feat(git): add in-house hunks module, replace gitsigns.nvim

lua/git/core/util.lua

@@ -194,6 +194,65 @@ function M.debounce(fn, delay)
         }
 end
 
+---@class ow.Git.Util.KeyedDebounceHandle<K>
+---@field cancel fun(key: K)
+---@field flush fun(key: K)
+---@field pending fun(key: K): boolean
+---@field close fun()
+
+---@generic K, F: fun(key: K, ...)
+---@param fn F
+---@param delay integer
+---@return F, ow.Git.Util.KeyedDebounceHandle<K>
+function M.keyed_debounce(fn, delay)
+    ---@type table<any, { call: fun(...), handle: ow.Git.Util.DebounceHandle }>
+    local slots = {}
+
+    local function call(key, ...)
+        local t = type(key)
+        assert(
+            t == "string" or t == "number" or t == "boolean",
+            "key must be a primitive (string, number, boolean)"
+        )
+        local slot = slots[key]
+        if not slot then
+            local c, h = M.debounce(function(...)
+                fn(key, ...)
+            end, delay)
+            slot = { call = c, handle = h }
+            slots[key] = slot
+        end
+        slot.call(...)
+    end
+
+    return call,
+        {
+            cancel = function(key)
+                local slot = slots[key]
+                if slot then
+                    slot.handle.close()
+                    slots[key] = nil
+                end
+            end,
+            flush = function(key)
+                local slot = slots[key]
+                if slot then
+                    slot.handle.flush()
+                end
+            end,
+            pending = function(key)
+                local slot = slots[key]
+                return slot ~= nil and slot.handle.pending()
+            end,
+            close = function()
+                for _, slot in pairs(slots) do
+                    slot.handle.close()
+                end
+                slots = {}
+            end,
+        }
+end
+
 ---@class ow.Git.Util.ExecOpts
 ---@field cwd string?
 ---@field stdin string?