pmacs3/application.py

#!/usr/bin/env python
import curses, curses.ascii, getpass, os, re, string, sets, sys, termios, time
import traceback

import buffer2, bufferlist, color, completer, keyinput, method, minibuffer
import util, window2
from point2 import Point

# modes
import mode2
import mode_mini, mode_search, mode_replace, mode_which
import mode_console, mode_consolemini
import mode_c, mode_python, mode_perl, mode_nasm, mode_sh, mode_sql
import mode_blame, mode_diff
import mode_xml, mode_tt, mode_css, mode_javascript, mode_html
import mode_text, mode_mutt
import mode_bds, mode_life

def run(buffers, jump_to_line=None, init_mode=None):
    # save terminal state so we can restore it when the program exits
    attr = termios.tcgetattr(sys.stdin)
    keyinput.disable_control_chars()

    retval = 1
    try:
        retval = curses.wrapper(run_app, buffers, jump_to_line, init_mode)
    except:
        traceback.print_exc()

    # restore terminal state
    termios.tcsetattr(sys.stdin, termios.TCSANOW, attr)
    return retval

def run_app(stdscr, buffers, jump_to_line=None, init_mode=None):
    a = Application(stdscr, buffers, jump_to_line, init_mode)
    a.run()

KILL_RING_LIMIT = 128
WORD_LETTERS = list(string.letters + string.digits)
ERROR_TIMEOUT = -1
#ERROR_TIMEOUT = 2

#DARK_BACKGROUND = False
DARK_BACKGROUND = True

class Application(object):
    def __init__(self, stdscr, buffers=[], jump_to_line=None, init_mode=None):
        # initalize curses primitives
        self.stdscr = stdscr
        (self.y, self.x) = self.stdscr.getmaxyx()

        # initialize some basic stuff
        # each highlighted_range contains three things: [window, start_p, end_p]
        self.highlighted_ranges = [] 
        self.mini_active        = False
        self.mini_buffer        = None
        self.mini_prompt        = ""
        self.error_string       = ""
        self.error_timestamp    = None
        self.input              = keyinput.Handler()

        # initialize our colors
        if curses.has_colors():
            curses.start_color()
            try:
                curses.use_default_colors()
                color.default_color = True
            except:
                # guess we weren't on 2.4
                color.default_color = False
        color.init()

        # this is how we can change color settings
        if curses.can_change_color():
            #curses.init_color(curses.COLOR_BLUE, 750, 400, 0)
            pass
        else:
            self.set_error("Dynamic color not available")

        # initialize our modes
        self.modes = {
            'blame':       mode_blame.Blame,
            'c':           mode_c.C,
            'console':     mode_console.Console,
            'consolemini': mode_consolemini.Console,
            'diff':        mode_diff.Diff,
            'fundamental': mode2.Fundamental,
            'mini':        mode_mini.Mini,
            'nasm':        mode_nasm.Nasm,
            'perl':        mode_perl.Perl,
            'python':      mode_python.Python,
            'replace':     mode_replace.Replace,
            'search':      mode_search.Search,
            'sh':          mode_sh.Sh,
            'text':        mode_text.Text,
            'which':       mode_which.Which,
            'xml':         mode_xml.XML,
            'html':        mode_html.HTML,
            'css':         mode_css.CSS,
            'life':        mode_life.Life,
            'mutt':        mode_mutt.Mutt,
            'javascript':  mode_javascript.Javascript,
            'sql':         mode_sql.Sql,
            'template':    mode_tt.Template,
            'bds':         mode_bds.BDS
        }

        # these are used in this order to determine which mode to open certain
        # kinds of files
        self.mode_paths = {
            '/etc/profile': 'sh',
        }
        self.mode_basenames = {
            '.bashrc':        'sh',
            '.bash_profile':  'sh',
            '.profile':       'sh',
            'components.xml': 'bds',
        }
        self.mode_extensions = {
            '.py':     'python',
            '.pl':     'perl',
            '.pm':     'perl',
            '.t':      'perl',
            '.c':      'c',
            '.txt':    'text',
            '.s':      'nasm',
            '.sh':     'sh',
            '.bash':   'sh',
            '.xml':    'xml',
            '.xml.in': 'xml',
            '.html':   'html',
            '.htm':    'html',
            '.js':     'javascript',
            '.sql':    'sql',
            '.tt':     'template',
            '.css':    'css',
        }
        self.mode_detection = {
            'python': 'python',
            'perl':   'perl',
            'sh':     'sh',
            'bash':   'sh',
        }

        # initialize our methods
        self.methods = {}
        for name in dir(method):
            cls = eval("method.%s" % name)
            if hasattr(cls, '_is_method') and cls._is_method:
                self.methods[cls._name()] = cls()

        # create all the insert methods for the character ranges we like
        for c in string.letters + string.digits + string.punctuation:
            obj = method.InsertString(c)
            self.methods[obj.name] = obj

        # window/slot height/width
        height = self.y - 2
        width  = self.x - 1

        # initialize our buffers
        # note that the first buffer in buffers will be initially visible
        buffers.append(buffer2.ScratchBuffer())
        buffers.append(buffer2.ConsoleBuffer())
        self.bufferlist = bufferlist.BufferList(height, width)
        self.active_slot = 0

        # build windows for our buffers
        for b in buffers:
            if b.name() == '*Console*':
                window2.Window(b, self, height, width, mode_name='console')
            else:
                window2.Window(b, self, height, width, mode_name=init_mode)
            self.bufferlist.add_buffer(b)
        self.bufferlist.set_slot(0, buffers[0])

        # see if the user has requested that we go to a particular line
        if jump_to_line:
            w = self.bufferlist.slots[0].window
            method.GotoLine().execute(w, lineno=jump_to_line)

        # initialize our kill ring and last action
        self.kill_ring           = []
        self.kill_commands       = ['kill', 'kill-region']
        self.last_action         = None
        self.last_search         = None
        self.last_replace_before = None
        self.last_replace_after  = None
        self.registers           = {}

        # initialize tab handlers
        method.DATATYPES['path']         = completer.FileCompleter()
        method.DATATYPES['buffer']       = completer.BufferCompleter(self)
        method.DATATYPES['command']      = completer.CommandCompleter()
        method.DATATYPES['shell']        = completer.ShellCompleter()
        method.DATATYPES['method']       = completer.MethodCompleter()
        method.DATATYPES['mode']         = completer.ModeCompleter()
        method.DATATYPES['perlfunction'] = completer.PerlFunctionCompleter()

        # set up curses
        self.win = curses.newwin(self.y, self.x, 0, 0)
        self.win.leaveok(0)
        curses.meta(1)
        curses.halfdelay(1)

    def globals(self):
        return globals()
    def locals(self):
        return locals()

    def add_slot(self):
        # XYZ
        b = self.bufferlist.slots[self.active_slot].window.buffer
        n = self.bufferlist.add_slot()
        self.bufferlist.set_slot(n, b)
    def remove_slot(self, n):
        assert len(self.bufferlist.slots) > 1, "oh no you didn't!"
        assert n >= 0 and n < len(self.bufferlist.slots), \
            "invalid slot: %r (%r)" % (n, len(self.bufferlist.slots))
        self.bufferlist.remove_slot(n)
        if self.active_slot > n:
            self.active_slot = max(0, self.active_slot - 1) #XYZ
    def single_slot(self):
        while len(self.bufferlist.slots) > 1:
            if self.active_slot == 0:
                self.remove_slot(1)
            else:
                self.remove_slot(0)

    def get_window_height_width(self, i):
        assert i >= 0 and i < len(self.bufferlist.slots), \
            "invalid slot: %r" % slotname
        slot = self.bufferlist.slots[i]
        return (slot.height, slot.width)

    # files and stuff
    def open_path(self, path, cipher=None, password=None):
        path = os.path.abspath(os.path.realpath(util.expand_tilde(path)))
        b = self.get_buffer_by_path(path)
        if b is None:
            name = os.path.basename(path)
            if self.has_buffer_name(name):
                i = 1
                auxname = '%s/%d' % (name, i)
                while self.has_buffer_name(auxname):
                    i += 1
                    auxname = '%s/%d' % (name, i)
                name = auxname

            mode_name = None
            if cipher is None:
                if not os.path.exists(path) or os.path.isfile(path):
                    b = buffer2.FileBuffer(path, name=name)
                elif os.path.isdir(path):
                    b = buffer2.DirBuffer(path, name=name)
                    mode_name = 'fundamental'
                else:
                    raise Exception, "not a file or dir: %r" % path
            elif cipher == 'aes':
                if not password:
                    raise Exception, "password is required"
                if not os.path.exists(path) or os.path.isfile(path):
                    b = buffer2.AesBuffer(path, password, name=name)
                else:
                    raise Exception, "not a file or dir: %r" % path
            b.open()
            window2.Window(b, self, height=0, width=0, mode_name=mode_name)
            self.add_buffer(b)
        return b

    # mini buffer handling
    def get_mini_buffer(self):
        return self.mini_buffer
    def mini_buffer_is_open(self):
        return self.mini_buffer is not None
    def open_mini_buffer(self, prompt, callback, method=None, tabber=None, modename=None):
        if self.mini_buffer_is_open():
            self.close_mini_buffer()
        self.mini_prompt = prompt
        self.mini_buffer = minibuffer.MiniBuffer(callback, method, tabber, modename)
        try:
            window2.Window(self.mini_buffer, self, height=1,
                           width=self.x-1-len(self.mini_prompt)-1)
            self.mini_active = True
        except minibuffer.MiniBufferError:
            self.mini_buffer = None
            self.mini_prompt = ''
    def exec_mini_buffer(self):
        self.mini_buffer.callback(self.mini_buffer.make_string())
        self.close_mini_buffer()
    def close_mini_buffer(self):
        self.mini_active = False
        if self.mini_buffer_is_open():
            self.mini_buffer.close()
        self.mini_buffer = None
        self.mini_prompt = ""
        assert not self.mini_active
    def get_mini_buffer_prompt(self):
        return self.mini_prompt
    def set_mini_buffer_prompt(self, p):
        self.mini_prompt = p

    # window handling
    def toggle_window(self):
        assert 0 <= self.active_slot and self.active_slot < len(self.bufferlist.slots)
        self.active_slot = (self.active_slot + 1) % len(self.bufferlist.slots) #XYZ
    def window(self):
        return self.bufferlist.slots[self.active_slot].window
    def active_window(self):
        if self.mini_active:
            return self.mini_buffer.windows[0]
        else:
            assert 0 <= self.active_slot and self.active_slot < len(self.bufferlist.slots), \
                "0 <= %d < %d" % (self.active_slot, len(self.bufferlist.slots))
            i = self.active_slot
            return self.bufferlist.slots[i].window

    # buffer handling
    def file_buffer(self, path, data, switch_to=True):
        assert not self.has_buffer_name(path), 'oh no! %r is already open' % path
        assert not os.path.exists(path), 'oh no! %r already exists in fs' % path
        f = open(path, 'w')
        f.write(data)
        f.close()
        b = buffer2.FileBuffer(path)
        b.open()
        window2.Window(b, self, height=0, width=0)
        self.add_buffer(b)
        if switch_to:
            self.switch_buffer(b)
    def data_buffer(self, name, data, switch_to=True, modename=None):
        if self.has_buffer_name(name):
            b = self.bufferlist.buffer_names[name]
            self.remove_buffer(b)
        b = buffer2.DataBuffer(name, data)
        if modename is not None:
            b.modename = modename
        window2.Window(b, self, height=0, width=0)
        self.add_buffer(b)
        if switch_to:
            self.switch_buffer(b)
    def get_buffer_by_path(self, path):
        return self.bufferlist.get_buffer_by_path(path)
    def has_buffer_name(self, name):
        return self.bufferlist.has_buffer_name(name)
    def get_buffer_by_name(self, name):
        return self.bufferlist.get_buffer_by_name(name)
    def has_buffer(self, b):
        return self.bufferlist.has_buffer(b)
    def add_buffer(self, b):
        self.bufferlist.add_buffer(b)
    def remove_buffer(self, b):
        assert b.name() is not "*Scratch*", "can't kill the scratch"
        assert self.bufferlist.has_buffer(b), "can't kill what's not there"
        assert len(self.bufferlist.buffers) > 1, "can't kill with no other buffers"
        self.bufferlist.remove_buffer(b)
        b.close()
        if self.bufferlist.empty_slot(self.active_slot):
            b2 = self.bufferlist.hidden_buffers[0]
            self.bufferlist.set_slot(self.active_slot, b2)
    def switch_buffer(self, b):
        assert self.has_buffer_name(b.name()), "buffer %s does not exist" % (b.name())
        assert 0 <= self.active_slot and self.active_slot < len(self.bufferlist.slots)
        #self.add_window_to_buffer(b, self.active_slot)
        self.bufferlist.set_slot(self.active_slot, b)

    def add_window_to_buffer(self, b, slotname):
        # XYZ
        if not b.has_window(slotname):
            slot = self.bufferlist.slots[slotname]
            window2.Window(b, self, height=slot.height, width=slot.width)

    # error string handling
    def set_error(self, s):
        self.error_string = s
        self.error_timestamp = time.time()
    def clear_error(self):
        self.error_string = ""
        self.error_timestamp = None
    def resize_event(self):
        self.y, self.x = self.stdscr.getmaxyx()
        self.resize_slots()
    def resize_slots(self):
        n = len(self.bufferlist.slots)
        assert n > 0
        x = self.x - 1
        y_sum = self.y - 1 - n
        # XYZ this method seems broken
        self.bufferlist.resize(x, y_sum)

    # exit
    def exit(self):
        self.done = True

    # kill stack manipulation
    def push_kill(self, s):
        if s is not None:
            if self.last_action in self.kill_commands and \
                len(self.kill_ring):
                self.kill_ring[-1] = self.kill_ring[-1] + s
            else:
                self.kill_ring.append(s)
        if KILL_RING_LIMIT and len(self.kill_ring) > KILL_RING_LIMIT:
            self.kill_ring.pop(0)
    def pop_kill(self):
        return self.kill_ring.pop(-1)
    def has_kill(self, i=-1):
        return len(self.kill_ring) >= abs(i)
    def get_kill(self, i=-1):
        return self.kill_ring[i]

    # undo/redo
    def undo(self):
        try:
            self.window().undo()
        except Exception, e:
            self.set_error("%s" % (e))
    def redo(self):
        try:
            self.window().redo()
        except Exception, e:
            self.set_error("%s" % (e))

    # action creating methods
    def make_insert_action(self, c):
        return lambda: self.window().insert_string(c)
    def make_window_action(self, methodname):
        f = getattr(self.window(), methodname)
        f()

    # we are evil
    def eval(self, s):
        return eval(s)

    # the mighty run-loop!
    def run(self):
        self.done = False
        while not self.done:
            i = self.win.getch()
            if i == curses.KEY_RESIZE:
                while i == curses.KEY_RESIZE:
                    i = self.win.getch()
                self.resize_event()
            err = ''
            try:
                self.input.parse(i)
            except Exception, e:
                err = str(e)
            while len(self.input.tokens):
                t = self.input.tokens.pop(0)
                self.active_window().mode.handle_token(t)
            self.draw()
            if err:
                self.set_error(err)
            if self.error_timestamp is not None and ERROR_TIMEOUT > 0 and \
                time.time() - self.error_timestamp > ERROR_TIMEOUT:
                self.clear_error()

        # clear the error line; it might look confusing to the user
        try:
            self.win.addstr(self.y-1, 0, ' ' * self.x)
        except:
            pass
        self.win.refresh()
        return

    # highlighting
    # each highlighted_range contains three things: [window, start_p, end_p]
    def add_highlighted_range(self, w, p1, p2, fg='default', bg='default'):
        self.highlighted_ranges.append([w, p1, p2, fg, bg])
    def clear_highlighted_ranges(self):
        self.highlighted_ranges = []

    # full screen drawer
    def draw(self):
        self.draw_slots()
        self.draw_input_bar()
        self.draw_cursor()
        self.win.noutrefresh()
        curses.doupdate()

    def draw_cursor(self):
        if self.mini_active:
            b = self.mini_buffer
            w = b.windows[0]
            p = w.logical_cursor()
            if p.y >= len(b.lines):
                return
            (vy, vx) = (self.y - 1, min(p.x + len(self.mini_prompt), self.x - 2))
        else:
            slot = self.bufferlist.slots[self.active_slot]
            w = slot.window
            if w.active_point is not None and w.point_is_visible(w.active_point):
                p = w.active_point
            else:
                p = w.logical_cursor()
            count = 0
            (x, y) = w.first.xy()
            (vy, vx) = (None, None)
            while count < slot.height:
                if p.y == y and p.x >= x and p.x <= x + slot.width:
                    (vy, vx) = (slot.offset + count, p.x - x)
                    break
                if x + slot.width >= len(w.buffer.lines[y]):
                    x = 0
                    y += 1
                else:
                    x += slot.width
                count += 1
        if vy is None or vx is None:
            return
        try:
            self.win.move(vy, vx)
        except:
            raise Exception, "(%d,%d==%r) was illegal (%d,%d)" % \
                (vx, vy, p, self.x, self.y)

    # sub-drawing methods
    def draw_slots(self):
        self.win.erase()
        for i in range(0, len(self.bufferlist.slots)):
            slot = self.bufferlist.slots[i]
            self.draw_slot(i)
            self.draw_status_bar(i)

    def highlight_char(self, sy, sx, fg='default', bg='default'):
        junk = self.win.inch(sy, sx)
        char = junk & 255
        #attr = color.build(fg, bg, curses.A_REVERSE)
        attr = color.build(fg, bg)
        try:
            self.win.addch(sy, sx, char, attr)
        except:
            raise Exception, "(%d, %d, %r, %r) v. (%d, %d)" % \
                (sy, sx, fg, bg, self.y, self.x)

    def highlight_chars(self, sy, sx1, sx2, fg='default', bg='default'):
        assert sx2 < self.x, "%d < %d" % (sx2, self.x)
        for x in range(sx1, sx2):
            self.highlight_char(sy, x, fg, bg)

    def draw_slot(self, i):
        assert self.active_slot < len(self.bufferlist.slots), "only two"
        assert i < len(self.bufferlist.slots), "only three"
        slot = self.bufferlist.slots[i]
        if slot.window is None:
            return
        w = slot.window
        modename = w.mode.name()

        if modename in w.buffer.highlights:
            self._draw_slot_lit(i)
        else:
            self._draw_slot_raw(i)

        # highlighted regions
        for (high_w, p1, p2, fg, bg) in self.highlighted_ranges:
            if w is high_w and p2 >= w.first and p1 <= w.last:
                count = 0
                (x, y) = w.first.xy()
                px = p1.x
                while count < slot.height:
                    if p1.y == y and px >= x and px - x < slot.width:
                        if slot.width > p2.x - x:
                            self.highlight_chars(slot.offset + count, px-x, p2.x-x, fg, bg)
                            break
                        else:
                            self.highlight_chars(slot.offset + count, px-x, slot.width, fg, bg)
                            px += slot.width - px + x
                    if x + slot.width >= len(w.buffer.lines[y]):
                        x = 0
                        y += 1
                    else:
                        x += slot.width
                    count += 1

        if w.margins_visible:
            for (limit, shade) in w.margins:
                #if limit <= self.x:
                if limit < self.x:
                    for j in range(0, slot.height):
                        char = self.win.inch(j + slot.offset, limit) & 255
                        attr = color.build('default', shade, 'bold')
                        self.win.addch(j + slot.offset, limit, char, attr)

    def _draw_slot_raw(self, i):
        slot     = self.bufferlist.slots[i]
        w        = slot.window
        modename = w.mode.name()
        redattr  = color.build_attr(color.pairs('red', 'default'))

        (x, y) = w.first.xy()
        lines   = w.buffer.lines
        count   = 0
        while count < slot.height:
            if y >= len(lines):
                self.win.addstr(slot.offset + count, 0, '~', redattr)
                count += 1
                continue

            line = lines[y]
            s    = line[x:x + slot.width]
            self.win.addstr(slot.offset + count, 0, s)
            if x + slot.width >= len(line):
                x = 0
                y += 1
            else:
                self.win.addch(slot.offset + count, slot.width, '\\', redattr)
                x += slot.width
            count += 1

    def _draw_slot_lit(self, i):
        slot        = self.bufferlist.slots[i]
        w           = slot.window
        modename    = w.mode.name()
        redattr     = color.build_attr(color.pairs('red', 'default'))
        highlighter = w.buffer.highlights[modename]

        (x, y) = w.first.xy()
        j     = 0
        count = 0
        assert len(w.buffer.lines) == len(highlighter.tokens)
        while count < slot.height:
            if y < len(w.buffer.lines):
                while j < len(highlighter.tokens[y]):
                    token = highlighter.tokens[y][j]
                    if token.string.endswith('\n'):
                        tstring = token.string[:-1]
                    else:
                        tstring = token.string
                        
                    assert token.y == y, '%d == %d' % (token.y, y)

                    s_offset = max(x - token.x, 0)
                    x_offset = max(token.x - x, 0)
                    assert x_offset <= slot.width, '%d <= %d' % (x_offset, slot.width)

                    s          = tstring[s_offset:] 
                    token_done = x_offset + len(s) <= slot.width
                    token_wrap = x_offset + len(s) > slot.width
                    attr = color.build(*token.color)
                    self.win.addstr(slot.offset + count, x_offset, s[:slot.width - x_offset], attr)

                    if token_wrap:
                        self.win.addch(slot.offset + count, slot.width, '\\', redattr)
                        x += slot.width
                        count += 1
                    if token_done:
                        j += 1
                    if count >= slot.height:
                        break

                # we have finished this logical line of tokens
                j = x = 0
                y       += 1
                count   += 1
            else:
                self.win.addstr(slot.offset + count, 0, '~', redattr)
                count += 1

    def draw_status_bar(self, slotname):
        slot = self.bufferlist.slots[slotname]
        if slot.window is None:
            return

        w      = slot.window
        b      = w.buffer
        cursor = w.logical_cursor()
        first  = w.first
        last   = w.last

        if b.readonly():
            if b.changed():
                modflag = '%*'
            else:
                modflag = '%%'
        else:
            if b.changed():
                modflag = '**'
            else:
                modflag = '--'

        if w.mark:
            mark = w.mark
        else:
            mark = Point(-1, -1)
        name = b.name()

        if w.first_is_visible():
            perc = "Top"
        elif w.last_is_visible():
            perc = "Bot"
        else:
            perc = "%2d%%" % (first.y*100 / len(b.lines))

        # XYZ: we should actually use more of the 'state' variables
        format = "%s  %-18s  (%s)--L%d--C%d--%s"
        status = format % (modflag, name, w.mode.name(), cursor.y+1, cursor.x+1, perc)
        #format = "%s  %-18s  (%s)--L%d--C%d--%s %s %s %s"
        #status = format % (modflag, name, w.mode.name(), cursor.y+1, cursor.x+1, perc, w.first, cursor, w.last)

        status = status[:slot.width + 1]
        status += "-" * (slot.width - len(status) + 1)
        self.win.addnstr(slot.height + slot.offset, 0, status, slot.width + 1,
                         curses.A_REVERSE)

    # input bar drawing
    def draw_input_bar(self):
        if self.error_string:
            self.draw_error()
        elif self.mini_buffer_is_open():
            self.draw_mini_buffer()
        else:
            self.draw_nothing()
        try:
            # fucking python, fucking curses, fucking fuck
            self.win.addch(self.y-1, self.x-1, ' ')
        except:
            pass
    def draw_error(self):
        l = self.x - 1
        s1 = self.error_string
        s2 = util.cleanse(util.padtrunc(s1, l))
        self.win.addnstr(self.y-1, 0, s2, l)
    def draw_mini_buffer(self):
        l = self.x - 1
        b = self.mini_buffer
        s1 = self.mini_prompt + b.lines[0]
        s2 = util.padtrunc(s1, l)
        self.win.addnstr(self.y-1, 0, s2, l)

    def draw_nothing(self):
        l = self.x - 1
        self.win.addnstr(self.y-1, 0, util.pad('', l), l)

def open_aes_file(path, nl, name=None):
    p = getpass.getpass("Please enter the AES password: ")
    b = buffer2.AesBuffer(path, p, nl, name)
    return b
def open_plain_file(path, nl, name=None):
    b = buffer2.FileBuffer(path, nl, name)
    return b

if __name__ == "__main__":
    ciphers   = { 'none': open_plain_file, 'aes': open_aes_file }
    linetypes = { 'win': '\r\n', 'mac': '\r', 'unix': '\n' }

    import optparse

    parser = optparse.OptionParser()
    parser.set_defaults(debug=False)
    parser.set_defaults(goto=None)
    parser.set_defaults(mode=None)
    parser.set_defaults(cipher='none')
    parser.set_defaults(linetype='unix')

    parser.add_option('-d', '--debug', dest='debug', action='store_true',
                      help='run in debug mode')
    parser.add_option('-e', '--encrypt', dest='cipher', metavar='CIPHER',
                      help='decrypt and encrypt with CIPHER (default: none)')
    parser.add_option('-g', '--goto', dest='goto', metavar='NUM', type='int',
                      help='jump to line NUM of the first argument')
    parser.add_option('-l', '--line-end', dest='linetype', metavar='TYPE',
                      help='use TYPE (win,mac,unix) line endings (default: unix)')
    parser.add_option('-m', '--mode', dest='mode', metavar='MODE',
                      help='open arguments in MODE')

    (opts, args) = parser.parse_args()

    # if debugging, disable error handling to produce backtraces
    if opts.debug:
        mode2.DEBUG = True

    # we will support using +19 as the first argument to indicate opening the
    # first file on line 19 (same as -g 19 or --goto 19)
    if len(args) > 0 and args[0].startswith('+'):
        opts.goto = int(args[0][1:])
        args = args[1:]

    if opts.goto is not None:
        opts.goto += 1

    # figure out which kind of line types we're using
    if opts.linetype not in linetypes:
        sys.stderr.write('invalid linetype: %r' % opts.linetype)
        sys.exit(1)
    nl = linetypes[opts.linetype]

    # figure out what kind of file open function to use
    if opts.cipher not in ciphers:
        sys.stderr.write('invalid cipher: %r' % opts.cipher)
        sys.exit(2)
    f = ciphers[opts.cipher]

    # open each path using our callback to get a buffer, open that buffer, etc.
    buffers = []
    names   = sets.Set()
    paths   = sets.Set()
    for path in args:
        path = os.path.abspath(os.path.realpath(util.expand_tilde(path)))
        if path in paths:
            continue
        name = os.path.basename(path)
        if name in names:
            i = 1
            auxname = '%s/%d' % (name, i)
            while auxname in names:
                i += 1
                auxname = '%s/%d' % (name, i)
            name = auxname
        b = f(path, nl, name)
        b.open()
        buffers.append(b)
        paths.add(path)
        names.add(name)

    # ok, now run our app
    run(buffers, opts.goto, opts.mode)