Using local tslint

lib/init.coffee

@@ -1,6 +1,8 @@
 {CompositeDisposable} = require 'atom'
 path = require 'path'
-rulesDirectory = ''
+requireResolve = require 'resolve'
+
+TSLINT_MODULE_NAME = 'tslint'
 
 module.exports =
 
@@ -9,42 +11,83 @@ module.exports =
       type: 'string'
       title: 'Custom rules directory'
       default: ''
+    useLocalTslint:
+      type: 'boolean'
+      title: 'Try using the local tslint package (if exist)'
+      default: true
+
+  rulesDirectory: ''
+  tslintCache: new Map
+  tslintDef: null
+  useLocalTslint: true
 
   activate: ->
     @subscriptions = new CompositeDisposable
     @scopes = ['source.ts', 'source.tsx']
     @subscriptions.add atom.config.observe 'linter-tslint.rulesDirectory',
       (dir) =>
-        rulesDirectory = dir
+        @rulesDirectory = dir
+    @subscriptions.add atom.config.observe 'linter-tslint.useLocalTslint',
+      (use) =>
+        @tslintCache.clear()
+        @useLocalTslint = use
 
   deactivate: ->
     @subscriptions.dispose()
 
+  getLinter: (filePath) ->
+    basedir = path.dirname filePath
+    linter = @tslintCache.get basedir
+    if linter
+      return Promise.resolve(linter)
+
+    if @useLocalTslint
+      return @getLocalLinter(basedir)
+
+    @tslintCache.set basedir, @tslintDef
+    Promise.resolve(@tslintDef)
+
+  getLocalLinter: (basedir) ->
+    new Promise (resolve, reject) =>
+      requireResolve TSLINT_MODULE_NAME, { basedir },
+        (err, linterPath, pkg) =>
+          if not err and pkd?.version.startsWith('3.')
+            linter = require linterPath
+          else
+            linter = @tslintDef
+          @tslintCache.set basedir, linter
+          resolve(linter)
+
   provideLinter: ->
-    Linter = require 'tslint'
+    @tslintDef = require TSLINT_MODULE_NAME
+
     provider =
       grammarScopes: @scopes
       scope: 'file'
       lintOnFly: true
-      lint: (textEditor) ->
+      lint: (textEditor) =>
         filePath = textEditor.getPath()
         text = textEditor.getText()
-        configuration = Linter.findConfiguration(null, filePath)
 
-        directory = undefined
-        if (rulesDirectory && textEditor.project && textEditor.project.getPaths().length)
-          directory = textEditor.project.getPaths()[0] + path.sep + rulesDirectory
+        @getLinter(filePath).then (Linter) =>
+          configuration = Linter.findConfiguration(null, filePath)
+
+          directory = undefined
+          if @rulesDirectory and textEditor.project?.getPaths().length
+            directory = path.join textEditor.project.getPaths()[0],
+              @rulesDirectory
+
+          linter = new Linter filePath, text,
+            formatter: 'json',
+            configuration: configuration
+            rulesDirectory: directory
 
-        linter = new Linter(filePath, text, {
-          formatter: 'json',
-          configuration: configuration
-          rulesDirectory: directory
-        });
+          lintResult = linter.lint()
 
-        lintResult = linter.lint()
+          if not lintResult.failureCount
+            return []
 
-        if (lintResult.failureCount > 0)
-          return lintResult.failures.map (failure) ->
+          lintResult.failures.map (failure) ->
             startPosition = failure.getStartPosition().getLineAndCharacter()
             endPosition = failure.getEndPosition().getLineAndCharacter()
             {
@@ -53,7 +96,6 @@ module.exports =
               filePath: path.normalize failure.getFileName()
               range: [
                 [ startPosition.line, startPosition.character],
-                [ endPosition.line, endPosition.character]]
+                [ endPosition.line, endPosition.character]
+              ]
             }
-        else
-          return []

package.json

@@ -2,7 +2,7 @@
   "name": "linter-tslint",
   "main": "./lib/init",
   "linter-package": true,
-  "version": "0.6.0",
+  "version": "0.7.0",
   "description": "Linter plugin for Typescript, using tslint",
   "repository": {
     "type": "git",
@@ -13,6 +13,7 @@
     "atom": ">0.50.0"
   },
   "dependencies": {
+    "resolve": "1.1.7",
     "tslint": "^3.3.0",
     "typescript": ">=1.7.5"
   },