refactor(git): rework module around clearer Status and Repo split

lua/git/util.lua

@@ -1,11 +1,11 @@
 local M = {}
 
----@class ow.Git.ScratchOpts
+---@class ow.Git.Util.ScratchOpts
 ---@field name string?
 ---@field bufhidden ("hide"|"wipe")?
 
 ---@param buf integer
----@param opts ow.Git.ScratchOpts
+---@param opts ow.Git.Util.ScratchOpts
 local function setup_scratch(buf, opts)
     vim.bo[buf].buftype = "nofile"
     vim.bo[buf].bufhidden = opts.bufhidden or "wipe"
@@ -43,10 +43,10 @@ function M.place_buf(buf, split)
     return win
 end
 
----@class ow.Git.NewScratchOpts : ow.Git.ScratchOpts
+---@class ow.Git.Util.NewScratchOpts : ow.Git.Util.ScratchOpts
 ---@field split (false|"above"|"below"|"left"|"right")?
 
----@param opts ow.Git.NewScratchOpts?
+---@param opts ow.Git.Util.NewScratchOpts?
 ---@return integer buf
 ---@return integer win
 function M.new_scratch(opts)
@@ -170,14 +170,14 @@ function M.debounce(fn, delay)
         }
 end
 
----@class ow.Git.ExecOpts
+---@class ow.Git.Util.ExecOpts
 ---@field cwd string?
 ---@field stdin string?
 ---@field silent boolean?
 ---@field on_done fun(stdout: string?)?
 
 ---@param cmd string[]
----@param opts ow.Git.ExecOpts?
+---@param opts ow.Git.Util.ExecOpts?
 ---@return string?
 function M.exec(cmd, opts)
     opts = opts or {}
@@ -209,4 +209,40 @@ function M.exec(cmd, opts)
     return handle(vim.system(cmd, sys_opts):wait())
 end
 
+---@class ow.Git.Util.Emitter<T>
+---@field private _listeners table<T, (fun(...))[]>
+local Emitter = {}
+Emitter.__index = Emitter
+
+---@return ow.Git.Util.Emitter
+function Emitter.new()
+    return setmetatable({ _listeners = {} }, Emitter)
+end
+
+---@param event T
+---@param fn fun(...)
+---@return fun() unsubscribe
+function Emitter:on(event, fn)
+    local list = self._listeners[event] or {}
+    self._listeners[event] = list
+    table.insert(list, fn)
+    return function()
+        for i, f in ipairs(list) do
+            if f == fn then
+                table.remove(list, i)
+                return
+            end
+        end
+    end
+end
+
+---@param event T
+function Emitter:emit(event, ...)
+    for _, fn in ipairs(self._listeners[event] or {}) do
+        fn(...)
+    end
+end
+
+M.Emitter = Emitter
+
 return M