hy/hy/cmdline.py

# Copyright (c) 2013 Paul Tagliamonte <paultag@debian.org>
# Copyright (c) 2013 Will Kahn-Greene <willg@bluesock.org>
#
# Permission is hereby granted, free of charge, to any person obtaining a
# copy of this software and associated documentation files (the "Software"),
# to deal in the Software without restriction, including without limitation
# the rights to use, copy, modify, merge, publish, distribute, sublicense,
# and/or sell copies of the Software, and to permit persons to whom the
# Software is furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
# THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
# DEALINGS IN THE SOFTWARE.

import ast
import code
import optparse
import os
import readline
import sys

import hy

from hy.lex.states import Idle, LexException
from hy.lex.machine import Machine
from hy.compiler import hy_compile
from hy.core import process
from hy.importer import ast_compile

import hy.completer

from hy.macros import macro
from hy.models.expression import HyExpression
from hy.models.string import HyString
from hy.models.symbol import HySymbol


_machine = Machine(Idle, 1, 0)


class HyREPL(code.InteractiveConsole):
    def runsource(self, source, filename='<input>', symbol='single'):
        global _machine

        try:
            _machine.process(source + "\n")
        except LexException:
            _machine = Machine(Idle, 1, 0)
            self.showsyntaxerror(filename)
            return False

        if type(_machine.state) != Idle:
            _machine = Machine(Idle, 1, 0)
            return True

        try:
            tokens = process(_machine.nodes)
        except Exception:
            _machine = Machine(Idle, 1, 0)
            self.showtraceback()
            return False

        _machine = Machine(Idle, 1, 0)
        try:
            _ast = hy_compile(tokens, root=ast.Interactive)
            code = ast_compile(_ast, filename, symbol)
        except Exception:
            self.showtraceback()
            return False

        self.runcode(code)
        return False


@macro("koan")
def koan_macro(tree):
    return HyExpression([HySymbol('print'),
                         HyString("""
  Ummon asked the head monk, "What sutra are you lecturing on?"
  "The Nirvana Sutra."
  "The Nirvana Sutra has the Four Virtues, hasn't it?"
  "It has."
  Ummon asked, picking up a cup, "How many virtues has this?"
  "None at all, " said the monk.
  "But ancient people said it had, didn't they?" said Ummon.
  "Whatdo you think of what they said?"
  Ummon struck the cup and asked, "You understand?"
  "No," said the monk.
  "Then," said Ummon, "You'd better go on with your lectures on the sutra."
""")])


@macro("ideas")
def ideas_macro(tree):
    return HyExpression([HySymbol('print'),
                         HyString("""

    => (import [sh [figlet]])
    => (figlet "Hi, Hy!")
     _   _ _     _   _       _
    | | | (_)   | | | |_   _| |
    | |_| | |   | |_| | | | | |
    |  _  | |_  |  _  | |_| |_|
    |_| |_|_( ) |_| |_|\__, (_)
            |/         |___/


;;; string things
(.join ", " ["what" "the" "heck"])


;;; this one plays with command line bits
(import [sh [cat grep]])
(-> (cat "/usr/share/dict/words") (grep "-E" "bro$"))


;;; filtering a list w/ a lambda
(filter (lambda [x] (= (% x 2) 0)) (range 0 10))


;;; swaggin' functional bits (Python rulez)
(max (map (lambda [x] (len x)) ["hi" "my" "name" "is" "paul"]))

""")])


def run_command(source):
    hr = HyREPL()
    hr.runsource(source, filename='<input>', symbol='single')
    return 0


def run_file(filename):
    from hy.importer import import_file_to_module
    import_file_to_module("__main__", filename)
    return 0  # right?


def run_repl(hr=None):
    sys.ps1 = "=> "
    sys.ps2 = "... "

    history = os.path.expanduser("~/.hy-history")
    readline.parse_and_bind("set blink-matching-paren on")

    try:
        readline.read_history_file(history)
    except IOError:
        open(history, 'a').close()

    readline.parse_and_bind("tab: complete")

    if not hr:
        hr = HyREPL()
    hr.interact("{appname} {version}".format(
        appname=hy.__appname__,
        version=hy.__version__
    ))
    readline.write_history_file(history)
    return 0


def run_icommand(source):
    hr = HyREPL()
    hr.runsource(source, filename='<input>', symbol='single')
    return run_repl(hr)


USAGE = "usage: %prog [-h | -i cmd | -c cmd | file | -]"
VERSION = "%prog " + hy.__version__
EPILOG = """  file         program read from script
  -            program read from stdin
"""


def cmdline_handler(scriptname, argv):
    parser = optparse.OptionParser(usage=USAGE, version=VERSION)
    parser.add_option(
        "-c", dest="command", metavar="COMMAND",
        help="program passed in as string")
    parser.add_option(
        "-i", dest="icommand", metavar="ICOMMAND",
        help="program passed in as string, then stay in repl")

    # Hylarious way of adding non-option options to help text
    parser.format_epilog = lambda self: EPILOG

    (options, args) = parser.parse_args()

    if options.command:
        # User did "hy -c ..."
        return run_command(options.command)

    if options.icommand:
        # User did "hy -i ..."
        return run_icommand(options.icommand)

    if args:
        if args[0] == "-":
            # Read the program from stdin
            return run_command(sys.stdin.read())

        else:
            # User did "hy <filename>"
            return run_file(args[0])

    # User did NOTHING!
    return run_repl()