Move environment set up to site_scons

site_scons/paths.py

@@ -0,0 +1,30 @@
+# paths.py
+# Eryn Wells <eryn@erynwells.me>
+
+import os
+import os.path
+
+
+def is_executable(path):
+    return os.path.exists(path) and os.access(path, os.X_OK)
+
+
+def which(program):
+    '''
+    Look for `program` in system path and return the full path to that binary if
+    it is found. Otherwise, return `None`.
+    '''
+    path, name = os.path.split(program)
+    if path:
+        if is_executable(program):
+            return program
+    else:
+        pathext = [''] + os.environ.get('PATHEXT', '').split(os.pathsep)
+        for path in os.environ.get('PATH', '').split(os.pathsep):
+            exe = os.path.join(path, program)
+            for ext in pathext:
+                candidate = exe + ext
+                if is_executable(candidate):
+                    return candidate
+    return None
+