make binder directory visible

repo2docker/detectors.py

@@ -332,8 +332,8 @@ class BuildPack(LoggingConfigurable):
 
     def binder_path(self, path):
         """Locate a file"""
-        if os.path.exists('.binder'):
+        if os.path.exists('binder'):
-            return os.path.join('.binder', path)
+            return os.path.join('binder', path)
         else:
             return path
 

tests/conda/binder-dir/Dockerfile

@@ -1,2 +1,2 @@
 FROM doesntmatter
-# this file should be ignored because there's a .binder dir
+# this file should be ignored because there's a binder dir

tests/conda/binder-dir/README.rst

@@ -1,4 +1,4 @@
 Binder Directory
 ----------------
 
-top-level Dockerfile will be ignored if .binder/environment.yml exists.
+top-level Dockerfile will be ignored if binder directory exists.

tests/dockerfile/binder-dir/README.rst

@@ -1,4 +1,4 @@
 Binder Directory
 ----------------
 
-top-level Dockerfile will be ignored if .binder/Dockerfile exists.
+top-level Dockerfile will be ignored if binder directory exists.

tests/venv/binder-dir/README.rst

@@ -1,4 +1,4 @@
 Binder Directory
 ----------------
 
-top-level environment.yml will be ignored if .binder/requiremets.txt exists.
+top-level environment.yml will be ignored if binder directory exists.