Adding upstream version 2.1.0.upstream/2.1.0upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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+# Change Log
+
+## 2.1.0 - 2022-04-15
+
+This release is primarily to replace the `attrs` package dependency,
+with the built-in Python `dataclasses` package.
+
+This should not be a breaking change, for most use cases.
+
+- ⬆️ UPGRADE: Drop support for EOL Python 3.6 (#194)
+- ♻️ REFACTOR: Move `Rule`/`Delimiter` classes from `attrs` to `dataclass` (#211)
+- ♻️ REFACTOR: Move `Token` class from `attrs` to `dataclass` (#211)
+- ‼️ Remove deprecated `NestedTokens` and `nest_tokens`
+- ✨ NEW: Save ordered list numbering (#192)
+- 🐛 FIX: Combination of blockquotes, list and newlines causes `IndexError` (#207)
+
+## 2.0.1 - 2022-24-01
+
+- 🐛 FIX: Crash when file ends with empty blockquote line.
+- ✨ NEW: Add `inline_definitions` option.
+  This option allows for `definition` token to be inserted into the token stream, at the point where the definition is located in the source text.
+  It is useful for cases where one wishes to capture a "loseless" syntax tree of the parsed Markdown (in conjunction with the `store_labels` option).
+
+## 2.0.0 - 2021-12-03
+
+- ⬆️ Update: Sync with markdown-it v12.1.0 and CommonMark v0.30
+- ♻️ REFACTOR: Port `mdurl` and `punycode` for URL normalisation (thanks to @hukkin!).
+  This port fixes the outstanding CommonMark compliance tests.
+- ♻️ REFACTOR: Remove `AttrDict`.
+  This is no longer used is core or mdit-py-plugins, instead standard dictionaries are used.
+- 👌 IMPROVE: Use `__all__` to signal re-exports
+
+## 1.1.0 - 2021-05-08
+
+ ⬆️ UPGRADE: `attrs` -> v21 (#165)
+
+This release has no breaking changes
+(see: <https://github.com/python-attrs/attrs/blob/main/CHANGELOG.rst>)
+
+## 1.0.0 - 2021-05-02
+
+[Full commit log](https://github.com/executablebooks/markdown-it-py/compare/v0.6.2...v1.0.0)
+
+The first stable release of markdown-it-py 🎉
+
+See the changes in the beta releases below,
+thanks to all the [contributors](https://github.com/executablebooks/markdown-it-py/graphs/contributors?from=2020-03-22&to=2021-05-02&type=c) in the last year!
+
+## 1.0.0b3 - 2021-05-01
+
+- 👌 IMPROVE: Add `RendererProtocol` type, for typing renderers (thanks to [@hukkinj1](https://github.com/hukkinj1))
+- 🔧 MAINTAIN: `None` is no longer allowed as a valid `src` input for `StateBase` subclasses
+
+## 1.0.0b2 - 2021-04-25
+
+‼️ BREAKING: Move `mdit-py-plugins` out of the core install requirements and into a `plugins` extra.
+
+Synchronised code with the upstream Markdown-It `v12.0.6`:
+
+- 🐛 FIX: Raise HTML blocks priority to resolve conflict with headings
+- 🐛 FIX: Newline not rendered in image alt attribute
+
+## 1.0.0b1 - 2021-03-31
+
+[Full commit log](https://github.com/executablebooks/markdown-it-py/compare/v0.6.2...9ecda04)
+
+This is the first beta release of the stable v1.x series.
+
+There are four notable (and breaking) changes:
+
+1. The code has been synchronised with the upstream Markdown-It `v12.0.4`.
+   In particular, this update alters the parsing of tables to be consistent with the GFM specification: <https://github.github.com/gfm/#tables-extension->
+   A number of parsing performance and validation improvements are also included.
+2. `Token.attrs` are now stored as dictionaries, rather than a list of lists.
+   This is a departure from upstream Markdown-It, allowed by Pythons guarantee of ordered dictionaries (see [#142](https://github.com/markdown-it/markdown-it/issues/142)), and is the more natural representation.
+   Note `attrGet`, `attrSet`, `attrPush` and `attrJoin` methods remain identical to those upstream,
+   and `Token.as_dict(as_upstream=True)` will convert the token back to a directly comparable dict.
+3. The use of `AttrDict` has been replaced:
+   For `env` any Python mutable mapping is now allowed, and so attribute access to keys is not (differing from the Javascript dictionary).
+   For `MarkdownIt.options` it is now set as an `OptionsDict`, which is a dictionary sub-class, with attribute access only for core MarkdownIt configuration keys.
+4. Introduction of the `SyntaxTreeNode`.
+   This is a more comprehensive replacement for `nest_tokens` and `NestedTokens` (which are now deprecated).
+   It allows for the `Token` stream to be converted to/from a nested tree structure, with opening/closing tokens collapsed into a single `SyntaxTreeNode` and the intermediate tokens set as children.
+   See [Creating a syntax tree](https://markdown-it-py.readthedocs.io/en/latest/using.html#creating-a-syntax-tree) documentation for details.
+
+### Additional Fixes 🐛
+
+- Fix exception due to empty lines after blockquote+footnote
+- Fix linkify link nesting levels
+- Fix the use of `Ruler.at` for plugins
+- Avoid fenced token mutations during rendering
+- Fix CLI version info and correct return of exit codes
+
+## 0.6.2 - 2021-02-07
+
+This release brings Markdown-It-Py inline with Markdown-It v11.0.1 (2020-09-14), applying two fixes:
+
+- Fix blockquote lazy newlines, [[#696](https://github.com/markdown-it/markdown-it/issues/696)].
+- Fix missed mappings for table rows, [[#705](https://github.com/markdown-it/markdown-it/issues/705)].
+
+Thanks to [@hukkinj1](https://github.com/hukkinj1)!
+
+## 0.6.1 - 2021-01-01
+
+This release provides some improvements to the code base:
+
+- 🐛 FIX: Do not resolve backslash escapes inside auto-links
+- 🐛 FIX: Add content to image tokens
+- 👌 IMPROVE: Add more type annotations, thanks to [@hukkinj1](https://github.com/hukkinj1)
+
+## 0.6.0 - 2020-12-15
+
+🗑 DEPRECATE: Move plugins to `mdit_py_plugins`
+
+Plugins (in `markdown_it.extensions`) have now been moved to [executablebooks/mdit-py-plugins](https://github.com/executablebooks/mdit-py-plugins).
+This will allow for their maintenance to occur on a different cycle to the core code, facilitating the release of a v1.0.0 for this package
+
+🔧 MAINTAIN: Add [mypy](https://mypy.readthedocs.io) type-checking, thanks to [@hukkinj1](https://github.com/hukkinj1).
+
+## 0.5.8 - 2020-12-13
+
+✨ NEW: Add linkify, thanks to [@tsutsu3](https://github.com/tsutsu3).
+
+This extension uses [linkify-it-py](https://github.com/tsutsu3/linkify-it-py) to identify URL links within text:
+
+- `github.com` -> `<a href="http://github.com">github.com</a>`
+
+**Important:** To use this extension you must install linkify-it-py; `pip install markdown-it-py[linkify]`
+
+It can then be activated by:
+
+```python
+from markdown_it import MarkdownIt
+md = MarkdownIt().enable("linkify")
+md.options["linkify"] = True
+```
+
+## 0.5.7 - 2020-12-13
+
+✨ NEW: Add smartquotes, thanks to [@tsutsu3](https://github.com/tsutsu3).
+
+This extension will convert basic quote marks to their opening and closing variants:
+
+- 'single quotes' -> ‘single quotes’
+- "double quotes" -> “double quotes”
+
+It can be activated by:
+
+```python
+from markdown_it import MarkdownIt
+md = MarkdownIt().enable("smartquotes")
+md.options["typographer"] = True
+```
+
+✨ NEW: Add markdown-it-task-lists plugin, thanks to [@wna-se](https://github.com/wna-se).
+
+This is a port of the JS [markdown-it-task-lists](https://github.com/revin/markdown-it-task-lists),
+for building task/todo lists out of markdown lists with items starting with `[ ]` or `[x]`.
+For example:
+
+```markdown
+- [ ] An item that needs doing
+- [x] An item that is complete
+```
+
+This plugin can be activated by:
+
+```python
+from markdown_it import MarkdownIt
+from markdown_it.extensions.tasklists import tasklists_plugin
+md = MarkdownIt().use(tasklists_plugin)
+```
+
+🐛 Various bug fixes, thanks to [@hukkinj1](https://github.com/hukkinj1):
+
+- Do not copy empty `env` arg in `MarkdownIt.render`
+- `_Entities.__contains__` fix return data
+- Parsing of unicode ordinals
+- Handling of final character in `skipSpacesBack` and `skipCharsBack` methods
+- Avoid exception when document ends in heading/blockquote marker
+
+🧪 TESTS: Add CI for Python 3.9 and PyPy3
+
+## 0.5.6 - 2020-10-21
+
+- ✨ NEW: Add simple typographic replacements, thanks to [@tsutsu3](https://github.com/tsutsu3):
+  This allows you to add the `typographer` option to the parser, to replace particular text constructs:
+
+  - ``(c)``, ``(C)`` → ©
+  - ``(tm)``, ``(TM)`` → ™
+  - ``(r)``, ``(R)`` → ®
+  - ``(p)``, ``(P)`` → §
+  - ``+-`` → ±
+  - ``...`` → …
+  - ``?....`` → ?..
+  - ``!....`` → !..
+  - ``????????`` → ???
+  - ``!!!!!`` → !!!
+  - ``,,,`` → ,
+  - ``--`` → &ndash
+  - ``---`` → &mdash
+
+  ```python
+  md = MarkdownIt().enable("replacements")
+  md.options["typographer"] = True
+  ```
+
+- 📚 DOCS: Improve documentation for CLI, thanks to [@westurner](https://github.com/westurner)
+- 👌 IMPROVE: Use `re.sub()` instead of `re.subn()[0]`, thanks to [@hukkinj1](https://github.com/hukkinj1)
+- 🐛 FIX: An exception raised by having multiple blank lines at the end of some files
+
+## 0.5.5 - 2020-09-27
+
+👌 IMPROVE: Add `store_labels` option.
+
+This allows for storage of original reference label in link/image token's metadata,
+which can be useful for renderers.
+
+## 0.5.4 - 2020-09-08
+
+✨ NEW: Add `anchors_plugin` for headers, which can produce:
+
+```html
+<h1 id="title-string">Title String <a class="header-anchor" href="#title-string">¶</a></h1>
+```
+
+## 0.5.3 - 2020-09-04
+
+🐛 Fixed an undefined variable in the reference block.
+
+## 0.5.2 - 2020-08-22
+
+🐛 Fixed an `IndexError` in `container_plugin`, when there is no newline on the closing tag line.
+
+## 0.5.1 - 2020-08-21
+
+⬆️ UPGRADE: attrs -> v20
+
+This is not breaking, since it only deprecates Python 3.4 (see [CHANGELOG.rst](https://github.com/python-attrs/attrs/blob/master/CHANGELOG.rst))
+
+## 0.5.0 - 2020-08-18
+
+### Added ✨
+
+- `deflist` and `dollarmath` plugins (see [plugins list](https://markdown-it-py.readthedocs.io/en/latest/plugins.html)).
+
+### Improved 👌
+
+- Added benchmarking tests and CI (see <https://executablebooks.github.io/markdown-it-py/dev/bench/>)
+- Improved performance of computing ordinals (=> 10-15% parsing speed increase).
+  Thanks to [@sildar](https://github.com/sildar)!
+
+### Fixed 🐛
+
+- Stopped empty lines at the end of the document, after certain list blocks, raising an exception (#36).
+- Allow myst-role to accept names containing digits (0-9).
+
+## 0.4.9 - 2020-08-11
+
+### Added ✨
+
+- `containers` plugin (see [plugins list](https://markdown-it-py.readthedocs.io/en/latest/plugins.html))
+
+### Documented 📚
+
+- Plugins and improved contributing section