feat: add :DiffviewToggle command (sindrets#517)

Author: cosmicbuffalo

lua/diffview/init.lua

@@ -133,6 +133,7 @@ function M.open(args)
   end
 end
 
+
 ---@param range? { [1]: integer, [2]: integer }
 ---@param args string[]
 function M.file_history(range, args)
@@ -157,6 +158,16 @@ function M.close(tabpage)
   end
 end
 
+-- @param args string[]
+function M.toggle(args)
+  local view = lib.get_current_view()
+  if view then
+    M.close()
+  else
+    M.open(args)
+  end
+end
+
 function M.completion(_, cmd_line, cur_pos)
   local ctx = arg_parser.scan(cmd_line, { cur_pos = cur_pos, allow_ex_range = true })
   local cmd = ctx.args[1]

plugin/diffview.lua

@@ -24,6 +24,10 @@ command("DiffviewOpen", function(ctx)
   diffview.open(arg_parser.scan(ctx.args).args)
 end, { nargs = "*", complete = completion })
 
+command("DiffviewToggle", function(ctx)
+  diffview.toggle(arg_parser.scan(ctx.args).args)
+end, { nargs = "*", complete = completion })
+
 command("DiffviewFileHistory", function(ctx)
   local range