feat(hotkeys): add common function for adding terminal rules

lib/awful/hotkeys_popup/keys/init.lua

@@ -13,7 +13,26 @@ local keys = {
   tmux = require("awful.hotkeys_popup.keys.tmux"),
   qutebrowser = require("awful.hotkeys_popup.keys.qutebrowser"),
   termite = require("awful.hotkeys_popup.keys.termite"),
+  fish = require("awful.hotkeys_popup.keys.fish"),
 }
+
+
+--- Add rules to match terminal.
+--
+-- For example:
+--
+--     keys.add_rules_for_terminal({ rule = { class = "XTerm" }})
+--
+-- will show hotkeys for `fish` and `tmux` if `xterm` terminal is running.
+-- @function add_rules_for_terminal
+-- @see awful.rules.rules
+-- @tparam table rule Rules to match a terminal window.
+function keys.add_rules_for_terminal(rule)
+    keys.tmux.add_rules_for_terminal(rule)
+    keys.fish.add_rules_for_terminal(rule)
+end
+
+
 return keys
 
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