Chris Muller uploaded a new version of CommandLine to project Squeak 4.6:
http://source.squeak.org/squeak46/CommandLine-cmm.4.mcz

==================== Summary ====================

Name: CommandLine-cmm.4
Author: cmm
Time: 16 January 2015, 3:27:43.102 pm
UUID: 0a2ab805-2910-49f5-81dc-c7de4581f4f6
Ancestors: CommandLine-fbs.3

Let Errors print themselves.

==================== Snapshot ====================

SystemOrganization addCategory: #'CommandLine-Tools'!
SystemOrganization addCategory: #'CommandLine-UIManager'!

UIManager subclass: #DummyUIManager
	instanceVariableNames: ''
	classVariableNames: ''
	poolDictionaries: ''
	category: 'CommandLine-UIManager'!

!DummyUIManager commentStamp: 'fbs 10/31/2013 07:36' prior: 0!
I'm an alternative UIManager used to run an the image without GUI.  I redefine methods which require user input as these requests are irrelevant in a headless environment. !

----- Method: DummyUIManager>>checkForNewDisplaySize (in category 'display') -----
checkForNewDisplaySize
	Display extent = DisplayScreen actualScreenSize ifTrue: [^ self].
	DisplayScreen startUp.
!

----- Method: DummyUIManager>>chooseDirectory:from: (in category 'ui requests') -----
chooseDirectory: label from: dir
	^ nil!

----- Method: DummyUIManager>>chooseFrom:lines:title: (in category 'ui requests') -----
chooseFrom: aList lines: linesArray title: aString
	^ aList first!

----- Method: DummyUIManager>>chooseFrom:values:lines:title: (in category 'ui requests') -----
chooseFrom: labelList values: valueList lines: linesArray title: aString
	^ valueList first!

----- Method: DummyUIManager>>confirm: (in category 'ui requests') -----
confirm: queryString
	(ProvideAnswerNotification signal: queryString)
		ifNotNil: [:answer|^answer].

	self error: 'No user response possible'!

----- Method: DummyUIManager>>confirm:orCancel: (in category 'ui requests') -----
confirm: aString orCancel: cancelBlock
	(ProvideAnswerNotification signal: aString) ifNotNil: [:answer |
	^answer == #cancel ifTrue: [cancelBlock value] ifFalse: [answer]].

	self error: 'No user response possible'!

----- Method: DummyUIManager>>displayProgress:at:from:to:during: (in category 'ui requests') -----
displayProgress: titleString at: aPoint from: minVal to: maxVal during: workBlock
	^ workBlock value: Association new!

----- Method: DummyUIManager>>edit:label:accept: (in category 'ui requests') -----
edit: aText label: labelString accept: anAction
	^ nil!

----- Method: DummyUIManager>>fontFromUser: (in category 'ui requests') -----
fontFromUser: priorFont
	self error: 'No user response possible'!

----- Method: DummyUIManager>>inform: (in category 'ui requests') -----
inform: aString
	"Nothing to be done here"!

----- Method: DummyUIManager>>informUserDuring: (in category 'ui requests') -----
informUserDuring: aBlock
	aBlock value: nil!

----- Method: DummyUIManager>>newDisplayDepthNoRestore: (in category 'display') -----
newDisplayDepthNoRestore: pixelSize
	"Change depths.  Check if there is enough space!!  , di"
	| area need |
	pixelSize = Display depth ifTrue: [^ self  "no change"].
	pixelSize abs < Display depth ifFalse:
		["Make sure there is enough space"
		area := Display boundingBox area. "pixels"

		need := (area * (pixelSize abs - Display depth) // 8)  "new bytes needed"
				+ Smalltalk lowSpaceThreshold.
		(Smalltalk garbageCollectMost <= need
			and: [Smalltalk garbageCollect <= need])
			ifTrue: [self error: 'Insufficient free space']].
	Display setExtent: Display extent depth: pixelSize.

	DisplayScreen startUp!

----- Method: DummyUIManager>>request:initialAnswer: (in category 'ui requests') -----
request: queryString initialAnswer: defaultAnswer
	(ProvideAnswerNotification signal: queryString)
	ifNotNil: [:answer |
	    ^ answer == #default ifTrue: [defaultAnswer] ifFalse: [answer]].

	self error: 'No user response possible'!

----- Method: DummyUIManager>>requestPassword: (in category 'ui requests') -----
requestPassword: queryString
	^ self request: queryString initialAnswer: ''!

----- Method: DummyUIManager>>restoreDisplay (in category 'display') -----
restoreDisplay!

----- Method: DummyUIManager>>restoreDisplayAfter: (in category 'display') -----
restoreDisplayAfter: aBlock
	aBlock value.
	Sensor waitButton.!

StandardToolSet subclass: #CommandLineToolSet
	instanceVariableNames: ''
	classVariableNames: 'SaveSnapshotOnError'
	poolDictionaries: ''
	category: 'CommandLine-Tools'!

----- Method: CommandLineToolSet class>>debugContext:label:contents: (in category 'debugging') -----
debugContext: aContext label: aString contents: contents
	"We can't open a command line debugger, so just log the error and carry on."
	| s |
	s := FileStream stderr.
	s
		nextPutAll: self className;
		nextPutAll: ': ';
		nextPutAll: aString;
		cr;
		nextPutAll: contents;
		cr.
	(aContext stackOfSize: 20) do: [:ctx | ctx printOn: s. s cr].
	s flush.!

----- Method: CommandLineToolSet class>>debugError: (in category 'debugging') -----
debugError: anError 
	"Print out a sensible stack trace and bail"
	self saveSnapshotOnError ifTrue: [ Smalltalk saveAs: 'Debug-' , Smalltalk imageEntry name ].
	anError printVerboseOn: FileStream stderr.
	FileStream stderr flush.
	Smalltalk
		snapshot: false
		andQuit: true!

----- Method: CommandLineToolSet class>>debugSyntaxError: (in category 'debugging') -----
debugSyntaxError: anError 
	FileStream stderr
		 nextPutAll: '----- Syntax error -----' ;
		 cr ;
		 nextPutAll: anError errorCode ;
		 cr ;
		 nextPutAll: '----- Syntax error -----' ;
		 cr ;
		 flush.
	self debugError: anError!

----- Method: CommandLineToolSet class>>saveSnapshotOnError (in category 'preferences') -----
saveSnapshotOnError
	<preference: 'Save snapshot of image on failure'
	category: 'debug'
	description: 'If true, saves a snapshot of the failing image to the current directory.'
	type: #Boolean>
	^ SaveSnapshotOnError ifNil: [SaveSnapshotOnError := false].!

----- Method: CommandLineToolSet class>>saveSnapshotOnError: (in category 'preferences') -----
saveSnapshotOnError: aBoolean
	SaveSnapshotOnError := aBoolean.!

----- Method: CommandLineToolSet class>>unload (in category 'class initialization') -----
unload
	ToolSet unregister: self.!