.
'';
};
baseIndex = mkOption {
default = 0;
example = 1;
type = types.int;
description = "Base index for windows and panes.";
};
clock24 = mkOption {
default = false;
type = types.bool;
description = "Use 24 hour clock.";
};
customPaneNavigationAndResize = mkOption {
default = false;
type = types.bool;
description = "Override the hjkl and HJKL bindings for pane navigation and resizing in VI mode.";
};
escapeTime = mkOption {
default = 500;
example = 0;
type = types.int;
description = "Time in milliseconds for which tmux waits after an escape is input.";
};
extraTmuxConf = mkOption {
default = "";
description = ''
Additional contents of /etc/tmux.conf
'';
type = types.lines;
};
historyLimit = mkOption {
default = 2000;
example = 5000;
type = types.int;
description = "Maximum number of lines held in window history.";
};
keyMode = mkOption {
default = defaultKeyMode;
example = "vi";
type = types.enum [ "emacs" "vi" ];
description = "VI or Emacs style shortcuts.";
};
newSession = mkOption {
default = false;
type = types.bool;
description = "Automatically spawn a session if trying to attach and none are running.";
};
reverseSplit = mkOption {
default = false;
type = types.bool;
description = "Reverse the window split shortcuts.";
};
resizeAmount = mkOption {
default = defaultResize;
example = 10;
type = types.int;
description = "Number of lines/columns when resizing.";
};
shortcut = mkOption {
default = defaultShortcut;
example = "a";
type = types.str;
description = "Ctrl following by this key is used as the main shortcut.";
};
terminal = mkOption {
default = defaultTerminal;
example = "screen-256color";
type = types.str;
description = "Set the $TERM variable.";
};
secureSocket = mkOption {
default = true;
type = types.bool;
description = ''
Store tmux socket under /run, which is more secure than /tmp, but as a
downside it doesn't survive user logout.
'';
};
};
};
###### implementation
config = mkIf cfg.enable {
environment = {
etc."tmux.conf".text = tmuxConf;
systemPackages = [ pkgs.tmux ];
variables = {
TMUX_TMPDIR = lib.optional cfg.secureSocket ''''${XDG_RUNTIME_DIR:-"/run/user/$(id -u)"}'';
};
};
};
}
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