smartcli.nim

import std / [parseopt, strutils, syncio]
export parseopt

proc writeSpec(spec: string) =
  stdout.write spec
  if not spec.endsWith('\n'):
    stdout.write '\n'
  stdout.flushFile()

proc cliExitHelp*(spec: string) {.noreturn.} =
  writeSpec(spec)
  quit 0

proc cliExitVersion*(spec: string) {.noreturn.} =
  var title = ""
  var i = 0
  while i < spec.len and spec[i] notin {'\n', '\r'}:
    title.add spec[i]
    inc i
  title = title.strip()
  if title.len == 0:
    title = spec.strip()
  stdout.write title
  stdout.write '\n'
  stdout.flushFile()
  quit 0

proc cliFail*(spec, message: string) {.noreturn.} =
  stdout.write "[Error] "
  stdout.write message
  stdout.write '\n'
  writeSpec(spec)
  quit 1

proc cliUnknownLongOption*(spec, key: string) {.noreturn.} =
  cliFail(spec, "unknown option: --" & key)

proc cliUnknownShortOption*(spec, key: string) {.noreturn.} =
  cliFail(spec, "unknown option: -" & key)

proc cliUnexpectedArgument*(spec, arg: string) {.noreturn.} =
  cliFail(spec, "unexpected argument: " & arg)

proc cliMissingArguments*(spec: string) {.noreturn.} =
  cliFail(spec, "missing arguments")

proc cliInvalidValue*(spec, optionName, value: string) {.noreturn.} =
  cliFail(spec, "invalid value for " & optionName & ": " & value)

template cliapp*(spec: string): untyped {.plugin: "smartcliplugin".}