Show a warning if your local CoffeeLint needs upgrading

Fixes #35

lib/linter-coffeelint.coffee

@@ -24,9 +24,36 @@ class LinterCoffeelint extends Linter
       }))
     return 'coffeelint'
 
+  configImportsModules: (config) ->
+    return true for ruleName, rconfig of config when rconfig.module?
+    return userConfig?.coffeelint?.transforms?
+
+  canImportModules: (coffeelint) ->
+    [major, minor, patch] = coffeelint.VERSION.split('.').map(toInt)
+
+    if major > 1
+      return true
+    if major is 1 and minor > 9
+      return true
+    if major is 1 and minor is 9 and patch >= 5
+      return true
+    false
+
+  isCompatibleWithAtom: (coffeelint) ->
+    [major, minor, patch] = coffeelint.VERSION.split('.').map(toInt)
+
+    if major > 1
+      return true
+    if major is 1 and minor > 9
+      return true
+    if major is 1 and minor is 9 and patch >= 1
+      return true
+    false
+
   lintFile: (filePath, callback) ->
     filename = path.basename filePath
     origPath = path.join @cwd, filename
+    showUpgradeError = false
 
     coffeeLintPath = @_resolveCoffeeLint(origPath)
     coffeelint = require(coffeeLintPath)
@@ -36,9 +63,10 @@ class LinterCoffeelint extends Linter
     # this assumption, so CoffeeLint < 1.9.1 will fail to find CoffeeScript.
     # See https://github.com/clutchski/coffeelint/pull/383
     [major, minor, patch] = coffeelint.VERSION.split('.').map(toInt)
-    if (major <= 1 and minor < 9) or (major is 1 and minor is 9 and patch is 0)
+    if not @isCompatibleWithAtom(coffeelint)
       coffeeLintPath = 'coffeelint'
       coffeelint = require(coffeeLintPath)
+      showUpgradeError = true
 
     configFinder = require("#{coffeeLintPath}/lib/configfinder")
 
@@ -47,7 +75,12 @@ class LinterCoffeelint extends Linter
 
     try
       config = configFinder.getConfig(origPath)
-      result = coffeelint.lint(source, config, isLiterate)
+      console.log('using coffeelint', coffeelint.VERSION,
+        @configImportsModules(config), @canImportModules(coffeelint) )
+      if @configImportsModules(config) and not @canImportModules(coffeelint)
+        showUpgradeError = true
+      else
+        result = coffeelint.lint(source, config, isLiterate)
     catch e
       result = []
       console.log(e.message)
@@ -59,6 +92,14 @@ class LinterCoffeelint extends Linter
         rule: 'none'
       })
 
+    if showUpgradeError
+      result = [{
+        lineNumber: 1
+        level: 'error'
+        message: "http://git.io/local_upgrade upgrade your project's CoffeeLint"
+        rule: 'none'
+      }]
+
     callback(result.map(@transform))
 
   transform: (m) =>