For performance reasons the first thing you check before doing
anything else should be:

 if path[0] != "\\": return path


On Fri, Aug 6, 2010 at 2:01 AM, tbnorth <email address hidden> wrote:
> Edward, not sure if you're following this thread, but the fix turned out
> to be entangled with a lot of @<file> stuff, so I don't want to push it
> without your inspection.
>
> Repeating the basic problem: for an @<file> node there is some parent
> path in effect at the point where you reach the node, based on the
> location of the .leo file and any relevant @path directives.  For
> determination of the full path to the target file, the @<file> node can
> either extend the parent path with a relative path (simplest case, just
> the filename), or discard the parent path with an absolute path of its
> own.  The problem arises when the @<file> introduces a Windows drive
> specific \absolute\path without specifying the drive.  In that case the
> drive should come from the original parent path.
>
> I think the diff below does that ok.  It might do it in more places than
> was needed to fix the original problem, but I don't think it does it in
> any places where it shouldn't.
>
> Also, I think the same issue would affect the scanning of @path
> directives, this diff doesn't address that, although the
> fix_windows_absolute() method it introduces could probably be used for
> that application also.  Here's the diff:
>
> === modified file 'leo/core/leoAtFile.py'
> --- leo/core/leoAtFile.py       2010-08-03 22:26:10 +0000
> +++ leo/core/leoAtFile.py       2010-08-05 22:24:42 +0000
> @@ -688,6 +688,8 @@
>         else:
>             fileName = None
>
> +        fileName = g.fix_windows_absolute(self.c, root, fileName)
> +
>         return fileName
>     #@+node:ekr.20100224050618.11547: *5* at.isFileLike
>     def isFileLike (self,s):
> @@ -2815,7 +2817,10 @@
>                 at.targetFileName = root.atFileNodeName()
>         else:
>             at.targetFileName = root.atFileNodeName()
> +
> +        at.targetFileName = g.fix_windows_absolute(at.c, root, at.targetFileName)
>         #@-<< set at.targetFileName >>
> +
>         at.initWriteIvars(root,at.targetFileName,
>             nosentinels = nosentinels, thinFile = thinFile,
>             scriptWrite = scriptWrite, toString = toString)
> @@ -5166,7 +5171,9 @@
>         else:
>             fn = p.anyAtFileNodeName()
>         if fn:
> +            fn = g.fix_windows_absolute(c, p, fn)
>             path = g.os_path_finalize_join(path,fn)
> +
>         else:
>             g.trace('can not happen: not an @<file> node:',g.callers(4))
>             for p2 in p.self_and_parents():
>
> === modified file 'leo/core/leoCommands.py'
> --- leo/core/leoCommands.py     2010-08-01 17:16:51 +0000
> +++ leo/core/leoCommands.py     2010-08-05 22:59:13 +0000
> @@ -559,6 +559,7 @@
>             if name: break
>
>         if name:
> +            name = g.fix_windows_absolute(self, p, name)
>             name = g.os_path_finalize_join(path,name)
>         return name
>     #@+node:ekr.20091211111443.6265: *3* c.doBatchOperations & helpers
>
> === modified file 'leo/core/leoGlobals.py'
> --- leo/core/leoGlobals.py      2010-07-31 12:00:58 +0000
> +++ leo/core/leoGlobals.py      2010-08-05 22:52:47 +0000
> @@ -936,6 +936,9 @@
>     if name:
>         theDir = g.os_path_dirname(name)
>         if theDir and g.os_path_isabs(theDir):
> +
> +            theDir = g.fix_windows_absolute(c,p,theDir)
> +
>             if g.os_path_exists(theDir):
>                 default_dir = theDir
>             else:
> @@ -3603,6 +3606,38 @@
>
>     # Yes, this is correct.  All os_path_x functions return Unicode strings.
>     return g.toUnicode(path)
> +#@+node:tbrown.20100805110001.18803: *3* fix_windows_absolute
> +def fix_windows_absolute(c, p, path):
> +    """According to os.path.isabs(), in Windows, "\\foo\\bar.leo" is
> +    an absolute path, but resolving it depends of the python process's
> +    current directory.  See http://bugs.python.org/issue1669539.  So in
> +    cases where we seem to be dealing with an "absolute" path of this
> +    kind in Windows, we need to prepend the drive letter based on any
> +    relevant @path directives and the location of the .leo file.
> +    """
> +
> +    import platform
> +
> +    if not path or platform.system() != 'Windows' or path[0] != "\\":
> +        return path
> +
> +    if len(path) > 1 and path[1] == "\\":
> +        return path  # don't mess with "\\server\share" style paths
> +
> +    # need drive letter from parent path
> +    parent_path = c.getNodePath(p)
> +
> +    if not 'A' <= parent_path[0].upper() <= 'Z':
> +        return path  # because this state is not anticipated / understood
> +
> +    # this should take into account any @path directives, and, in the
> +    # absence of any absolute path components, the starting point defined
> +    # by the location of the .leo file
> +    drive_letter = parent_path[:2]
> +
> +    g.es(path + " -> " + drive_letter + path)
> +
> +    return drive_letter + path  # "E:" + "\some\thing"
>  #@+node:ekr.20031218072017.3151: ** Scanning... (leoGlobals.py)
>  #@+node:ekr.20031218072017.3156: *3* scanError
>  # It is dubious to bump the Tangle error count here, but it really doesn't hurt.
>
> --
> unable to describe root directory on thumb drive
> https://bugs.launchpad.net/bugs/613153
> You received this bug notification because you are a member of The Leo
> editor team, which is subscribed to leo-editor.
>
> Status in Leo: a programmer's editor and more: New
>
> Bug description:
> Environment:
> -Running WinXP
> -Launching Leo with C:\ as the root directory
> -Opening Leo file stored on portable thumb drive (drive letters may be different depending on which machine it's connected to)
>
> Leo file is here:
> E:\Documents\Leo Outlines\ (drive letter E:\ is variable)
>
> Wanting to create @thin node to save file to here:
> E:\Documents\Web Site\
>
> Tried:
> @thin E:\Documents\Web Site\
> This works but only on machines that assign E: to the thumb drive)
>
> @thin \Documents\Web Site\index.html
> This produces the following error:
> errors writing: C:\Documents\Web Site\index.html
> path does not exist: C:\Documents\Web Site
>
> @thin .\Documents\Web Site\index.html
> This produces the following error:
> errors writing: E:\Documents\Leo Outlines\Documents\Web Site\index.html
> path does not exist: E:\Documents\Leo Outlines\Documents\Web Site
>
> @thin ..\Documents\Web Site\index.html
> This produces the following error:
> errors writing: E:\Documents\Documents\Web Site\index.html
> path does not exist: E:\Documents\Documents\Web Site
>
> I've tried up to three dots (same result as above).
>
> I need to know how to specify a correct path when the root directory drive letter is variable.
>
>
>



-- 
Ville M. Vainio @@ Forum Nokia