Richard Wolff's changes:

pdb.py  Uses the Breakpoint class so one can enable/disable breakpoints,
	set temporary ones, set ignore counts, and conditions.  The last
	can be set using the 'b' command
		b 243 , i>4		( b 243,i>4 if you are space adverse)
	or with the condition command so conditions can be changed
	for a particular breakpoint.

	Breakpoints are numbered from 1 on, and if a breakpoint is deleted,
	the number is not reused.  All the breakpoint handling commands
	refer to breakpoints by number.  To be consistent, the clear command
	does so as well, which is the one change from the original pdb that
	is not transparent.  Thus only the breakpoint command 'b' uses a
	line number or file:line or method.  You can also give
		b whrandom.random    and the method will be searched for along
	sys.path.  This is implemented with an 'egrep' command and so
	is not as portable as it might be.  [ see  lineinfo() and
	lineinfoCmd ]

	Breakpoints cannot be set at a line that is blank or a '#' comment
	or starts a triply quoted comment.  This is because I would like
	this behavior in my DDD interface and think it reasonable for
	pdb as well.  It can be removed readily, however as it is all
	incorporated in the routine checkline().  If one attempts to
	set a breakpoint at a 'def' line, the breakpoint is automatically
	moved to the first executable line after the 'def'.  This too is
	in checkline().

	do_EOF() returns zero so typing an end-of-file character as a command
	does nothing.  'quit' does the quitting.

	The routine defaultFile() is present so as to preserve the current
	pdb behavior and yet allow me to override it in pydb.

	There's some code in lineinfo() that is probably mainly useful only
	for pydb and if you prefer, much up to the comment "Best first guess"
	could be removed.

	Keith Davidson provided the code for handling $HOME/.pdbrc and
	./.pdbrc, and it has been incorporated.  He also provided the
	alias handling routine.  I modified it a bit so it could live
	nicely in precmd().  He and I have been in contact; he has the
	new pdb (and pydb) with his code incorporated.  He also asked
	about the possibility of allowing multiple commands on one
	line, such as step;step  or s;s  or with an alias such as
		alias ct tbreak %1 ; continue
	and since it was so easy, that's in place as well.  It's a simple
	'split the line at the first ";"' operation and puts the second
	half in the command queue (self.cmdqueue).  This has the unfortunate
	effect of destroying a line like   print "i: "+i+"; j: "+j
	but either there's a simple way to deal with this, or my attitude
	will remain that pdb is a debugger, not a compiler/parser/etc.
	An alias like   alias 4s  s;;s;
	will work because the adjacent and trailing ";" act like a <cr> which
	repeats the last command.  Of course, either s;s;s;s or s;;;  would be
	a bit more sensible.

	The help commands have been updated.

1 files changed, 351 insertions, 59 deletions

diff --git a/Lib/pdb.py b/Lib/pdb.py
index f7462a9..b0c1a17 100755
--- a/Lib/pdb.py
+++ b/Lib/pdb.py
@@ -26,11 +26,34 @@ class Pdb(bdb.Bdb, cmd.Cmd):
 		bdb.Bdb.__init__(self)
 		cmd.Cmd.__init__(self)
 		self.prompt = '(Pdb) '
+		self.lineinfoCmd = 'egrep -n "def *%s *[(:]" %s /dev/null'
+		self.aliases = {}
 		# Try to load readline if it exists
 		try:
 			import readline
 		except ImportError:
 			pass
+
+		# Read $HOME/.pdbrc and ./.pdbrc
+		self.rcLines = []
+		if os.environ.has_key('HOME'):
+			envHome = os.environ['HOME']
+			try:
+				rcFile = open (envHome + "/.pdbrc")
+			except IOError:
+				pass
+			else:
+				for line in rcFile.readlines():
+					self.rcLines.append (line)
+				rcFile.close()
+		try:
+			rcFile = open ("./.pdbrc")
+		except IOError:
+			pass
+		else:
+			for line in rcFile.readlines():
+				self.rcLines.append (line)
+			rcFile.close()
 	
 	def reset(self):
 		bdb.Bdb.reset(self)
@@ -46,6 +69,19 @@ class Pdb(bdb.Bdb, cmd.Cmd):
 		self.forget()
 		self.stack, self.curindex = self.get_stack(f, t)
 		self.curframe = self.stack[self.curindex][0]
+		self.execRcLines();
+
+	# Can be executed earlier than 'setup' if desired
+	def execRcLines(self):
+		if self.rcLines:
+			# Make local copy because of recursion
+			rcLines = self.rcLines
+			# executed only once
+			self.rcLines = []
+			for line in rcLines:
+				line = line[:-1]
+				if len (line) > 0 and line[0] != '#':
+					self.onecmd (line)
 	
 	# Override Bdb methods (except user_call, for now)
 	
@@ -91,16 +127,49 @@ class Pdb(bdb.Bdb, cmd.Cmd):
 			else: exc_type_name = t.__name__
 			print '***', exc_type_name + ':', v
 
+	def precmd(self, line):
+		# Handle alias expansion and ';' separator
+		if not line:
+			return line
+		args = string.split(line)
+		while self.aliases.has_key(args[0]):
+			line = self.aliases[args[0]]
+			ii = 1
+			for tmpArg in args[1:]:
+				line = string.replace(line, "%" + str(ii),
+						      tmpArg)
+				ii = ii + 1
+			line = string.replace (line, "%*",
+					       string.join(args[1:], ' '))
+			args = string.split(line)
+		# split into ';' separated commands
+		# unless it's an alias command
+		if args[0] != 'alias':
+			semicolon = string.find(line, ';')
+			if semicolon >= 0:
+				# queue up everything after semicolon
+				next = string.lstrip(line[semicolon+1:])
+				self.cmdqueue.append(next)
+				line = string.rstrip(line[:semicolon])
+		return line
+
 	# Command definitions, called by cmdloop()
 	# The argument is the remaining string on the command line
 	# Return true to exit from the command loop 
 	
 	do_h = cmd.Cmd.do_help
 
-	def do_break(self, arg):
+	def do_EOF(self, arg):
+		return 0	# Don't die on EOF
+
+	def do_break(self, arg, temporary = 0):
 		# break [ ([filename:]lineno | function) [, "condition"] ]
 		if not arg:
-			print self.get_all_breaks() # XXX
+			if self.breaks:  # There's at least one
+				print "Num Type         Disp Enb   Where"
+				for bp in bdb.Breakpoint.bpbynumber:
+					if bp:
+						bp.bpprint()
 			return
 		# parse arguments; comma has lowest precendence
 		# and cannot occur in filename
@@ -112,19 +181,17 @@ class Pdb(bdb.Bdb, cmd.Cmd):
 			# parse stuff after comma: "condition"
 			cond = string.lstrip(arg[comma+1:])
 			arg = string.rstrip(arg[:comma])
-			try:
-				cond = eval(
-					cond,
-					self.curframe.f_globals,
-					self.curframe.f_locals)
-			except:
-				print '*** Could not eval condition:', cond
-				return
 		# parse stuff before comma: [filename:]lineno | function
 		colon = string.rfind(arg, ':')
 		if colon >= 0:
 			filename = string.rstrip(arg[:colon])
-			filename = self.lookupmodule(filename)
+			f = self.lookupmodule(filename)
+			if not f:
+				print '*** ', `filename`,
+				print 'not found from sys.path'
+				return
+			else:
+				filename = f
 			arg = string.lstrip(arg[colon+1:])
 			try:
 				lineno = int(arg)
@@ -141,29 +208,180 @@ class Pdb(bdb.Bdb, cmd.Cmd):
 						    self.curframe.f_globals,
 						    self.curframe.f_locals)
 				except:
-					print '*** Could not eval argument:',
-					print arg
-					return
+					func = arg
 				try:
 					if hasattr(func, 'im_func'):
 						func = func.im_func
 					code = func.func_code
-				except:
-					print '*** The specified object',
-					print 'is not a function', arg
-					return
-				lineno = code.co_firstlineno
-				if not filename:
+					lineno = code.co_firstlineno
 					filename = code.co_filename
-		# supply default filename if necessary
+				except:
+					# last thing to try
+					(ok, filename, ln) = self.lineinfo(arg)
+					if not ok:
+					    print '*** The specified object',
+					    print `arg`,
+					    print 'is not a function'
+					    print ('or was not found '
+						   'along sys.path.')
+					    return
+					lineno = int(ln)
 		if not filename:
-			filename = self.curframe.f_code.co_filename
-		# now set the break point
-		err = self.set_break(filename, lineno, cond)
-		if err: print '***', err
+			filename = self.defaultFile()
+		# Check for reasonable breakpoint
+		line = self.checkline(filename, lineno)
+		if line:
+			# now set the break point
+			err = self.set_break(filename, line, temporary, cond)
+			if err: print '***', err
+
+	# To be overridden in derived debuggers
+	def defaultFile(self):
+		# Produce a reasonable default
+		filename = self.curframe.f_code.co_filename
+		if filename == '<string>' and mainpyfile:
+			filename = mainpyfile
+		return filename
 
 	do_b = do_break
 	
+	def do_tbreak(self, arg):
+		self.do_break(arg, 1)
+
+	def lineinfo(self, identifier):
+		failed = (None, None, None)
+		# Input is identifier, may be in single quotes
+		idstring = string.split(identifier, "'")
+		if len(idstring) == 1:
+			# not in single quotes
+			id = string.strip(idstring[0])
+		elif len(idstring) == 3:
+			# quoted
+			id = string.strip(idstring[1])
+		else:
+			return failed
+		if id == '': return failed
+		parts = string.split(id, '.')
+		# Protection for derived debuggers
+		if parts[0] == 'self':
+			del parts[0]
+			if len(parts) == 0:
+				return failed
+		# Best first guess at file to look at
+		fname = self.defaultFile()
+		if len(parts) == 1:
+			item = parts[0]
+		else:
+			# More than one part.
+			# First is module, second is method/class
+			f = self.lookupmodule(parts[0])
+			if f:
+				fname = f
+			item = parts[1]
+		grepstring = self.lineinfoCmd % (item, fname)
+		answer = os.popen(grepstring, 'r').readline()
+		if answer:
+			f, line, junk = string.split(answer, ':', 2)
+			return(item, f,line)
+		else:
+			return failed
+		
+	def checkline(self, filename, lineno):
+		"""Return line number of first line at or after input
+		argument such that if the input points to a 'def', the
+		returned line number is the first
+		non-blank/non-comment line to follow.  If the input
+		points to a blank or comment line, return 0.  At end
+		of file, also return 0."""
+
+		line = linecache.getline(filename, lineno)
+		if not line:
+			print 'End of file'
+			return 0
+		line = string.strip(line)
+		# Don't allow setting breakpoint at a blank line
+		if ( not line or (line[0] == '#') or
+		     (line[:3] == '"""') or line[:3] == "'''" ):
+			print '*** Blank or comment'
+			return 0
+		# When a file is read in and a breakpoint is at
+		# the 'def' statement, the system stops there at
+		# code parse time.  We don't want that, so all breakpoints
+		# set at 'def' statements are moved one line onward
+		if line[:3] == 'def':
+			incomment = ''
+			while 1:
+				lineno = lineno+1
+				line = linecache.getline(filename, lineno)
+				if not line:
+					print 'end of file'
+					return 0
+				line = string.strip(line)
+				if incomment:
+					if len(line) < 3: continue
+					if (line[-3:] == incomment):
+						incomment = ''
+					continue
+				if not line: continue	# Blank line
+				if len(line) >= 3:
+					if (line[:3] == '"""'
+					    or line[:3] == "'''"):
+						incomment = line[:3]
+						continue
+				if line[0] != '#': break
+		return lineno
+
+	def do_enable(self, arg):
+		args = string.split(arg)
+		for i in args:
+			bp = bdb.Breakpoint.bpbynumber[int(i)]
+			if bp:
+				bp.enable()
+
+	def do_disable(self, arg):
+		args = string.split(arg)
+		for i in args:
+			bp = bdb.Breakpoint.bpbynumber[int(i)]
+			if bp:
+				bp.disable()
+
+	def do_condition(self, arg):
+		# arg is breakpoint number and condition
+		args = string.split(arg, ' ', 1)
+		bpnum = int(string.strip(args[0]))
+		try:
+			cond = args[1]
+		except:
+			cond = None
+		bp = bdb.Breakpoint.bpbynumber[bpnum]
+		if bp:
+			bp.cond = cond
+			if not cond:
+				print 'Breakpoint', bpnum,
+				print 'is now unconditional.'
+
+	def do_ignore(self,arg):
+		# arg is bp number followed by ignore count
+		args = string.split(arg)
+		bpnum = int(string.strip(args[0]))
+		try:
+			count = int(string.strip(args[1]))
+		except:
+			count = 0
+		bp = bdb.Breakpoint.bpbynumber[bpnum]
+		if bp:
+			bp.ignore = count
+			if (count > 0):
+				reply = 'Will ignore next '
+				if (count > 1):
+					reply = reply + '%d crossings' % count
+				else:
+					reply = reply + '1 crossing'
+				print reply + ' of breakpoint %d.' % bpnum
+			else:
+				print 'Will stop next time breakpoint',
+				print bpnum, 'is reached.'
+
 	def do_clear(self, arg):
 		if not arg:
 			try:
@@ -174,21 +392,13 @@ class Pdb(bdb.Bdb, cmd.Cmd):
 			if reply in ('y', 'yes'):
 				self.clear_all_breaks()
 			return
-		filename = None
-		colon = string.rfind(arg, ':')
-		if colon >= 0:
-			filename = string.rstrip(arg[:colon])
-			filename = self.lookupmodule(filename)
-			arg = string.lstrip(arg[colon+1:])
-		try:
-			lineno = int(arg)
-		except:
-			print '*** Bad lineno:', `arg`
-			return
-		if not filename:
-			filename = self.curframe.f_code.co_filename
-		err = self.clear_break(filename, lineno)
-		if err: print '***', err
+		numberlist = string.split(arg)
+		for i in numberlist:
+			err = self.clear_break(i)
+			if err:
+				print '***'+err
+			else:
+				print 'Deleted breakpoint %s ' % (i,)
 	do_cl = do_clear # 'c' is already an abbreviation for 'continue'
 	
 	def do_where(self, arg):
@@ -263,7 +473,7 @@ class Pdb(bdb.Bdb, cmd.Cmd):
 	
 	def do_p(self, arg):
 		try:
-			value = eval(arg, self.curframe.f_globals, \
+			value = eval(arg, self.curframe.f_globals,
 					self.curframe.f_locals)
 		except:
 			t, v = sys.exc_info()[:2]
@@ -322,7 +532,7 @@ class Pdb(bdb.Bdb, cmd.Cmd):
 
 	def do_whatis(self, arg):
 		try:
-			value = eval(arg, self.curframe.f_globals, \
+			value = eval(arg, self.curframe.f_globals,
 					self.curframe.f_locals)
 		except:
 			t, v = sys.exc_info()[:2]
@@ -346,7 +556,26 @@ class Pdb(bdb.Bdb, cmd.Cmd):
 			return
 		# None of the above...
 		print type(value)
-	
+
+	def do_alias(self, arg):
+		args = string.split (arg)
+		if len(args) == 0:
+			keys = self.aliases.keys()
+			keys.sort()
+			for alias in keys:
+				print "%s = %s" % (alias, self.aliases[alias])
+			return
+		if self.aliases.has_key(args[0]) and len (args) == 1:
+			print "%s = %s" % (args[0], self.aliases[args[0]])
+		else:
+			self.aliases[args[0]] = string.join(args[1:], ' ')
+
+	def do_unalias(self, arg):
+		args = string.split (arg)
+		if len(args) == 0: return
+		if self.aliases.has_key(args[0]):
+			del self.aliases[args[0]]
+
 	# Print a traceback starting at the top stack frame.
 	# The most recently entered frame is printed last;
 	# this is different from dbx and gdb, but consistent with
@@ -414,28 +643,57 @@ class Pdb(bdb.Bdb, cmd.Cmd):
 	def help_b(self):
 		print """b(reak) ([file:]lineno | function) [, "condition"]
 	With a line number argument, set a break there in the current
-	file.  With a function name, set a break at the entry of that
-	function.  Without argument, list all breaks.  If a second
+	file.  With a function name, set a break at first executable line
+	of that function.  Without argument, list all breaks.  If a second
 	argument is present, it is a string specifying an expression
 	which must evaluate to true before the breakpoint is honored.
 
 	The line number may be prefixed with a filename and a colon,
 	to specify a breakpoint in another file (probably one that
-	hasn't been loaded yet).  The file is searched on sys.path;
+	hasn't been loaded yet).  The file is searched for on sys.path;
 	the .py suffix may be omitted."""
 
 	def help_clear(self):
 		self.help_cl()
 
 	def help_cl(self):
-		print """cl(ear) [file:][lineno]
-	With a line number argument, clear that break in the current file.
-	Without argument, clear all breaks (but first ask confirmation).
-
-	The line number may be prefixed with a filename and a colon,
-	to specify a breakpoint in another file (probably one that
-	hasn't been loaded yet).  The file is searched on sys.path;
-	the .py suffix may be omitted."""
+		print """cl(ear) [bpnumber [bpnumber...]]
+	With a space separated list of breakpoint numbers, clear
+	those breakpoints.  Without argument, clear all breaks (but
+	first ask confirmation).
+
+	Note that the argument is different from previous versions of
+	the debugger (in python distributions 1.5.1 and before) where
+	a linenumber was used instead of breakpoint numbers."""
+
+	def help_tbreak(self):
+		print """tbreak  same arguments as break, but breakpoint is
+	removed when first hit."""
+
+	def help_enable(self):
+		print """enable bpnumber [bpnumber ...]
+	Enables the breakpoints given as a space separated list of
+	bp numbers."""
+
+	def help_disable(self):
+		print """disable bpnumber [bpnumber ...]
+	Disables the breakpoints given as a space separated list of
+	bp numbers."""
+
+	def help_ignore(self):
+		print """ignore bpnumber count
+	Sets the ignore count for the given breakpoint number.  A breakpoint
+	becomes active when the ignore count is zero.  When non-zero, the
+	count is decremented each time the breakpoint is reached and the
+	breakpoint is not disabled and any associated condition evaluates
+	to true."""
+
+	def help_condition(self):
+		print """condition bpnumber str_condition
+	str_condition is a string specifying an expression which
+	must evaluate to true before the breakpoint is honored.
+	If str_condition is absent, any existing condition is removed;
+	i.e., the breakpoint is made unconditional."""
 
 	def help_step(self):
 		self.help_s()
@@ -511,26 +769,60 @@ class Pdb(bdb.Bdb, cmd.Cmd):
 		print """q(uit)	Quit from the debugger.
 	The program being executed is aborted."""
 
+	def help_whatis(self):
+		print """whatis arg
+	Prints the type of the argument."""
+
+	def help_EOF(self):
+		print """EOF
+	Handles the receipt of EOF as a command."""
+
+	def help_alias(self):
+		print """alias [name [command [parameter parameter ...] ]]
+	Creates an alias called 'name' the executes 'command'.  The command
+	must *not* be enclosed in quotes.  Replaceable parameters are
+	indicated by %1, %2, and so on, while %* is replaced by all the 
+	parameters.  If no command is given, the current alias for name
+	is shown. If no name is given, all aliases are listed.
+	
+	Aliases may be nested and can contain anything that can be
+	legally typed at the pdb prompt.  Note!  You *can* override
+	internal pdb commands with aliases!  Those internal commands
+	are then hidden until the alias is removed.  Aliasing is recursively
+	applied to the first word of the command line; all other words
+	in the line are left alone.
+
+	Some useful aliases (especially when placed in the .pdbrc file) are:
+
+	#Print instance variables (usage "pi classInst")
+	alias pi for k in %1.__dict__.keys(): print "%1.",k,"=",%1.__dict__[k]
+
+	#Print instance variables in self
+	alias ps pi self
+	"""
+
+	def help_unalias(self):
+		print """unalias name
+	Deletes the specified alias."""
+
 	def help_pdb(self):
 		help()
 
 	# Helper function for break/clear parsing -- may be overridden
 
 	def lookupmodule(self, filename):
-		if filename == mainmodule:
-			return mainpyfile
 		root, ext = os.path.splitext(filename)
 		if ext == '':
 			filename = filename + '.py'
 		if os.path.isabs(filename):
 			return filename
 		for dirname in sys.path:
+			while os.path.islink(dirname):
+				dirname = os.readlink(dirname)
 			fullname = os.path.join(dirname, filename)
 			if os.path.exists(fullname):
 				return fullname
-		print 'Warning:', `filename`, 'not found from sys.path'
-		return filename
-
+		return None
 
 # Simplified interface