1 files changed, 61 insertions, 0 deletions
diff --git a/runtime/lua/core/hooks.lua b/runtime/lua/core/hooks.lua
new file mode 100644
index 0000000..9623e9c
--- /dev/null
+++ b/runtime/lua/core/hooks.lua
@@ -0,0 +1,61 @@
+local M = {}
+
+function M.new_store()
+  return {}
+end
+
+function M.add(store, event_name, fn)
+  if type(event_name) ~= "string" or event_name == "" then
+    return false, "event name must be a non-empty string"
+  end
+  if type(fn) ~= "function" then
+    return false, "hook must be a function"
+  end
+
+  local bucket = store[event_name]
+  if not bucket then
+    bucket = {}
+    store[event_name] = bucket
+  end
+
+  bucket[#bucket + 1] = fn
+  return true
+end
+
+function M.run(store, event_name, ...)
+  local bucket = store[event_name]
+  if not bucket then
+    return true
+  end
+
+  local ok_all = true
+  for i = 1, #bucket do
+    local ok, err = pcall(bucket[i], ...)
+    if not ok then
+      ok_all = false
+      print(string.format("lemacs hook error [%s]: %s", event_name, tostring(err)))
+    end
+  end
+
+  return ok_all
+end
+
+function M.run_first_truthy(store, event_name, ...)
+  local bucket = store[event_name]
+  if not bucket then
+    return false
+  end
+
+  for i = 1, #bucket do
+    local ok, result = pcall(bucket[i], ...)
+    if not ok then
+      print(string.format("lemacs hook error [%s]: %s", event_name, tostring(result)))
+    elseif result then
+      return true
+    end
+  end
+
+  return false
+end
+
+return M