#!/usr/bin/env bash
# Copyright (c) 2016-present, Facebook, Inc. All rights reserved.

# rebuild is a reasonbuild wrapper that builds reason files
# it calls into ocamlbuild, telling it to call a special
# command 'reopt' and 'rec' which links custom reasson build
# rules.


setglobal DIR = $[ cd $[ dirname $(BASH_SOURCE[0])] && pwd]

setglobal REOPT = ''""

setglobal REC = ''""

if [[ -f $DIR/reopt.sh ]]
{
    setglobal REOPT = ""$DIR/reopt.sh""
}

if [[ -f $DIR/reopt ]]
{
    setglobal REOPT = ""$DIR/reopt""
}

if test -z $REOPT
{
    echo "Couldn't find reopt"
    exit 1
}

if [[ -f $DIR/rec.sh ]]
{
    setglobal REC = ""$DIR/rec.sh""
}

if [[ -f $DIR/rec ]]
{
    setglobal REC = ""$DIR/rec""
}

if test -z $REC
{
    echo "Couldn't find rec"
    exit 1
}

# Since we need to override -ocamlopt and -ocaml, we parse the user passed-in
#  -ocamlopt and -ocamlc here and rebuild it in reopt and rec

setglobal OCAMLOPTIDX = '-1'
setglobal OCAMLCIDX = '-1'
setglobal USEOCAMLFIND = '-1'

# find ocamlopt in argument list
setglobal i = '1'
for var in [@Argv]
{
    if [[ $var = "-ocamlopt" ]]
    {
        setglobal OCAMLOPTIDX = $i
    }

    if [[ $var = "-ocamlc" ]]
    {
        setglobal OCAMLCIDX = $i
    }

    if [[ $var = "-use-ocamlfind" ]]
    {
        setglobal USEOCAMLFIND = '1'
    }
    setglobal i = "$i+1"
}

# found ocamlopt, parsing
setglobal OCAMLOPT = '"ocamlopt.opt'"
if [[ $OCAMLOPTIDX -ne -1 ]]
{
    # The argument after "-ocamlopt" will be parsed into reopt as ocamlopt to be used
    setglobal VALUEIDX = $shExpr('OCAMLOPTIDX+1')
    setglobal OCAMLOPT = $(!VALUEIDX)
    # Remove the parsed argument out of argument list
    set -- $(@:1:OCAMLOPTIDX-1) $(@: VALUEIDX+1)
}

# found ocamlc, parsing
setglobal OCAMLC = '"ocamlc.opt'"
if [[ $OCAMLCIDX -ne -1 ]]
{
    # The argument after "-ocamlc" will be parsed into rec as ocamlc to be used
    setglobal VALUEIDX = $shExpr('OCAMLCIDX+1')
    setglobal OCAMLC = $(!VALUEIDX)
    # Remove the parsed argument out of argument list
    set -- $(@:1:OCAMLCIDX-1) $(@: VALUEIDX+1)
}

if [[ $USEOCAMLFIND -ne -1 ]]
{
    env OCAMLFIND_COMMANDS="ocamlopt=$REOPT ocamlc=$REC" reasonbuild @Argv
} else {
   # pass OCAMLOPT as an environment variable
   reasonbuild -ocamlopt "env OCAMLOPT=\"$OCAMLOPT\" $REOPT" -ocamlc "env OCAMLC=\"$OCAMLC\" $REC" @Argv
}