[Pythonmac-SIG] Carbon.File and resolving aliases

[Paul Donovan]

On 15 Jan 2004, at 22:48, Jack Jansen wrote:
> If you write the routine I'd be interested in adding it to the 
> macostools module.
>
Ok, it took a while (not a lot of spare time), but I've got something 
I'm fairly happy with. I've not been doing either Python or Mac 
programming for very long, so it might not be the best, but here it is:

import Carbon.File
import os.path
import string

def ResolveFinderAliases(path):
	"""Returns a version of the supplied path with all Finder aliases
	converted to their real locations
	"""
	if path is "":
		return path

	# We need to keep testing a full path until all the aliases have
	# been removed
	finished = 0
	while not finished:
		comps = string.split(path,'/')
		for i,c in enumerate(comps):
			if c == '':
				comps[i] = '/'
		result = ""
		for i, comp in enumerate(comps):
			# Add the next component of the path
			result = os.path.join(result,comp)

			# Check for an alias
			fss = Carbon.File.FSSpec(result)
			fss, isFolder, aliased = Carbon.File.ResolveAliasFile(fss,0)

			if aliased:
				# Get where the alias points to
				fsr = Carbon.File.FSRef(fss)
				path = fsr.FSRefMakePath()
				for j in range(i+1,len(comps)):
					path = os.path.join(path,comps[j])
				# Start the process again - the target of this alias
				# might have an alias further up the path.
				break
			elif i == len(comps)-1:
				# Reached the last component without finding
				# an alias - finished.
				finished = 1
	return result

One flaw I am aware of is that handling of errors from the Carbon.File 
functions is non-existent.

Cheers,

Paul

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