summaryrefslogtreecommitdiffstats
path: root/bitbake/lib/bb/shell.py
blob: feba3f2b442340421e115a20e1db8e5fc03fbb83 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
# ex:ts=4:sw=4:sts=4:et
# -*- tab-width: 4; c-basic-offset: 4; indent-tabs-mode: nil -*-
##########################################################################
#
# Copyright (C) 2005-2006 Michael 'Mickey' Lauer <mickey@Vanille.de>
# Copyright (C) 2005-2006 Vanille Media
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
#
##########################################################################
#
# Thanks to:
# * Holger Freyther <zecke@handhelds.org>
# * Justin Patrin <papercrane@reversefold.com>
#
##########################################################################

"""
BitBake Shell

IDEAS:
    * list defined tasks per package
    * list classes
    * toggle force
    * command to reparse just one (or more) bbfile(s)
    * automatic check if reparsing is necessary (inotify?)
    * frontend for bb file manipulation
    * more shell-like features:
        - output control, i.e. pipe output into grep, sort, etc.
        - job control, i.e. bring running commands into background and foreground
    * start parsing in background right after startup
    * ncurses interface

PROBLEMS:
    * force doesn't always work
    * readline completion for commands with more than one parameters

"""

##########################################################################
# Import and setup global variables
##########################################################################

try:
    set
except NameError:
    from sets import Set as set
import sys, os, readline, socket, httplib, urllib, commands, popen2, copy, shlex, Queue, fnmatch
from bb import data, parse, build, fatal, cache, taskdata, runqueue, providers as Providers

__version__ = "0.5.3.1"
__credits__ = """BitBake Shell Version %s (C) 2005 Michael 'Mickey' Lauer <mickey@Vanille.de>
Type 'help' for more information, press CTRL-D to exit.""" % __version__

cmds = {}
leave_mainloop = False
last_exception = None
cooker = None
parsed = False
debug = os.environ.get( "BBSHELL_DEBUG", "" )

##########################################################################
# Class BitBakeShellCommands
##########################################################################

class BitBakeShellCommands:
    """This class contains the valid commands for the shell"""

    def __init__( self, shell ):
        """Register all the commands"""
        self._shell = shell
        for attr in BitBakeShellCommands.__dict__:
            if not attr.startswith( "_" ):
                if attr.endswith( "_" ):
                    command = attr[:-1].lower()
                else:
                    command = attr[:].lower()
                method = getattr( BitBakeShellCommands, attr )
                debugOut( "registering command '%s'" % command )
                # scan number of arguments
                usage = getattr( method, "usage", "" )
                if usage != "<...>":
                    numArgs = len( usage.split() )
                else:
                    numArgs = -1
                shell.registerCommand( command, method, numArgs, "%s %s" % ( command, usage ), method.__doc__ )

    def _checkParsed( self ):
        if not parsed:
            print "SHELL: This command needs to parse bbfiles..."
            self.parse( None )

    def _findProvider( self, item ):
        self._checkParsed()
        # Need to use taskData for this information
        preferred = data.getVar( "PREFERRED_PROVIDER_%s" % item, cooker.configuration.data, 1 )
        if not preferred: preferred = item
        try:
            lv, lf, pv, pf = Providers.findBestProvider(preferred, cooker.configuration.data, cooker.status)
        except KeyError:
            if item in cooker.status.providers:
                pf = cooker.status.providers[item][0]
            else:
                pf = None
        return pf

    def alias( self, params ):
        """Register a new name for a command"""
        new, old = params
        if not old in cmds:
            print "ERROR: Command '%s' not known" % old
        else:
            cmds[new] = cmds[old]
            print "OK"
    alias.usage = "<alias> <command>"

    def buffer( self, params ):
        """Dump specified output buffer"""
        index = params[0]
        print self._shell.myout.buffer( int( index ) )
    buffer.usage = "<index>"

    def buffers( self, params ):
        """Show the available output buffers"""
        commands = self._shell.myout.bufferedCommands()
        if not commands:
            print "SHELL: No buffered commands available yet. Start doing something."
        else:
            print "="*35, "Available Output Buffers", "="*27
            for index, cmd in enumerate( commands ):
                print "| %s %s" % ( str( index ).ljust( 3 ), cmd )
            print "="*88

    def build( self, params, cmd = "build" ):
        """Build a providee"""
        global last_exception
        globexpr = params[0]
        self._checkParsed()
        names = globfilter( cooker.status.pkg_pn.keys(), globexpr )
        if len( names ) == 0: names = [ globexpr ]
        print "SHELL: Building %s" % ' '.join( names )

        oldcmd = cooker.configuration.cmd
        cooker.configuration.cmd = cmd

        td = taskdata.TaskData(cooker.configuration.abort)
        localdata = data.createCopy(cooker.configuration.data)
        data.update_data(localdata)
        data.expandKeys(localdata)

        try:
            tasks = []
            for name in names:
                td.add_provider(localdata, cooker.status, name)
                providers = td.get_provider(name)

                if len(providers) == 0:
                    raise Providers.NoProvider

                tasks.append([name, "do_%s" % cooker.configuration.cmd])

            td.add_unresolved(localdata, cooker.status)
            
            rq = runqueue.RunQueue(cooker, localdata, cooker.status, td, tasks)
            rq.prepare_runqueue()
            rq.execute_runqueue()

        except Providers.NoProvider:
            print "ERROR: No Provider"
            last_exception = Providers.NoProvider

        except runqueue.TaskFailure, fnids:
            for fnid in fnids:
                print "ERROR: '%s' failed" % td.fn_index[fnid]
            last_exception = runqueue.TaskFailure

        except build.EventException, e:
            print "ERROR: Couldn't build '%s'" % names
            last_exception = e

        cooker.configuration.cmd = oldcmd

    build.usage = "<providee>"

    def clean( self, params ):
        """Clean a providee"""
        self.build( params, "clean" )
    clean.usage = "<providee>"

    def compile( self, params ):
        """Execute 'compile' on a providee"""
        self.build( params, "compile" )
    compile.usage = "<providee>"

    def configure( self, params ):
        """Execute 'configure' on a providee"""
        self.build( params, "configure" )
    configure.usage = "<providee>"

    def edit( self, params ):
        """Call $EDITOR on a providee"""
        name = params[0]
        bbfile = self._findProvider( name )
        if bbfile is not None:
            os.system( "%s %s" % ( os.environ.get( "EDITOR", "vi" ), bbfile ) )
        else:
            print "ERROR: Nothing provides '%s'" % name
    edit.usage = "<providee>"

    def environment( self, params ):
        """Dump out the outer BitBake environment"""
        cooker.showEnvironment()

    def exit_( self, params ):
        """Leave the BitBake Shell"""
        debugOut( "setting leave_mainloop to true" )
        global leave_mainloop
        leave_mainloop = True

    def fetch( self, params ):
        """Fetch a providee"""
        self.build( params, "fetch" )
    fetch.usage = "<providee>"

    def fileBuild( self, params, cmd = "build" ):
        """Parse and build a .bb file"""
        global last_exception
        name = params[0]
        bf = completeFilePath( name )
        print "SHELL: Calling '%s' on '%s'" % ( cmd, bf )

        oldcmd = cooker.configuration.cmd
        cooker.configuration.cmd = cmd

        try:
            cooker.buildFile(bf)
        except parse.ParseError:
            print "ERROR: Unable to open or parse '%s'" % bf
        except build.EventException, e:
            print "ERROR: Couldn't build '%s'" % name
            last_exception = e

        cooker.configuration.cmd = oldcmd
    fileBuild.usage = "<bbfile>"

    def fileClean( self, params ):
        """Clean a .bb file"""
        self.fileBuild( params, "clean" )
    fileClean.usage = "<bbfile>"

    def fileEdit( self, params ):
        """Call $EDITOR on a .bb file"""
        name = params[0]
        os.system( "%s %s" % ( os.environ.get( "EDITOR", "vi" ), completeFilePath( name ) ) )
    fileEdit.usage = "<bbfile>"

    def fileRebuild( self, params ):
        """Rebuild (clean & build) a .bb file"""
        self.fileBuild( params, "rebuild" )
    fileRebuild.usage = "<bbfile>"

    def fileReparse( self, params ):
        """(re)Parse a bb file"""
        bbfile = params[0]
        print "SHELL: Parsing '%s'" % bbfile
        parse.update_mtime( bbfile )
        cooker.bb_cache.cacheValidUpdate(bbfile)
        fromCache = cooker.bb_cache.loadData(bbfile, cooker.configuration.data)
        cooker.bb_cache.sync()
        if False: #fromCache:
            print "SHELL: File has not been updated, not reparsing"
        else:
            print "SHELL: Parsed"
    fileReparse.usage = "<bbfile>"

    def abort( self, params ):
        """Toggle abort task execution flag (see bitbake -k)"""
        cooker.configuration.abort = not cooker.configuration.abort
        print "SHELL: Abort Flag is now '%s'" % repr( cooker.configuration.abort )

    def force( self, params ):
        """Toggle force task execution flag (see bitbake -f)"""
        cooker.configuration.force = not cooker.configuration.force
        print "SHELL: Force Flag is now '%s'" % repr( cooker.configuration.force )

    def help( self, params ):
        """Show a comprehensive list of commands and their purpose"""
        print "="*30, "Available Commands", "="*30
        allcmds = cmds.keys()
        allcmds.sort()
        for cmd in allcmds:
            function,numparams,usage,helptext = cmds[cmd]
            print "| %s | %s" % (usage.ljust(30), helptext)
        print "="*78

    def lastError( self, params ):
        """Show the reason or log that was produced by the last BitBake event exception"""
        if last_exception is None:
            print "SHELL: No Errors yet (Phew)..."
        else:
            reason, event = last_exception.args
            print "SHELL: Reason for the last error: '%s'" % reason
            if ':' in reason:
                msg, filename = reason.split( ':' )
                filename = filename.strip()
                print "SHELL: Dumping log file for last error:"
                try:
                    print open( filename ).read()
                except IOError:
                    print "ERROR: Couldn't open '%s'" % filename

    def match( self, params ):
        """Dump all files or providers matching a glob expression"""
        what, globexpr = params
        if what == "files":
            self._checkParsed()
            for key in globfilter( cooker.status.pkg_fn.keys(), globexpr ): print key
        elif what == "providers":
            self._checkParsed()
            for key in globfilter( cooker.status.pkg_pn.keys(), globexpr ): print key
        else:
            print "Usage: match %s" % self.print_.usage
    match.usage = "<files|providers> <glob>"

    def new( self, params ):
        """Create a new .bb file and open the editor"""
        dirname, filename = params
        packages = '/'.join( data.getVar( "BBFILES", cooker.configuration.data, 1 ).split('/')[:-2] )
        fulldirname = "%s/%s" % ( packages, dirname )

        if not os.path.exists( fulldirname ):
            print "SHELL: Creating '%s'" % fulldirname
            os.mkdir( fulldirname )
        if os.path.exists( fulldirname ) and os.path.isdir( fulldirname ):
            if os.path.exists( "%s/%s" % ( fulldirname, filename ) ):
                print "SHELL: ERROR: %s/%s already exists" % ( fulldirname, filename )
                return False
            print "SHELL: Creating '%s/%s'" % ( fulldirname, filename )
            newpackage = open( "%s/%s" % ( fulldirname, filename ), "w" )
            print >>newpackage,"""DESCRIPTION = ""
SECTION = ""
AUTHOR = ""
HOMEPAGE = ""
MAINTAINER = ""
LICENSE = "GPL"
PR = "r0"

SRC_URI = ""

#inherit base

#do_configure() {
#
#}

#do_compile() {
#
#}

#do_stage() {
#
#}

#do_install() {
#
#}
"""
            newpackage.close()
            os.system( "%s %s/%s" % ( os.environ.get( "EDITOR" ), fulldirname, filename ) )
    new.usage = "<directory> <filename>"

    def package( self, params ):
        """Execute 'package' on a providee"""
        self.build( params, "package" )
    package.usage = "<providee>"

    def pasteBin( self, params ):
        """Send a command + output buffer to the pastebin at http://rafb.net/paste"""
        index = params[0]
        contents = self._shell.myout.buffer( int( index ) )
        sendToPastebin( "output of " + params[0], contents )
    pasteBin.usage = "<index>"

    def pasteLog( self, params ):
        """Send the last event exception error log (if there is one) to http://rafb.net/paste"""
        if last_exception is None:
            print "SHELL: No Errors yet (Phew)..."
        else:
            reason, event = last_exception.args
            print "SHELL: Reason for the last error: '%s'" % reason
            if ':' in reason:
                msg, filename = reason.split( ':' )
                filename = filename.strip()
                print "SHELL: Pasting log file to pastebin..."

                file = open( filename ).read()
                sendToPastebin( "contents of " + filename, file )

    def patch( self, params ):
        """Execute 'patch' command on a providee"""
        self.build( params, "patch" )
    patch.usage = "<providee>"

    def parse( self, params ):
        """(Re-)parse .bb files and calculate the dependency graph"""
        cooker.status = cache.CacheData()
        ignore = data.getVar("ASSUME_PROVIDED", cooker.configuration.data, 1) or ""
        cooker.status.ignored_dependencies = set( ignore.split() )
        cooker.handleCollections( data.getVar("BBFILE_COLLECTIONS", cooker.configuration.data, 1) )

        (filelist, masked) = cooker.collect_bbfiles()
        cooker.parse_bbfiles(filelist, masked, cooker.myProgressCallback)
        cooker.buildDepgraph()
        global parsed
        parsed = True
        print

    def reparse( self, params ):
        """(re)Parse a providee's bb file"""
        bbfile = self._findProvider( params[0] )
        if bbfile is not None:
            print "SHELL: Found bbfile '%s' for '%s'" % ( bbfile, params[0] )
            self.fileReparse( [ bbfile ] )
        else:
            print "ERROR: Nothing provides '%s'" % params[0]
    reparse.usage = "<providee>"

    def getvar( self, params ):
        """Dump the contents of an outer BitBake environment variable"""
        var = params[0]
        value = data.getVar( var, cooker.configuration.data, 1 )
        print value
    getvar.usage = "<variable>"

    def peek( self, params ):
        """Dump contents of variable defined in providee's metadata"""
        name, var = params
        bbfile = self._findProvider( name )
        if bbfile is not None:
            the_data = cooker.bb_cache.loadDataFull(bbfile, cooker.configuration.data)
            value = the_data.getVar( var, 1 )
            print value
        else:
            print "ERROR: Nothing provides '%s'" % name
    peek.usage = "<providee> <variable>"

    def poke( self, params ):
        """Set contents of variable defined in providee's metadata"""
        name, var, value = params
        bbfile = self._findProvider( name )
        if bbfile is not None:
            print "ERROR: Sorry, this functionality is currently broken"
            #d = cooker.pkgdata[bbfile]
            #data.setVar( var, value, d )

            # mark the change semi persistant
            #cooker.pkgdata.setDirty(bbfile, d)
            #print "OK"
        else:
            print "ERROR: Nothing provides '%s'" % name
    poke.usage = "<providee> <variable> <value>"

    def print_( self, params ):
        """Dump all files or providers"""
        what = params[0]
        if what == "files":
            self._checkParsed()
            for key in cooker.status.pkg_fn.keys(): print key
        elif what == "providers":
            self._checkParsed()
            for key in cooker.status.providers.keys(): print key
        else:
            print "Usage: print %s" % self.print_.usage
    print_.usage = "<files|providers>"

    def python( self, params ):
        """Enter the expert mode - an interactive BitBake Python Interpreter"""
        sys.ps1 = "EXPERT BB>>> "
        sys.ps2 = "EXPERT BB... "
        import code
        interpreter = code.InteractiveConsole( dict( globals() ) )
        interpreter.interact( "SHELL: Expert Mode - BitBake Python %s\nType 'help' for more information, press CTRL-D to switch back to BBSHELL." % sys.version )

    def showdata( self, params ):
        """Show the parsed metadata for a given providee"""
        cooker.showEnvironment(None, params)
    showdata.usage = "<providee>"

    def setVar( self, params ):
        """Set an outer BitBake environment variable"""
        var, value = params
        data.setVar( var, value, cooker.configuration.data )
        print "OK"
    setVar.usage = "<variable> <value>"

    def rebuild( self, params ):
        """Clean and rebuild a .bb file or a providee"""
        self.build( params, "clean" )
        self.build( params, "build" )
    rebuild.usage = "<providee>"

    def shell( self, params ):
        """Execute a shell command and dump the output"""
        if params != "":
            print commands.getoutput( " ".join( params ) )
    shell.usage = "<...>"

    def stage( self, params ):
        """Execute 'stage' on a providee"""
        self.build( params, "stage" )
    stage.usage = "<providee>"

    def status( self, params ):
        """<just for testing>"""
        print "-" * 78
        print "building list = '%s'" % cooker.building_list
        print "build path = '%s'" % cooker.build_path
        print "consider_msgs_cache = '%s'" % cooker.consider_msgs_cache
        print "build stats = '%s'" % cooker.stats
        if last_exception is not None: print "last_exception = '%s'" % repr( last_exception.args )
        print "memory output contents = '%s'" % self._shell.myout._buffer

    def test( self, params ):
        """<just for testing>"""
        print "testCommand called with '%s'" % params

    def unpack( self, params ):
        """Execute 'unpack' on a providee"""
        self.build( params, "unpack" )
    unpack.usage = "<providee>"

    def which( self, params ):
        """Computes the providers for a given providee"""
        # Need to use taskData for this information
        item = params[0]

        self._checkParsed()

        preferred = data.getVar( "PREFERRED_PROVIDER_%s" % item, cooker.configuration.data, 1 )
        if not preferred: preferred = item

        try:
            lv, lf, pv, pf = Providers.findBestProvider(preferred, cooker.configuration.data, cooker.status)
        except KeyError:
            lv, lf, pv, pf = (None,)*4

        try:
            providers = cooker.status.providers[item]
        except KeyError:
            print "SHELL: ERROR: Nothing provides", preferred
        else:
            for provider in providers:
                if provider == pf: provider = " (***) %s" % provider
                else:              provider = "       %s" % provider
                print provider
    which.usage = "<providee>"

##########################################################################
# Common helper functions
##########################################################################

def completeFilePath( bbfile ):
    """Get the complete bbfile path"""
    if not cooker.status: return bbfile
    if not cooker.status.pkg_fn: return bbfile
    for key in cooker.status.pkg_fn.keys():
        if key.endswith( bbfile ):
            return key
    return bbfile

def sendToPastebin( desc, content ):
    """Send content to http://oe.pastebin.com"""
    mydata = {}
    mydata["lang"] = "Plain Text"
    mydata["desc"] = desc
    mydata["cvt_tabs"] = "No"
    mydata["nick"] = "%s@%s" % ( os.environ.get( "USER", "unknown" ), socket.gethostname() or "unknown" )
    mydata["text"] = content
    params = urllib.urlencode( mydata )
    headers = {"Content-type": "application/x-www-form-urlencoded","Accept": "text/plain"}

    host = "rafb.net"
    conn = httplib.HTTPConnection( "%s:80" % host )
    conn.request("POST", "/paste/paste.php", params, headers )

    response = conn.getresponse()
    conn.close()

    if response.status == 302:
        location = response.getheader( "location" ) or "unknown"
        print "SHELL: Pasted to http://%s%s" % ( host, location )
    else:
        print "ERROR: %s %s" % ( response.status, response.reason )

def completer( text, state ):
    """Return a possible readline completion"""
    debugOut( "completer called with text='%s', state='%d'" % ( text, state ) )

    if state == 0:
        line = readline.get_line_buffer()
        if " " in line:
            line = line.split()
            # we are in second (or more) argument
            if line[0] in cmds and hasattr( cmds[line[0]][0], "usage" ): # known command and usage
                u = getattr( cmds[line[0]][0], "usage" ).split()[0]
                if u == "<variable>":
                    allmatches = cooker.configuration.data.keys()
                elif u == "<bbfile>":
                    if cooker.status.pkg_fn is None: allmatches = [ "(No Matches Available. Parsed yet?)" ]
                    else: allmatches = [ x.split("/")[-1] for x in cooker.status.pkg_fn.keys() ]
                elif u == "<providee>":
                    if cooker.status.pkg_fn is None: allmatches = [ "(No Matches Available. Parsed yet?)" ]
                    else: allmatches = cooker.status.providers.iterkeys()
                else: allmatches = [ "(No tab completion available for this command)" ]
            else: allmatches = [ "(No tab completion available for this command)" ]
        else:
            # we are in first argument
            allmatches = cmds.iterkeys()

        completer.matches = [ x for x in allmatches if x[:len(text)] == text ]
        #print "completer.matches = '%s'" % completer.matches
    if len( completer.matches ) > state:
        return completer.matches[state]
    else:
        return None

def debugOut( text ):
    if debug:
        sys.stderr.write( "( %s )\n" % text )

def columnize( alist, width = 80 ):
    """
    A word-wrap function that preserves existing line breaks
    and most spaces in the text. Expects that existing line
    breaks are posix newlines (\n).
    """
    return reduce(lambda line, word, width=width: '%s%s%s' %
                  (line,
                   ' \n'[(len(line[line.rfind('\n')+1:])
                         + len(word.split('\n',1)[0]
                              ) >= width)],
                   word),
                  alist
                 )

def globfilter( names, pattern ):
    return fnmatch.filter( names, pattern )

##########################################################################
# Class MemoryOutput
##########################################################################

class MemoryOutput:
    """File-like output class buffering the output of the last 10 commands"""
    def __init__( self, delegate ):
        self.delegate = delegate
        self._buffer = []
        self.text = []
        self._command = None

    def startCommand( self, command ):
        self._command = command
        self.text = []
    def endCommand( self ):
        if self._command is not None:
            if len( self._buffer ) == 10: del self._buffer[0]
            self._buffer.append( ( self._command, self.text ) )
    def removeLast( self ):
        if self._buffer:
            del self._buffer[ len( self._buffer ) - 1 ]
        self.text = []
        self._command = None
    def lastBuffer( self ):
        if self._buffer:
            return self._buffer[ len( self._buffer ) -1 ][1]
    def bufferedCommands( self ):
        return [ cmd for cmd, output in self._buffer ]
    def buffer( self, i ):
        if i < len( self._buffer ):
            return "BB>> %s\n%s" % ( self._buffer[i][0], "".join( self._buffer[i][1] ) )
        else: return "ERROR: Invalid buffer number. Buffer needs to be in (0, %d)" % ( len( self._buffer ) - 1 )
    def write( self, text ):
        if self._command is not None and text != "BB>> ": self.text.append( text )
        if self.delegate is not None: self.delegate.write( text )
    def flush( self ):
        return self.delegate.flush()
    def fileno( self ):
        return self.delegate.fileno()
    def isatty( self ):
        return self.delegate.isatty()

##########################################################################
# Class BitBakeShell
##########################################################################

class BitBakeShell:

    def __init__( self ):
        """Register commands and set up readline"""
        self.commandQ = Queue.Queue()
        self.commands = BitBakeShellCommands( self )
        self.myout = MemoryOutput( sys.stdout )
        self.historyfilename = os.path.expanduser( "~/.bbsh_history" )
        self.startupfilename = os.path.expanduser( "~/.bbsh_startup" )

        readline.set_completer( completer )
        readline.set_completer_delims( " " )
        readline.parse_and_bind("tab: complete")

        try:
            readline.read_history_file( self.historyfilename )
        except IOError:
            pass  # It doesn't exist yet.

        print __credits__

    def cleanup( self ):
        """Write readline history and clean up resources"""
        debugOut( "writing command history" )
        try:
            readline.write_history_file( self.historyfilename )
        except:
            print "SHELL: Unable to save command history"

    def registerCommand( self, command, function, numparams = 0, usage = "", helptext = "" ):
        """Register a command"""
        if usage == "": usage = command
        if helptext == "": helptext = function.__doc__ or "<not yet documented>"
        cmds[command] = ( function, numparams, usage, helptext )

    def processCommand( self, command, params ):
        """Process a command. Check number of params and print a usage string, if appropriate"""
        debugOut( "processing command '%s'..." % command )
        try:
            function, numparams, usage, helptext = cmds[command]
        except KeyError:
            print "SHELL: ERROR: '%s' command is not a valid command." % command
            self.myout.removeLast()
        else:
            if (numparams != -1) and (not len( params ) == numparams):
                print "Usage: '%s'" % usage
                return

            result = function( self.commands, params )
            debugOut( "result was '%s'" % result )

    def processStartupFile( self ):
        """Read and execute all commands found in $HOME/.bbsh_startup"""
        if os.path.exists( self.startupfilename ):
            startupfile = open( self.startupfilename, "r" )
            for cmdline in startupfile:
                debugOut( "processing startup line '%s'" % cmdline )
                if not cmdline:
                    continue
                if "|" in cmdline:
                    print "ERROR: '|' in startup file is not allowed. Ignoring line"
                    continue
                self.commandQ.put( cmdline.strip() )

    def main( self ):
        """The main command loop"""
        while not leave_mainloop:
            try:
                if self.commandQ.empty():
                    sys.stdout = self.myout.delegate
                    cmdline = raw_input( "BB>> " )
                    sys.stdout = self.myout
                else:
                    cmdline = self.commandQ.get()
                if cmdline:
                    allCommands = cmdline.split( ';' )
                    for command in allCommands:
                        pipecmd = None
                        #
                        # special case for expert mode
                        if command == 'python':
                            sys.stdout = self.myout.delegate
                            self.processCommand( command, "" )
                            sys.stdout = self.myout
                        else:
                            self.myout.startCommand( command )
                            if '|' in command: # disable output
                                command, pipecmd = command.split( '|' )
                                delegate = self.myout.delegate
                                self.myout.delegate = None
                            tokens = shlex.split( command, True )
                            self.processCommand( tokens[0], tokens[1:] or "" )
                            self.myout.endCommand()
                            if pipecmd is not None: # restore output
                                self.myout.delegate = delegate

                                pipe = popen2.Popen4( pipecmd )
                                pipe.tochild.write( "\n".join( self.myout.lastBuffer() ) )
                                pipe.tochild.close()
                                sys.stdout.write( pipe.fromchild.read() )
                        #
            except EOFError:
                print
                return
            except KeyboardInterrupt:
                print

##########################################################################
# Start function - called from the BitBake command line utility
##########################################################################

def start( aCooker ):
    global cooker
    cooker = aCooker
    bbshell = BitBakeShell()
    bbshell.processStartupFile()
    bbshell.main()
    bbshell.cleanup()

if __name__ == "__main__":
    print "SHELL: Sorry, this program should only be called by BitBake."