#!/bin/bash

if [ -z $TERMUX_ORIGINAL_CMAKE ]; then
    SCRIPTPATH="$( cd -- "$(dirname "$0")" >/dev/null 2>&1 ; pwd -P )"
    TERMUX_ORIGINAL_CMAKE="$SCRIPTPATH/cmake.orig"
fi

# Need to move --build argument to first due to following error:
#  CMake Error: Unknown argument --build
#  CMake Error: Run 'cmake --help' for all supported options.
HAS_BUILD=false
for arg in "$@"; do
    if [ "$arg" == "--build" ]; then
        HAS_BUILD=true
    fi
done

if ! $HAS_BUILD; then
    $TERMUX_ORIGINAL_CMAKE "$@"
    exit $?
fi


BUILD_FLAG=false
BUILD_VALUE=
NEW_ARGS=()
UPDATE_CMAKE_CACHE=()
for arg in "$@"
do
    if [ "$arg" == "--build" ]; then
        BUILD_FLAG=true
    else
        if $BUILD_FLAG; then
            BUILD_VALUE="$arg"
            BUILD_FLAG=false
        else
            case "$arg" in
                -D*=*)
                    UPDATE_CMAKE_CACHE+=("${arg:2}")
                    ;;
                *)
                    NEW_ARGS+=("$arg")
                    ;;
            esac
        fi
    fi
done

if [ ! -z $BUILD_VALUE ]; then
    NEW_ARGS=(--build "$BUILD_VALUE" "${NEW_ARGS[@]}")
fi

function update_cmake_cache() {
    [ ${#UPDATE_CMAKE_CACHE[@]} -eq 0 ] && return
    [ -z $BUILD_VALUE ] && return
    if [ -f "$BUILD_VALUE/CMakeCache.txt" ]; then
        rm -rf "$BUILD_VALUE/.tmp-orig.CMakeCache.tmp"
        cp "$BUILD_VALUE/CMakeCache.txt" "$BUILD_VALUE/.tmp-orig.CMakeCache.tmp"
        cat "$BUILD_VALUE/.tmp-orig.CMakeCache.tmp" | sed -E "$(python3 -c 'import os, sys
def z(x): return x.replace("/","\\/")
for a in sys.argv[2:]: print("-e s/^"+z(a.split("=",1)[0])+":(.*)=.*$/"+z(a.split("=",1)[0])+":\\1="+z(a.split("=",1)[1])+"/g", end=" ")
' -- "${UPDATE_CMAKE_CACHE[@]}")" > "$BUILD_VALUE/CMakeCache.txt"
    fi
}

function undo_update_cmake_cache() {
    [ ${#UPDATE_CMAKE_CACHE[@]} -eq 0 ] && return
    [ -z $BUILD_VALUE ] && return
    [ ! -f "$BUILD_VALUE/.tmp-orig.CMakeCache.tmp" ] && return
    mv -f "$BUILD_VALUE/.tmp-orig.CMakeCache.tmp" "$BUILD_VALUE/CMakeCache.txt"
}

update_cmake_cache
trap undo_update_cmake_cache EXIT


$TERMUX_ORIGINAL_CMAKE "${NEW_ARGS[@]}"