Setup Debian D development evironment. Installs Sayol's D APT repository (http://d-apt.sourceforge.net/) and prompts to install compilers and DUB.

dapt.sh

#!/bin/bash
# Setup a D development environment on a Debian system.
# Installs the D APT repository and prompts to install compilers DMD, LDC, and
# GDC, and package manager DUB.
# Licence: MIT/Expat.

daptsrc=http://netcologne.dl.sourceforge.net/project/d-apt/files/d-apt.list
daptlist=/etc/apt/sources.list.d/d-apt.list
wget ${daptsrc} -O ${daptlist}

[[ -f ${daptlist} ]] || {
    echo "fatal: couldn't get ${daptlist} from ${daptsrc}"
    exit 1
}

apt-get -y --allow-unauthenticated install --reinstall d-apt-keyring && \
    apt-get update -o Dir::Etc::SourceList="${daptlist}" \
    -o Dir::Etc::SourceParts="-" -o APT::Get::List-Cleanup="0"

echo
pkgs=()

# Prompt to install a package.
# arg1: human readable name.
# arg2: APT package name.
# arg3: Y/N. Optional. Default choice.
prompt_install()
{
    local name=$1
    local package=$2
    local default=${3:-"N"}

    local prompt="Install ${name} ["
    if [[ $default == "Y" ]]; then
        prompt+="Y/n] (yes)? "
    else
        prompt+="y/N] (no)? "
    fi
    read -p "$prompt" -r
    [[ -z $REPLY ]] && REPLY=$default
    [[ $REPLY =~ ^[Yy](es)?$ ]] && pkgs+=("$package")
}

prompt_install "DMD" "dmd-bin" "Y"
prompt_install "LDC" "ldc"
prompt_install "GDC" "gdc"
prompt_install "DUB" "dub" "Y"

[[ ! -z $pkgs ]] && apt-get -y install ${pkgs[@]}
echo "Done."