Add PCB interface

this incorporates some of @chintal's layers.py changes
PCB.from_directory() simplifies loading of multiple gerbers
the PCB() class should be pretty helpful going forward...

the context classes could use some cleaning up, although I'd like to wait until the freecad stuff gets merged, that way we can try to refactor the context base to support more use cases

1 files changed, 15 insertions, 1 deletions

diff --git a/gerber/utils.py b/gerber/utils.py
index 1c0af52..6653683 100644
--- a/gerber/utils.py
+++ b/gerber/utils.py
@@ -26,6 +26,7 @@ files.
 # Author: Hamilton Kibbe <ham@hamiltonkib.be>
 # License:
 
+import os
 from math import radians, sin, cos
 from operator import sub
 
@@ -219,7 +220,10 @@ def detect_file_format(data):
         if 'M48' in line:
             return 'excellon'
         elif '%FS' in line:
-            return'rs274x'
+            return 'rs274x'
+        elif ((len(line.split()) >= 2) and
+             (line.split()[0] == 'P') and (line.split()[1] == 'JOB')):
+            return 'ipc_d_356'
     return 'unknown'
 
 
@@ -288,3 +292,13 @@ def rotate_point(point, angle, center=(0.0, 0.0)):
     x = center[0] + (cos(angle) * xdelta) - (sin(angle) * ydelta)
     y = center[1] + (sin(angle) * xdelta) - (cos(angle) * ydelta)
     return (x, y)
+
+
+def listdir(directory, ignore_hidden=True, ignore_os=True):
+    os_files = ('.DS_Store', 'Thumbs.db', 'ethumbs.db')
+    files = os.listdir(directory)
+    if ignore_hidden:
+        files = [f for f in files if not f.startswith('.')]
+    if ignore_os:
+        files = [f for f in files if not f in os_files]
+    return files