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import lapp, tables
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from os import paramStr, paramCount
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# This is a trivial example trying to cover all features of lapp.
let help = """
example [options] command filenames
-r Just an optional single character flag. Show the args using repr.
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-t,--test Or with additional long variant, no whitespace there.
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-n: A colon can be added, but has no meaning, instead () specifies further.
-N (default 10) And it can take a value, and have a default value.
-f (default 0.04) And be a float
-s (default banana) Or a string
-x (int) And it can be typed with int, string, float, stdin, stdout - without a
default value. This implies that the option is mandatory!
-X (int...) And allow multiples.
-v,--verbose: (bool...) Verbosity level, "..." means can be multiple.
-o,--out (default stdout) A file to direct to.
<command> Arguments are string by default.
<file>: (default stdin...) One or more files or stdin by default
The first line in this help text is arbitrary, or rather
its only the lines (trimmed) beginning with '-' or '<' that constitute
the speciciation, so this text is also ignored.
Things we know are not working:
ranges. The lexer in lapp does it, but there is no more support.
"""
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# This part is for build testing lapp, we run a bunch of asserts
if paramCount() == 1 and paramStr(1) == "test":
var args = parseArguments(help, @["example", "-x1", "-X4", "cmd"])
assert(args["r"].asBool == false)
assert(args["test"].asBool == false)
assert(args["n"].asBool == false)
assert(args["N"].asInt == 10)
assert(args["f"].asFloat == 0.04)
assert(args["s"].asString == "banana")
assert(args["x"].asInt == 1)
assert(args["X"].asSeq[0].asInt == 4)
assert(args["verbose"].asSeq.len == 1)
assert(args["verbose"].asSeq[0].asBool == false)
assert(args["out"].filename == "stdout")
assert(args["command"].asString == "cmd")
assert(args["file"].asSeq.len == 1)
assert(args["file"].asSeq[0].filename == "stdin")
else:
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# We call `parse` in lapp with our help text as argument.
# This will both parse the help text above and then, parse the
# arguments passed to this program. A table is returned
# with all command line elements in it, keyed by their name
# and with a PValue as value.
var args = parse(help)
# Let's examine what we got using repr
echo "A bit messy, but shows exactly what we got:\n\n"
for k,v in args:
echo "Parameter: " & k & " PValue: " & repr(v)
# Or print out a bit cleaner
echo "Parameters and their values more readable:"
echo "r == " & $args["r"].asBool
echo "test == " & $args["test"].asBool # Long name is used as key, if its specified
echo "n == " & $args["n"].asBool
echo "N == " & $args["N"].asInt
echo "f == " & $args["f"].asFloat
echo "s == " & $args["s"].asString
echo "x == " & $args["x"].asInt
echo "X == " & $args["X"].asSeq.map(proc(x:PValue):int = x.asInt)
echo "verbose == " & $args["verbose"].asSeq.len
echo "out == " & $args["out"].filename
echo "command == " & $args["command"].asString
echo "file == " & $args["file"].asSeq.map(proc(x:PValue):string = x.filename)
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