1 files changed, 37 insertions, 0 deletions
diff --git a/lua/blink/cmp/lib/event_emitter.lua b/lua/blink/cmp/lib/event_emitter.lua
new file mode 100644
index 0000000..d3939cb
--- /dev/null
+++ b/lua/blink/cmp/lib/event_emitter.lua
@@ -0,0 +1,37 @@
+--- @class blink.cmp.EventEmitter<T> : { event: string, autocmd?: string, listeners: table<fun(data: T)>, new: ( fun(event: string, autocmd: string): blink.cmp.EventEmitter ), on: ( fun(self: blink.cmp.EventEmitter, callback: fun(data: T)) ), off: ( fun(self: blink.cmp.EventEmitter, callback: fun(data: T)) ), emit: ( fun(self: blink.cmp.EventEmitter, data?: table) ) };
+--- TODO: is there a better syntax for this?
+
+local event_emitter = {}
+
+--- @param event string
+--- @param autocmd? string
+function event_emitter.new(event, autocmd)
+  local self = setmetatable({}, { __index = event_emitter })
+  self.event = event
+  self.autocmd = autocmd
+  self.listeners = {}
+  return self
+end
+
+function event_emitter:on(callback) table.insert(self.listeners, callback) end
+
+function event_emitter:off(callback)
+  for idx, cb in ipairs(self.listeners) do
+    if cb == callback then table.remove(self.listeners, idx) end
+  end
+end
+
+function event_emitter:emit(data)
+  data = data or {}
+  data.event = self.event
+  for _, callback in ipairs(self.listeners) do
+    callback(data)
+  end
+  if self.autocmd then
+    require('blink.cmp.lib.utils').schedule_if_needed(
+      function() vim.api.nvim_exec_autocmds('User', { pattern = self.autocmd, modeline = false, data = data }) end
+    )
+  end
+end
+
+return event_emitter