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home-manager/modules/programs/feh.nix
Olmo Kramer 41147ae09a
feh: allow binding actions to multiple buttons/keys
In feh you can bind multiple keys to the same action, but Home Manager
only let you set a single key to an action. You can cheat and pass a
string with space-separated keys, but with this change you can pass a
list for each action to bind multiple keys to it.

Also adds a couple of tests.

Fixes #1366
2020-09-30 00:55:09 +02:00

81 lines
2.3 KiB
Nix

{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.programs.feh;
bindingsOf = t: with types; attrsOf (nullOr (either t (listOf t)));
renderBindings = bindings:
let
enabled = filterAttrs (n: v: v != null) bindings;
disabled = filterAttrs (n: v: v == null) bindings;
render = mapAttrsToList renderBinding;
in concatStringsSep "\n" (render disabled ++ render enabled);
renderBinding = func: key:
if key == null then
func
else if isList key then
concatStringsSep " " ([ func ] ++ map toString key)
else
"${func} ${toString key}";
in {
options.programs.feh = {
enable = mkEnableOption "feh - a fast and light image viewer";
buttons = mkOption {
default = { };
type = with types; bindingsOf (either str int);
example = {
zoom_in = 4;
zoom_out = "C-4";
prev_img = [ 3 "C-3" ];
};
description = ''
Override feh's default mouse button mapping. If you want to disable an
action, set its value to null. If you want to bind multiple buttons to
an action, set its value to a list.
See <link xlink:href="https://man.finalrewind.org/1/feh/#x425554544f4e53"/> for
default bindings and available commands.
'';
};
keybindings = mkOption {
default = { };
type = bindingsOf types.str;
example = {
zoom_in = "plus";
zoom_out = "minus";
prev_img = [ "h" "Left" ];
};
description = ''
Override feh's default keybindings. If you want to disable a keybinding
set its value to null. If you want to bind multiple keys to an action,
set its value to a list.
See <link xlink:href="https://man.finalrewind.org/1/feh/#x4b455953"/> for
default bindings and available commands.
'';
};
};
config = mkIf cfg.enable {
assertions = [{
assertion = ((filterAttrs (n: v: v == "") cfg.keybindings) == { });
message =
"To disable a keybinding, use `null` instead of an empty string.";
}];
home.packages = [ pkgs.feh ];
xdg.configFile."feh/buttons" =
mkIf (cfg.buttons != { }) { text = renderBindings cfg.buttons + "\n"; };
xdg.configFile."feh/keys" = mkIf (cfg.keybindings != { }) {
text = renderBindings cfg.keybindings + "\n";
};
};
}