errors: return more detailed errors when failing to parse or apply patch This patch adds subclasses of `PatchError` so we can distinguish between failure to parse a patch from failure to apply it. It updates the callers to raise either `InputError` or `StateError` depending on which type of error occurred. Differential Revision: https://phab.mercurial-scm.org/D11824

extensions: add a default "*" suboptions prefix This is similar to what we do in other section (e.g. `paths`) and allow to change the behavior for all extensions. Sub options on individual extensions overwrite the default settings. Differential Revision: https://phab.mercurial-scm.org/D11823

extension: add a `required` suboption to enforce the use of an extensions If `required` is set, failing to load an extensions will abort. See the test and documentation for details. Differential Revision: https://phab.mercurial-scm.org/D11822

extensions: highlight the name of the faulty extensions in the error message This make it easier to understand the message when the extensions name is common. Differential Revision: https://phab.mercurial-scm.org/D11821

extensions: refactor handling of loading error make it reusable We will need this in the next patch. Differential Revision: https://phab.mercurial-scm.org/D11820

extensions: ignore "sub-options" when looking for extensions config suboptions are separated by ":" (see the path one for example). So we dont want to confuse these config with actual extensions. We don't have extensions sub option yet, but I am about to introduce one for making sure an extensions can load. So lets level the floor first. Differential Revision: https://phab.mercurial-scm.org/D11819

automation: support Python 3.10 on Windows Python 3.10 is out and we should support it. This commit teaches the automation code to install and support building for Python 3.10. Differential Revision: https://phab.mercurial-scm.org/D11776

contrib: update Windows environment to Python 3.9.9 Let's keep the environment modern. Differential Revision: https://phab.mercurial-scm.org/D11775

rhg: implement the debugignorerhg subcommand This can be used to inspect the generated pattern, but also to benchmark the time it takes to parse hgignore. Differential Revision: https://phab.mercurial-scm.org/D11722

rhg: refactor to use IgnoreFnType alias more widely Differential Revision: https://phab.mercurial-scm.org/D11818

rhg: only complain about poorly configured fallback when falling back Differential Revision: https://phab.mercurial-scm.org/D11751

packaging: bump pygit2 to 1.7.1 Differential Revision: https://phab.mercurial-scm.org/D11805

packaging: bump windows_curses to 2.3.0 This is required for Python 3.10 support. Differential Revision: https://phab.mercurial-scm.org/D11804

packaging: regenerate the requirements files with pip-tools 6.4.0 Somewhere along the line, the formatting changed. There's no change in package content here- it's just some minor text changes. Py2 doesn't have any packages we'll be updating, so I'm not bothering there. Differential Revision: https://phab.mercurial-scm.org/D11803

rhg: Add support for `rhg status -n` The `RHG_STATUS=1` bit added here can be removed when `unset RHG_STATUS` near the top of the file is removed. Differential Revision: https://phab.mercurial-scm.org/D11815

filemerge: simplify slightly by using filectx.decodeddata() Differential Revision: https://phab.mercurial-scm.org/D11802

filemerge: rename _formatconflictmarker() since it formats a label `_formatconflictmarker()`'s name made me think that it would create something like `<<<<<<<` and maybe some more stuff after it, but it's actually just the label that comes after on the same line. So let's rename it to `_formatlabel()`. That's better aligned with the variables the result is assigned it. Differential Revision: https://phab.mercurial-scm.org/D11801

tests: fix test-fix on NetBSD Differential Revision: https://phab.mercurial-scm.org/D11816

rhg: Fix status desambiguation of symlinks and executable files Differential Revision: https://phab.mercurial-scm.org/D11774

rhg: Rename cat_file_is_modified It hasn’t been based on the "cat operation" for some time already. Differential Revision: https://phab.mercurial-scm.org/D11773

rhg: Also parse flags in the manifest parser Differential Revision: https://phab.mercurial-scm.org/D11772

rhg: Propogate manifest parse errors instead of panicking The Rust parser for the manifest file format is an iterator. Now every item from that iterator is a `Result`, which makes error handling required in multiple new places. This makes better recovery on errors possible, compare to a run time panic. Differential Revision: https://phab.mercurial-scm.org/D11771

tests: Adapt test-basic.t expected output for rhg Differential Revision: https://phab.mercurial-scm.org/D11769

rhg: Colored output is not supported Fallback if it is requested explicitly. The default is documented as use color "whenever it seems possible". rhg proceeds without color in that case. Differential Revision: https://phab.mercurial-scm.org/D11762