cmake-easyinstall

#!/usr/bin/env bash
#
# Copyright 2020-2021 Axel Huebl
#
# License: BSD-2-Clause
#
# dependencies: bash, cmake 3.15.0+, git

set -eu -o pipefail

# usage
function print_usage_and_exit() {
    echo "Usage: $0 [--prefix=<dir>] git+<https-url>.git[@branch] [cmake-options]"
    exit 1
}

# environment options
CEI_CMAKE=${CEI_CMAKE:-"cmake"}
CEI_CONFIG=${CEI_CONFIG:-"RelWithDebInfo"}
CEI_PARALLEL=${CEI_PARALLEL:-"2"}
CEI_PREFIX=${CEI_PREFIX:-""}
CEI_SUDO=${CEI_SUDO:-""}
CEI_TMP=${CEI_TMP:-""}

# command line options (take precedence over environment)
if [ "$#" -lt 1 ]; then
    print_usage_and_exit
fi

if [ "${1}" == "--prefix" ] && [ "$#" -lt 3 ]; then
    print_usage_and_exit
fi
if [ "${1::9}" == "--prefix=" ] && [ "$#" -lt 2 ]; then
    print_usage_and_exit
fi
if [ "${1}" == "--prefix" ]; then
    CEI_PREFIX="${2}"
    uri=${3}
    cmake_opts=${@:4}
elif [ "${1::9}" == "--prefix=" ]; then
    CEI_PREFIX="${1:9}"
    uri=${2}
    cmake_opts=${@:3}
else
    uri=${1}
    cmake_opts=${@:2}
fi

# create a temporary build directory
if [ -z "${CEI_TMP}" ]; then
    tmp_dir=$(mktemp --help >/dev/null 2>&1 && mktemp -d -t ci-XXXXXXXXXX || mktemp -d "${TMPDIR:-/tmp}"/ci-XXXXXXXXXX)
    if [ $? -ne 0 ]; then
        echo "Cannot create a temporary directory"
        exit 2
    fi
else
    tmp_dir=${CEI_TMP}
fi
rm -rf ${tmp_dir}/build
mkdir -p ${tmp_dir}/build

# download
git_url=${uri:4}  # crop-off "git+" prefix
# branch provided?
git_branch=""
IFS='@' read -ra git_url_tokens <<< "$git_url"
if [ ${#git_url_tokens[@]} -gt 1 ]; then
    git_url="${git_url_tokens[0]}"
    git_branch="--branch ${git_url_tokens[1]}"
fi

git clone \
  --depth 1 --shallow-submodules \
  ${git_url} ${git_branch} ${tmp_dir}/src

# configure
cd ${tmp_dir}/build
if [ -z "${CEI_PREFIX}" ]; then
    ${CEI_CMAKE} ../src -DCMAKE_BUILD_TYPE=${CEI_CONFIG} ${cmake_opts}
else
    ${CEI_CMAKE} ../src -DCMAKE_BUILD_TYPE=${CEI_CONFIG} -DCMAKE_INSTALL_PREFIX="${CEI_PREFIX}" ${cmake_opts}
fi

# build
${CEI_CMAKE} --build . --config ${CEI_CONFIG} --parallel ${CEI_PARALLEL}

# install
if [ -z "${CEI_SUDO}" ]; then
    ${CEI_CMAKE} --install . --config ${CEI_CONFIG}
else
    ${CEI_SUDO} ${CEI_CMAKE} --install . --config ${CEI_CONFIG}
fi

# remove temporary directory
cd -
rm -rf ${tmp_dir}