gae: Use python instead of sed for removing imports (fixes #25)

The '-i' option is not compatible between GNU and BSD sed.

devscripts/gae-clean-imports.py

@@ -0,0 +1,21 @@
+from __future__ import unicode_literals
+
+import sys
+import re
+from codecs import open
+
+filename = sys.argv[1]
+
+with open(filename, 'rt', encoding='utf-8') as f:
+    lines = list(f.readlines())
+
+# This modules are not availabe in GAE, we don't use any of the functions
+# that require them
+forbidden_modules = ['fcntl', 'ctypes', 'netrc', 'ctypes']
+new_lines = (re.sub(
+    r'import ({})'.format('|'.join(map(re.escape, forbidden_modules))),
+    r'()# Removed \1 import',
+    l) for l in lines)
+
+with open(filename, 'wt', encoding='utf-8') as f:
+    f.writelines(new_lines)

devscripts/gae-patch-youtube-dl.sh

@@ -1,10 +1,5 @@
 #!/bin/bash
 
-# This modules are not availabe in GAE, we don't use any of the functions
-# that required them
-forbidden_cmodules="fcntl ctypes netrc ctypes"
-for module in ${forbidden_cmodules}; do
-    for f in **/*.py *.py; do
-        sed -i '' "s/import ${module}/()# Removed ${module} import/g" "$f"
-    done
+for f in **/*.py *.py; do
+    python "${root}/devscripts/gae-clean-imports.py" "$f"
 done

devscripts/setup-gae.sh

@@ -1,6 +1,7 @@
 #!/bin/sh
 
 root=$(pwd)
+export root
 GAE_DIR=./gae
 BUILD_DIR=${GAE_DIR}/build
 LIB_DIR=${GAE_DIR}/lib