mdw@git.distorted.org.uk Git - xtoys/blob - xgetline.in

   1 #! @PYTHON@
   2 ### -*-python-*-
   3 ###
   4 ### Utility module for xtoys Python programs
   5 ###
   6 ### (c) 2007 Straylight/Edgeware
   7 ###
   8
   9 ###----- Licensing notice ---------------------------------------------------
  10 ###
  11 ### This file is part of the Edgeware XT tools collection.
  12 ###
  13 ### XT tools is free software; you can redistribute it and/or modify
  14 ### it under the terms of the GNU General Public License as published by
  15 ### the Free Software Foundation; either version 2 of the License, or
  16 ### (at your option) any later version.
  17 ###
  18 ### XT tools is distributed in the hope that it will be useful,
  19 ### but WITHOUT ANY WARRANTY; without even the implied warranty of
  20 ### MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21 ### GNU General Public License for more details.
  22 ###
  23 ### You should have received a copy of the GNU General Public License
  24 ### along with XT tools; if not, write to the Free Software Foundation,
  25 ### Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  26
  27 VERSION = '@VERSION@'
  28
  29 ###--------------------------------------------------------------------------
  30 ### External dependencies.
  31
  32 import optparse as O
  33 from sys import stdout, stderr, exit
  34 import os as OS
  35 import errno as E
  36
  37 import xtoys as XT
  38 GTK, GDK, GO = XT.GTK, XT.GDK, XT.GO
  39
  40 ###--------------------------------------------------------------------------
  41 ### Entry classes.
  42
  43 ### These package up the mess involved with the different kinds of dialogue
  44 ### box xgetline can show.  The common interface is informal, but looks like
  45 ### this:
  46 ###
  47 ### ready(): prepare the widget for action
  48 ### value(): extract the value the user entered
  49 ### setvalue(VALUE): show VALUE as the existing value in the widget
  50 ### sethistory(HISTORY): store the HISTORY in the widget's history list
  51 ### gethistory(): extract the history list back out again
  52
  53 def setup_entry(entry):
  54   """Standard things to do to an entry widget."""
  55   entry.grab_focus()
  56   entry.set_activates_default(True)
  57
  58 class SimpleEntry (GTK.Entry):
  59   """A plain old Entry widget with no bells or whistles."""
  60   def setvalue(me, value):
  61     me.set_text(value)
  62   def ready(me):
  63     setup_entry(me)
  64   def value(me):
  65     return me.get_text()
  66   def gethistory(me):
  67     return ()
  68
  69 class ModelMixin (object):
  70   """
  71   A helper mixin for classes which make use of a TreeModel.
  72
  73   It provides the sethistory and gethistory methods for the common widget
  74   interface, and can produce a CellRenderer for stuffing into the viewer
  75   widget, whatever that might be.
  76   """
  77
  78   def __init__(me):
  79     """Initialize the ModelMixin."""
  80     me.model = GTK.ListStore(GO.TYPE_STRING)
  81     me.set_model(me.model)
  82
  83   def setlayout(me):
  84     """Insert a CellRenderer for displaying history items into the widget."""
  85     cell = GTK.CellRendererText()
  86     me.pack_start(cell)
  87     me.set_attributes(cell, text = 0)
  88
  89   def sethistory(me, history):
  90     """Write the HISTORY into the model."""
  91     for line in history:
  92       me.model.append([line])
  93
  94   def gethistory(me):
  95     """Extract the history from the model."""
  96     return (l[0] for l in me.model)
  97
  98 class Combo (ModelMixin, GTK.ComboBox):
  99   """
 100   A widget which uses a non-editable Combo box for entry.
 101   """
 102
 103   def __init__(me):
 104     """Initialize the widget."""
 105     GTK.ComboBox.__init__(me)
 106     ModelMixin.__init__(me)
 107     me.setlayout()
 108
 109   def sethistory(me, history):
 110     """
 111     Insert the HISTORY.
 112
 113     We have to select some item, so it might as well be the first one.
 114     """
 115     ModelMixin.sethistory(me, history)
 116     me.set_active(0)
 117
 118   def ready(me):
 119     """Nothing special needed to make us ready."""
 120     pass
 121
 122   def setvalue(me, value):
 123     """
 124     Store a value in the widget.
 125
 126     This involves finding it in the list and setting it by index.  I suppose
 127     I could keep a dictionary, but it seems bad to have so many copies.
 128     """
 129     for i in xrange(len(me.model)):
 130       if me.model[i][0] == value:
 131         me.set_active(i)
 132
 133   def value(me):
 134     """Extract the current selection."""
 135     return me.model[me.get_active()][0]
 136
 137 class ComboEntry (ModelMixin, GTK.ComboBoxEntry):
 138   """
 139   A widget which uses an editable combo box.
 140   """
 141
 142   def __init__(me):
 143     """
 144     Initialize the widget.
 145     """
 146     GTK.ComboBoxEntry.__init__(me)
 147     ModelMixin.__init__(me)
 148     me.set_text_column(0)
 149
 150   def ready(me):
 151     """
 152     Set up the entry widget.
 153
 154     We grab the arrow keys to step through the history.
 155     """
 156     setup_entry(me.child)
 157     me.child.connect('key-press-event', me.press)
 158
 159   def press(me, _, event):
 160     """
 161     Handle key-press events.
 162
 163     Specifically, up and down to move through the history.
 164     """
 165     if GDK.keyval_name(event.keyval) in ('Up', 'Down'):
 166       me.popup()
 167       return True
 168     return False
 169
 170   def setvalue(me, value):
 171     me.child.set_text(value)
 172   def value(me):
 173     return me.child.get_text()
 174
 175 ###--------------------------------------------------------------------------
 176 ### Utility functions.
 177
 178 def chomped(lines):
 179   """For each line in LINES, generate a line without trailing newline."""
 180   for line in lines:
 181     if line != '' and line[-1] == '\n':
 182       line = line[:-1]
 183     yield line
 184
 185 ###--------------------------------------------------------------------------
 186 ### Create the window.
 187
 188 def escape(_, event, win):
 189   """Key-press handler: on escape, destroy WIN."""
 190   if GDK.keyval_name(event.keyval) == 'Escape':
 191     win.destroy()
 192     return True
 193   return False
 194
 195 def accept(_, entry, win):
 196   """OK button handler: store user's value and end."""
 197   global result
 198   result = entry.value()
 199   win.destroy()
 200   return True
 201
 202 def make_window(opts):
 203   """
 204   Make and return the main window.
 205   """
 206
 207   ## Create the window.
 208   win = GTK.Window(GTK.WINDOW_TOPLEVEL)
 209   win.set_title(opts.title)
 210   win.set_position(GTK.WIN_POS_MOUSE)
 211   win.connect('destroy', lambda _: XT.delreason())
 212
 213   ## Make a horizontal box for the widgets.
 214   box = GTK.HBox(spacing = 4)
 215   box.set_border_width(4)
 216   win.add(box)
 217
 218   ## If we have a prompt, insert it.
 219   if opts.prompt is not None:
 220     box.pack_start(GTK.Label(opts.prompt), False)
 221
 222   ## Choose the appropriate widget.
 223   if opts.file is None:
 224     entry = SimpleEntry()
 225     opts.history = False
 226     if opts.invisible:
 227       entry.set_visibility(False)
 228   else:
 229     if opts.nochoice:
 230       entry = Combo()
 231     else:
 232       entry = ComboEntry()
 233     try:
 234       entry.sethistory(chomped(open(opts.file, 'r')))
 235     except IOError, error:
 236       if error.errno == E.ENOENT and opts.history:
 237         pass
 238       else:
 239         raise
 240
 241   ## Insert the widget and configure it.
 242   box.pack_start(entry, True)
 243   if opts.default == '@':
 244     try:
 245       entry.setvalue(entry.gethistory.__iter__.next())
 246     except StopIteration:
 247       pass
 248   elif opts.default is not None:
 249     entry.setvalue(opts.default)
 250   entry.ready()
 251
 252   ## Sort out the OK button.
 253   ok = GTK.Button('OK')
 254   ok.set_flags(ok.flags() | GTK.CAN_DEFAULT)
 255   box.pack_start(ok, False)
 256   ok.connect('clicked', accept, entry, win)
 257   ok.grab_default()
 258
 259   ## Handle escape.
 260   win.connect('key-press-event', escape, win)
 261
 262   ## Done.
 263   win.show_all()
 264   return entry
 265
 266 ###--------------------------------------------------------------------------
 267 ### Option parsing.
 268
 269 def parse_args():
 270   """
 271   Parse the command line, returning a triple (PARSER, OPTS, ARGS).
 272   """
 273
 274   op = XT.make_optparse \
 275        ([('H', 'history',
 276           {'action': 'store_true', 'dest': 'history',
 277            'help': "With `--list', update with new string."}),
 278          ('M', 'history-max',
 279           {'type': 'int', 'dest': 'histmax',
 280            'help': "Maximum number of items written back to file."}),
 281          ('d', 'default',
 282           {'dest': 'default',
 283            'help': "Set the default entry."}),
 284          ('i', 'invisible',
 285           {'action': 'store_true', 'dest': 'invisible',
 286            'help': "Don't show the user's string as it's typed."}),
 287          ('l', 'list',
 288           {'dest': 'file',
 289            'help': "Read FILE into a drop-down list."}),
 290          ('n', 'no-choice',
 291           {'action': 'store_true', 'dest': 'nochoice',
 292            'help': "No free text input: user must choose item from list."}),
 293          ('p', 'prompt',
 294           {'dest': 'prompt',
 295            'help': "Set the window's prompt string."}),
 296          ('t', 'title',
 297           {'dest': 'title',
 298            'help': "Set the window's title string."})],
 299         version = VERSION,
 300         usage = '%prog [-Hin] [-M HISTMAX] [-p PROMPT] [-l FILE] [-t TITLE]')
 301
 302   op.set_defaults(title = 'Input request',
 303                   invisible = False,
 304                   prompt = None,
 305                   file = None,
 306                   nochoice = False,
 307                   history = False,
 308                   histmax = 20)
 309
 310   opts, args = op.parse_args()
 311   return op, opts, args
 312
 313 ###--------------------------------------------------------------------------
 314 ### Main program.
 315
 316 result = None
 317
 318 def main():
 319
 320   ## Startup.
 321   op, opts, args = parse_args()
 322   if len(args) > 0:
 323     op.print_usage(stderr)
 324     exit(1)
 325   entry = make_window(opts)
 326   XT.addreason()
 327   GTK.main()
 328
 329   ## Closedown.
 330   if result is None:
 331     exit(1)
 332   if opts.history:
 333     try:
 334       new = '%s.new' % opts.file
 335       out = open(new, 'w')
 336       print >>out, result
 337       i = 0
 338       for l in entry.gethistory():
 339         if opts.histmax != 0 and i >= opts.histmax:
 340           break
 341         if l != result:
 342           print >>out, l
 343           i += 1
 344       out.close()
 345       OS.rename(new, opts.file)
 346     finally:
 347       try:
 348         OS.unlink(new)
 349       except OSError, err:
 350         if err.errno != E.ENOENT:
 351           raise
 352   print result
 353   exit(0)
 354
 355 if __name__ == '__main__':
 356   main()
 357
 358 ###----- That's all, folks --------------------------------------------------