upstream/mercurial-mirror Files · tests/readlink.py

revset: lookup descendents for negative arguments to ancestor operator...

revset: lookup descendents for negative arguments to ancestor operator Negative offsets to the `~` operator now search for descendents. The search is aborted when a node has more than one child as we do not have a definition for 'nth child'. Optionally we can introduce such a notion and take the nth child ordered by rev number. The current revset language does provides a short operator for ancestor lookup but not for descendents. This gives user a simple revset to move to the previous changeset, e.g. `hg up '.~1'` but not to the 'next' changeset. With this change userse can now use `.~-1` as a shortcut to move to the next changeset. This fits better into allowing users to specify revisions via revsets and avoiding the need for special `hg next` and `hg prev` operations. The alternative to negative offsets is adding a new operator. We do not have many operators in ascii left that do not require bash escaping (',', '_', and '/' come to mind). If we decide that we should add a more convenient short operator such as ('/', e.g. './1') we can later add it and allow ascendents lookup via negative numbers.

Pulkit Goyal - - Load All Authors

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      #!/usr/bin/env python

      from __future__ import absolute_import, print_function

      import errno

      import os

      import sys

      for f in sys.argv[1:]:

          try:

              print(f, '->', os.readlink(f))

          except OSError as err:

              if err.errno != errno.EINVAL:

                  raise

              print(f, '->', f, 'not a symlink')

      sys.exit(0)

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				#!/usr/bin/env python

				from __future__ import absolute_import, print_function

				import errno
				import os
				import sys

				for f in sys.argv[1:]:
				try:
				print(f, '->', os.readlink(f))
				except OSError as err:
				if err.errno != errno.EINVAL:
				raise
				print(f, '->', f, 'not a symlink')

				sys.exit(0)