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#!/bin/bash
if [ -z "$1" ]; then
echo "Usage: $0 [-v/--version PYTHON_VERSION] <directory>"
echo ""
echo "Makes sure that all Python scripts use the right python command."
echo "PYTHON_VERSION: either 2 or 3 (default = 2)."
echo
echo "Note that according to PEP 394, developers should use \"python\" in
the shebang line for code compatible with both Python 2 and 3, but
since this may not be the case, we always overwrite the shebang line.
For more information: http://legacy.python.org/dev/peps/pep-0394/"
exit 1
fi
# Default Python version: 2
PYTHON_VERSION=2
while [[ $# > 1 ]]
do
key="$1"
shift
case $key in
-v|--version)
PYTHON_VERSION="$1"
shift
;;
*)
# unknown option
;;
esac
done
# Check user input
if [[ "$PYTHON_VERSION" != "2" && "$PYTHON_VERSION" != "3" ]]; then
echo "Error: invalid Python version given: $PYTHON_VERSION"
exit 2
fi
for file in $(grep -rl -e 'env python *$' -e 'bin/python *$' $1); do
if [ -z "$file" ]; then
echo "Error finding files."
exit 1
fi
sed -i "s,env python *$,env python${PYTHON_VERSION},g" $file
sed -i "s,/usr/bin/python *$,/usr/bin/env python${PYTHON_VERSION},g" $file
done
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