abuild

#!/bin/bash

die() {
  echo "$@"
  exit 1
}

has_word() {
  keyword="$1"
  shift
  grep -qw -- "$keyword" <(echo "$@")
}

glob_exists() {
  compgen -G "$1" &>/dev/null
}

if has_word "-h" "$@"; then
  cat <<EOL
Usage: $0 [debug|release]

Try to detect build method and automatically build the files.
Currently only supports Qt .pro and CMakeList.txt with make

Options:
  debug       If provided, will force debug build type.
  release     If provided, will force release build type.
EOL
  exit 1
fi

if ! echo "$PATH" | grep -q ccache; then
  ccache_path=/usr/lib/ccache
  [ -d "$ccache_path/bin" ] &&
    ccache_path=/usr/lib/ccache/bin
      PATH="$ccache_path:$PATH"
fi

build_dir=".build"
source_dir="$(realpath --relative-to "$build_dir" ".")"

if [ -f CMakeLists.txt ]; then
  PREBUILD_DEBUG_FLAG="-DCMAKE_BUILD_TYPE=Debug"
  PREBUILD_RELEASE_FLAG="-DCMAKE_BUILD_TYPE=Release"
  PREBUILD_COMMAND=( "cmake" "$source_dir" )
  BUILD_COMMAND="make"
elif glob_exists "*.pro"; then
  PREBUILD_DEBUG_FLAG="CONFIG+=debug"
  PREBUILD_RELEASE_FLAG="CONFIG+=release"
  PREBUILD_COMMAND=("qmake" "$source_dir")
  BUILD_COMMAND="make"
fi

if has_word "debug" "$@" && has_word "release" "$@"; then
  die "Only one build type allowed, but multiple provided"
fi

if has_word "debug" "$@"; then
  PREBUILD_COMMAND+=("$PREBUILD_DEBUG_FLAG")
elif has_word "release" "$@"; then
  PREBUILD_COMMAND+=("$PREBUILD_RELEASE_FLAG")
fi

mkdir -p "$build_dir"
(
  if ! cd "$build_dir"; then
    die "Failed to enter build directory."
  fi
  "${PREBUILD_COMMAND[@]}"
  $BUILD_COMMAND
)