Add feature to make libs importable

libs/util.py

@@ -0,0 +1,60 @@
+
+import subprocess
+import sys
+import os
+
+__all__ = [
+    'module_root',
+    'add_path',
+]
+
+
+def module_root(module=__file__):
+    try:
+        path = module.__file__
+    except AttributeError:
+        path = module
+    directory = os.path.dirname(path)
+    parent = os.path.join(directory, os.pardir)
+    absolute = os.path.abspath(parent)
+    normalized = os.path.normpath(absolute)
+    return normalized
+
+
+def add_path(path, index=0):
+    sys.path.insert(index, path)
+    try:
+        sys.path.index(path)
+    except ValueError:
+        return
+    else:
+        return path
+
+
+def install_requirements(
+        requirements,
+        upgrade=True,
+        path=None,
+        file=False,
+        executable=sys.executable,
+):
+
+    args = [
+        executable,
+        '-m',
+        'pip',
+        'install',
+    ]
+
+    if file:
+        args.append('-r')
+    args.append(requirements)
+
+    if upgrade:
+        args.append('--upgrade')
+
+    if path is not None:
+        args.append('--target')
+        args.append(path)
+
+    subprocess.call(args)