"

 COPYRIGHT (c) 1992 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.

"

Object subclass:#Filename

	 instanceVariableNames:'nameString'

	 classVariableNames:'NextTempFilenameIndex'

	 poolDictionaries:''

	 category:'System-Support'!

Filename comment:'

COPYRIGHT (c) 1992 by Claus Gittinger

	     All Rights Reserved

'!

!Filename class methodsFor:'documentation'!

copyright

"

 COPYRIGHT (c) 1992 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.

"

!

version

"

"

!

documentation

"

    Filenames; originally added for ST-80 compatibility, is

    taking over functionality from other classes (FileDirectory).

    Instances of Filename do not nescessarily represent valid or existing

    files - i.e. it is possible (and useful) to have instances for non-existing

    files around. In other words: the name-string is not checked automatically

    for being correct or existing.

    Thus, it is possible to do queries such as:

	'/fee/foo/foe' asFilename exists     

	'/not_existing' asFilename isDirectory 

	'/foo/bar' asFilename isReadable 

    (all of the above examples will probably return false on your machine ;-).

    examples:

	'Makefile' asFilename readStream

	'newFile' asFilename writeStream

	Filename newTemporary writeStream

"

! !

!Filename class methodsFor:'instance creation'!

named:aString

    "return a filename for a directory named aString."

    ^ (self basicNew) setName:aString

    "

     Filename named:'/tmp/fooBar'

    "

!

currentDirectory

    "return a filename for the current directory"

    ^ self named:(FileDirectory currentDirectory pathName)

    "

     Filename currentDirectory 

    "

!

defaultDirectory

    "ST80 compatibility: same as currentDirectory"

    ^ self currentDirectory

    "

     Filename defaultDirectory 

    "

!

newTemporary

    "return a new unique filename - use this for temporary files.

     The filenames returned are '/tmp/stxtmp_xx_nn' where xx is our

     unix process id, and nn is a unique number, incremented with every

     call to this method."

    |pid nm|

    NextTempFilenameIndex isNil ifTrue:[

	NextTempFilenameIndex := 1.

    ].

    "

     the following has to be made OS independent ...

    "

    pid := OperatingSystem getProcessId printString.

    nm := '/tmp/stxtmp_' , pid , '_' , NextTempFilenameIndex printString.

    NextTempFilenameIndex := NextTempFilenameIndex + 1.

    ^ self named:nm

    "

     Filename newTemporary

     Filename newTemporary

    "

!

fromUser

    "show a box to enter a filename. Return a filename instance or

     nil (if cancel was pressed)."

    |name|

    name := FileSelectionBox requestFilename.

    name notNil ifTrue:[^ self named:name].

    ^ nil

    "

     Filename fromUser

    "

! !

!Filename class methodsFor:'queries'!

separator

    "return the file/directory separator.

     Usually, this is $/ for unix-like systems 

     and $\ for dos-like ones (there may be more in the future)."

     ^ OperatingSystem fileSeparator

     "

      Filename separator  

     "

!

parentDirectoryName 

    "return the name used for the parent directory.

     This is '..' for unix and dos-like systems. 

     (there may be more in the future."

     ^ OperatingSystem parentDirectoryName

     "

      Filename parentDirectoryName  

     "

!

isCaseSensitive

    "return true, if filenames are case sensitive.

     We ask the OS about this, to be independent here."

    ^ OperatingSystem caseSensitiveFilenames

!

defaultClass

    "ST-80 compatibility:

     in ST-80, different subclasses of FIlename are used for different

     OperatingSYstems; defaultClass is supposed to return an appropriate class.

     Since in ST/X, there is (currently) only one Filename class, return it here."

    ^ self

!

localNameStringFrom:aString

    "ST-80 compatibility.

     what does this do ? (used in FileNavigator-goody)"

    (aString startsWith:'/') ifTrue:[

	^ aString copyFrom:2

    ].

    ^ aString

!

volumes

    "ST-80 compatibility.

     what does this do ? (used in FileNavigator-goody)"

    ^ #('/')

! !

!Filename methodsFor:'instance creation'!

constructString:subname

    "taking the receiver as a directory name, construct a new

     filenames string for an entry within this directory (i.e. for a file

     or a subdirectory in that directory)."

    |sepString|

    sepString := self class separator asString.

    nameString = sepString ifTrue:[

	"I am the root"

	^ sepString  , subname

    ].

    ^ nameString , sepString , subname

    "

     '/tmp' asFilename constructString:'foo'   

     '/' asFilename constructString:'foo'         

     '/usr/tmp' asFilename constructString:'foo'

     '/foo/bar' asFilename constructString:'baz' 

    "

!

construct:subname

    "taking the receiver as a directory name, construct a new

     filename for an entry within this directory (i.e. for a file

     or a subdirectory in that directory)."

    ^ (self constructString:subname) asFilename

    "

     '/tmp' asFilename construct:'foo'    

     '/' asFilename construct:'foo'         

     '/usr/tmp' asFilename construct:'foo'

     '/foo/bar' asFilename construct:'baz' 

    "

! !

!Filename methodsFor:'misc'!

, aString

    "this allows filenames to understand how names are concatenated.

     Returns a string consisting of the receivers name, concatenated

     by aString. Notice this is NOT the same as construct:, which inserts

     a directory delimiter and returns a new fileName instance."

    ^ (nameString , aString asString)

    "

     'Makefile' asFilename , '.bak' 

     'Makefile' asFilename construct:'.bak' 

    "

! !

!Filename methodsFor:'comparing'!

hash

    "return an integer useful as a hash-key"

    ^ nameString hash

!

= aFilename

    "return true, if the argument represents the same filename"

    |str|

    self species == aFilename species ifTrue:[

	str := aFilename asString.

	self class isCaseSensitive ifTrue:[

	    ^ nameString = str

	].

	^ nameString sameAs:str

    ].

    ^ false

! !

!Filename methodsFor:'converting'!

asString

    "return the receiver converted to a string"

    ^ nameString

!

asFilename

    "return the receiver converted to a filename."

    "Thats pretty easy here :-)"

    ^ self

!

asAbsoluteFilename

    "return the receiver converted to a filename with

     an absolute pathname."

    ^ self pathName asFilename

!

makeLegalFilename 

    "convert the receveivers name to be a legal filename.

     The implementation may change in the future to be more

     OS specific."

    "

     actually, in Unix spaces are allowed - but it makes life

     so hard; therefore, replace them by underscores ...

    "

    nameString replaceAll:(Character space) by:$_.

    "

     need more - especially on SYS5.3 type systems, 

     we may want to contract the fileName to 14 characters.

    "

    ^ self

    "

     'hello world' asFilename makeLegalFilename 

    "

! !

!Filename methodsFor:'private accessing'!

setName:aString

    "set the filename"

    nameString := aString

! !

!Filename methodsFor:'queries'!

separator

    "return the directory-separator character (or string)"

    ^ self class separator

!

directoryName

    "return the directory name part of the file/directory.

     - thats the name of the directory where the file/dir represented by

       the receiver is contained in."

    ^ OperatingSystem directoryNameOf:nameString "/ (self pathName)

    "

     '/foo/bar/' asFilename directoryName    

     '/foo/bar' asFilename directoryName    

     '.' asFilename directoryName        

     '..' asFilename directoryName       

     '../..' asFilename directoryName     

    "

!

directory

    "return the directory name part of the file/directory.

     - thats a filename for the directory where the file/dir represented by

       the receiver is contained in."

    ^ self directoryName asFilename

    "