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version       = "0.7.0"
author        = "nandi"
description   = "libcosmic behind a C ABI, driven from Nim"
license       = "MIT"
srcDir        = "nim"
installExt    = @["nim", "so"]   # the module, plus the cdylib beside it

requires "nim >= 2.0.0"

# The package version and the cdylib's ABI are the same thing: cosmicnim
# 0.2.0 speaks to the v0.2.0 release and no other. Resolving the tag from
# `version` is what keeps a stale library from loading against new bindings.
const
  BaseUrl = "https://rickub.com/nandi/cosmicnim"
  Target = "x86_64-unknown-linux-gnu"
  LibName = "libcosmic_ffi.so"

proc fetchLibInto(dir: string) =
  # NimScript has no `/` path operator, hence the plain concatenation.
  let
    tag = getEnv("COSMICNIM_TAG", "v" & version)
    url = BaseUrl & "/releases/download/" & tag &
          "/cosmic_ffi-" & tag & "-" & Target & ".tar.gz"
    tmp = dir & "/.cosmicnim-fetch"

  echo "fetching ", tag, " from ", BaseUrl
  rmDir tmp
  mkDir tmp
  exec "curl -fsSL -o '" & tmp & "/asset.tar.gz' '" & url & "'"
  # The workflow publishes a checksum beside every tarball.
  if gorgeEx("curl -fsSL -o '" & tmp & "/asset.sha256' '" &
             url & ".sha256'").exitCode == 0:
    exec "cd '" & tmp & "' && sed 's|  .*|  asset.tar.gz|' asset.sha256 | sha256sum -c -"
  else:
    echo "no .sha256 published alongside the asset; skipping checksum"
  exec "tar xzf '" & tmp & "/asset.tar.gz' -C '" & tmp & "'"
  exec "cp '" & tmp & "'/cosmic_ffi-*/" & LibName & " '" & dir & "/" & LibName & "'"
  rmDir tmp
  echo "installed ", dir & "/" & LibName

task fetchLib, "Download the prebuilt cdylib matching this package version":
  fetchLibInto(srcDir)

before install:
  # Ship the cdylib with the package, fetching it if it is not here yet.
  if not fileExists(srcDir & "/" & LibName):
    fetchLibInto(srcDir)