Elm installation script

elm-install.sh

#!/bin/sh

echo "************** Elm Installer version 0.0.1 **************"

PLATFORM=`uname -m`

BINARY_URL_PREFIX="http://JoeyEremondi.github.io/elm-linux-binaries/$PLATFORM"

INSTALL_DIR= ~/.elm-install

#Default values for version: latest
VERSION="latest"

if [ $VERSION == "latest" ]
then
  VERSION=`wget -O - -o /dev/null  http://eremondi.com/elm-linux-binaries/latest | cat`
fi

#Default value for action: install
ACTION="install"

#By default, try to install to global location
GLOBALINSTALL="true"

#TODO
VERSION_FILE_PATH=""
#TODO
GLOBAL_BINARY_PATH="/usr/bin"

#All the different binaries to install
PREFIXES="elm elm-server elm-get elm-doc elm-repl"

#Make the install directory if it doesn't exist

if [ ! -d "./$INSTALL_DIR" ]; then
  cd ~
  mkdir ./$INSTALL_DIR
fi

cd "$INSTALL_DIR"

#Options:
# -v VERSION
#   the version to install or uninstall, default is "latest"
# -i
#   install the given version
# -u
#   uninstall the given version
# -s
#   set the current version as the default, global version. Incompatible with -l
# -l
#   local installation only, do not attempt to add binaries to /usr/share/bin

while getopts "v:iuls" opt; do
  case $opt in
    u)
      echo "Uninstalling..."
      ACTION="uninstall"
      ;;
    l)
      echo "Skipping global installation, installing for one user only"
      GLOBALINSTALL="false"
      ;;
    v)
      echo "Selected version $OPTARG"
      VERSION="$OPTARG"
      ;;
    s)
      echo "Updating default version"
      ACTION="setversion"
      ;;
    \?)
      echo "Invalid option: -$OPTARG" >&2
      exit 1
      ;;
    :)
      echo "Option -$OPTARG requires an argument." >&2
      exit 1
      ;;
  esac
done

#Now we either install or uninstall, depending on argument
if [ "$ACTION" == "install" ] ; then
  #TODO
  echo "Installing"
  if [ ! -d "./version-$VERSION" ]
  then
    echo "Making directory" "./version-$VERSION"
    mkdir "./version-$VERSION"
  fi
  
   for PREFIX in $PREFIXES
    do
      echo "Adding file" "./version-$VERSION/$PREFIX"
      wget "$BINARY_URL_PREFIX/$PREFIX" -O "./version-$VERSION/$PREFIX"
    done
    
elif [ "$ACTION" == "uninstall" ] ; then
  echo "Uninstalling"
  rm -rf ./version-$VERSION
elif [ "$ACTION" == "setversion" ] ; then
  #Modify version file
  echo $VERSION > "$VERSION_FILE_PATH"
fi


#Then, if the flag is set, put wrapper scripts in /usr/bin
if [ "$GLOBALINSTALL" == "true" ]
then
  
  #If the global elm binaries don't exist, create them
  #These are just bash scripts which modify the $PATH
  #then point to the current version
  
  for PREFIX in $PREFIXES
  do
    echo "Adding file" "$GLOBAL_BINARY_PATH/$PREFIX"
    wget "$BINARY_URL_PREFIX/$PREFIX.sh" -O "$GLOBAL_BINARY_PATH/$PREFIX"
    chmod +x "$GLOBAL_BINARY_PATH/$PREFIX"
  done
    
fi

#End