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Merged
pboling merged 2 commits into from
Sep 16, 2026
Merged

✨ Prefer markly for Markdown; stop forcing other Markdown backends #70

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a2a323c
✨ Prefer markly for Markdown; stop forcing other Markdown backends
pboling Sep 15, 2026
58e6967
Merge branch 'main' into fix/markdown-backend-markly-first
pboling Sep 16, 2026
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2 changes: 2 additions & 0 deletions CHANGELOG.md
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Expand Up @@ -50,6 +50,8 @@ Please file a bug if you notice a violation of semantic versioning.

- Extend the opt-in Rust Bash provider to preserve literal-title test_expect_success calls.

- markdown-merge: an unspecified (`:auto`) Markdown backend now prefers markly, then commonmarker, then kramdown, and uses kreuzberg-language-pack only as the last resort; optional backend gems are loaded markly first. The reported `available_markdown_backends` order is unchanged.

### Deprecated

### Removed
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7 changes: 7 additions & 0 deletions gems/kettle-jem/CHANGELOG.md
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Expand Up @@ -61,6 +61,13 @@ Please file a bug if you notice a violation of semantic versioning.

### Removed

- The `commonmarker-merge` and `kramdown-merge` runtime dependencies, and their
entries in the local sibling and `templating_local.gemfile` path lists.
kettle-jem merges Markdown with markly (via `ast-crispr-markdown-markly` and
`markly-merge`); other Markdown backends are still used when a project installs
them, but are no longer forced on every bundle. This also stops `commonmarker`'s
native extension from being compiled, which fails on ruby-head.

### Fixed

- The packaged `Gemfile` no longer overrides `git_source(:github)` with an SSH
Expand Down
2 changes: 0 additions & 2 deletions gems/kettle-jem/Gemfile
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Expand Up @@ -38,10 +38,8 @@ direct_sibling_gems = %w[
ast-merge
bash-merge
citrus-toml-merge
commonmarker-merge
dotenv-merge
json-merge
kramdown-merge
markdown-merge
markly-merge
prism-merge
Expand Down
36 changes: 1 addition & 35 deletions gems/kettle-jem/Gemfile.lock
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Expand Up @@ -17,15 +17,13 @@ PATH
ast-merge (~> 7.1, >= 7.1.8)
bash-merge (~> 7.1, >= 7.1.8)
citrus-toml-merge (~> 7.1, >= 7.1.8)
commonmarker-merge (~> 7.1, >= 7.1.8)
dotenv-merge (~> 7.1, >= 7.1.8)
json-merge (~> 7.1, >= 7.1.8)
kettle-changelog (~> 1.0, >= 1.0.7)
kettle-dev (~> 3.0, >= 3.0.34)
kettle-gha-pins (~> 0.3, >= 0.3.14)
kettle-ndjson (~> 0.1, >= 0.1.13)
kettle-rb (~> 0.1, >= 0.1.14)
kramdown-merge (~> 7.1, >= 7.1.8)
kettle-rb (~> 0.1, >= 0.1.11)
markdown-merge (~> 7.1, >= 7.1.8)
markly-merge (~> 7.1, >= 7.1.8)
parslet (~> 2.0)
Expand Down Expand Up @@ -116,14 +114,6 @@ PATH
toml-rb (~> 4.1)
version_gem (~> 1.1, >= 1.1.15)

PATH
remote: /var/home/pboling/src/my/structuredmerge/ruby/gems/commonmarker-merge
specs:
commonmarker-merge (7.1.9)
commonmarker (~> 2.2)
markdown-merge (= 7.1.9)
version_gem (~> 1.1, >= 1.1.15)

PATH
remote: /var/home/pboling/src/my/structuredmerge/ruby/gems/dotenv-merge
specs:
Expand Down Expand Up @@ -158,14 +148,6 @@ PATH
tree_haver (= 7.1.9)
version_gem (~> 1.1, >= 1.1.15)

PATH
remote: /var/home/pboling/src/my/structuredmerge/ruby/gems/kramdown-merge
specs:
kramdown-merge (7.1.9)
kramdown (~> 2.5)
markdown-merge (= 7.1.9)
version_gem (~> 1.1, >= 1.1.15)

PATH
remote: /var/home/pboling/src/my/structuredmerge/ruby/gems/markdown-merge
specs:
Expand Down Expand Up @@ -337,12 +319,6 @@ GEM
command_kit-completion (0.3.0)
command_kit (~> 0.1)
completely (~> 0.6)
commonmarker (2.10.0-aarch64-linux)
commonmarker (2.10.0-aarch64-linux-musl)
commonmarker (2.10.0-arm64-darwin)
commonmarker (2.10.0-x86_64-darwin)
commonmarker (2.10.0-x86_64-linux)
commonmarker (2.10.0-x86_64-linux-musl)
completely (0.8.0)
colsole (~> 1.0.0)
erb
Expand Down Expand Up @@ -779,7 +755,6 @@ DEPENDENCIES
bundler-audit (~> 0.9.3)
cgi (~> 0.5)
citrus-toml-merge!
commonmarker-merge!
debug (>= 1.1)
dotenv-merge!
erb (~> 6.0, >= 6.0.7)
Expand All @@ -796,7 +771,6 @@ DEPENDENCIES
kettle-soup-cover (~> 3.0, >= 3.0.10)
kettle-test (~> 2.0, >= 2.0.21)
kramdown (~> 2.5, >= 2.5.2)
kramdown-merge!
kramdown-parser-gfm (~> 1.1)
markdown-merge!
markly-merge!
Expand Down Expand Up @@ -867,13 +841,6 @@ CHECKSUMS
colsole (1.0.1) sha256=7632a300ace2db877c024ffe413c684954cf37e41264b75ace9f456c9d657b02
command_kit (0.6.0) sha256=e57f29cf5aee4f571c210041d910ff87f85749e42dfe75139c57cc93d84afa90
command_kit-completion (0.3.0) sha256=d9c498555125bcdd0c9d869f2a64a25a2f0205102a7f28c81c7937ae633ea737
commonmarker (2.10.0-aarch64-linux) sha256=eeb167dea203dee066eb0dd99b3fd2deb526c8b5e7297ad385f7a5d60f869478
commonmarker (2.10.0-aarch64-linux-musl) sha256=e95d9e87ea6306e21ffa11855a7bb55518538143b23a227fe3bb00b41873ce25
commonmarker (2.10.0-arm64-darwin) sha256=39ecc891d1e4308b5233cc28b40383de854a2bfbefe17d68e49174347a8aa79e
commonmarker (2.10.0-x86_64-darwin) sha256=01e0830ed0319825ecdc16411c90acd3f661d1568dfc178731b3f64d0ce2363d
commonmarker (2.10.0-x86_64-linux) sha256=945c510c0bfca9022245928e2248468fe3ddad58c939be0c37b20082cc392880
commonmarker (2.10.0-x86_64-linux-musl) sha256=288cd4fb9f17eed2ffa73551ef241dcf594e0f484b2aee2a0999540333c0618e
commonmarker-merge (7.1.9)
completely (0.8.0) sha256=e493cd5d84805f47917a41f277ecbfe5f35363bed670be5a957d3acaed8c6c5e
concurrent-ruby (1.3.8) sha256=b2f1be836e968ccc78ccfce277ea79c72a88633f22306782c16ff23fb415d1e1
date (3.5.1) sha256=750d06384d7b9c15d562c76291407d89e368dda4d4fff957eb94962d325a0dc0
Expand Down Expand Up @@ -914,7 +881,6 @@ CHECKSUMS
kettle-test (2.0.21) sha256=2ab0dd1a1d11568f8fba61084ebef84717cd4dff028a527777c92d4e77f0e9c5
kettle-wash (0.1.6) sha256=934dfb955f41b89540fe5df87614cf718a73ebc1696de7c50e7940a4695753ed
kramdown (2.5.2) sha256=1ba542204c66b6f9111ff00dcc26075b95b220b07f2905d8261740c82f7f02fa
kramdown-merge (7.1.9)
kramdown-parser-gfm (1.1.0) sha256=fb39745516427d2988543bf01fc4cf0ab1149476382393e0e9c48592f6581729
language_server-protocol (3.17.0.6) sha256=5ef2c0c138f8267e1bc631d3328347d354f96724b0af22f2c79516120443b7f0
lint_roller (1.1.0) sha256=2c0c845b632a7d172cb849cc90c1bce937a28c5c8ccccb50dfd46a485003cc87
Expand Down
2 changes: 0 additions & 2 deletions gems/kettle-jem/gemfiles/modular/templating_local.gemfile
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Expand Up @@ -36,13 +36,11 @@ structuredmerge_local_gems = %w[
ast-template
bash-merge
binary-merge
commonmarker-merge
citrus-toml-merge
dotenv-merge
go-merge
html-merge
json-merge
kramdown-merge
markdown-merge
markly-merge
parslet-toml-merge
Expand Down
4 changes: 1 addition & 3 deletions gems/kettle-jem/kettle-jem.gemspec
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Expand Up @@ -101,15 +101,13 @@ Gem::Specification.new do |spec|
spec.add_dependency("ast-merge", "~> 7.1", ">= 7.1.8") # ruby >= 4.0.0
spec.add_dependency("bash-merge", "~> 7.1", ">= 7.1.8") # ruby >= 4.0.0
spec.add_dependency("citrus-toml-merge", "~> 7.1", ">= 7.1.8") # ruby >= 4.0.0
spec.add_dependency("commonmarker-merge", "~> 7.1", ">= 7.1.8") # ruby >= 4.0.0
spec.add_dependency("dotenv-merge", "~> 7.1", ">= 7.1.8") # ruby >= 4.0.0
spec.add_dependency("json-merge", "~> 7.1", ">= 7.1.8") # ruby >= 4.0.0
spec.add_dependency("kettle-changelog", "~> 1.0", ">= 1.0.7") # ruby >= 4.0.0
spec.add_dependency("kettle-dev", "~> 3.0", ">= 3.0.34") # ruby >= 2.3.0
spec.add_dependency("kettle-gha-pins", "~> 0.3", ">= 0.3.14") # ruby >= 2.4.0
spec.add_dependency("kettle-ndjson", "~> 0.1", ">= 0.1.13") # ruby >= 2.4.0
spec.add_dependency("kettle-rb", "~> 0.1", ">= 0.1.14") # ruby >= 1.8.7
spec.add_dependency("kramdown-merge", "~> 7.1", ">= 7.1.8") # ruby >= 4.0.0
spec.add_dependency("kettle-rb", "~> 0.1", ">= 0.1.11") # ruby >= 1.8.7
spec.add_dependency("markdown-merge", "~> 7.1", ">= 7.1.8") # ruby >= 4.0.0
spec.add_dependency("markly-merge", "~> 7.1", ">= 7.1.8") # ruby >= 4.0.0
spec.add_dependency("parslet", "~> 2.0") # ruby >= 2.6.0
Expand Down
2 changes: 0 additions & 2 deletions gems/kettle-jem/lib/kettle/jem/templates/gemfiles/modular/templating_local.gemfile.example
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Expand Up @@ -13,14 +13,12 @@ structuredmerge_local_gems = %w[
ast-template
bash-merge
binary-merge
commonmarker-merge
citrus-toml-merge
dotenv-merge
go-merge
html-merge
json-merge
kettle-jem
kramdown-merge
markdown-merge
markly-merge
parslet-toml-merge
Expand Down
91 changes: 45 additions & 46 deletions gems/markdown-merge/.rubocop_gradual.lock
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Expand Up @@ -93,53 +93,52 @@
"lib/markdown-merge.rb:2827716783": [
[1, 1, 0, "Naming/FileName: The name of this source file (`markdown-merge.rb`) should use snake_case.", 5381]
],
"lib/markdown/merge.rb:2631994489": [
"lib/markdown/merge.rb:1534005504": [
[8, 3, 12, "Style/Documentation: Missing top-level documentation comment for `module Markdown::Merge`.", 2866359175],
[8, 3, 25562, "Metrics/ModuleLength: Module has too many lines. [591/100]", 2772054550],
[20, 5, 16, "Style/Documentation: Missing top-level documentation comment for `class Markdown::Merge::ParseError`.", 362242086],
[153, 5, 1014, "Metrics/MethodLength: Method has too many lines. [24/10]", 650805533],
[179, 5, 73, "Lint/ShadowedException: Do not shadow rescued Exceptions.", 2046499071],
[183, 5, 678, "Metrics/AbcSize: Assignment Branch Condition size for `match_markdown_owners` is too high. [<10, 23, 8> 26.32/17]", 2124140148],
[183, 5, 678, "Metrics/CyclomaticComplexity: Cyclomatic complexity for `match_markdown_owners` is too high. [9/7]", 2124140148],
[183, 5, 678, "Metrics/PerceivedComplexity: Perceived complexity for `match_markdown_owners` is too high. [9/8]", 2124140148],
[196, 5, 1188, "Metrics/AbcSize: Assignment Branch Condition size for `merge_markdown` is too high. [<10, 25, 8> 28.09/17]", 3592129796],
[196, 5, 1188, "Metrics/CyclomaticComplexity: Cyclomatic complexity for `merge_markdown` is too high. [9/7]", 3592129796],
[196, 5, 1188, "Metrics/MethodLength: Method has too many lines. [23/10]", 3592129796],
[196, 5, 1188, "Metrics/PerceivedComplexity: Perceived complexity for `merge_markdown` is too high. [9/8]", 3592129796],
[225, 5, 513, "Metrics/MethodLength: Method has too many lines. [13/10]", 912081106],
[243, 5, 747, "Metrics/MethodLength: Method has too many lines. [16/10]", 3172863125],
[274, 5, 1513, "Metrics/AbcSize: Assignment Branch Condition size for `apply_markdown_delegated_child_outputs` is too high. [<16, 37, 9> 41.3/17]", 3320736661],
[274, 5, 1513, "Metrics/CyclomaticComplexity: Cyclomatic complexity for `apply_markdown_delegated_child_outputs` is too high. [10/7]", 3320736661],
[274, 5, 1513, "Metrics/MethodLength: Method has too many lines. [30/10]", 3320736661],
[274, 5, 1513, "Metrics/PerceivedComplexity: Perceived complexity for `apply_markdown_delegated_child_outputs` is too high. [10/8]", 3320736661],
[312, 5, 1058, "Metrics/MethodLength: Method has too many lines. [23/10]", 2000305522],
[339, 5, 1103, "Metrics/MethodLength: Method has too many lines. [23/10]", 2615729942],
[339, 52, 144, "Metrics/ParameterLists: Avoid parameter lists longer than 5 parameters. [6/5]", 3050457682],
[367, 5, 817, "Metrics/MethodLength: Method has too many lines. [13/10]", 322304706],
[372, 121, 74, "Layout/LineLength: Line is too long. [194/120]", 2378183959],
[385, 5, 805, "Metrics/MethodLength: Method has too many lines. [13/10]", 935244360],
[390, 121, 66, "Layout/LineLength: Line is too long. [186/120]", 2974266470],
[403, 5, 722, "Metrics/MethodLength: Method has too many lines. [12/10]", 1758487766],
[408, 121, 17, "Layout/LineLength: Line is too long. [137/120]", 3013228499],
[420, 5, 730, "Metrics/MethodLength: Method has too many lines. [12/10]", 3297037131],
[425, 121, 17, "Layout/LineLength: Line is too long. [137/120]", 3013228499],
[451, 5, 1584, "Metrics/AbcSize: Assignment Branch Condition size for `collect_markdown_owners` is too high. [<21, 32, 13> 40.42/17]", 572024212],
[451, 5, 1584, "Metrics/CyclomaticComplexity: Cyclomatic complexity for `collect_markdown_owners` is too high. [11/7]", 572024212],
[451, 5, 1584, "Metrics/MethodLength: Method has too many lines. [45/10]", 572024212],
[451, 5, 1584, "Metrics/PerceivedComplexity: Perceived complexity for `collect_markdown_owners` is too high. [11/8]", 572024212],
[505, 5, 1147, "Metrics/AbcSize: Assignment Branch Condition size for `markdown_owner_start_indices` is too high. [<21, 22, 11> 32.34/17]", 12516264],
[505, 5, 1147, "Metrics/CyclomaticComplexity: Cyclomatic complexity for `markdown_owner_start_indices` is too high. [9/7]", 12516264],
[505, 5, 1147, "Metrics/MethodLength: Method has too many lines. [33/10]", 12516264],
[505, 5, 1147, "Metrics/PerceivedComplexity: Perceived complexity for `markdown_owner_start_indices` is too high. [9/8]", 12516264],
[546, 5, 602, "Metrics/AbcSize: Assignment Branch Condition size for `collect_markdown_sections` is too high. [<9, 20, 6> 22.74/17]", 1946206422],
[546, 5, 602, "Metrics/MethodLength: Method has too many lines. [14/10]", 1946206422],
[554, 7, 11, "Style/MultilineBlockChain: Avoid multi-line chains of blocks.", 848344986],
[565, 5, 1097, "Metrics/AbcSize: Assignment Branch Condition size for `markdown_fence_ranges` is too high. [<19, 21, 11> 30.38/17]", 2035260313],
[565, 5, 1097, "Metrics/CyclomaticComplexity: Cyclomatic complexity for `markdown_fence_ranges` is too high. [8/7]", 2035260313],
[565, 5, 1097, "Metrics/MethodLength: Method has too many lines. [31/10]", 2035260313],
[581, 13, 227, "Metrics/BlockNesting: Avoid more than 3 levels of block nesting.", 1054958538],
[603, 5, 332, "Metrics/MethodLength: Method has too many lines. [14/10]", 2041170985],
[639, 5, 549, "Metrics/MethodLength: Method has too many lines. [12/10]", 2513777426]
[8, 3, 25887, "Metrics/ModuleLength: Module has too many lines. [592/100]", 1841984214],
[24, 5, 16, "Style/Documentation: Missing top-level documentation comment for `class Markdown::Merge::ParseError`.", 362242086],
[157, 5, 1014, "Metrics/MethodLength: Method has too many lines. [24/10]", 650805533],
[187, 5, 678, "Metrics/AbcSize: Assignment Branch Condition size for `match_markdown_owners` is too high. [<10, 23, 8> 26.32/17]", 2124140148],
[187, 5, 678, "Metrics/CyclomaticComplexity: Cyclomatic complexity for `match_markdown_owners` is too high. [9/7]", 2124140148],
[187, 5, 678, "Metrics/PerceivedComplexity: Perceived complexity for `match_markdown_owners` is too high. [9/8]", 2124140148],
[200, 5, 1188, "Metrics/AbcSize: Assignment Branch Condition size for `merge_markdown` is too high. [<10, 25, 8> 28.09/17]", 3592129796],
[200, 5, 1188, "Metrics/CyclomaticComplexity: Cyclomatic complexity for `merge_markdown` is too high. [9/7]", 3592129796],
[200, 5, 1188, "Metrics/MethodLength: Method has too many lines. [23/10]", 3592129796],
[200, 5, 1188, "Metrics/PerceivedComplexity: Perceived complexity for `merge_markdown` is too high. [9/8]", 3592129796],
[229, 5, 513, "Metrics/MethodLength: Method has too many lines. [13/10]", 912081106],
[247, 5, 747, "Metrics/MethodLength: Method has too many lines. [16/10]", 3172863125],
[278, 5, 1513, "Metrics/AbcSize: Assignment Branch Condition size for `apply_markdown_delegated_child_outputs` is too high. [<16, 37, 9> 41.3/17]", 3320736661],
[278, 5, 1513, "Metrics/CyclomaticComplexity: Cyclomatic complexity for `apply_markdown_delegated_child_outputs` is too high. [10/7]", 3320736661],
[278, 5, 1513, "Metrics/MethodLength: Method has too many lines. [30/10]", 3320736661],
[278, 5, 1513, "Metrics/PerceivedComplexity: Perceived complexity for `apply_markdown_delegated_child_outputs` is too high. [10/8]", 3320736661],
[316, 5, 1058, "Metrics/MethodLength: Method has too many lines. [23/10]", 2000305522],
[343, 5, 1103, "Metrics/MethodLength: Method has too many lines. [23/10]", 2615729942],
[343, 52, 144, "Metrics/ParameterLists: Avoid parameter lists longer than 5 parameters. [6/5]", 3050457682],
[371, 5, 817, "Metrics/MethodLength: Method has too many lines. [13/10]", 322304706],
[376, 121, 74, "Layout/LineLength: Line is too long. [194/120]", 2378183959],
[389, 5, 805, "Metrics/MethodLength: Method has too many lines. [13/10]", 935244360],
[394, 121, 66, "Layout/LineLength: Line is too long. [186/120]", 2974266470],
[407, 5, 722, "Metrics/MethodLength: Method has too many lines. [12/10]", 1758487766],
[412, 121, 17, "Layout/LineLength: Line is too long. [137/120]", 3013228499],
[424, 5, 730, "Metrics/MethodLength: Method has too many lines. [12/10]", 3297037131],
[429, 121, 17, "Layout/LineLength: Line is too long. [137/120]", 3013228499],
[455, 5, 1584, "Metrics/AbcSize: Assignment Branch Condition size for `collect_markdown_owners` is too high. [<21, 32, 13> 40.42/17]", 572024212],
[455, 5, 1584, "Metrics/CyclomaticComplexity: Cyclomatic complexity for `collect_markdown_owners` is too high. [11/7]", 572024212],
[455, 5, 1584, "Metrics/MethodLength: Method has too many lines. [45/10]", 572024212],
[455, 5, 1584, "Metrics/PerceivedComplexity: Perceived complexity for `collect_markdown_owners` is too high. [11/8]", 572024212],
[509, 5, 1147, "Metrics/AbcSize: Assignment Branch Condition size for `markdown_owner_start_indices` is too high. [<21, 22, 11> 32.34/17]", 12516264],
[509, 5, 1147, "Metrics/CyclomaticComplexity: Cyclomatic complexity for `markdown_owner_start_indices` is too high. [9/7]", 12516264],
[509, 5, 1147, "Metrics/MethodLength: Method has too many lines. [33/10]", 12516264],
[509, 5, 1147, "Metrics/PerceivedComplexity: Perceived complexity for `markdown_owner_start_indices` is too high. [9/8]", 12516264],
[550, 5, 602, "Metrics/AbcSize: Assignment Branch Condition size for `collect_markdown_sections` is too high. [<9, 20, 6> 22.74/17]", 1946206422],
[550, 5, 602, "Metrics/MethodLength: Method has too many lines. [14/10]", 1946206422],
[558, 7, 11, "Style/MultilineBlockChain: Avoid multi-line chains of blocks.", 848344986],
[569, 5, 1097, "Metrics/AbcSize: Assignment Branch Condition size for `markdown_fence_ranges` is too high. [<19, 21, 11> 30.38/17]", 2035260313],
[569, 5, 1097, "Metrics/CyclomaticComplexity: Cyclomatic complexity for `markdown_fence_ranges` is too high. [8/7]", 2035260313],
[569, 5, 1097, "Metrics/MethodLength: Method has too many lines. [31/10]", 2035260313],
[585, 13, 227, "Metrics/BlockNesting: Avoid more than 3 levels of block nesting.", 1054958538],
[607, 5, 332, "Metrics/MethodLength: Method has too many lines. [14/10]", 2041170985],
[643, 5, 549, "Metrics/MethodLength: Method has too many lines. [12/10]", 2513777426]
],
"lib/markdown/merge/backend_support.rb:1910609966": [
[6, 5, 7153, "Metrics/ModuleLength: Module has too many lines. [161/100]", 606467501],
Expand Down
9 changes: 7 additions & 2 deletions gems/markdown-merge/lib/markdown/merge.rb
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Expand Up @@ -13,6 +13,10 @@ module Merge
'markly' => TreeHaver::BackendReference.new(id: 'markly', family: 'native').freeze,
'kramdown' => TreeHaver::BackendReference.new(id: 'kramdown', family: 'native').freeze
}.freeze
# Order in which an unspecified (:auto) backend is chosen from those available.
# Markly is the most capable Markdown parser; the language pack is the last
# resort. BACKEND_REFERENCES keeps the shared fixtures' reporting order.
BACKEND_PREFERENCE = %w[markly commonmarker kramdown kreuzberg-language-pack].freeze
BACKEND_REGISTRY = Struct.new(:registered, :mutex).new(false, Mutex.new)

class Error < Ast::Merge::Error; end
Expand Down Expand Up @@ -632,7 +636,7 @@ def resolve_backend(backend)
current = TreeHaver.current_backend_id
return current if BACKEND_REFERENCES.key?(current.to_s) && markdown_backend_available_for_analysis?(current)

BACKEND_REFERENCES.keys.find { |backend_id| markdown_backend_available_for_analysis?(backend_id) } ||
BACKEND_PREFERENCE.find { |backend_id| markdown_backend_available_for_analysis?(backend_id) } ||
'kreuzberg-language-pack'
end

Expand Down Expand Up @@ -713,9 +717,10 @@ def unsupported_feature_result(message)

Markdown::Merge.register_provider!

# Optional backends: loaded when their gems are installed, never required.
%w[
commonmarker/merge/backend
markly/merge/backend
commonmarker/merge/backend
].each do |feature|
require feature
rescue LoadError
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