#!/bin/bash
# Copyright 2017 The Fuchsia Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

### Run Ninja to build Fuchsia

## usage: fx build [-SWITCH...] [zircon/TARGET | TARGET ...]
##
## This runs Ninja, usually twice: once for Zircon and once for Fuchsia.
## With no explicit targets, Zircon Ninja builds its default targets and
## then Fuchsia Ninja builds its default targets.
##
## For each `zircon/TARGET` argument, `TARGET` is passed to Zircon Ninja.
## For each other `TARGET` argument, `TARGET` is passed to Fuchsia Ninja.
## If all the target arguments are `zircon/TARGET`, Fuchsia Ninja is not run.
##
## Switch arguments are passed through to Ninja (same switches for both).
## Run `fx build -h` to see Ninja argument details.

source "$(cd "$(dirname "${BASH_SOURCE[0]}")" >/dev/null 2>&1 && pwd)"/lib/vars.sh || exit $?
fx-config-read

function run-ninja {
  # Use a subshell because fx-cmd-locked locks until exit, not function return.
  (fx-run-ninja "${FUCHSIA_DIR}/buildtools/ninja" "$@") || exit
}

function main {
  local switches=() zircon_targets=() fuchsia_targets=()
  while [ $# -gt 0 ]; do
    case "$1" in
      # These Ninja switches take an argument.
      -[Cfjkldtv])
        switches+=("$1" "$2")
        shift
        ;;
      -*)
        switches+=("$1")
        ;;
      zircon/*)
        zircon_targets+=("${1#zircon/}")
        ;;
      *)
        fuchsia_targets+=("$1")
        ;;
    esac
    shift
  done

  if [ ! -d "$ZIRCON_BUILDROOT" ]; then
    echo >&2 "Re-running gn gen first (missing $ZIRCON_BUILDROOT)"
    fx-gen || return
  fi

  # Build requested Zircon targets.
  # Add default if building any Fuchsia targets.
  if [ ${#fuchsia_targets[@]} -ne 0 ]; then
    zircon_targets+=(default)
  fi
  run-ninja -C "${ZIRCON_BUILDROOT}" "${switches[@]}" "${zircon_targets[@]}"

  # If there were explicit Zircon targets and no other explicit targets,
  # the Zircon run was enough by itself.  Otherwise Zircon default is
  # a prerequisite for any Fuchsia target (including implicit default).
  if [ ${#fuchsia_targets[@]} -ne 0 -o ${#zircon_targets[@]} -eq 0 ]; then
    run-ninja -C "${FUCHSIA_BUILD_DIR}" "${switches[@]}" "${fuchsia_targets[@]}"
  fi
}

main "$@"