install.sh

#!/bin/sh

set -e # exit on error

usage()
{
    echo "Fortran Package Manager Bootstrap Script"
    echo ""
    echo "USAGE:"
    echo "./install.sh [--help] [--prefix=PREFIX] [--openmp | --no-openmp]"
    echo ""
    echo " --help             Display this help text"
    echo " --prefix=PREFIX    Install binary in 'PREFIX/bin'"
    echo "                    Default prefix='\$HOME/.local'"
    echo " --openmp           Build fpm with OpenMP support (default)"
    echo " --no-openmp        Build fpm without OpenMP support"
    echo ""
    echo "FC and FFLAGS environment variables can be used to select the"
    echo "Fortran compiler and the build flags."
    echo ""
    echo "FPM_OPENMP env var sets the default for --openmp/--no-openmp."
    echo "Accepted truthy values: 1, true, yes, on (default if unset)."
    echo "Accepted falsy values:  0, false, no, off."
    echo "Command-line flags override FPM_OPENMP."
    echo ""
}

# Return a download command
get_fetch_command()
{
    if command -v curl > /dev/null 2>&1; then
        echo "curl -L"
    elif command -v wget > /dev/null 2>&1; then
        echo "wget -O -"
    else
        echo "No download mechanism found. Install curl or wget first."
        return 1
    fi
}

# Return value of the latest published release on GitHub, with no heading "v" (e.g., "0.7.0")
get_latest_release()
{
     $2 "https://api.github.com/repos/$1/releases/latest" | # Get latest release from GitHub api
     grep '"tag_name":'        |                            # Get tag line
     sed -E 's/.*"([^"]+)".*/\1/' |                         # Pluck JSON value
     sed -E 's/^v//'                                        # Remove heading "v" if present
}

PREFIX="$HOME/.local"

# OpenMP default: env var FPM_OPENMP, else "on"
case "${FPM_OPENMP:-1}" in
    0|false|no|off|FALSE|No|NO|Off|OFF) OPENMP=0 ;;
    1|true|yes|on|TRUE|Yes|YES|On|ON|"") OPENMP=1 ;;
    *)
        echo "ERROR: unrecognized FPM_OPENMP value '$FPM_OPENMP'"
        usage
        exit 1
        ;;
esac

while [ "$1" != "" ]; do
    PARAM=$(echo "$1" | awk -F= '{print $1}')
    VALUE=$(echo "$1" | awk -F= '{print $2}')
    case $PARAM in
        -h | --help)
            usage
            exit
            ;;
        --prefix)
            PREFIX=$VALUE
            ;;
        --openmp)
            OPENMP=1
            ;;
        --no-openmp)
            OPENMP=0
            ;;
        *)
            echo "ERROR: unknown parameter \"$PARAM\""
            usage
            exit 1
            ;;
    esac
    shift
done

set -u # error on use of undefined variable

# Get download command
FETCH=$(get_fetch_command)
if [ $? -ne 0 ]; then
  echo "No download mechanism found. Install curl or wget first."
  exit 2
fi

# Use 0.13.0 to bootstrap (first release with the features system,
# which fpm.toml depends on for the openmp metapackage feature).
BOOTSTRAP_RELEASE="0.13.0"
SOURCE_URL="https://github.com/fortran-lang/fpm/releases/download/v${BOOTSTRAP_RELEASE}/fpm-${BOOTSTRAP_RELEASE}.F90"
BOOTSTRAP_DIR="build/bootstrap"

if [ -z ${FC+x} ]; then
    FC="gfortran"
fi
if [ -z ${FFLAGS+x} ]; then
    FFLAGS="-g -fbacktrace -O3"
fi

mkdir -p $BOOTSTRAP_DIR

$FETCH $SOURCE_URL > $BOOTSTRAP_DIR/fpm.F90

SAVEDIR="$(pwd)"
cd $BOOTSTRAP_DIR
$FC $FFLAGS fpm.F90 -o fpm
cd "$SAVEDIR"

FEATURES_FLAG=""
if [ "$OPENMP" = "1" ]; then
    FEATURES_FLAG="--features openmp"
fi

$BOOTSTRAP_DIR/fpm update
$BOOTSTRAP_DIR/fpm install $FEATURES_FLAG --compiler "$FC" --flag "$FFLAGS" --prefix "$PREFIX"
rm -r $BOOTSTRAP_DIR