From d6366964458f81f17d4a3bad85aaad4648dae7dd Mon Sep 17 00:00:00 2001
From: Xinhao Yuan <xinhaoyuan@gmail.com>
Date: Fri, 5 Jul 2019 10:44:42 -0400
Subject: [PATCH] history_save_max

---
 README.md  | 4 ++--
 editor.lua | 3 +--
 2 files changed, 3 insertions(+), 4 deletions(-)

diff --git a/README.md b/README.md
index 91ff822..e660579 100644
--- a/README.md
+++ b/README.md
@@ -106,11 +106,11 @@ history
 You need to specify the path of the history file in the editor data, then restore the persistent history by `layout_machi.editor.restore_data`. For example,
 
 ```
-machi_layout_data = layout_machi.editor.restore_data({ history_file = ".machi-layout" })
+machi_layout_data = layout_machi.editor.restore_data({ history_file = ".machi-layout", history_save_max = 10 })
 ```
 
 Then start the editor with the restored data.
-For now the last 10 commands are persisted.
+The last `history_save_max` commands are persisted.
 
 ## Other functions
 
diff --git a/editor.lua b/editor.lua
index 709fe1f..45d468a 100644
--- a/editor.lua
+++ b/editor.lua
@@ -515,12 +515,11 @@ function start_editor(data)
                data.cmds[#data.cmds + 1] = current_cmd
 
                if data.history_file then
-                  -- only save the last 10 layouts
                   local file, err = io.open(data.history_file, "w")
                   if err then
                      print("cannot save history to " .. data.history_file)
                   else
-                     for i = max(1, #data.cmds - 10), #data.cmds do
+                     for i = max(1, #data.cmds - data.history_save_max + 1), #data.cmds do
                         print("save cmd " .. data.cmds[i]) 
                         file:write(data.cmds[i] .. "\n")
                      end