zsh_completion: complete merge tools for -t/--tool Differential Revision: https://phab.mercurial-scm.org/D4362

shelve: add an "internal" extra Keeping shelve changeset around increase the risk of collision with normal changesets. To prevent such collision and help with overall clarity, we add an 'internal' key in extra that mark the changeset as created by "shelve". Node changes in tests are expected.

shelve: write metadata file on the fly if they are missing Keeping an explicit reference to the shelve node in order to reuse it directly if the unshelved is repeated (eg: unshelve --keep).

shelve: look for shelved node in the repository before unbundling This prepares the version of shelve that would not strip the shelved node from the repository. If we have the node information, search for it in the repository and only fallback on unbundling if it is missing. To be able to find such nodes, we operate on an unfiltered repository.

shelve: handle shelved node on unfiltered repository To build a version of shelve that use hiding instead of stripping, we need shelve to be able to find these revisions. This it does not hurt the bundle version, so we introduce the necessary code in the relevant place.

shelve: store shelved node in a new data file It is useful for a version of shelve not based on bundle and strip. Having more data does not hurt the bundle based case so we introduce it in all cases before doing more rework. We also keep storing the patch using another method. note: We could have this metadata file list all the file involved in the shelve and use that for cleanup. This would be more future proof than having a hard-coded list of file to purge. However, this is an adventure for another series.

templatekw: add {path} keyword to host documentation It's hidden since I'm not sure if filectx templates can be a thing. The plan is to add {status}, {size}, etc., which are usable within {files % ...} context.

status: rename {copy} to {source} for compatibility with {file_copies} (BC) .. bc:: ``{copy}`` in status command template is renamed to ``{source}``.

formatter: rename {abspath}/{file} to {path}, and drop relative {path} (BC) Note that {path} in status is either relative-to-cwd or repository-absolute depending on the command argument and config knob, which can't be reproduced by using the {path|relpath} filter. The default template is updated to always use a relative path. .. bc:: ``{abspath}`` and ``{file}`` in generic templates are renamed to ``{path}``. Any ``{path}`` is a repository-absolute path. Use ``{path|relpath}`` to convert it to a filesystem path.

templatekw: alias {name} of file copies dict to {path} For the same reason as the previous patch. We might want some hack to support {source.path}, {source.rev}, etc., but that's a different issue.