nim-raft/misc/test_macro.nim

# nim-raft
# Copyright (c) 2023 Status Research & Development GmbH
# Licensed under either of
#  * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE))
#  * MIT license ([LICENSE-MIT](LICENSE-MIT))
# at your option.
# This file may not be copied, modified, or distributed except according to
# those terms.

import std/times
import vm_compile_info
import macros, strutils, os, unittest2, osproc
import threadpool

export strutils, os, unittest2, osproc, threadpool

# AppVeyor may go out of memory with the default of 4
setMinPoolSize(2)

proc executeMyself(numModules: int, names: openArray[string]): int =
  let appName = getAppFilename()
  var elpdList = newSeq[Duration](numModules)
  for i in 0..<numModules:
    let start = getTime()
    let execResult = execCmd(appName & " " & $i)
    let elpd = getTime() - start
    elpdList[i] = elpd
    if execResult != 0:
      stderr.writeLine("subtest no: " & $i & " failed: " & names[i])
    result = result or execResult

  var f = open("all_test.md", fmWrite)
  for i in 0..<numModules:
    f.write("* " & names[i])
    f.write("  - " & $elpdList[i])
    f.write("\n")
  f.close()

proc getImportStmt(stmtList: NimNode): NimNode =
  result = stmtList[0]
  result.expectKind nnkImportStmt

proc ofStmt(idx: int, singleModule: NimNode): NimNode =
  # remove the "test_" prefix
  let moduleName = normalize(singleModule.toStrLit.strVal).substr(4)
  let moduleMain = newIdentNode(moduleName & "Main")

  # construct `of` branch
  # of idx: moduleMain()
  result = nnkOfBranch.newTree(
    newLit(idx),
    newCall(moduleMain)
  )

proc toModuleNames(importStmt: NimNode): NimNode =
  result = nnkBracket.newTree
  for singleModule in importStmt:
    let x = normalize(singleModule.toStrLit.strVal)
    result.add newLit(x)

macro cliBuilder*(stmtList: typed): untyped =
  let importStmt = stmtList.getImportStmt
  let moduleCount = importStmt.len
  let moduleNames = importStmt.toModuleNames

  # case paramStr(1).parseInt
  var caseStmt = nnkCaseStmt.newTree(
    quote do: paramStr(1).parseInt
  )

  # of 0: codeStreamMain()
  # of 1: gasMeterMain()
  # of 2: memoryMain()
  # ...
  for idx, singleModule in importStmt:
    caseStmt.add ofStmt(idx, singleModule)

  # else:
  #   echo "invalid argument"
  caseStmt.add nnkElse.newTree(
    quote do: echo "invalid argument"
  )

  result = quote do:
    if paramCount() == 0:
      const names = `moduleNames`
      quit(executeMyself(`moduleCount`, names))
    else:
      `caseStmt`

# if you want to add new test module(s)
# make sure you define an entry poin
# e.g.
# proc mytestMain*() =
#   # put anything you want here
# and then give it a name `test_mytest.nim`
# the `mytest` part should match between
# the proc name and the module name

# if this executable called without any params
# it will execute each of the test by executing itself
# repeatedly until all sub-tests are executed.
# you can execute the sub-test by a number start from zero.