erlvm-installer

#!/usr/bin/env bash

erlvm_fatal() {
	tput sgr0
	tput setaf 1 # Red color
    echo "[ERROR] $1" >&2
	tput sgr0
	exit 1
}

erlvm_error() {
	tput sgr0
	tput setaf 1 # Red color
    echo "[ERROR] $1" >&2
	tput sgr0
}

erlvm_warn() {
	tput sgr0
	tput setaf 3 # Yellow color
    echo "[WARN] $1" >&1
	tput sgr0
}

erlvm_info() {
	tput sgr0
	tput setaf 2 # Green color
    echo "[INFO] $1" >&1
	tput sgr0
}

erlvm_dev_info() {
	tput sgr0
	tput setaf 2 # Green color
    if [[ -n $ERLVM_DEV ]]; then
        echo "[INFO] $(date +'%Y-%m-%dT%H:%M:%S%z'): $@" >&1
    else
        echo "[INFO] $(date +'%Y-%m-%dT%H:%M:%S%z'): $@" > /dev/null
    fi
	tput sgr0
}

erlvm_echo() {
    tput sgr0
	tput setaf 4 # Blue color
    echo "$1" >&1
	tput sgr0
}

erlvm_success_echo() {
    tput sgr0
    tput setaf 5
    echo "$1" >&1
    tput sgr0
}

erlvm_message() {
    tput sgr0
    tput setaf 2 # Green color
    echo "$1" >&1
    tput sgr0
}

update_profile() {
	[ -f "$1" ] || return 1

	grep -F "$source_line" "$1" > /dev/null 2>&1
	if [ $? -ne 0 ]; then
		echo -e "\n$source_line" >> "$1"
	fi
}

welcome_to_erlvm() {
    v1=${ERLVM_VERSION}
    erlvm_echo "#######################################################################"
    erlvm_echo "#                                                                     #"
    erlvm_echo "#    Congratulations! erlvm v${v1} has been installed successfully.   #"
    erlvm_echo "#      Welcome to use erlvm tool to manage your erlang versions!      #"
    erlvm_echo "#                                                                     #"
    erlvm_echo "#######################################################################"

    cat << "EOF"

                          ,--,                      ____ 
                        ,--.'|                    ,'  , `.
                 __  ,-.|  | :                 ,-+-,.' _ |
               ,' ,'/ /|:  : '       .---.  ,-+-. ;   , ||
        ,---.  '  | |' ||  ' |     /.  ./| ,--.'|'   |  ||
      /     \  |  |   ,''  | |   .-' . ' ||   |  ,', |  |,
     /    /  | '  :  /  |  | :  /___/ \: ||   | /  | |--'
    .    ' / | |  | '   '  : |__.   \  ' .|   : |  | ,
    '   ;   /| ;  : |   |  | '.'|\   \   '|   : |  |/
    '   |  / | |  , ;   ;  :    ; \   \   |   | |`-'
    |   :    | ---'     |  ,   /   \   \ ||   ;/ 
     \   \  /            ---`-'     '---" '---'       by keonjeo
      `----'

EOF
}

BRANCH=${1:-master}
ERLVM_DEST=${2:-$HOME}
ERLVM_NAME="erlvm"
SRC_REPO=${SRC_REPO:-https://github.com/keonjeo/erlvm.git}

[[ "$ERLVM_DEST" = "$HOME" ]] && ERLVM_NAME=".erlvm"
[[ -d "$ERLVM_DEST/$ERLVM_NAME" ]] && erlvm_warn "Already installed! Remove old installation by running the following command:

    rm -rf $ERLVM_DEST/$ERLVM_NAME"

[[ -d "$ERLVM_DEST/$ERLVM_NAME" ]] && exit 1

[ -d "$ERLVM_DEST" ] || mkdir -p "$ERLVM_DEST" > /dev/null 2>&1 || erlvm_fatal "Failed to create $ERLVM_DEST"
[ -z "$(which git)" ] && erlvm_fatal "Sorry guys. I can't find your git tool in your system.
        Debian / Ubuntu : sudo apt-get install git
        Redhat / Centos : sudo yum install git
                Mac OSX : sudo brew install git
"

[ -z "$(which wget)" ] && erlvm_fatal "Sorry guys. I can't find your wget tool in your system.
        Debian / Ubuntu : sudo apt-get install wget
        Redhat / Centos : sudo yum install wget
                Mac OSX : sudo brew install wget
"

GIT_ROOT=$(git rev-parse --show-toplevel 2>/dev/null)

if [[ -z "$GIT_ROOT" || "$(basename "$GIT_ROOT")" != "erlvm" ]];then
    echo "Cloning from $SRC_REPO to $ERLVM_DEST/$ERLVM_NAME"

    git clone --quiet "$SRC_REPO" "$ERLVM_DEST/$ERLVM_NAME" 2> /dev/null ||
        erlvm_fatal "Failed to clone from $SRC_REPO into $ERLVM_DEST/$ERLVM_NAME"
else
    # Generally speaking, it is impossible for users to reach this branch.
    # For developer to execute erlvm-installer script on the local.
    erlvm_dev_info "==============================="
    erlvm_dev_info "ERLVM_DEST => $ERLVM_DEST"
    erlvm_dev_info "GIT_ROOT  => $GIT_ROOT"
    erlvm_dev_info "==============================="
    if [[ $ERLVM_DEST == *"$GIT_ROOT"* ]]; then # means that you want to install erlvm tool into GIT_ROOT directory
        ln -s "$GIT_ROOT" "$ERLVM_DEST"
    else
        cp -r "$GIT_ROOT" "$ERLVM_DEST/$ERLVM_NAME"
    fi
fi

pushd . > /dev/null
cd "$ERLVM_DEST/$ERLVM_NAME" && git checkout --quiet "$BRANCH" 2> /dev/null
[[ $? -ne 0 ]] && (erlvm_fatal "Failed to checkout $BRANCH branch")
popd > /dev/null

# backup .git directory if exosts .git directory
[ -d "$ERLVM_DEST/$ERLVM_NAME/.git" ] && mv "$ERLVM_DEST/$ERLVM_NAME/.git" "$ERLVM_DEST/$ERLVM_NAME/git.bak"

# Create some directories for ERLVM_HOME
[[ ! -d $ERLVM_DEST/$ERLVM_NAME/erlang ]] && mkdir -p $ERLVM_DEST/$ERLVM_NAME/erlang
[[ ! -d $ERLVM_DEST/$ERLVM_NAME/erlang_tars ]] && mkdir -p $ERLVM_DEST/$ERLVM_NAME/erlang_tars
[[ ! -d $ERLVM_DEST/$ERLVM_NAME/erlang_versions ]] && mkdir -p $ERLVM_DEST/$ERLVM_NAME/erlang_versions
[[ ! -d $ERLVM_DEST/$ERLVM_NAME/erlvm_config ]] && mkdir -p $ERLVM_DEST/$ERLVM_NAME/erlvm_config

# Create the configuration file for ERLVM_HOME
[[ -f $ERLVM_DEST/$ERLVM_NAME/erlvm_config/erlang_default ]] && rm -f $ERLVM_DEST/$ERLVM_NAME/erlvm_config/erlang_default
touch $ERLVM_DEST/$ERLVM_NAME/erlvm_config/erlang_default
erlvm_dev_info "$ERLVM_DEST/$ERLVM_NAME/erlvm_config/erlang_default succesfully created"

[[ -f $ERLVM_DEST/$ERLVM_NAME/erlvm_config/erlang_current ]] && rm -f $ERLVM_DEST/$ERLVM_NAME/erlvm_config/erlang_current
touch $ERLVM_DEST/$ERLVM_NAME/erlvm_config/erlang_current
erlvm_dev_info "$ERLVM_DEST/$ERLVM_NAME/erlvm_config/erlang_current succesfully created"

source_line="[[ -s \"${ERLVM_DEST}/$ERLVM_NAME/scripts/erlvm\" ]] && source \"${ERLVM_DEST}/$ERLVM_NAME/scripts/erlvm\""
source_file="${ERLVM_DEST}/$ERLVM_NAME/scripts/erlvm"

if [ -z "$ERLVM_NO_UPDATE_PROFILE" ]; then
    if [ -n "$ZSH_NAME" ]; then
        update_profile "$HOME/.zshrc"
    elif [ "$(uname)" == "Linux" ]; then
        update_profile "$HOME/.bashrc" || update_profile "$HOME/.bash_profile"
    elif [ "$(uname)" == "Darwin" ]; then
        update_profile "$HOME/.profile" || update_profile "$HOME/.bash_profile"
    fi
fi

if [ -z "$ERLVM_NO_UPDATE_PROFILE" ] && [ "$?" != "0" ]; then
	erlvm_warn "Unable to locate profile settings file (Something like $HOME/.bashrc or $HOME/.bash_profile)"
	erlvm_warn ""
	erlvm_warn " You will have to manually add the following line:"
	erlvm_warn ""
	erlvm_warn "  $source_line"
	erlvm_warn ""
fi

echo "#!/usr/bin/env bash\n" > "$ERLVM_DEST/$ERLVM_NAME/scripts/erlvm"
echo "export ERLVM_ROOT=$ERLVM_DEST/$ERLVM_NAME" >> "$ERLVM_DEST/$ERLVM_NAME/scripts/erlvm"
echo "export ERLANG_ROOT=$ERLVM_DEST/$ERLVM_NAME/erlang" >> "$ERLVM_DEST/$ERLVM_NAME/scripts/erlvm"
echo "export ERLVM_ROOT_BACKUP=$ERLVM_DEST/$ERLVM_NAME.back" >> "$ERLVM_DEST/$ERLVM_NAME/scripts/erlvm"
echo ". \$ERLVM_ROOT/scripts/default_init" >> "$ERLVM_DEST/$ERLVM_NAME/scripts/erlvm"

[[ -s "$ERLVM_DEST/$ERLVM_NAME/scripts/erlvm" ]] && source "$ERLVM_DEST/$ERLVM_NAME/scripts/erlvm"

welcome_to_erlvm

erlvm_success_echo ""
erlvm_success_echo ""
erlvm_success_echo "Please restart your terminal session, or to get started execute the following command to make it effective."
erlvm_success_echo ""
erlvm_success_echo "       source ${source_file}      "
erlvm_success_echo ""