refactored migration file getter

lib/migrator.js

@@ -29,27 +29,57 @@ module.exports = (function() {
   }
 
   Migrator.prototype.getUndoneMigrations = function(callback)  {
-    var undoneMigrations = fs.readdirSync(this.options.path)
+    var self = this
 
-    if(this.options.from) {
-      var fromDate = stringToDate(this.options.from.toString())
+    var filterFrom = function(files, from, callback, options) {
+      var fromDate = stringToDate(from.toString())
+        , result   = []
 
-      undoneMigrations = undoneMigrations.filter(function(file) {
+      result = files.filter(function(file) {
         var fileDate = stringToDate(file.split("-")[0])
-        return (fileDate >= fromDate)
+        return (options||{}).withoutEqual ? (fileDate > fromDate) : (fileDate >= fromDate)
       })
+
+      callback && callback(result)
     }
 
-    if(this.options.to) {
-      var toDate = stringToDate(this.options.to.toString())
+    var filterTo = function(files, to, callback) {
+      var toDate = stringToDate(to.toString())
+        , result = []
 
-      undoneMigrations = undoneMigrations.filter(function(file) {
+      result = files.filter(function(file) {
         var fileDate = stringToDate(file.split("-")[0])
         return (fileDate <= toDate)
       })
+
+      callback && callback(result)
     }
 
-    callback && callback(undoneMigrations)
+    var migrationFiles = fs.readdirSync(this.options.path)
+
+    if(this.options.from) {
+      filterFrom(migrationFiles, this.options.from, function(files) {
+        if(self.options.to) {
+          filterTo(files, self.options.to, callback)
+        } else {
+          callback && callback(files)
+        }
+      })
+    } else {
+      getLastMigrationIdFromDatabase.call(this).success(function(lastMigrationId) {
+        if(lastMigrationId) {
+          filterFrom(migrationFiles, lastMigrationId, function(files) {
+            if(self.options.to) {
+              filterTo(files, self.options.to, callback)
+            } else {
+              callback && callback(files)
+            }
+          }, { withoutEqual: true })
+        } else {
+          callback && callback(migrationFiles)
+        }
+      })
+    }
   }
 
   // private
@@ -59,7 +89,7 @@ module.exports = (function() {
     migration[method || 'up'](this.queryInterface, DataTypes)
   }
 
-  var getLastMigrationId = function() {
+  var getLastMigrationIdFromDatabase = function() {
     var self = this
 
     return new Utils.CustomEventEmitter(function(emitter) {

spec/migrator.spec.js

@@ -66,6 +66,18 @@ describe('Migrator', function() {
         })
       })
     })
+
+    it("returns all files from last migration id stored in database", function() {
+      setup()
+
+      Helpers.async(function(done) {
+        migrator.getUndoneMigrations(function(files) {
+          expect(files.length).toEqual(1)
+          expect(files[0]).toEqual('20111123060700-addBirthdateToPerson.js')
+          done()
+        })
+      })
+    })
   })
 /*