configure

#!/bin/sh

BIN_DIR=/usr/local/bin
SHARE_DIR=/usr/local/share
VIM_DIR=/usr/local/share/ocamlmerlin/vim
WITH_VIMBUFSYNC="1"
WITH_BIN_ANNOT=""
VERSION_STRING=""

if ! [ -x $(which ocamlfind) ]; then
  echo "OCamlfind is missing. Please install it."
  exit 1
fi

EXIT=0

COL_CLEAR=$(tput sgr0)
COL_RED=$(tput setf 4)
COL_GREEN=$(tput setf 2)

check_package()
{
  if ocamlfind query "$2" >/dev/null 2>/dev/null; then
    printf "Found $2\t${COL_GREEN}GOOD${COL_CLEAR}\n"
  else
    printf "${COL_RED}BAD${COL_CLEAR} $2 is missing\n\t$3\n"
    eval $1=1
  fi
}

usage()
{
    cat <<END
\`configure' configures your Merlin installation.

The options available for better control are as follow:

    --bindir <path>         where to install merlin's executable
                            default: /usr/local/bin

    --sharedir <path>       where the different editor modes will be installed
                            default: /usr/local/share

    --prefix <path>         when given, bindir will be set to '<path>/bin' and
                            sharedir to '<path>/share'

    --vimdir <path>         when given, vim bindings will be installed to '<path>'
                            default: /usr/local/share/ocamlmerlin/vim

    --with-vimbufsync       install vim vimbufsync plugin [default]
    --without-vimbufsync    do not install vim vimbufsync plugin

    --with-bin-annot        compiles merlin with '--bin-annot', useful if you plan
                            to work on merlin itself.

    --enable-compiled-emacs-mode    compiles the emacs mode.
                                    Makes the plugin load slightly faster.

    --with-version-string <str>     Overwrite the version message printed by
                                    merlin when called with -version or -vnum.
END
}

while [ -n "$1" ]; do
  case "$1" in
    --prefix)
      shift 1
      BIN_DIR="$1/bin"
      SHARE_DIR="$1/share"
      VIM_DIR="$SHARE_DIR/ocamlmerlin/vim"
      ;;
    --bindir)
      shift 1
      BIN_DIR="$1"
      ;;
    --sharedir)
      shift 1
      SHARE_DIR="$1"
      ;;
    --vimdir)
      shift 1
      VIM_DIR="$1"
      ;;
    --with-vimbufsync)
      WITH_VIMBUFSYNC="1"
      ;;
    --without-vimbufsync)
      WITH_VIMBUFSYNC=""
      ;;
    --with-bin-annot)
      WITH_BIN_ANNOT="-cflags -bin-annot"
      ;;
    --enable-compiled-emacs-mode)
      ENABLE_COMPILED_EMACS_MODE=true
      ;;
    --with-version-string)
      shift 1
      VERSION_STRING="$1"
      ;;
    --help|-help|-h)
      usage
      exit 0
  esac
  shift 1
done

OCAML_VERSION="ocaml_400"
OCAML_VERSION_MESSAGE="Unknown, defaulting to 4.00.1"

cat <<END
Merlin configuration
--------------------
END

check_package EXIT findlib "Install findlib"
check_package EXIT yojson "Install yojson"
MAGIC_VERSION=$(ocamlfind c -config | grep cmi_magic_number | cut -d' ' -f2)
FULL_VERSION=$(ocamlfind c -version)

case "$MAGIC_VERSION" in
  "Caml1999I015")
    OCAML_VERSION="ocaml_401"
    OCAML_VERSION_MESSAGE="OCaml 4.01.0"
    ;;
  "Caml1999I017")
    OCAML_VERSION="ocaml_402"
    if [ "x$FULL_VERSION" = "x4.02.0" ]; then
      OCAML_VERSION_MESSAGE="OCaml 4.02.0"
      mv src/ocaml_402/typing/typecore.ml src/ocaml_402/typing/typecore.ml.org
      sed -E '/(S|Ignored_s)can_next_char/d' \
        <src/ocaml_402/typing/typecore.ml.org >src/ocaml_402/typing/typecore.ml
      rm src/ocaml_402/typing/typecore.ml.org
    else
      OCAML_VERSION_MESSAGE="OCaml 4.02.1"
    fi
    ;;
  "Caml1999I019")
    OCAML_VERSION="ocaml_trunk"
    OCAML_VERSION_MESSAGE="OCaml 4.03 (trunk)"
    ;;
esac

if [ -e "src/${OCAML_VERSION}.git/.git" ]; then
  OCAML_VERSION="${OCAML_VERSION}.git"
  OCAML_VERSION_MESSAGE="${OCAML_VERSION_MESSAGE} (git version)"
fi

if ocamlfind ocamlopt; then
  NATIVE=true
else
  NATIVE=false
fi

cat <<END

System config:
  OCaml ABI version: $OCAML_VERSION_MESSAGE
  Native code: $NATIVE

Will install:
  ocamlmerlin binary in: $BIN_DIR
  vim mode in: $VIM_DIR
  
To customize directories, use:
  ./configure [--prefix <dir>] [--bindir <dir>] [--sharedir <dir>] [--vimdir <vimdir>] [--with-vimbufsync | --without-vimbufsync]

For more informations rerun with --help.
END

rm -f "$PWD/src/ocaml" 2>&1 >/dev/null &&
  ln -sf "$PWD/src/$OCAML_VERSION" "$PWD/src/ocaml"

mkdir -p "$PWD/src/config"

if [ -d "$BIN_DIR" ]; then

  cat >Makefile.config <<END
BIN_DIR=$BIN_DIR
SHARE_DIR=$SHARE_DIR
VIM_DIR=$VIM_DIR
NATIVE=$NATIVE
WITH_BIN_ANNOT=$WITH_BIN_ANNOT
WITH_VIMBUFSYNC=$WITH_VIMBUFSYNC
ENABLE_COMPILED_EMACS_MODE=$ENABLE_COMPILED_EMACS_MODE
END

  if [ -n "$VERSION_STRING" ]; then
    true
  elif [ -d ".git" ]; then
    VERSION_STRING="git-`git rev-parse HEAD`"
  elif [ -f "CHANGELOG" ]; then
    VERSION_STRING=`head -n1 CHANGELOG | cut -d' ' -f2`
  else
    VERSION_STRING="unknown"
  fi

  echo >src/config/my_config.ml "let version = \"$VERSION_STRING\";;"

  if [ "$EXIT" -eq 0 ]; then
    echo "Now, type 'make' to compile then 'make install'."
  else
    echo "Something bad happened. Check your configuration before trying to 'make'."
  fi
else
  [ -d "$BIN_DIR" ] || echo "'$BIN_DIR' not found or not a directory."
  [ -d "$SHARE_DIR" ] || echo "'$SHARE_DIR' not found or not a directory."
  [ -d "$VIM_DIR" ] || echo "'$VIM_DIR' not found or not a directory."
  echo "Please check configuration."
  exit 1
fi