Namespace std.filesystem

Using libc

#Import "native/filesystem.h"
#Import "native/filesystem.cpp"

Extern

#rem monkeydoc Gets application directory.

@return The directory containing the application executable.

#end
Function AppDir:String()="bbFileSystem::appDir"

#rem monkeydoc Gets the application file path.

@return The path of the application executable.

#end
Function AppPath:String()="bbFileSystem::appPath"

#rem monkeydoc Gets application command line arguments.

The first argument is always the application name.

@return The application command line arguments.

#end
Function AppArgs:String[]()="bbFileSystem::appArgs"

#rem monkeydoc Copies a file.

Copies a file from `srcPath` to `dstPath`, overwriting `dstpath` if it alreay exits.

Returns true if successful.

@return True if the file was successfully copied.

#end
Function CopyFile:Bool( srcPath:String,dstPath:String )="bbFileSystem::copyFile"

Private

Function FixRoot:String( path:String )
	
	Local root:=ExtractRootDir( path )
	
	If Not root.EndsWith( "::" ) Return path
	
	path=path.Slice( root.Length )
	
	Select root
	Case "asset::" return AssetsDir()+path
	Case "desktop::" Return DesktopDir()+path
	Case "home::" Return HomeDir()+path
	End
	
	Return ""
End

Function FixFilePath:String( path:String )
	
	Return FixRoot( StripSlashes( path ) )
End

Public

#rem monkeydoc FileType enumeration.

| FileType		| Description
|:--------------|:-----------
| `None`		| File does not exist.
| `File`		| File is a normal file.
| `Directory`	| File is a directory.
| `Unknown`		| File is of unknown type.

#end
Enum FileType
	None=0
	File=1
	Directory=2
	Unknown=3
End

'For backward compatibility - don't use!
'
#rem monkeydoc @hidden
#end
Const FILETYPE_NONE:=FileType.None

#rem monkeydoc @hidden
#end
Const FILETYPE_FILE:=FileType.File

#rem monkeydoc @hidden
#end
Const FILETYPE_DIR:=FileType.Directory

#rem monkeydoc @hidden
#end
Const FILETYPE_UNKNOWN:=FileType.Unknown

#rem monkeydoc Gets an environment variable.

Returns the value of the given environment variable, or `defaultValue` if none was found.

#end
Function GetEnv:String( name:String,defaultValue:String="" )
	
	Local p:=getenv( name )
	
	If p Return String.FromCString( p )
	
	Return defaultValue
End

#rem monkeydoc Sets an environment variable.

Sets the value of a given environment variable.

#end
Function SetEnv( name:String,value:String )
	
	setenv( name,value,1 )
End

#rem monkeydoc Gets the filesystem directory of the app's assets directory.

Note that only the desktop and web targets have an assets directory. Other targets will return an empty string.

@return The directory app assets are stored in.

#end
Function AssetsDir:String()
#If __TARGET__="macos"
	Return AppDir()+"../Resources/"
#Else If __DESKTOP_TARGET__ Or __WEB_TARGET__
	Return AppDir()+"assets/"
#Else
	Return ""
#Endif
End

#rem monkeydoc Gets the filesystem directory of the user's desktop directory.

Note that only the desktop targets have a desktop directory. Other targets will return an empty string.

@return The desktop directory.

#end
Function DesktopDir:String()
#If __TARGET__="windows"
	Return GetEnv( "USERPROFILE" )+"/Desktop/"
#Else If __DESKTOP_TARGET__
 	Return GetEnv( "HOME" )+"/Desktop/"
 #Else
 	Return ""
#Endif
End

#rem monkeydoc Gets the filesystem directory of the user's home directory.

Note that only the desktop targets have a home directory. Other targets will return an empty string.

@return The home directory.

#end
Function HomeDir:String()
#If __DESKTOP_TARGET__
	Return GetEnv( "USERPROFILE" )+"/"
#Else if __DESKTOP_TARGET__
	Return GetEnv( "HOME" )+"/"+
#Else
	Return ""
#Endif
End

#rem monkeydoc Extracts the root directory from a file system path.

A root directory is a directory path that:

* Starts with '//' or '/', or...

* Starts with 'blah:/', 'blah://' or 'blah::'.

@param path The filesystem path.

@return The root directory of `path`, or an empty string if `path` is not an absolute path.
 
#end
Function ExtractRootDir:String( path:String )

	If path.StartsWith( "//" ) Return "//"
	
	Local i:=path.Find( "/" )
	If i=0 Return "/"
	
	If i=-1 i=path.Length
	
	Local j:=path.Find( "://" )
	If j>0 And j<i Return path.Slice( 0,j+3 )
	
	j=path.Find( ":/" )
	If j>0 And j<i Return path.Slice( 0,j+2 )
	
	j=path.Find( "::" )
	If j>0 And j<i Return path.Slice( 0,j+2 )
	
	Return ""
	
End

#rem monkeydoc Checks if a path is a root directory.

@param path The filesystem path to check.

@return True if `path` is a root directory path.

#end
Function IsRootDir:Bool( path:String )

	If path="//" Return True
	
	If path="/" Return True
	
	Local i:=path.Find( "/" )
	If i=-1 i=path.Length
	
	Local j:=path.Find( "://" )
	If j>0 And j<i Return j+3=path.Length
	
	j=path.Find( ":/" )
	If j>0 And j<i Return j+2=path.Length
	
	j=path.Find( "::" )
	If j>0 And j<i Return j+2=path.Length
	
	Return False
End

#rem monkeydoc Gets the process current directory.

@return The current directory for the running process.

#end
Function CurrentDir:String()
	
	Local buf:=New char_t[PATH_MAX]
	
	getcwd( buf.Data,PATH_MAX )
	
	Local path:=String.FromCString( buf.Data )
	
#If __TARGET__="windows"	
	path=path.Replace( "\","/" )
#Endif

	If path.EndsWith( "/" ) Return path

	Return path+"/"
End

#rem monkeydoc Converts a path to a real path.

If `path` is a relative path, it is first converted into an absolute path by prefixing the current directory.

Then, any internal './' or '../' references in the path are collapsed.

@param path The filesystem path.

@return An absolute path with any './', '../' references collapsed.

#end
Function RealPath:String( path:String )
	
	path=FixRoot( path )
	
	Local buf:=New char_t[PATH_MAX]
	
	If Not libc.realpath( path,buf.Data ) Return ""
	
	Local rpath:=String.FromCString( buf.Data )
	
#If __TARGET__="windows"
	rpath=rpath.Replace( "\","/" )
#Endif

	Return rpath
End

#rem monkeydoc Strips any trailing slashes from a filesystem path.

This function will not strip slashes from a root directory path.

@param path The filesystem path.

@return The path stripped of trailing slashes.

#end
Function StripSlashes:String( path:String )
	
	path=path.Replace( "\","/" )
	
	If Not path.EndsWith( "/" ) Return path
	
	Local root:=ExtractRootDir( path )
	
	Repeat
	
		If path=root Return path

		path=path.Slice( 0,-1 )
		
	Until Not path.EndsWith( "/" )
	
	Return path
End

#rem monkeydoc Extracts the directory component from a filesystem path.

If `path` is a root directory it is returned without modification.

If `path` does not contain a directory component, an empty string is returned.

@param path The filesystem path.

@return The directory component of `path`.

#end
Function ExtractDir:String( path:String )

	path=StripSlashes( path )

	If IsRootDir( path ) Return path
	
	Local i:=path.FindLast( "/" )
	If i>=0 Return path.Slice( 0,i+1 )
	
	i=path.Find( "::" )
	If i>=0 Return path.Slice( 0,i+2 )
	
	Return ""
End

#rem monkeydoc Strips the directory component from a filesystem path.

If `path` is a root directory an empty string is returned.

If `path` does not contain a directory component, `path` is returned without modification.

@param path The filesystem path.

@return The path with the directory component stripped.

#end
Function StripDir:String( path:String )

	path=StripSlashes( path )

	If IsRootDir( path ) Return ""

	Local i:=path.FindLast( "/" )
	If i>=0 Return path.Slice( i+1 )
	
	i=path.Find( "::" )
	If i>=0 Return path.Slice( i+2 )
	
	Return path
End

#rem monkeydoc Extracts the extension component from a filesystem path.

@param path The filesystem path.

@return The extension component of `path` including  the '.' if any.

#end
Function ExtractExt:String( path:String )

	Local i:=path.FindLast( "." )
	If i=-1 Return ""
	
	Local j:=path.Find( "/",i+1 )
	If j=-1 Return path.Slice( i )
	
	Return ""
End

#rem monkeydoc Strips the extension component from a filesystem path.

@param path The filesystem path.

@return The path with the extension stripped.

#end
Function StripExt:String( path:String )

	Local i:=path.FindLast( "." )
	If i=-1 Return path
	
	Local j:=path.Find( "/",i+1 )
	If j=-1 Return path.Slice( 0,i )
	
	Return path
End

#rem monkeydoc Gets the type of the file at a filesystem path.

@param path The filesystem path.

@return The file type of the file at `path`, one of: FileType.None, FileType.File or FileType.Directory.

#end
Function GetFileType:FileType( path:String )
	
	path=FixFilePath( path )

	Local st:stat_t
	If stat( path,Varptr st )<0 Return FileType.None
	
	Select st.st_mode & S_IFMT
	Case S_IFREG Return FileType.File
	Case S_IFDIR Return FileType.Directory
	End
	
	Return FileType.Unknown
End

#rem monkeydoc Gets the time a file was most recently modified.

@param path The filesystem path.

@return The time the file at `path` was most recently modified.

#end
Function GetFileTime:Long( path:String )
	
	path=FixFilePath( path )

	Local st:stat_t
	If stat( path,Varptr st )<0 Return 0
	
	Return libc.tolong( st.st_mtime )
End

#rem monkeydoc Gets the size of the file at a filesystem path.

@param path The filesystem path.

@return The size file at `path` in bytes.

#end
Function GetFileSize:Long( path:String )

	path=FixFilePath( path )

	Local st:stat_t
	If stat( path,Varptr st )<0 Return 0

	return st.st_size
End

#rem monkeydoc Changes the process current directory.

@param path The filesystem path of the directory to make current.

#end
Function ChangeDir( path:String )

	path=FixFilePath( path )

	chdir( path )
End

#rem monkeydoc Loads a directory.

Loads the contents of directory into an array.

Does not return any '.' or '..' entries in a directory.

@param path The filesystem path of the directory to load.

@return An array containing all filenames in the `path`, excluding '.' and '..' entries.

#end
Function LoadDir:String[]( path:String )
	
	path=FixFilePath( path )

	Local dir:=opendir( path )
	If Not dir Return Null
	
	Local files:=New StringStack
	
	Repeat
		Local ent:=readdir( dir )
		If Not ent Exit
		
		Local file:=String.FromCString( ent[0].d_name )
		If file="." Or file=".." Continue
		
		files.Push( file )
	Forever
	
	closedir( dir )
	
	Return files.ToArray()
End

#rem monkeydoc Creates a file at a filesystem path.

Any existing file at the path will be overwritten.

Returns true if successful.

@param path The filesystem path of the file file to create.

@param createDir If true, also creates the file directory if necessary.

@return True if a file at the given path was created.

#end
Function CreateFile:Bool( path:String,createDir:Bool=True )
	
	path=FixFilePath( path )

	If createDir And Not CreateDir( ExtractDir( path ),True ) Return False
	
	Local f:=fopen( path,"wb" )
	If Not f Return False
	
	fclose( f )
	Return True
End

#rem monkeydoc Creates a directory at a filesystem path.

@param path The filesystem path of the directory to create.

@param recursive If true, any required parent directories are also created.

@param clean If true, any existing directory at `dir` is first deleted.

@return True if a directory at `path` was successfully created or already existed.

#end
Function CreateDir:Bool( dir:String,recursive:Bool=True,clean:Bool=False )
	
	dir=FixFilePath( dir )
	
	If recursive
	
		Local parent:=ExtractDir( dir )
	
		If parent And Not IsRootDir( parent )
		
			Select GetFileType( parent )
			Case FileType.None
				If Not CreateDir( parent,True,False ) Return False
			Case FileType.File
				Return False
			End
			
		Endif
		
	Endif
	
	If clean And Not DeleteDir( dir,True ) Return False
	
	mkdir( dir,$1ff )
	
	Return GetFileType( dir )=FileType.Directory
End

#rem monkeydoc Deletes a file at a filesystem path.

Returns true if successful.

@param path The filesystem path.

@return True if the file was successfully deleted.

#end
Function DeleteFile:Bool( path:String )
	
	path=FixFilePath( path )

	remove( path )
	
	Return GetFileType( path )=FileType.None
End

#rem monkeydoc Deletes a directory at a filesystem path.

If `recursive` is true, all subdirectories are also deleted.

Returns true if successful.

@param path The filesystem path.

@param recursive True to delete subdirectories too.

@return True if the directory was successfully deleted or never existed.

#end
Function DeleteDir:Bool( dir:String,recursive:Bool=False )
	
	dir=FixFilePath( dir )

	If GetFileType( dir )=FileType.Directory

		If recursive
			For Local f:=Eachin LoadDir( dir )
				Local p:=dir+"/"+f
				Select GetFileType( p )
				Case FileType.File
					If Not DeleteFile( p ) Return False
				Case FileType.Directory
					If Not DeleteDir( p,True ) Return false
				End
			Next
		Endif
		
		rmdir( dir )
	Endif
	
	Return GetFileType( dir )=FileType.None
End


#rem monkeydoc Copies a directory.

Copies a directory from `srcDir` to `dstDir`.

If `recursive` is true, all subdirectories are also copied.

Returns true if successful.

@param srcDir Source directory.

@param dstDir Destination directory.

@param recursive Recursive flag.

@return True if successful.

#end
Function CopyDir:Bool( srcDir:String,dstDir:String,recursive:Bool=True )
	
	srcDir=FixFilePath( srcDir )
	
	dstDir=FixFilePath( dstDir )

	If GetFileType( srcDir )<>FileType.Directory Return False
	
	If GetFileType( dstDir )<>FileType.Directory And Not CreateDir( dstDir,True ) Return False
	
	For Local f:=Eachin LoadDir( srcDir )
	
		Local src:=srcDir+"/"+f
		Local dst:=dstDir+"/"+f
		
		Select GetFileType( src )
		Case FileType.File
			If Not CopyFile( src,dst ) Return False
		Case FileType.Directory
			If recursive And Not CopyDir( src,dst ) Return False
		End
		
	Next
	
	Return True

End