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#!/usr/bin/env bash
# This script serves as the NLTK build step of the
# [**Python Buildpack**](https://github.com/cloudfoundry/python-buildpack)
# compiler.
# This script is invoked by [`bin/compile`](/).
# Syntax sugar.
source $BIN_DIR/utils
# Check that nltk was installed by pip, otherwise obviously not needed
python -m nltk.downloader -h >/dev/null 2>&1
if [ $? -eq 0 ]; then
    puts-step "Downloading NLTK corpora..."
    nltk_packages_definition="$BUILD_DIR/nltk.txt"
    if [ -f "$nltk_packages_definition" ]; then
        nltk_packages=$(tr "\n" " " < "$nltk_packages_definition")
        puts-step "Downloading NLTK packages: $nltk_packages"
        python -m nltk.downloader -d $BUILD_DIR/.cloudfoundry/python/nltk_data $nltk_packages  | indent
        set-env NLTK_DATA "/app/.cloudfoundry/python/nltk_data"
        puts-warn "nltk.txt not found, not downloading any corpora"

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