Haskell: makeAbsolute: Convert path to absolute path

System.Directory module provides makeAbsolute function, which convert path to absolute path. If the path is relative to current directory then t he current directory is prepended and then the combined result is normalised. If the path is already absolute, the path is simply normalised.

This operation may fail with following errors.

Error	Description
HardwareFault	A physical I/O error has occurred.
isDoesNotExistError or NoSuchThing	There is no path referring to the working directory.
isPermissionError or PermissionDenied	The process has insufficient privileges to perform the operation.
ResourceExhausted	Insufficient resources are available to perform the operation.
UnsupportedOperation	The operating system has no notion of current working directory.

Following is the signature of normalize function. ‘normalise’ function is available at System.FilePath module.

Prelude System.FilePath> :t normalise

normalise :: FilePath -> FilePath

Following are the rules for normalize function , which normalizes a file path.

Posix:   normalise "/file/\\test////" == "/file/\\test/"
Posix:   normalise "/file/./test" == "/file/test"
Posix:   normalise "/test/file/../bob/fred/" == "/test/file/../bob/fred/"
Posix:   normalise "../bob/fred/" == "../bob/fred/"
Posix:   normalise "./bob/fred/" == "bob/fred/"
Windows: normalise "c:\\file/bob\\" == "C:\\file\\bob\\"
Windows: normalise "c:\\" == "C:\\"
Windows: normalise "C:.\\" == "C:"
Windows: normalise "\\\\server\\test" == "\\\\server\\test"
Windows: normalise "//server/test" == "\\\\server\\test"
Windows: normalise "c:/file" == "C:\\file"
Windows: normalise "/file" == "\\file"
Windows: normalise "\\" == "\\"
Windows: normalise "/./" == "\\"
         normalise "." == "."
Posix:   normalise "./" == "./"
Posix:   normalise "./." == "./"
Posix:   normalise "/./" == "/"
Posix:   normalise "/" == "/"
Posix:   normalise "bob/fred/." == "bob/fred/"
Posix:   normalise "//home" == "/home"

Prelude System.Directory> makeAbsolute "."
"/Users/harikrishna_gurram"
Prelude System.Directory> 
Prelude System.Directory> makeAbsolute ".."
"/Users/harikrishna_gurram/.."
Prelude System.Directory> 
Prelude System.Directory> makeAbsolute ".//Shared"
"/Users/harikrishna_gurram/Shared"
Prelude System.Directory> 
Prelude System.Directory> makeAbsolute ".\\Shared"
"/Users/harikrishna_gurram/.\\Shared"
Prelude System.Directory> 
Prelude System.Directory> makeAbsolute ".////Shared"
"/Users/harikrishna_gurram/Shared"
Prelude System.Directory> 
Prelude System.Directory> makeAbsolute ".////////Shared"
"/Users/harikrishna_gurram/Shared"
Prelude System.Directory> 
Prelude System.Directory> makeAbsolute ".///Shared"
"/Users/harikrishna_gurram/Shared"
Prelude System.Directory> 
Prelude System.Directory> makeAbsolute "/.///Shared"
"/Shared"
Prelude System.Directory> makeAbsolute "//.///Shared"
"/Shared"
Prelude System.Directory> makeAbsolute "///.///Shared"
"/Shared"
Prelude System.Directory>

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