correct get() result for buffer ending between CR and LF

lib/index.js

@@ -12,14 +12,24 @@ function get(fileLocation, _, callback) {
 
     var reader = fs.createReadStream(fileLocation);
     var ran = false;
+    var tentativePreviousString;
+    var tentativeEndingType;
     reader.on('data', function(buffer) {
       if (!ran) {
-        var matched = buffer.toString().match(/\r\n|\r|\n/);
+        var str = (tentativePreviousString || '') + buffer.toString();
+        var matched = str.match(/\r\n|\r|\n/);
         var returned = {
           '\r': 'CR',
           '\n': 'LF',
           '\r\n': 'CRLF',
         }[matched];
+        if (matched && returned === 'CR') { // handle case where current buffer ends between CR and LF of CRLF
+          if (!str.match(/\r./)) { // make sure CR is followed by something other than end of string
+            tentativePreviousString = str;
+            tentativeEndingType = 'CR';
+            return;
+          }
+        }
         if (matched) {
           ran = true;
           reader.destroy();
@@ -30,7 +40,7 @@ function get(fileLocation, _, callback) {
     reader.on('end', function(buffer) {
       if (!ran) {
         ran = true;
-        callback(null, 'NA');
+        callback(null, tentativeEndingType || 'NA');
       }
     });
   });

test/api.js

@@ -13,6 +13,12 @@ describe('crlf', function() {
   };
   beforeEach(cleanup);
   afterEach(cleanup);
+  var longLine = "";
+  var bufferLength = 1024 * 64; // fs.createReadStream buffer length
+  while (longLine.length < bufferLength) {
+    longLine += "LongLine";
+  }
+  longLine = longLine.substr(0, bufferLength - 1);
 
   describe('get()', function() {
     it('can check line ending settings for linux', function(done) {
@@ -46,6 +52,23 @@ describe('crlf', function() {
         done();
       });
     });
+
+    it('can handle files where buffer ends between \\r and \\n of \\r\\n', function(done) {
+      var betweenLines = [longLine, longLine.substr(0, -1)].concat(lines); // this will cause two buffers ending between CR and LF in a row
+      fs.writeFileSync(fileLocation, betweenLines.join('\r\n'));
+      crlf.get(fileLocation, null, function(err, ending) {
+        assert.equal(ending, 'CRLF');
+        done();
+      });
+    });
+
+    it('can handle files where buffer ends between \\r and EOF', function(done) {
+      fs.writeFileSync(fileLocation, [longLine, ''].join('\r'));
+      crlf.get(fileLocation, null, function(err, ending) {
+        assert.equal(ending, 'CR');
+        done();
+      });
+    });
   });
 
   describe('set()', function() {