"
COPYRIGHT (c) 1994 by Claus Gittinger
All Rights Reserved
This software is furnished under a license and may be used
only in accordance with the terms of that license and with the
inclusion of the above copyright notice. This software may not
be provided or otherwise made available to, or used by, any
other person. No title to or ownership of the software is
hereby transferred.
"
TwoColumnTextView subclass:#DiffTextView
instanceVariableNames:'useColors showSeparators addedColor addedBgColor removedColor
removedBgColor changedColor changedBgColor changedSpacesOnlyColor
changedSpacesOnlyBgColor diffLineNumbers'
classVariableNames:'DiffCommandTemplate'
poolDictionaries:''
category:'Views-Text'
!
!DiffTextView class methodsFor:'documentation'!
copyright
"
COPYRIGHT (c) 1994 by Claus Gittinger
All Rights Reserved
This software is furnished under a license and may be used
only in accordance with the terms of that license and with the
inclusion of the above copyright notice. This software may not
be provided or otherwise made available to, or used by, any
other person. No title to or ownership of the software is
hereby transferred.
"
!
documentation
"
a view showing diff output (see unix manual pages)
in a user-friendly form.
The view is created and opened with:
d := DiffTextView openOn:text1 and:text2
or:
d := DiffTextView openOn:text1 label:l1
and:text2 label:l2
and it will show the differences side-by-side.
The colors mean:
red - removed
green - added
blue - changed
light-blue changed, but not really (i.e. spaces only)
For a real world application and use of this widget,
see the ChangesBrowsers `compare',
or the browsers 'compare with repository' functions.
Notice:
A diff command must be available on your system and found
along the PATH (you will see a warning on stderr, if there is no diff).
We use gnu-diff.
[see also:]
TextView EditTextView Diff3TextView
[author:]
Claus Gittinger
"
!
examples
"
[exBegin]
|text1 text2|
text1 := 'hello world
here is some difference
more text
this line has been removed
more text
more text
'.
text2 := 'hello world
where is the difference ?
more text
more text
more text
this line has been added
'.
DiffTextView openOn:text1 label:'text1'
and:text2 label:'text2'
[exEnd]
"
! !
!DiffTextView class methodsFor:'defaults'!
diffCommand
"return the diff-command (with argument placeHolders)"
DiffCommandTemplate isNil ifTrue:[
OperatingSystem isMSDOSlike ifTrue:[
(OperatingSystem canExecuteCommand:'diff') ifFalse:[
'DiffTextView [warning]: no diff command found' errorPrintCR.
^ nil
].
DiffCommandTemplate := 'diff %1 %2'
] ifFalse:[
DiffCommandTemplate := 'diff -b %1 %2'
]
].
^ DiffCommandTemplate
"Modified: / 30.1.1998 / 12:12:49 / cg"
!
diffCommandTemplate:aCommandTemplateString
"set the diff-command template"
OperatingSystem isMSDOSlike ifTrue:[
^ DiffCommandTemplate ? 'diff %1 %2'
].
^ DiffCommandTemplate ? 'diff -b %1 %2'
"Modified: / 30.1.1998 / 12:10:34 / cg"
"Created: / 30.1.1998 / 12:12:37 / cg"
! !
!DiffTextView methodsFor:'accessing'!
text1:t1 text2:t2
"set the two texts which are to be diffed;
execute DiffCommand and update the two textViews."
|tmpFile1 tmpFile2 name1 tmpName2 stream line
text1 text2 diffList pidString diffTemplate diffCmd|
text1 := t1 asStringCollection.
text2 := t2 asStringCollection.
diffTemplate := self class diffCommand.
diffTemplate isNil ifTrue:[
"/ self warn:'no diff command available'.
] ifFalse:[
"
save them texts in two temporary files ...
"
tmpFile1 := Filename newTemporary.
stream := tmpFile1 writeStream.
text1 do:[:line |
line notNil ifTrue:[
stream nextPutAll:line.
].
stream cr
].
stream close.
tmpFile2 := Filename newTemporary.
stream := tmpFile2 writeStream.
text2 do:[:line |
line notNil ifTrue:[
stream nextPutAll:line.
].
stream cr
].
stream close.
"
start diff on it ...
"
diffCmd := diffTemplate
bindWith:tmpFile1 asString
with:tmpFile2 asString.
stream := PipeStream readingFrom:diffCmd.
stream isNil ifTrue:[
stream := PipeStream readingFrom:('support' , Filename separator asString , diffCmd).
].
stream isNil ifTrue:[
self error:'cannot execute diff'.
text1 := text2 := nil.
] ifFalse:[
diffList := OrderedCollection new.
[stream atEnd] whileFalse:[
line := stream nextLine.
line notNil ifTrue:[diffList add:line]
].
stream close.
].
tmpFile1 delete.
tmpFile2 delete.
].
self updateListsFrom:text1 and:text2 diffs:diffList
"
|v|
v := HVScrollableView for:DiffTextView.
v scrolledView text1:('../libview/Color.st' asFilename readStream contents)
text2:('../libview/Color.st.old' asFilename readStream contents).
v open
"
"
|v t1 t2|
t1 := '
one
two
three
four
'.
t2 := '
one
two-a
two-b
three
three-b
four
'.
v := DiffTextView new.
v text1:t1 text2:t2.
v open
"
"Modified: / 5.5.1999 / 16:07:13 / cg"
! !
!DiffTextView methodsFor:'initialization'!
addNextPreviousButtons
super addNextPreviousButtons.
nextPrevButtonPanel beVisible.
!
initStyle
super initStyle.
showSeparators := false.
(useColors := device hasColors) ifTrue:[
addedColor := Color white.
addedBgColor := Color red.
removedColor := Color black.
removedBgColor := Color green.
changedColor := Color white.
changedBgColor := Color blue.
changedSpacesOnlyColor := Color white.
changedSpacesOnlyBgColor := Color blue lightened.
] ifFalse:[
showSeparators := true.
(useColors := device hasGreyscales) ifTrue:[
addedBgColor := removedBgColor := changedBgColor := Color grey:80.
addedColor := removedColor := changedColor := Color black.
] ifFalse:[
addedBgColor := removedBgColor := changedBgColor := Color black.
addedColor := removedColor := changedColor := Color white.
].
changedSpacesOnlyColor := Color white.
changedSpacesOnlyBgColor := Color black.
].
"Created: 16.11.1995 / 16:59:48 / cg"
"Modified: 14.6.1996 / 16:14:39 / cg"
! !
!DiffTextView methodsFor:'private'!
updateListsFrom:text1 and:text2 diffs:diffList
"given the two texts in text1 and text2, and the diff-output in diffList,
update my views contents"
|idx1 idx2 dIdx dEnd state s nr1 nr2 nr3 op entry c l1 l2 any delta
textView1 textView2 s1 s2 line1 line2|
diffLineNumbers := OrderedCollection new.
textView1 := textViews at:1.
textView2 := textViews at:2.
l1 := OrderedCollection new.
l2 := OrderedCollection new.
idx1 := 1.
idx2 := 1.
dIdx := 1.
dEnd := diffList size + 1.
state := #initial.
[dIdx <= dEnd] whileTrue:[
dIdx == dEnd ifTrue:[
"dummy cleanup entry"
entry := nil.
state := #initial.
] ifFalse:[
entry := diffList at:dIdx.
].
state == #initial ifTrue:[
"entry is of the form <nr> <op> <offs> [<offs2>]"
"
fill up to size difference from previous change
"
delta := l1 size - l2 size.
delta > 0 ifTrue:[
delta timesRepeat:[l2 add:nil]
] ifFalse:[
delta < 0 ifTrue:[
delta negated timesRepeat:[l1 add:nil]
]
].
"
except for the first chunk, add a separating line
"
l1 size ~~ 0 ifTrue:[
showSeparators ifTrue:[
l1 add:'--------'.
l2 add:'--------'.
]
].
"
in cleanup ?
"
entry isNil ifTrue:[
nr1 := text1 size + 1.
nr2 := text2 size + 1.
state := #finish.
] ifFalse:[
diffLineNumbers add:l1 size.
s := ReadStream on:entry.
nr1 := Integer readFrom:s.
s peek == $, ifTrue:[
s next.
Integer readFrom:s
].
op := s next.
nr2 := Integer readFrom:s.
s peek == $, ifTrue:[
s next.
nr3 := Integer readFrom:s
] ifFalse:[
nr3 := nil
].
op == $c ifTrue:[
state := #changed.
] ifFalse:[
(op == $a) ifTrue:[
state := #added.
] ifFalse:[
op == $d ifTrue:[
state := #deleted
] ifFalse:[
self halt:'unexpected diff entry'.
]
]
].
].
"/ nr1 print. ' ' print. op print. ' ' print. nr2 print. ' , ' print. nr3 printNL.
"
copy over unchanged lines
"
any := false.
[idx1 < nr1] whileTrue:[
"/ '< add:' print. idx1 printNL.
l1 add:(text1 at:idx1).
idx1 := idx1 + 1.
any := true.
].
[idx2 < nr2] whileTrue:[
"/ '> add:' print. idx2 printNL.
l2 add:(text2 at:idx2).
idx2 := idx2 + 1.
any := true.
].
state == #added ifTrue:[
l1 add:(text1 at:idx1).
idx1 := idx1 + 1.
].
state == #deleted ifTrue:[
l2 add:(text2 at:idx2).
idx2 := idx2 + 1.
].
"
add a separating line, except at end
"
any ifTrue:[
state ~~ #finish ifTrue:[
showSeparators ifTrue:[
l1 add:'--------'.
l2 add:'--------'.
]
]
].
] ifFalse:[
state == #changed ifTrue:[
line1 := line2 := nil.
(entry at:1) == $< ifTrue:[
useColors ifTrue:[
(l2 size >= idx1
and:[(s2 := line2 := l2 at:idx1) notNil
and:[(s2 asString withoutSeparators = (text1 at:idx1) withoutSeparators)
"/ or:[(s2 asString withoutSeparators withTabsExpanded = (text1 at:idx1) withoutSeparators withTabsExpanded)]
]]) ifTrue:[
line1 := Text string:(text1 at:idx1)
foregroundColor:changedSpacesOnlyColor
backgroundColor:changedSpacesOnlyBgColor.
line2 := Text string:line2 asString
foregroundColor:changedSpacesOnlyColor
backgroundColor:changedSpacesOnlyBgColor.
line1 string withoutTrailingSeparators = line2 string withoutTrailingSeparators ifTrue:[
line1 := line1 string.
line2 := line2 string.
].
l1 add:line1.
l2 at:idx1 put:line2.
] ifFalse:[
line1 := Text string:(text1 at:idx1)
foregroundColor:changedColor
backgroundColor:changedBgColor.
l1 add:line1.
]
] ifFalse:[
l1 add:(text1 at:idx1).
].
idx1 := idx1 + 1
] ifFalse:[
(entry at:1) == $> ifTrue:[
useColors ifTrue:[
(l1 size >= idx2
and:[(s1 := line1 := l1 at:idx2) notNil
and:[(s1 asString withoutSeparators = (text2 at:idx2) withoutSeparators)
"/ or:[(s1 asString withoutSeparators withTabsExpanded = (text2 at:idx2) withoutSeparators withTabsExpanded)]
]]) ifTrue:[
line2 := Text string:(text2 at:idx2)
foregroundColor:changedSpacesOnlyColor
backgroundColor:changedSpacesOnlyBgColor.
line1 := Text string:line1 asString
foregroundColor:changedSpacesOnlyColor
backgroundColor:changedSpacesOnlyBgColor.
line1 string withoutTrailingSeparators = line2 string withoutTrailingSeparators ifTrue:[
line1 := line1 string.
line2 := line2 string.
].
l2 add:line2.
l1 at:idx2 put:line1.
] ifFalse:[
line2 := Text string:(text2 at:idx2) foregroundColor:changedColor backgroundColor:changedBgColor.
l2 add:line2
]
] ifFalse:[
l2 add:(text2 at:idx2).
].
idx2 := idx2 + 1
] ifFalse:[
(entry at:1) == $- ifTrue:[
] ifFalse:[
state := #initial.
dIdx := dIdx - 1
]
]
].
] ifFalse:[
state == #added ifTrue:[
(entry at:1) == $> ifTrue:[
useColors ifTrue:[
l2 add:(Text string:(text2 at:idx2) foregroundColor:addedColor backgroundColor:addedBgColor )
] ifFalse:[
l2 add:(text2 at:idx2).
].
idx2 := idx2 + 1.
l1 add:nil
] ifFalse:[
state := #initial.
dIdx := dIdx - 1
]
] ifFalse:[
state == #deleted ifTrue:[
(entry at:1) == $< ifTrue:[
useColors ifTrue:[
l1 add:(Text string:(text1 at:idx1) foregroundColor:removedColor backgroundColor:removedBgColor ).
] ifFalse:[
l1 add:(text1 at:idx1).
].
idx1 := idx1 + 1.
l2 add:nil
] ifFalse:[
state := #initial.
dIdx := dIdx - 1
]
]
"must be in finish otherwise"
]
]
].
dIdx := dIdx + 1
].
[l1 size < l2 size] whileTrue:[
l1 add:''.
].
[l2 size < l1 size] whileTrue:[
l2 add:''.
].
"/ fixup - diff -b is ignoring lines which differ in leading space only ...
1 to:l1 size do:[:idx |
|line1 line2|
line1 := l1 at:idx.
line2 := l2 at:idx.
(line1 notNil and:[line1 hasChangeOfEmphasis not]) ifTrue:[
(line2 notNil and:[line2 hasChangeOfEmphasis not]) ifTrue:[
line1 withTabsExpanded withoutTrailingSeparators
~= line2 withTabsExpanded withoutTrailingSeparators
ifTrue:[
line1 := Text string:line1
foregroundColor:changedSpacesOnlyColor
backgroundColor:changedSpacesOnlyBgColor.
line2 := Text string:line2
foregroundColor:changedSpacesOnlyColor
backgroundColor:changedSpacesOnlyBgColor.
l1 at:idx put:line1.
l2 at:idx put:line2.
]
]
]
].
textView1 list:l1.
textView2 list:l2
"Modified: / 13.7.1999 / 14:12:11 / cg"
! !
!DiffTextView class methodsFor:'documentation'!
version
^ '$Header: /cvs/stx/stx/libtool/DiffTextView.st,v 1.28 1999-07-16 00:03:41 cg Exp $'
! !