DevOps-Bash-tools/perl_cpanm_install_if_absent.sh

#!/usr/bin/env bash
#  vim:ts=4:sts=4:sw=4:et
#
#  Author: Hari Sekhon
#  Date: 2019-02-15 13:48:29 +0000 (Fri, 15 Feb 2019)
#
#  https://github.com/harisekhon/bash-tools
#
#  License: see accompanying Hari Sekhon LICENSE file
#
#  If you're using my code you're welcome to connect with me on LinkedIn and optionally send me feedback to help steer this or other code I publish
#
#  https://www.linkedin.com/in/harisekhon
#

set -euo pipefail
[ -n "${DEBUG:-}" ] && set -x

echo "Installing CPAN Modules"

cpan_modules=""
for x in "$@"; do
    if [ -f "$x" ]; then
        echo "adding cpan modules from file:  $x"
        cpan_modules="$cpan_modules $(sed 's/#.*//;/^[[:space:]]*$$/d' "$x")"
        echo
    else
        cpan_modules="$cpan_modules $x"
    fi
    cpan_modules="$(tr ' ' ' \n' <<< "$cpan_modules" | sort -u | tr '\n' ' ')"
done

opts=""
if [ -n "${TRAVIS:-}" ]; then
    echo "running in quiet mode"
    opts="-q"
fi

if [ "$(uname -s)" = "Darwin" ]; then
    # needed to build Crypt::SSLeay
    export OPENSSL_INCLUDE=/usr/local/opt/openssl/include
    export OPENSSL_LIB=/usr/local/opt/openssl/lib
fi

SUDO=""
if [ $EUID != 0 ] &&
   [ -z "${PERLBREW_PERL:-}" ]; then
    SUDO=sudo
fi

for cpan_module in $cpan_modules; do
    perl_module="${cpan_module%%@*}"
    if perl -e "use $perl_module;" &>/dev/null; then
        echo "perl cpan module '$perl_module' already installed, skipping..."
    else
        echo "installing perl cpan module '$perl_module'"
        if [ "$(uname -s)" = "Darwin" ]; then
            # need to send OPENSSL_INCLUDE and OPENSSL_LIB through sudo explicitly
            $SUDO \
                OPENSSL_INCLUDE="$OPENSSL_INCLUDE" \
                OPENSSL_LIB="$OPENSSL_LIB" \
                "${CPANM:-cpanm}" $opts --notest "$cpan_module"
        else
            $SUDO "${CPANM:-cpanm}" $opts --notest "$cpan_module"
        fi
    fi
done