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import
future, options, os, posix, sequtils, sets, strutils,
utils
type
ArgumentType* {.pure.} = enum
short, long, target
Argument* = tuple[
key: string,
value: Option[string],
atype: ArgumentType
]
OptionPair* = tuple[
short: Option[string],
long: string
]
OptionKey* = tuple[
key: string,
long: bool
]
iterator readLines(): string =
try:
while true:
yield readLine(stdin)
except:
discard
iterator splitSingle(valueFull: string, optionsWithParameter: HashSet[OptionKey],
next: Option[string]): tuple[key: string, value: Option[string], consumedNext: bool] =
var i = 0
while i < valueFull.len:
let key = $valueFull[i]
if (key, false) in optionsWithParameter:
if i == valueFull.high:
if next.isNone:
raise commandError(trc("%s: option requires an argument -- '%c'\n").strip
.replace("%s", "$#").replace("%c", "$#") % [getAppFilename(), key],
showError = false)
else:
yield (key, next, true)
else:
yield (key, some(valueFull[i + 1 .. ^1]), false)
i = valueFull.len
else:
yield (key, none(string), false)
i += 1
proc splitArgs*(params: seq[string],
optionsWithParameter: HashSet[OptionKey]): seq[Argument] =
proc handleCurrentNext(current: string, next: Option[string],
stdinConsumed: bool, endOfOpts: bool): (seq[Argument], Option[string], bool, bool) =
if current == "-":
if stdinConsumed or isatty(0) == 1:
raise commandError(trp("argument '-' specified without input on stdin\n").strip)
else:
let args = lc[x | (y <- readLines(), x <- y.splitWhitespace), string]
.map(s => (s, none(string), ArgumentType.target))
return (args, next, true, endOfOpts)
elif endOfOpts:
return (@[(current, none(string), ArgumentType.target)], next, stdinConsumed, true)
elif current == "--":
return (@[], next, stdinConsumed, true)
elif current[0 .. 1] == "--":
let valueFull = current[2 .. ^1]
let index = valueFull.find("=")
let key = if index >= 0: valueFull[0 .. index - 1] else: valueFull
let valueOption = if index >= 0: some(valueFull[index + 1 .. ^1]) else: none(string)
if (key, true) in optionsWithParameter:
if valueOption.isSome:
return (@[(key, valueOption, ArgumentType.long)], next, stdinConsumed, false)
elif next.isSome:
return (@[(key, next, ArgumentType.long)], none(string), stdinConsumed, false)
else:
raise commandError(trc("%s: option '%s%s' requires an argument\n").strip
.replace("%s", "$#") % [getAppFilename(), "--", key], showError = false)
elif valueOption.isSome:
raise commandError(trc("%s: option '%s%s' doesn't allow an argument\n").strip
.replace("%s", "$#") % [getAppFilename(), "--", key], showError = false)
else:
return (@[(key, none(string), ArgumentType.long)], next, stdinConsumed, false)
elif current[0] == '-' and current.len >= 2:
let argsResult = toSeq(splitSingle(current[1 .. ^1], optionsWithParameter, next))
let consumedNext = argsResult.map(a => a.consumedNext).foldl(a or b)
let newNext = next.filter(n => not consumedNext)
return (lc[(x.key, x.value, ArgumentType.short) | (x <- argsResult), Argument],
newNext, stdinConsumed, false)
else:
return (@[(current, none(string), ArgumentType.target)], next, stdinConsumed, false)
type
ParseArgument = tuple[arg: Option[Argument],current: Option[string]]
ParseCycle = tuple[args: seq[ParseArgument], stdinConsumed: bool, endOfOpts: bool]
proc buildArgs(input: ParseCycle, next: Option[string]): ParseCycle =
if input.args.len == 0:
(@[(none(Argument), next)], input.stdinConsumed, input.endOfOpts)
else:
let last = input.args[^1]
if last.current.isSome:
let handleResult: tuple[args: seq[Argument], next: Option[string],
stdinConsumed: bool, endOfOpts: bool] = handleCurrentNext(last.current.unsafeGet,
next, input.stdinConsumed, input.endOfOpts)
let append = handleResult.args.map(a => (some(a), none(string)))
(input.args[0 .. ^2] & append & (none(Argument), handleResult.next),
handleResult.stdinConsumed, handleResult.endOfOpts)
elif next.isSome:
(input.args & (none(Argument), next), input.stdinConsumed, input.endOfOpts)
else:
input
let cycle: ParseCycle = (params.map(some) & none(string))
.foldl(buildArgs(a, b), (newSeq[ParseArgument](), false, false))
if cycle.stdinConsumed:
discard close(0)
discard open("/dev/tty", O_RDONLY)
lc[x | (y <- cycle.args, x <- y.arg), Argument]
proc isShort*(arg: Argument): bool = arg.atype == ArgumentType.short
proc isLong*(arg: Argument): bool = arg.atype == ArgumentType.long
proc isTarget*(arg: Argument): bool = arg.atype == ArgumentType.target
proc collectArg*(arg: Argument): seq[string] =
if arg.isShort:
let key = "-" & arg.key
arg.value.map(v => @[key, v]).get(@[key])
elif arg.isLong:
let key = "--" & arg.key
arg.value.map(v => @[key, v]).get(@[key])
elif arg.isTarget:
@[arg.key]
else:
@[]
proc len*(op: OptionPair): int =
if op.short.isSome: 2 else: 1
iterator items*(op: OptionPair): OptionKey =
if op.short.isSome:
yield (op.short.unsafeGet, false)
yield (op.long, true)
proc filter*(args: seq[Argument], removeMatches: bool, keepTargets: bool,
pairs: varargs[OptionPair]): seq[Argument] =
let pairsSeq = @pairs
let argsSet = lc[x | (y <- pairsSeq, x <- y), OptionKey].toSet
args.filter(arg => (arg.isShort and (removeMatches xor (arg.key, false) in argsSet)) or
(arg.isLong and (removeMatches xor (arg.key, true) in argsSet)) or
(arg.isTarget and keepTargets))
template count*(args: seq[Argument], pairs: varargs[OptionPair]): int =
args.filter(false, false, pairs).len
template check*(args: seq[Argument], pairs: varargs[OptionPair]): bool =
args.count(pairs) > 0
template whitelisted*(args: seq[Argument], pairs: varargs[OptionPair]): bool =
args.filter(true, false, pairs).len == 0
proc matchOption*(arg: Argument, pair: OptionPair): bool =
(arg.isShort and pair.short.map(o => o == arg.key).get(false)) or
(arg.isLong and arg.key == pair.long)
proc targets*(args: seq[Argument]): seq[string] =
args.filter(isTarget).map(a => a.key)
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