Support for automatic detection

"lib/encoding-list-view.js" is used for the detection.

lib/main.js

@@ -1,3 +1,5 @@
+const {CompositeDisposable} = require('atom')
+
 const EncodingListView = require('./encoding-list-view')
 const EncodingStatusView = require('./encoding-status-view')
 
@@ -166,19 +168,28 @@ const encodings = {
 
 let encodingListView = null
 let encodingStatusView = null
-let commandSubscription = null
+let commandSubscriptions = null
 
 module.exports = {
   activate () {
-    commandSubscription = atom.commands.add('atom-text-editor', 'encoding-selector:show', () => {
+    commandSubscriptions = new CompositeDisposable()
+    commandSubscriptions.add(atom.commands.add('atom-text-editor', 'encoding-selector:show', () => {
       if (!encodingListView) encodingListView = new EncodingListView(encodings)
       encodingListView.toggle()
-    })
+    }))
+
+    // Auto Detect
+    if (atom.config.get('encoding-selector.alwaysAutoDetect')) {
+      // event: open file
+      commandSubscriptions.add(atom.workspace.observeTextEditors(() => encodingListView.detectEncoding()))
+      // event: changed active pane
+      commandSubscriptions.add(atom.workspace.onDidChangeActivePaneItem(() => encodingListView.detectEncoding()))
+    }
   },
 
   deactivate () {
-    if (commandSubscription) commandSubscription.dispose()
-    commandSubscription = null
+    if (commandSubscriptions) commandSubscriptions.dispose()
+    commandSubscriptions = null
 
     if (encodingStatusView) encodingStatusView.destroy()
     encodingStatusView = null

package.json

@@ -33,5 +33,38 @@
       "jasmine",
       "spyOn"
     ]
+  },
+  "configSchema": {
+    "alwaysAutoDetect": {
+      "title": "Always auto detect",
+      "description": "enabled from startup",
+      "type": "boolean",
+      "default": false
+    },
+    "disallowEncTypes": {
+      "title": "Disallow some encoding types",
+      "description": "example: windows1252, iso88591",
+      "type": "string",
+      "default": ""
+    },
+    "divideSize": {
+      "title": "Divide Buffer Size",
+      "description": "The number of the consideration.",
+      "type": "number",
+      "default": 1,
+      "minimum": 1
+    },
+    "ignorePattern": {
+      "title": "Ignore Pattern",
+      "description": "example: (txt|js)$",
+      "type": "string",
+      "default": ""
+    },
+    "forceEncTypes": {
+      "title": "Force some encoding types",
+      "description": "example: windows1252:windows1251, iso88591:windows1251",
+      "type": "string",
+      "default": ""
+    }
   }
 }