On 30/04/19 9:04 AM, Peter J. Holzer wrote:
On 2019-04-29 20:12:28 -0000, Grant Edwards wrote:
On 2019-04-29, DL Neil <pythonl...@danceswithmice.info> wrote:
Are you aware of a library/utility which will generate and maintain the
file names of multiple generations of a file?
Well, the FILES-11 filesystem on VAX/VMS did that automatically, but
that's probably not too helpful. Though I guess Python is actually
available for OpenVMS, and the porting of OpenVMS to AMD64 (aka
x86-64) is progressing: https://www.vmssoftware.com/updates_port.html
Until this is finished you could use something like this:
#!/usr/bin/python3
import os
def open11(file, mode, **kwargs):
if "w" in mode:
try:
oldfile = os.readlink(file)
basename, version = oldfile.split(";")
except FileNotFoundError:
basename = os.path.basename(file)
version = 0
newfile = basename + ";" + str(int(version) + 1)
os.unlink(file)
os.symlink(newfile, file)
return open(file, mode, **kwargs)
if __name__ == "__main__":
with open11("foo", "w") as f:
f.write("test1")
with open11("foo", "w") as f:
f.write("test2")
with open11("foo", "w") as f:
f.write("test3")
:-)
(WARNING: I haven't really tested this)
Didn't think of the concept of using links!
As Eli showed, with a bit of refinement, we can make something from here...
Thanks!
--
Regards =dn
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