refactor: move handlers to its own file

lua/lazy/core/handler.lua

@@ -0,0 +1,152 @@
+local Util = require("lazy.core.util")
+local Loader = require("lazy.core.loader")
+
+local M = {}
+
+---@alias LazyHandler fun(plugins:LazyPlugin[])
+
+---@param plugins LazyPlugin[]
+---@param key string
+---@return table<any, LazyPlugin[]>
+function M.group(plugins, key)
+  ---@type table<any, LazyPlugin[]>
+  local ret = {}
+  for _, plugin in pairs(plugins) do
+    ---@diagnostic disable-next-line: no-unknown
+    for _, value in pairs(type(plugin[key]) == "table" and plugin[key] or { plugin[key] }) do
+      ret[value] = ret[value] or {}
+      table.insert(ret[value], plugin)
+    end
+  end
+  return ret
+end
+
+---@type table<string, LazyHandler>
+M.handlers = {}
+
+---@param plugins LazyPlugin[]
+function M.handlers.event(plugins)
+  local group = vim.api.nvim_create_augroup("lazy_handler_event", { clear = true })
+  ---@diagnostic disable-next-line: redefined-local
+  for event, plugins in pairs(M.group(plugins, "event")) do
+    ---@cast event string
+    if event == "VimEnter" and vim.v.vim_did_enter == 1 then
+      Loader.load(plugins, { event = event })
+    else
+      local _event, pattern = event:match("^(%w+)%s+(.*)$")
+      vim.api.nvim_create_autocmd(_event or event, {
+        group = group,
+        once = true,
+        pattern = pattern,
+        callback = function()
+          Util.track("event: " .. (_event == "User" and pattern or event))
+          Loader.load(plugins, { event = event })
+          Util.track()
+        end,
+      })
+    end
+  end
+end
+
+function M.handlers.keys(plugins)
+  ---@diagnostic disable-next-line: redefined-local
+  for keys, plugins in pairs(M.group(plugins, "keys")) do
+    ---@cast keys string
+    vim.keymap.set("n", keys, function()
+      vim.keymap.del("n", keys)
+      Util.track("keys: " .. keys)
+      Loader.load(plugins, { keys = keys })
+      vim.api.nvim_input(keys)
+      Util.track()
+    end)
+  end
+end
+
+function M.handlers.ft(plugins)
+  local group = vim.api.nvim_create_augroup("lazy_handler_ft", { clear = true })
+  ---@diagnostic disable-next-line: redefined-local
+  for ft, plugins in pairs(M.group(plugins, "ft")) do
+    ---@cast ft string
+    vim.api.nvim_create_autocmd("FileType", {
+      once = true,
+      pattern = ft,
+      group = group,
+      callback = function()
+        Util.track("filetype: " .. ft)
+        Loader.load(plugins, { ft = ft })
+        Util.track()
+      end,
+    })
+  end
+end
+
+function M.handlers.cmd(plugins)
+  ---@diagnostic disable-next-line: redefined-local
+  for cmd, plugins in pairs(M.group(plugins, "cmd")) do
+    ---@cast cmd string
+    local function _load(complete)
+      vim.api.nvim_del_user_command(cmd)
+      if complete then
+        Util.track("cmd-complete: " .. cmd)
+      else
+        Util.track("cmd: " .. cmd)
+      end
+      Loader.load(plugins, { cmd = cmd })
+      Util.track()
+    end
+    vim.api.nvim_create_user_command(cmd, function(event)
+      _load()
+      vim.cmd(
+        ("%s %s%s%s %s"):format(
+          event.mods or "",
+          event.line1 == event.line2 and "" or event.line1 .. "," .. event.line2,
+          cmd,
+          event.bang and "!" or "",
+          event.args or ""
+        )
+      )
+    end, {
+      bang = true,
+      nargs = "*",
+      complete = function()
+        _load(true)
+        -- HACK: trick Neovim to show the newly loaded command completion
+        vim.api.nvim_input("<space><bs><tab>")
+      end,
+    })
+  end
+end
+
+function M.handlers.module(plugins)
+  local modules = M.group(plugins, "module")
+  ---@param modname string
+  table.insert(package.loaders, 2, function(modname)
+    local idx = modname:find(".", 1, true) or #modname + 1
+    while idx do
+      local name = modname:sub(1, idx - 1)
+      ---@diagnostic disable-next-line: redefined-local
+      local plugins = modules[name]
+      if plugins then
+        modules[name] = nil
+        local reason = { require = modname }
+        if #Loader.loading == 0 then
+          local f = 3
+          while not reason.source do
+            local info = debug.getinfo(f, "S")
+            if not info then
+              break
+            end
+            if info.what ~= "C" then
+              reason.source = info.source:sub(2)
+            end
+            f = f + 1
+          end
+        end
+        Loader.load(plugins, reason)
+      end
+      idx = modname:find(".", idx + 1, true)
+    end
+  end)
+end
+
+return M