Unify input methods with the installer keyboard selection

default/hypr/bindings/input-method.lua

@@ -0,0 +1,66 @@
+local paths = require("default.hypr.paths")
+
+-- Same terminal tag test as clipboard.lua.
+local function active_window_is_terminal()
+  local window = hl.get_active_window()
+  if not window then
+    return false
+  end
+
+  for _, tag in ipairs(window.tags or {}) do
+    if tag:gsub("%*$", "") == "terminal" then
+      return true
+    end
+  end
+
+  return false
+end
+
+-- Read on demand so adding an engine in a live desktop needs no reload.
+local function has_input_method()
+  local file = io.open(paths.config_home .. "/fcitx5/profile", "r")
+  if not file then return false end
+  local in_item, found = false, false
+  for line in file:lines() do
+    if line:match("^%[") then
+      in_item = line:match("^%[Groups/%d+/Items/%d+%]$") ~= nil
+    elseif in_item then
+      local name = line:match("^Name=(.+)$")
+      if name and not name:match("^keyboard%-") then found = true end
+    end
+  end
+  file:close()
+  return found
+end
+
+-- Preserve custom Ctrl + Space triggers. Without a
+-- [Hotkey/TriggerKeys] list in the config, fcitx5 uses its default, which has
+-- Ctrl + Space.
+local function fcitx5_toggles_on_ctrl_space()
+  local file = io.open(paths.config_home .. "/fcitx5/config", "r")
+  if not file then
+    return true
+  end
+
+  local in_triggers, has_triggers, toggles = false, false, false
+  for line in file:lines() do
+    if line:match("^%[") then
+      in_triggers = line == "[Hotkey/TriggerKeys]"
+      has_triggers = has_triggers or in_triggers
+    elseif in_triggers and line:match("^%d+=Control%+space$") then
+      toggles = true
+    end
+  end
+
+  file:close()
+  return toggles or not has_triggers
+end
+
+-- Pass the tmux/Herdr prefix through and return to direct input, so the next
+-- key reaches the multiplexer instead of the engine's composition.
+o.bind("CTRL + SPACE", "Direct input for the terminal prefix", function()
+  if active_window_is_terminal() and has_input_method() and not fcitx5_toggles_on_ctrl_space() then
+    -- Wait for the local controller reply before dispatching the next key.
+    o.shell_succeeds("timeout 0.3 fcitx5-remote --check -c")
+  end
+end, { non_consuming = true })