import nake
import os, osproc, strutils

let
  standardOptions = """--skipCfg -d:version:"""" & execProcess("git rev-parse HEAD").strip() & """" kernel.nim"""
  outputFile = "alcedo.bin"
  outputIso = "alcedo.iso"

task "clean", "Removes build files.":
  removeFile("boot.o")
  removeFile("serial.log")
  removeDir("kernel/nimcache")
  removeDir("isodir")
  removeFile(outputFile)
  removeFile(outputIso)
  echo "Done."

task "bootloader", "Builds the bootloader.":
  echo "Building bootloader."
  direShell("nasm -felf32 kernel/arch/i386/boot.s -o boot.o")
  echo "Done."

task "build", "Builds the operating system.":
  runTask("clean")
  runTask("bootloader")
  echo "Compiling and linking."
  withDir("kernel"):
    direShell("nim cc -o:../" & outputFile, standardOptions)
  runTask("check-multiboot")
  echo "Done."

task "build-release", "Builds the operating system, release mode.":
  runTask("clean")
  runTask("bootloader")
  echo "Compiling and linking (release mode)."
  withDir("kernel"):
    direShell("nim cc -d:release -o:../" & outputFile, standardOptions)
  runTask("check-multiboot")
  echo "Done."

task "check-multiboot", "Checks the grub multiboot header.":
  echo "Checking multiboot."
  direShell("grub-file --is-x86-multiboot", outputFile)
  echo "Multibook check successful."

task "build-disc", "Creates an ISO with the GRUB bootloader.":
  removeDir("isodir")
  createDir("isodir/boot/grub")
  copyFile(outputFile, "isodir/boot/kernel")
  copyFile("grub.cfg", "isodir/boot/grub/grub.cfg")
  if not shell("grub-mkrescue -o ", outputIso, " isodir"):
    direShell("grub2-mkrescue -o ", outputIso, " isodir")

task "debug", "Runs the operating system using QEMU with debug build and flags.":
  runTask("build")
  runTask("build-disc")
  echo "Running in Qemu."
  direShell("qemu-system-i386 -drive format=raw,file=" & outputIso ,"-serial stdio -no-reboot -no-shutdown -d int,cpu_reset")

task "run", "Runs the operating system using QEMU.":
  runTask("build-release")
  runTask("build-disc")
  echo "Running in Qemu."
  direShell("qemu-system-i386 -drive format=raw,file=" & outputIso ,"-serial stdio")