dartfmt line wrapping bypass option support.

pkg/analyzer/bin/formatter.dart

Index: pkg/analyzer/bin/formatter.dart
===================================================================
--- pkg/analyzer/bin/formatter.dart	(revision 32027)
+++ pkg/analyzer/bin/formatter.dart	(working copy)
@@ -63,7 +63,7 @@
   selection = _parseSelection(options[SELECTION_FLAG]);
   formatterSettings =
       new FormatterOptions(codeTransforms: options[TRANSFORM_FLAG],
-          pageWidth: _toInt(options[MAX_LINE_FLAG]));
+          pageWidth: _parseLineLength(options[MAX_LINE_FLAG]));
 }
 
 CodeKind _parseKind(kindOption) {
@@ -75,6 +75,21 @@
   }
 }
 
+int _parseLineLength(String lengthOption) {
+  var length = _toInt(lengthOption);
+  if (length == null) {
+    var val = lengthOption.toUpperCase();
+    if (val == 'INF' || val == 'INFINITY') {
+      length = -1;
+    } else {
+      throw new FormatterException('Line length is specified as an Integer or '
+          'the value "Inf".');
+    }
+  }
+  return length;
+}
+
+
 Selection _parseSelection(selectionOption) {
   if (selectionOption != null) {
     var units = selectionOption.split(',');
@@ -159,10 +174,11 @@
   parser.addFlag(TRANSFORM_FLAG, abbr: 't', negatable: false,
       help: 'Perform code transformations.');
   parser.addOption(MAX_LINE_FLAG, abbr: 'l', defaultsTo: '80',
-      help: 'Wrap lines longer than this length.');
+      help: 'Wrap lines longer than this length. '
+            'To never wrap, specify "Infinity" or "Inf" for short.');
   parser.addOption(KIND_FLAG, abbr: 'k', defaultsTo: 'cu',
-      help: 'Specify source snippet kind ("stmt" or "cu")'
-            ' --- [PROVISIONAL API].', hide: true);
+      help: 'Specify source snippet kind ("stmt" or "cu") '
+            '--- [PROVISIONAL API].', hide: true);
   parser.addOption(SELECTION_FLAG, abbr: 's',
       help: 'Specify selection information as an offset,length pair '
             '(e.g., -s "0,4").', hide: true);