refactor: moved handler to separate modules

lua/lazy/core/handler/event.lua

@@ -0,0 +1,97 @@
+local Util = require("lazy.core.util")
+local Config = require("lazy.core.config")
+local Loader = require("lazy.core.loader")
+
+---@class LazyEventHandler:LazyHandler
+---@field events table<string,true>
+---@field group number
+local M = {}
+
+M.trigger_events = {
+  BufRead = { "BufReadPre", "BufRead" },
+  BufReadPost = { "BufReadPre", "BufRead", "BufReadPost" },
+}
+
+function M:init()
+  self.group = vim.api.nvim_create_augroup("lazy_handler_" .. self.type, { clear = true })
+  self.events = {}
+end
+
+---@param event_spec string
+function M:_add(_, event_spec)
+  if not self.events[event_spec] then
+    self:listen(event_spec)
+  end
+end
+
+---@param value string
+function M:_value(value)
+  return value == "VeryLazy" and "User VeryLazy" or value
+end
+
+function M:listen(event_spec)
+  self.events[event_spec] = true
+  ---@type string?, string?
+  local event, pattern = event_spec:match("^(%w+)%s+(.*)$")
+  event = event or event_spec
+  vim.api.nvim_create_autocmd(event, {
+    group = self.group,
+    once = true,
+    pattern = pattern,
+    callback = function()
+      if not self.active[event_spec] then
+        return
+      end
+      Util.track({ [self.type] = event_spec })
+      local groups = M.get_augroups(event, pattern)
+      -- load the plugins
+      Loader.load(self.active[event_spec], { [self.type] = event_spec })
+      self.events[event_spec] = nil
+      -- check if any plugin created an event handler for this event and fire the group
+      M.trigger(event, pattern, groups)
+      Util.track()
+    end,
+  })
+end
+
+-- Get all augroups for the events
+---@param event string
+---@param pattern? string
+function M.get_augroups(event, pattern)
+  local events = M.trigger_events[event] or { event }
+  ---@type table<string,true>
+  local groups = {}
+  for _, autocmd in ipairs(vim.api.nvim_get_autocmds({ event = events, pattern = pattern })) do
+    if autocmd.group then
+      groups[autocmd.group] = true
+    end
+  end
+  return groups
+end
+
+---@param event string|string[]
+---@param pattern? string
+---@param groups table<string,true>
+function M.trigger(event, pattern, groups)
+  local events = M.trigger_events[event] or { event }
+  ---@cast events string[]
+  for _, e in ipairs(events) do
+    for _, autocmd in ipairs(vim.api.nvim_get_autocmds({ event = e, pattern = pattern })) do
+      if autocmd.event == e and autocmd.group and not groups[autocmd.group] then
+        if Config.options.debug then
+          Util.info({
+            "# Firing Events",
+            "  - **group:** `" .. autocmd.group_name .. "`",
+            "  - **event:** " .. autocmd.event,
+            pattern and "- **pattern:** ",
+          })
+        end
+        Util.try(function()
+          vim.api.nvim_exec_autocmds(autocmd.event, { group = autocmd.group, modeline = false })
+        end)
+      end
+    end
+  end
+end
+
+return M