#
#
#         Maintenance program for Nim
#        (c) Copyright 2017 Andreas Rumpf
#
#    See the file "copying.txt", included in this
#    distribution, for details about the copyright.
#
#    See doc/koch.txt for documentation.
#

const
  NimbleStableCommit = "63695f490728e3935692c29f3d71944d83bb1e83" # master

when not defined(windows):
  const
    Z3StableCommit = "65de3f748a6812eecd7db7c478d5fc54424d368b" # the version of Z3 that DrNim uses

when defined(gcc) and defined(windows):
  when defined(x86):
    {.link: "icons/koch.res".}
  else:
    {.link: "icons/koch_icon.o".}

when defined(amd64) and defined(windows) and defined(vcc):
  {.link: "icons/koch-amd64-windows-vcc.res".}
when defined(i386) and defined(windows) and defined(vcc):
  {.link: "icons/koch-i386-windows-vcc.res".}

import std/[os, strutils, parseopt, osproc]
  # Using `std/os` instead of `os` to fail early if config isn't set up properly.
  # If this fails with: `Error: cannot open file: std/os`, see
  # https://github.com/nim-lang/Nim/pull/14291 for explanation + how to fix.

import tools / kochdocs
import tools / deps

const VersionAsString = system.NimVersion

const
  HelpText = """
+-----------------------------------------------------------------+
|         Maintenance program for Nim                             |
|             Version $1|
|             (c) 2017 Andreas Rumpf                              |
+-----------------------------------------------------------------+
Build time: $2, $3

Usage:
  koch [options] command [options for command]
Options:
  --help, -h               shows this help and quits
  --latest                 bundle the installers with a bleeding edge Nimble
  --stable                 bundle the installers with a stable Nimble (default)
  --nim:path               use specified path for nim binary
Possible Commands:
  boot [options]           bootstraps with given command line options
  distrohelper [bindir]    helper for distro packagers
  tools                    builds Nim related tools
  toolsNoNimble            builds Nim related tools (except nimble)
                           doesn't require network connectivity
  nimble                   builds the Nimble tool
Boot options:
  -d:release               produce a release version of the compiler
  -d:nimUseLinenoise       use the linenoise library for interactive mode
                           `nim secret` (not needed on Windows)
  -d:leanCompiler          produce a compiler without JS codegen or
                           documentation generator in order to use less RAM
                           for bootstrapping

Commands for core developers:
  runCI                    runs continuous integration (CI), eg from travis
  docs [options]           generates the full documentation
  csource -d:release       builds the C sources for installation
  pdf                      builds the PDF documentation
  zip                      builds the installation zip package
  xz                       builds the installation tar.xz package
  testinstall              test tar.xz package; Unix only!
  installdeps [options]    installs external dependency (eg tinyc) to dist/
  tests [options]          run the testsuite (run a subset of tests by
                           specifying a category, e.g. `tests cat async`)
  temp options             creates a temporary compiler for testing
  pushcsource              push generated C sources to its repo
Web options:
  --googleAnalytics:UA-... add the given google analytics code to the docs. To
                           build the official docs, use UA-48159761-1
"""

let kochExe* = when isMainModule: os.getAppFilename() # always correct when koch is main program, even if `koch` exe renamed eg: `nim c -o:koch_debug koch.nim`
               else: getAppDir() / "koch".exe # works for winrelease

proc kochExec*(cmd: string) =
  exec kochExe.quoteShell & " " & cmd

proc kochExecFold*(desc, cmd: string) =
  execFold(desc, kochExe.quoteShell & " " & cmd)

template withDir(dir, body) =
  let old = getCurrentDir()
  try:
    setCurrentDir(dir)
    body
  finally:
    setCurrentDir(old)

let origDir = getCurrentDir()
setCurrentDir(getAppDir())

proc tryExec(cmd: string): bool =
  echo(cmd)
  result = execShellCmd(cmd) == 0

proc safeRemove(filename: string) =
  if existsFile(filename): removeFile(filename)

proc overwriteFile(source, dest: string) =
  safeRemove(dest)
  moveFile(source, dest)

proc copyExe(source, dest: string) =
  safeRemove(dest)
  copyFile(dest=dest, source=source)
  inclFilePermissions(dest, {fpUserExec, fpGroupExec, fpOthersExec})

const
  compileNimInst = "tools/niminst/niminst"
  distDir = "dist"

proc csource(args: string) =
  nimexec(("cc $1 -r $3 --var:version=$2 --var:mingw=none csource " &
           "--main:compiler/nim.nim compiler/installer.ini $1") %
       [args, VersionAsString, compileNimInst])

proc bundleC2nim(args: string) =
  cloneDependency(distDir, "https://github.com/nim-lang/c2nim.git")
  nimCompile("dist/c2nim/c2nim",
             options = "--noNimblePath --path:. " & args)

proc bundleNimbleExe(latest: bool, args: string) =
  let commit = if latest: "HEAD" else: NimbleStableCommit
  cloneDependency(distDir, "https://github.com/nim-lang/nimble.git", commit = commit)
  # installer.ini expects it under $nim/bin
  nimCompile("dist/nimble/src/nimble.nim",
             options = "-d:release --nilseqs:on " & args)

proc buildNimble(latest: bool, args: string) =
  # if koch is used for a tar.xz, build the dist/nimble we shipped
  # with the tarball:
  var installDir = "dist/nimble"
  if not latest and dirExists(installDir) and not dirExists("dist/nimble/.git"):
    discard "don't do the git dance"
  else:
    if not dirExists("dist/nimble/.git"):
      if dirExists(installDir):
        var id = 0
        while dirExists("dist/nimble" & $id):
          inc id
        installDir = "dist/nimble" & $id
      # consider using/adapting cloneDependency
      exec("git clone -q https://github.com/nim-lang/nimble.git " & installDir)
    withDir(installDir):
      if latest:
        exec("git checkout -f master")
        exec("git pull")
      else:
        exec("git fetch")
        exec("git checkout " & NimbleStableCommit)
  nimCompile(installDir / "src/nimble.nim",
             options = "--noNimblePath --nilseqs:on -d:release " & args)

proc bundleNimsuggest(args: string) =
  nimCompileFold("Compile nimsuggest", "nimsuggest/nimsuggest.nim",
                 options = "-d:release -d:danger " & args)

proc buildVccTool(args: string) =
  nimCompileFold("Compile Vcc", "tools/vccexe/vccexe.nim ", options = args)

proc bundleNimpretty(args: string) =
  nimCompileFold("Compile nimpretty", "nimpretty/nimpretty.nim",
                 options = "-d:release " & args)

proc bundleWinTools(args: string) =
  nimCompile("tools/finish.nim", outputDir = "", options = args)

  buildVccTool(args)
  nimCompile("tools/nimgrab.nim", options = "-d:ssl " & args)
  nimCompile("tools/nimgrep.nim", options = args)
  bundleC2nim(args)
  nimCompile("testament/testament.nim", options = args)
  when false:
    # not yet a tool worth including
    nimCompile(r"tools\downloader.nim",
               options = r"--cc:vcc --app:gui -d:ssl --noNimblePath --path:..\ui " & args)

proc zip(latest: bool; args: string) =
  bundleNimbleExe(latest, args)
  bundleNimsuggest(args)
  bundleNimpretty(args)
  bundleWinTools(args)
  nimexec("cc -r $2 --var:version=$1 --var:mingw=none --main:compiler/nim.nim scripts compiler/installer.ini" %
       [VersionAsString, compileNimInst])
  exec("$# --var:version=$# --var:mingw=none --main:compiler/nim.nim zip compiler/installer.ini" %
       ["tools/niminst/niminst".exe, VersionAsString])

proc ensureCleanGit() =
  let (outp, status) = osproc.execCmdEx("git diff")
  if outp.len != 0:
    quit "Not a clean git repository; 'git diff' not empty!"
  if status != 0:
    quit "Not a clean git repository; 'git diff' returned non-zero!"

proc xz(latest: bool; args: string) =
  ensureCleanGit()
  nimexec("cc -r $2 --var:version=$1 --var:mingw=none --main:compiler/nim.nim scripts compiler/installer.ini" %
       [VersionAsString, compileNimInst])
  exec("$# --var:version=$# --var:mingw=none --main:compiler/nim.nim xz compiler/installer.ini" %
       ["tools" / "niminst" / "niminst".exe, VersionAsString])

proc buildTool(toolname, args: string) =
  nimexec("cc $# $#" % [args, toolname])
  copyFile(dest="bin" / splitFile(toolname).name.exe, source=toolname.exe)

proc buildTools(args: string = "") =
  bundleNimsuggest(args)
  nimCompileFold("Compile nimgrep", "tools/nimgrep.nim",
                 options = "-d:release " & args)
  when defined(windows): buildVccTool(args)
  bundleNimpretty(args)
  nimCompileFold("Compile nimfind", "tools/nimfind.nim",
                 options = "-d:release " & args)
  nimCompileFold("Compile testament", "testament/testament.nim",
                 options = "-d:release " & args)

proc nsis(latest: bool; args: string) =
  bundleNimbleExe(latest, args)
  bundleNimsuggest(args)
  bundleWinTools(args)
  # make sure we have generated the niminst executables:
  buildTool("tools/niminst/niminst", args)
  #buildTool("tools/nimgrep", args)
  # produce 'nim_debug.exe':
  #exec "nim c compiler" / "nim.nim"
  #copyExe("compiler/nim".exe, "bin/nim_debug".exe)
  exec(("tools" / "niminst" / "niminst --var:version=$# --var:mingw=mingw$#" &
        " nsis compiler/installer.ini") % [VersionAsString, $(sizeof(pointer)*8)])

proc geninstall(args="") =
  nimexec("cc -r $# --var:version=$# --var:mingw=none --main:compiler/nim.nim scripts compiler/installer.ini $#" %
       [compileNimInst, VersionAsString, args])

proc install(args: string) =
  geninstall()
  exec("sh ./install.sh $#" % args)

when false:
  proc web(args: string) =
    nimexec("js tools/dochack/dochack.nim")
    nimexec("cc -r tools/nimweb.nim $# web/website.ini --putenv:nimversion=$#" %
        [args, VersionAsString])

  proc website(args: string) =
    nimexec("cc -r tools/nimweb.nim $# --website web/website.ini --putenv:nimversion=$#" %
        [args, VersionAsString])

  proc pdf(args="") =
    exec("$# cc -r tools/nimweb.nim $# --pdf web/website.ini --putenv:nimversion=$#" %
        [findNim().quoteShell(), args, VersionAsString], additionalPATH=findNim().splitFile.dir)

# -------------- boot ---------------------------------------------------------

proc findStartNim: string =
  # we try several things before giving up:
  # * nimExe
  # * bin/nim
  # * $PATH/nim
  # If these fail, we try to build nim with the "build.(sh|bat)" script.
  let (nim, ok) = findNimImpl()
  if ok: return nim
  when defined(Posix):
    const buildScript = "build.sh"
    if existsFile(buildScript):
      if tryExec("./" & buildScript): return "bin" / nim
  else:
    const buildScript = "build.bat"
    if existsFile(buildScript):
      if tryExec(buildScript): return "bin" / nim

  echo("Found no nim compiler and every attempt to build one failed!")
  quit("FAILURE")

proc thVersion(i: int): string =
  result = ("compiler" / "nim" & $i).exe

template doUseCpp(): bool = getEnv("NIM_COMPILE_TO_CPP", "false") == "true"

proc boot(args: string) =
  var output = "compiler" / "nim".exe
  var finalDest = "bin" / "nim".exe
  # default to use the 'c' command:
  let useCpp = doUseCpp()
  let smartNimcache = (if "release" in args or "danger" in args: "nimcache/r_" else: "nimcache/d_") &
                      hostOS & "_" & hostCPU

  let nimStart = findStartNim().quoteShell()
  for i in 0..2:
    # Nim versions < (1, 1) expect Nim's exception type to have a 'raiseId' field for
    # C++ interop. Later Nim versions do this differently and removed the 'raiseId' field.
    # Thus we always bootstrap the first iteration with "c" and not with "cpp" as
    # a workaround.
    let defaultCommand = if useCpp and i > 0: "cpp" else: "c"
    let bootOptions = if args.len == 0 or args.startsWith("-"): defaultCommand else: ""
    echo "iteration: ", i+1
    var extraOption = ""
    var nimi = i.thVersion
    if i == 0:
      nimi = nimStart
      extraOption.add " --skipUserCfg --skipParentCfg"
        # The configs are skipped for bootstrap
        # (1st iteration) to prevent newer flags from breaking bootstrap phase.
      let ret = execCmdEx(nimStart & " --version")
      doAssert ret.exitCode == 0
      let version = ret.output.splitLines[0]
      # remove these when csources get updated
      template addLib() =
        extraOption.add " --lib:lib" # see https://github.com/nim-lang/Nim/pull/14291
      if version.startsWith "Nim Compiler Version 0.19.0":
        extraOption.add " -d:nimBoostrapCsources0_19_0"
        addLib()
      elif version.startsWith "Nim Compiler Version 0.20.0": addLib()

    # in order to use less memory, we split the build into two steps:
    # --compileOnly produces a $project.json file and does not run GCC/Clang.
    # jsonbuild then uses the $project.json file to build the Nim binary.
    exec "$# $# $# --nimcache:$# $# --compileOnly compiler" / "nim.nim" %
      [nimi, bootOptions, extraOption, smartNimcache, args]
    exec "$# jsonscript --nimcache:$# $# compiler" / "nim.nim" %
      [nimi, smartNimcache, args]

    if sameFileContent(output, i.thVersion):
      copyExe(output, finalDest)
      echo "executables are equal: SUCCESS!"
      return
    copyExe(output, (i+1).thVersion)
  copyExe(output, finalDest)
  when not defined(windows): echo "[Warning] executables are still not equal"

# -------------- clean --------------------------------------------------------

const
  cleanExt = [
    ".ppu", ".o", ".obj", ".dcu", ".~pas", ".~inc", ".~dsk", ".~dpr",
    ".map", ".tds", ".err", ".bak", ".pyc", ".exe", ".rod", ".pdb", ".idb",
    ".idx", ".ilk"
  ]
  ignore = [
    ".bzrignore", "nim", "nim.exe", "koch", "koch.exe", ".gitignore"
  ]

proc cleanAux(dir: string) =
  for kind, path in walkDir(dir):
    case kind
    of pcFile:
      var (_, name, ext) = splitFile(path)
      if ext == "" or cleanExt.contains(ext):
        if not ignore.contains(name):
          echo "removing: ", path
          removeFile(path)
    of pcDir:
      case splitPath(path).tail
      of "nimcache":
        echo "removing dir: ", path
        removeDir(path)
      of "dist", ".git", "icons": discard
      else: cleanAux(path)
    else: discard

proc removePattern(pattern: string) =
  for f in walkFiles(pattern):
    echo "removing: ", f
    removeFile(f)

proc clean(args: string) =
  removePattern("web/*.html")
  removePattern("doc/*.html")
  cleanAux(getCurrentDir())
  for kind, path in walkDir(getCurrentDir() / "build"):
    if kind == pcDir:
      echo "removing dir: ", path
      removeDir(path)

# -------------- builds a release ---------------------------------------------

proc winReleaseArch(arch: string) =
  doAssert arch in ["32", "64"]
  let cpu = if arch == "32": "i386" else: "amd64"

  template withMingw(path, body) =
    let prevPath = getEnv("PATH")
    putEnv("PATH", (if path.len > 0: path & PathSep else: "") & prevPath)
    try:
      body
    finally:
      putEnv("PATH", prevPath)

  withMingw r"..\mingw" & arch & r"\bin":
    # Rebuilding koch is necessary because it uses its pointer size to
    # determine which mingw link to put in the NSIS installer.
    inFold "winrelease koch":
      nimexec "c --cpu:$# koch" % cpu
    kochExecFold("winrelease boot", "boot -d:release --cpu:$#" % cpu)
    kochExecFold("winrelease zip", "zip -d:release")
    overwriteFile r"build\nim-$#.zip" % VersionAsString,
             r"web\upload\download\nim-$#_x$#.zip" % [VersionAsString, arch]

proc winRelease*() =
  # Now used from "tools/winrelease" and not directly supported by koch
  # anymore!
  # Build -docs file:
  when true:
    inFold "winrelease buildDocs":
      buildDocs(gaCode)
    withDir "web/upload/" & VersionAsString:
      inFold "winrelease zipdocs":
        exec "7z a -tzip docs-$#.zip *.html" % VersionAsString
    overwriteFile "web/upload/$1/docs-$1.zip" % VersionAsString,
                  "web/upload/download/docs-$1.zip" % VersionAsString
  when true:
    inFold "winrelease csource":
      csource("-d:release")
  when sizeof(pointer) == 4:
    winReleaseArch "32"
  when sizeof(pointer) == 8:
    winReleaseArch "64"

# -------------- tests --------------------------------------------------------

template `|`(a, b): string = (if a.len > 0: a else: b)

proc tests(args: string) =
  nimexec "cc --opt:speed testament/testament"
  let tester = quoteShell(getCurrentDir() / "testament/testament".exe)
  let success = tryExec tester & " " & (args|"all")
  if not success:
    quit("tests failed", QuitFailure)

proc temp(args: string) =
  proc splitArgs(a: string): (string, string) =
    # every --options before the command (indicated by starting
    # with not a dash) is part of the bootArgs, the rest is part
    # of the programArgs:
    let args = os.parseCmdLine a
    result = ("", "")
    var i = 0
    while i < args.len and args[i][0] == '-':
      result[0].add " " & quoteShell(args[i])
      inc i
    while i < args.len:
      result[1].add " " & quoteShell(args[i])
      inc i

  let d = getAppDir()
  var output = d / "compiler" / "nim".exe
  var finalDest = d / "bin" / "nim_temp".exe
  # 125 is the magic number to tell git bisect to skip the current commit.
  var (bootArgs, programArgs) = splitArgs(args)
  if "doc" notin programArgs and
      "threads" notin programArgs and
      "js" notin programArgs:
    bootArgs.add " -d:leanCompiler"
  let nimexec = findNim().quoteShell()
  exec(nimexec & " c -d:debug --debugger:native -d:nimBetterRun " & bootArgs & " " & (d / "compiler" / "nim"), 125)
  copyExe(output, finalDest)
  setCurrentDir(origDir)
  if programArgs.len > 0: exec(finalDest & " " & programArgs)

proc xtemp(cmd: string) =
  let d = getAppDir()
  copyExe(d / "bin" / "nim".exe, d / "bin" / "nim_backup".exe)
  try:
    withDir(d):
      temp""
    copyExe(d / "bin" / "nim_temp".exe, d / "bin" / "nim".exe)
    exec(cmd)
  finally:
    copyExe(d / "bin" / "nim_backup".exe, d / "bin" / "nim".exe)

proc buildDrNim(args: string) =
  if not dirExists("dist/nimz3"):
    exec("git clone https://github.com/zevv/nimz3.git dist/nimz3")
  when defined(windows):
    if not dirExists("dist/dlls"):
      exec("git clone -q https://github.com/nim-lang/dlls.git dist/dlls")
    copyExe("dist/dlls/libz3.dll", "bin/libz3.dll")
    execFold("build drnim", "nim c -o:$1 $2 drnim/drnim" % ["bin/drnim".exe, args])
  else:
    if not dirExists("dist/z3"):
      exec("git clone -q https://github.com/Z3Prover/z3.git dist/z3")
      withDir("dist/z3"):
        exec("git fetch")
        exec("git checkout " & Z3StableCommit)
        createDir("build")
        withDir("build"):
          exec("""cmake -DZ3_BUILD_LIBZ3_SHARED=FALSE -G "Unix Makefiles" ../""")
          exec("make -j4")
    execFold("build drnim", "nim cpp --dynlibOverride=libz3 -o:$1 $2 drnim/drnim" % ["bin/drnim".exe, args])
  # always run the tests for now:
  exec("testament/testament".exe & " --nim:" & "drnim".exe & " pat drnim/tests")


proc hostInfo(): string =
  "hostOS: $1, hostCPU: $2, int: $3, float: $4, cpuEndian: $5, cwd: $6" %
    [hostOS, hostCPU, $int.sizeof, $float.sizeof, $cpuEndian, getCurrentDir()]

proc installDeps(dep: string, commit = "") =
  # the hashes/urls are version controlled here, so can be changed seamlessly
  # and tied to a nim release (mimicking git submodules)
  var commit = commit
  case dep
  of "tinyc":
    if commit.len == 0: commit = "916cc2f94818a8a382dd8d4b8420978816c1dfb3"
    cloneDependency(distDir, "https://github.com/timotheecour/nim-tinyc-archive", commit)
  else: doAssert false, "unsupported: " & dep
  # xxx: also add linenoise, niminst etc, refs https://github.com/nim-lang/RFCs/issues/206

proc runCI(cmd: string) =
  doAssert cmd.len == 0, cmd # avoid silently ignoring
  echo "runCI: ", cmd
  echo hostInfo()
  # boot without -d:nimHasLibFFI to make sure this still works
  kochExecFold("Boot in release mode", "boot -d:release")

  ## build nimble early on to enable remainder to depend on it if needed
  kochExecFold("Build Nimble", "nimble")

  if getEnv("NIM_TEST_PACKAGES", "0") == "1":
    execFold("Test selected Nimble packages (1)", "nim c -r testament/testament cat nimble-packages-1")
  elif getEnv("NIM_TEST_PACKAGES", "0") == "2":
    execFold("Test selected Nimble packages (2)", "nim c -r testament/testament cat nimble-packages-2")
  else:
    buildTools()

    ## run tests
    execFold("Test nimscript", "nim e tests/test_nimscript.nims")
    when defined(windows):
      # note: will be over-written below
      execFold("Compile tester", "nim c -d:nimCoroutines --os:genode -d:posix --compileOnly testament/testament")

    # main bottleneck here
    execFold("Run tester", "nim c -r -d:nimCoroutines testament/testament --pedantic all -d:nimCoroutines")
    block CT_FFI:
      when defined(posix): # windows can be handled in future PR's
        execFold("nimble install -y libffi", "nimble install -y libffi")
        const nimFFI = "./bin/nim.ctffi"
        # no need to bootstrap with koch boot (would be slower)
        let backend = if doUseCpp(): "cpp" else: "c"
        execFold("build with -d:nimHasLibFFI", "nim $1 -d:release -d:nimHasLibFFI -o:$2 compiler/nim.nim" % [backend, nimFFI])
        execFold("test with -d:nimHasLibFFI", "$1 $2 -r testament/testament --nim:$1 r tests/misc/trunner.nim -d:nimTrunnerFfi" % [nimFFI, backend])

    execFold("Run nimdoc tests", "nim c -r nimdoc/tester")
    execFold("Run nimpretty tests", "nim c -r nimpretty/tester.nim")
    when defined(posix):
      execFold("Run nimsuggest tests", "nim c -r nimsuggest/tester")

proc pushCsources() =
  if not dirExists("../csources/.git"):
    quit "[Error] no csources git repository found"
  csource("-d:release")
  let cwd = getCurrentDir()
  try:
    copyDir("build/c_code", "../csources/c_code")
    copyFile("build/build.sh", "../csources/build.sh")
    copyFile("build/build.bat", "../csources/build.bat")
    copyFile("build/build64.bat", "../csources/build64.bat")
    copyFile("build/makefile", "../csources/makefile")

    setCurrentDir("../csources")
    for kind, path in walkDir("c_code"):
      if kind == pcDir:
        exec("git add " & path / "*.c")
    exec("git commit -am \"updated csources to version " & NimVersion & "\"")
    exec("git push origin master")
    exec("git tag -am \"Version $1\" v$1" % NimVersion)
    exec("git push origin v$1" % NimVersion)
  finally:
    setCurrentDir(cwd)

proc testUnixInstall(cmdLineRest: string) =
  csource("-d:release " & cmdLineRest)
  xz(false, cmdLineRest)
  let oldCurrentDir = getCurrentDir()
  try:
    let destDir = getTempDir()
    copyFile("build/nim-$1.tar.xz" % VersionAsString,
             destDir / "nim-$1.tar.xz" % VersionAsString)
    setCurrentDir(destDir)
    execCleanPath("tar -xJf nim-$1.tar.xz" % VersionAsString)
    setCurrentDir("nim-$1" % VersionAsString)
    execCleanPath("sh build.sh")
    # first test: try if './bin/nim --version' outputs something sane:
    let output = execProcess("./bin/nim --version").splitLines
    if output.len > 0 and output[0].contains(VersionAsString):
      echo "Version check: success"
      execCleanPath("./bin/nim c koch.nim")
      execCleanPath("./koch boot -d:release", destDir / "bin")
      # check the docs build:
      execCleanPath("./koch docs", destDir / "bin")
      # check nimble builds:
      execCleanPath("./koch tools")
      # check the tests work:
      putEnv("NIM_EXE_NOT_IN_PATH", "NOT_IN_PATH")
      execCleanPath("./koch tests --nim:./bin/nim cat megatest", destDir / "bin")
    else:
      echo "Version check: failure"
  finally:
    setCurrentDir oldCurrentDir

proc valgrind(cmd: string) =
  # somewhat hacky: '=' sign means "pass to valgrind" else "pass to Nim"
  let args = parseCmdLine(cmd)
  var nimcmd = ""
  var valcmd = ""
  for i, a in args:
    if i == args.len-1:
      # last element is the filename:
      valcmd.add ' '
      valcmd.add changeFileExt(a, ExeExt)
      nimcmd.add ' '
      nimcmd.add a
    elif '=' in a:
      valcmd.add ' '
      valcmd.add a
    else:
      nimcmd.add ' '
      nimcmd.add a
  exec("nim c" & nimcmd)
  let supp = getAppDir() / "tools" / "nimgrind.supp"
  exec("valgrind --suppressions=" & supp & valcmd)

proc showHelp() =
  quit(HelpText % [VersionAsString & spaces(44-len(VersionAsString)),
                   CompileDate, CompileTime], QuitSuccess)

when isMainModule:
  var op = initOptParser()
  var latest = false
  while true:
    op.next()
    case op.kind
    of cmdLongOption, cmdShortOption:
      case normalize(op.key)
      of "latest": latest = true
      of "stable": latest = false
      of "nim": nimExe = op.val.absolutePath # absolute so still works with changeDir
      of "docslocal":
        # undocumented for now, allows to rebuild local docs in < 40s as follows:
        # `./koch --nim:$nimb --docslocal:htmldocs2 --doccmd:skip --warnings:off --hints:off`
        # whereas `./koch docs` takes 190s; useful for development.
        doAssert op.val.len > 0
        buildDocsDir(op.cmdLineRest, op.val)
        break
      else: showHelp()
    of cmdArgument:
      case normalize(op.key)
      of "boot": boot(op.cmdLineRest)
      of "clean": clean(op.cmdLineRest)
      of "doc", "docs": buildDocs(op.cmdLineRest)
      of "doc0", "docs0":
        # undocumented command for Araq-the-merciful:
        buildDocs(op.cmdLineRest & gaCode)
      of "pdf": buildPdfDoc(op.cmdLineRest, "doc/pdf")
      of "csource", "csources": csource(op.cmdLineRest)
      of "zip": zip(latest, op.cmdLineRest)
      of "xz": xz(latest, op.cmdLineRest)
      of "nsis": nsis(latest, op.cmdLineRest)
      of "geninstall": geninstall(op.cmdLineRest)
      of "distrohelper": geninstall()
      of "install": install(op.cmdLineRest)
      of "testinstall": testUnixInstall(op.cmdLineRest)
      of "installdeps": installDeps(op.cmdLineRest)
      of "runci": runCI(op.cmdLineRest)
      of "test", "tests": tests(op.cmdLineRest)
      of "temp": temp(op.cmdLineRest)
      of "xtemp": xtemp(op.cmdLineRest)
      of "wintools": bundleWinTools(op.cmdLineRest)
      of "nimble": buildNimble(latest, op.cmdLineRest)
      of "nimsuggest": bundleNimsuggest(op.cmdLineRest)
      of "toolsnonimble":
        buildTools(op.cmdLineRest)
      of "tools":
        buildTools(op.cmdLineRest)
        buildNimble(latest, op.cmdLineRest)
      of "pushcsource", "pushcsources": pushCsources()
      of "valgrind": valgrind(op.cmdLineRest)
      of "c2nim": bundleC2nim(op.cmdLineRest)
      of "drnim": buildDrNim(op.cmdLineRest)
      else: showHelp()
      break
    of cmdEnd: break