Format how cache is dumped

lua/gitsigns.lua

@@ -571,7 +571,36 @@ end
 
 local function add_debug_functions()
    M.dump_cache = function()
-      api.nvim_echo({ { vim.inspect(cache) } }, false, {})
+      api.nvim_echo({ { vim.inspect(cache, {
+   process = function(raw_item, path)
+      if path[#path] == vim.inspect.METATABLE then
+         return nil
+      elseif type(raw_item) == "function" then
+         return nil
+      elseif type(raw_item) == "table" then
+         local key = path[#path]
+         if key == 'staged_text' then
+            local item = raw_item
+            return { '...', length = #item, head = item[1] }
+         elseif not vim.tbl_isempty(raw_item) and vim.tbl_contains({
+               'hunks', 'staged_diffs', }, key) then
+            return { '...', length = #vim.tbl_keys(raw_item) }
+         elseif key == 'pending_signs' then
+            local keys = vim.tbl_keys(raw_item)
+            local max = 100
+            if #keys > max then
+               keys.length = #keys
+               for i = max, #keys do
+                  keys[i] = nil
+               end
+               keys[max] = '...'
+            end
+            return keys
+         end
+      end
+      return raw_item
+   end,
+}), }, }, false, {})
    end
 
    M.debug_messages = function(noecho)

teal/gitsigns.tl

@@ -571,7 +571,36 @@ end
 
 local function add_debug_functions()
   M.dump_cache = function()
-    api.nvim_echo({{vim.inspect(cache)}}, false, {})
+    api.nvim_echo({{vim.inspect(cache, {
+      process = function(raw_item: any, path: {string}): any
+        if path[#path] == vim.inspect.METATABLE then
+          return nil
+        elseif raw_item is function then
+          return nil
+        elseif raw_item is table then
+          local key <const> = path[#path]
+          if key == 'staged_text' then
+            local item <const> = raw_item as {string}
+            return { '...', length=#item, head=item[1] }
+          elseif not vim.tbl_isempty(raw_item) and vim.tbl_contains({
+            'hunks', 'staged_diffs' }, key) then
+            return { '...', length=#vim.tbl_keys(raw_item) }
+          elseif key == 'pending_signs' then
+            local keys = vim.tbl_keys(raw_item)
+            local max <const> = 100
+            if #keys > max then
+              keys.length = #keys
+              for i = max, #keys do
+                keys[i] = nil
+              end
+              keys[max] = '...'
+            end
+            return keys
+          end
+        end
+        return raw_item
+      end
+    })}}, false, {})
   end
 
   M.debug_messages = function(noecho: boolean): {string}

types/types.d.tl

@@ -275,8 +275,12 @@ global record vim
     indent: string
     process: function
   end
-  inspect: function(any): string
-  inspect: function(any, InspectOptions): string
+  record inspect
+    METATABLE: any
+    KEY: any
+    metamethod __call: function(inspect, any, InspectOptions): string
+    metamethod __call: function(inspect, any): string
+  end
 
   wait: function(number, function, number, boolean)