From 0c1ff6306f4bd6e3d89d893a790a8d389f63f5db Mon Sep 17 00:00:00 2001
From: Gabriel Birke <gabriel.birke@gmail.com>
Date: Fri, 23 Mar 2018 22:37:14 +0100
Subject: [PATCH] Add filesystem info param to change callbacks

Sometimes, you need information about the file (e.g. its modification
date, its path, its extension or its filename) to produce new front
matter or content. This patch can help with that.
---
 README.md | 16 ++++++++++++++++
 index.js  |  7 +++----
 2 files changed, 19 insertions(+), 4 deletions(-)

diff --git a/README.md b/README.md
index c6948ec..8aab010 100644
--- a/README.md
+++ b/README.md
@@ -74,6 +74,20 @@ function updateHandler(data, matter) {
 editor.read(filePath).data(updateHandler);
 ```
 
+You can use the optional third parameter `fileSystemInfo` to access information about the file itself:
+
+```
+let extend = require('util')._extend;
+
+function updateHandler(data, matter, fileSystemInfo) {
+  const d = fileSystemInfo.status.mtime;
+  data.last_updated = [d.getFullYear(), d.getMonth()+1, d.getDate()].join('-');
+  matter.data = data;
+}
+
+editor.read(filePath).data(updateHandler);
+```
+
 ## .content()
 This method update content in file.
 ```
@@ -84,6 +98,8 @@ function updateHandler(content, matter) {
 editor.read(filePath).content(updateHandler);
 ```
 
+This method also supports the optional third parameter `fileSystemInfo` for the callback.
+
 ## .save(destDirPath, options, callback)
 
 this method save to file. if this method have not options, save file by default options. default options is same filename with source file.
diff --git a/index.js b/index.js
index 12a315f..7af95f6 100644
--- a/index.js
+++ b/index.js
@@ -29,18 +29,18 @@ class FrontMatterService {
   }
 
   extend(func) {
-    func(this.matter.data, this.matter.content, this.matter);
+    func(this.matter.data, this.matter.content, this.matter, this.fileSystemInfo);
     return this;
   }
 
   data(func) {
     // this.matter = extend(this.matter, obj);
-    func(this.matter.data, this.matter);
+    func(this.matter.data, this.matter, this.fileSystemInfo);
     return this;
   }
 
   content(func) {
-    func(this.matter.content, this.matter);
+    func(this.matter.content, this.matter, this.fileSystemInfo);
     return this;
   }
 
@@ -79,4 +79,3 @@ module.exports = new FrontMatterService();
 // module.exports.prototype.show = function(){
 //   console.log(this.)
 // }
-