[leynos]

Summary

Fixes #561. --wrap now breaks a line only where the source already has whitespace, and a break it makes never leaves trailing spaces.

Markdown renders a soft line break as a space. A break placed between two characters that touch in the source therefore adds a space to the rendered text, and two or more spaces left at a line end render as a hard break <br />. All five reported shapes are fixed:

Shape	Input	0.6.0 renders
Opening parenthesis before a reference link	([Python Packaging][4])	( Python Packaging)
Slash between code spans	`Mutex`/`MutexGuard`	`Mutex`/ `MutexGuard`
Bracket inside a word	(Alice)-[r]->(Bob)	(Alice)-[ r]->(Bob)
Strong emphasis around code	**`Node.isConnected`**	literal **, emphasis lost
Mirror: closing bracket before punctuation	[Python Packaging][4]).	Packaging ).
Break at a run of two spaces	auto-scroll (a6d912d2)	auto-scroll<br />(a6d912d2)

Table 1: The six shapes from #561 and how 0.6.0 renders them.

The change

• src/wrap/inline/touching.rs (new): join_touching_fragments runs after grouping. It merges any two neighbouring fragments whose seam has no whitespace. It reads the text at the seam rather than the fragment kinds, because grouping sometimes couples a leading space into a fragment (a bare bracket reference carries the space before it). Whitespace fragments are then the only break opportunities textwrap sees. This one rule replaces a family of per-construct couplings, each of which covered one shape.
• render_line trims every trailing space from a line the wrapper broke. Only the final line keeps the source's own trailing spaces, which is where a real hard break lives.
• Documentation: the users' guide states the break-point rule, the developers' guide describes join_touching_fragments, and docs/trailing-spaces.md adds the break-side rule.

A run with no whitespace in it is never split, even when that leaves a line longer than the target width.

Regression history

I bisected with a shape checker over released versions (0.3.1 to 0.6.0) and then over commits. None of the shapes is a single regression:

Shape	First bad commit	Pull request
Slash, bracket-in-word, strong-code, mirror	2de1134 (2026-04-23)	#271, "Switch wrapping to textwrap with adapter and unified prefixes"
Parenthesis before a reference link	6758894 (2026-07-18)	#395, "Harden wrapping and table reflow"
Hard break at a run of spaces	822f964 (2025-09-27)	#233, "Refactor wrap_preserving_code into helper utilities"

Table 2: The first bad commit for each shape.

• Switch wrapping to textwrap with adapter and unified prefixes #271 moved wrapping onto textwrap fragments. The earlier wrapper split only at whitespace. The fragment builder instead emitted punctuation and Markdown syntax as separate fragments, and textwrap may break between any two fragments. From then on, attached constructs were protected one coupling at a time: opening punctuation before code or an inline link, a hyphen prefix before code, and a digit bracket reference. Every shape without its own coupling was left breakable.
• Harden wrapping and table reflow (#388) (#374) (#372) (#364) #395 made a reference-style link ([text][ref]) one token. The ( before it was then no longer coupled, because the coupling recognizes only inline links ([text](url)).
• Refactor wrap_preserving_code into helper utilities #233 introduced the rule that keeps a line's trailing spaces when there are two or more. In the same change it added wrap_preserving_code_splits_after_consecutive_whitespace, which pinned "alpha " and "beta " as expected output, so the test asserted the defect.

Why no test caught it

• The wrap properties check specific invariants: footnote references kept whole, closing backticks not orphaned, and code-span deferral. No property checked the general one, that wrapping keeps every whitespace-separated word of the input. Each coupling's tests proved only its own construct, so nothing failed for an uncoupled shape.
• The one test covering a break at repeated spaces asserted the hard break (see Refactor wrap_preserving_code into helper utilities #233 above). It is renamed wrap_preserving_code_trims_consecutive_whitespace_at_breaks, and its expectation is restored to ["alpha", "beta", "gamma"].
• The spanning_code_span_- snapshot recorded a line broken between kani-full and a following backtick. The source has no whitespace there, so the rendering gained a space. The snapshot is corrected to keep kani-full` together.

Tests

tests/issue_561_wrap_never_breaks_without_whitespace.rs. Its invariant is that --wrap never inserts a break where the source had no whitespace, and never leaves trailing spaces on a line it broke.

• One case per reproduction shape: the four touching runs, the mirror case and the double space. There is also a control that a source hard break survives.
• A property over generated paragraphs whose words are glued by /, -, brackets, parentheses, ** and code spans, at widths from 20 to 99. It checks three things:
  • the output's whitespace-separated words equal the input's, which is the rendered-content oracle for this defect;
  • no line the wrapper broke ends in a space;
  • a second pass changes nothing.

It fails without the fix. Results of running the same file without the fix:

Commit	Failing cases
main before rebase (9d1604f)	every shape case, the hard-break case and the property
6758894 (#395)	every shape case, the hard-break case, the source-hard-break control and the property
2de1134 (#271)	every shape case and both hard-break cases
822f964 (#233)	the parenthesis case and both hard-break cases

Table 3: Which cases fail at each commit without the fix.

At 2de1134 and 822f964 the property half was removed, because those commits predate the proptest dependency; the case tests are unchanged. At 822f964 the parenthesis shape was already broken. It was fixed before 0.3.1 and broke again in #395.

Mutations, each killed:

• Never joining touching fragments fails every shape case, the property and the corrected snapshot.
• Reading fragment kinds instead of the seam text fails the Idempotence: a bracket reference split by wrapping is rejoined on the second pass #504 bracket-reference seam cases.
• Restoring the old trailing-space rule fails both hard-break tests.

Estate check. I reran the adoption survey's rendered-content check over 43 repositories with this build. Repositories with a content-changing site fell from 25 to 7. The remaining sites belong to #562 (Setext), #563 (renumber), #564 (reopened code spans in a prefixed block) and #565 (HTML blocks). One more comes from a broken table that mdtablefix reflows by design.

Relation to open work

The user's #556 ("Preserve unspaced inline code seams") couples a non-whitespace token to a following code span. That covers the slash and strong-code shapes. This change covers every seam, those two included. The two are compatible: #556 makes the seams atomic during grouping, and this merge would find nothing left to join. #507 is fixed by the same mechanism ([ touching a]) and gets its own pull request with its corpus fixture and ADR update.

Gates

make check-fmt, make markdownlint, make nixie, make test, make lint, make typecheck, make verus, make verus-selftest and make verus-mutation, run after rebasing onto 91aa6d9.

Proof issue

#571 ("Proof: wrapping breaks lines only at source whitespace") extends #488 with the break-opportunity lemma this fix establishes, and records what a proof would force in the wrapper's structure.

Summary by Sourcery

Prevent --wrap from changing rendered text by restricting breaks to source whitespace and eliminating trailing spaces on wrapper-created line breaks.

Bug Fixes:

• Ensure wrapped lines break only at whitespace already present in the source, preventing Markdown wrapping from inserting spaces into touching inline constructs.
• Remove trailing spaces from lines broken by the wrapper while preserving source-authored trailing spaces and hard breaks.

Enhancements:

• Centralize whitespace-aware fragment joining so all whitespace-free inline seams remain atomic during wrapping.

Documentation:

• Document the source-whitespace break rule and the handling of trailing spaces and hard breaks across user, developer, architecture, and trailing-space guides.

Tests:

• Add regression coverage for reported touching-inline shapes, repeated-space breaks, source hard breaks, CLI output, idempotence, and generated paragraphs.

Chores:

• Update the wrapping ADR with the structural rationale and trade-offs for whitespace-only break opportunities.

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📒 Files selected for processing (4)

• CHANGELOG.md
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• tests/issue_561_wrap_never_breaks_without_whitespace.rs

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Summary

• Join adjacent inline fragments when their seam contains no source whitespace. Keep each run intact, even when it exceeds the target width.
• Trim trailing spaces from lines created by wrapping. Preserve source-authored trailing spaces on the final line.
• Add regression and property-based tests for content preservation, whitespace handling, and idempotence. Update the wrapping documentation and existing test expectations.
• Record the design in ADR 0002 and address issue #561.

Walkthrough

Join adjacent inline fragments when they meet without whitespace. Wrap only at source whitespace. Remove trailing spaces from wrapper-created line breaks and retain source trailing spaces on the final line.

Changes

Paragraph wrapping

Layer / File(s)	Summary
Join fragments at whitespace boundaries src/wrap/inline.rs, src/wrap/inline/touching.rs, tests/issue_561_wrap_never_breaks_without_whitespace.rs, docs/developers-guide.md, docs/users-guide.md, docs/architecture.md, docs/adrs/0002-textwrap-wrapping-engine.md, CHANGELOG.md	Join touching inline fragments before line fitting. Add regression tests for Markdown syntax and punctuation that must not be split across lines. Document whitespace-based break points and the possibility that whitespace-free runs exceed the target width.
Trim wrapper-created line endings src/wrap/inline.rs, src/wrap/tests/inline_wrapping.rs, tests/issue_561_wrap_never_breaks_without_whitespace.rs, docs/users-guide.md, docs/trailing-spaces.md, docs/architecture.md, docs/adrs/0002-textwrap-wrapping-engine.md, CHANGELOG.md	Remove trailing spaces from non-final wrapped lines and retain source trailing spaces on the final line. Tests cover double-space breaks, authored hard breaks, command-line output and wrapping idempotence.

Suggested labels: Issue

Priority: ➖ Normal

Change: Bug fix · Severity of issue fixed: Medium

Merge Risk: ⚪ Minimal · up to e04c6

The change preserves source-authored Markdown breaks while preventing wrapper-created breaks from changing rendered content. No concrete merge-blocking issue remains; proceed with normal checks.

🚥 Pre-merge checks | ✅ 14 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Developer Documentation	⚠️ Warning	Correct the stale developer-guide statement before merging. The guide documents join_touching_fragments and the new trailing-space rule, and the architecture guide and ADR contain matching updates. …	Replace the old sentence near the render_line description with wording that states: wrapper-broken non-final lines lose all trailing spaces, while source-authored trailing spaces are preserved on the final line or on explicitly preserved …

✅ Passed checks (14 passed)

Check name	Status	Explanation
Title check	✅ Passed	Accept the title: it clearly describes the source-whitespace wrapping fix and references issue #561.
Description check	✅ Passed	Accept the description: it directly explains the wrapping fix, implementation, tests, documentation, and issue #561.
Linked Issues check	✅ Passed	Accept the coding requirements in #561. Join adjacent inline fragments when their seam has no source whitespace, so links, code spans, punctuation, and emphasis remain whole. Trim trailing spaces from…
Out of Scope Changes check	✅ Passed	Accept the change set as within scope. The implementation directly prevents wrapper-created breaks at non-whitespace seams. The tests verify the linked behaviour. The documentation explains the wrappi…
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 18 functions across 4 files. (3 skipped: 3…
Testing (Overall)	✅ Passed	Pass the testing check. The new tests exercise the changed behaviour through real wrapping paths. src/wrap/tests/inline_wrapping.rs checks that wrapper-created breaks remove all trailing spaces. `te…
User-Facing Documentation	✅ Passed	Pass the documentation check. docs/users-guide.md now documents the --wrap behaviour: breaks occur only at source whitespace, touching runs remain intact even when they exceed the target width, an…
Module-Level Documentation	✅ Passed	Keep the check passing. Every Rust module introduced or changed by the pull request has module-level //! documentation. The new touching module clearly states its purpose, explains its utility, an…
Testing (Unit And Behavioural)	✅ Passed	The pull request adds meaningful coverage at both required levels. Unit coverage checks trimming at consecutive whitespace breaks and preserves source hard breaks. Integration coverage exercises `wrap…
Testing (Property / Proof)	✅ Passed	PASS: The change introduces a wrapping invariant over many fragment shapes and widths. The PR adds a substantive proptest property in tests/issue_561_wrap_never_breaks_without_whitespace.rs; it ge…
Testing (Compile-Time / Ui)	✅ Passed	Pass this check. The PR has no compile-time API behaviour that requires a trybuild test. It adds a focused CLI snapshot for the reported wrapping cases, including touching runs, trimmed wrapper breaks…
Unit Architecture	✅ Passed	Pass this check. The changed production code keeps the new behaviour as pure transformations: join_touching_fragments reads fragment text and returns new fragments, and render_line returns rendere…
Domain Architecture	✅ Passed	Pass the Domain Architecture check. The change remains within the Markdown wrapping core under src/wrap/inline; join_touching_fragments and render_line use only source text, fragment state, Unic…
Observability	✅ Passed	Pass the observability check. The change alters deterministic local Markdown wrapping in wrap_text and the --wrap CLI output. It does not add a process, service, storage, queue, network, retry, ca…

Full details: Developer Documentation

Explanation

Correct the stale developer-guide statement before merging. The guide documents join_touching_fragments and the new trailing-space rule, and the architecture guide and ADR contain matching updates. However, docs/developers-guide.md still states that non-final lines may retain a hard-break double space. The changed render_line implementation now removes every trailing space from every non-final wrapper line. This contradiction means the changed behaviour is not clearly documented.

Resolution

Replace the old sentence near the render_line description with wording that states: wrapper-broken non-final lines lose all trailing spaces, while source-authored trailing spaces are preserved on the final line or on explicitly preserved source hard-break lines. Reconcile the adjacent hard-break constraint and any related render_line documentation so the developer guide has one consistent rule.

---

_{Fragments meet where spaces end,
The wrapper keeps each joined run whole.
New breaks leave no trailing spaces,
Source hard breaks keep their role.
Tests check the wrap, then wrap once more,
And find the same text as before.}

_{Comment @coderabbitai help to get the list of available commands.}

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Reviewer's Guide

The PR changes inline wrapping to treat source whitespace as the only legal break boundary by joining all fragments that touch without whitespace, removes trailing spaces from wrapper-created lines while preserving source hard breaks, and adds documentation plus broad regression and property-based coverage.

Sequence diagram for safe inline line wrapping

sequenceDiagram
    participant Tokens
    participant Builder as build_fragments
    participant Joiner as join_touching_fragments
    participant Wrapper as textwrap
    participant Renderer as render_line
    Tokens->>Builder: build_fragments(tokens)
    Builder->>Joiner: join_touching_fragments(fragments)
    Joiner->>Joiner: Read whitespace at each fragment seam
    Joiner-->>Wrapper: Joined touching fragments
    Wrapper->>Renderer: Render wrapped line
    alt wrapper-created line
        Renderer->>Renderer: Trim trailing spaces
    else final source line
        Renderer-->>Renderer: Preserve source trailing spaces
    end

Loading

Flow diagram for whitespace-only inline wrapping

flowchart LR
    A["Inline tokens"] --> B["build_fragments"]
    B --> C["join_touching_fragments"]
    C --> D["Whitespace fragments are break opportunities"]
    D --> E["textwrap wrapping"]
    E --> F["render_line"]
    F --> G["Trim trailing spaces on wrapper-broken lines"]
    F --> H["Preserve source trailing spaces on final line"]

Loading

File-Level Changes

Change	Details	Files
Constrain inline wrapping to source whitespace and normalize wrapper-created line endings.	Added a post-grouping pass that merges adjacent fragments when their seam contains no whitespace, using seam text rather than fragment kinds. Ensured only whitespace fragments remain as wrap opportunities, allowing overlong runs with no source whitespace to remain intact. Trimmed all trailing spaces from non-final lines produced by wrapping while preserving source trailing spaces on the final line.	src/wrap/inline/touching.rs src/wrap/inline.rs
Documented the new wrapping and trailing-space semantics for users and maintainers.	Described the touching-fragment merge and its rationale in the developers' guide. Documented that wrapper-created breaks cannot retain trailing spaces and that wrapping occurs only at source whitespace. Added the issue reference and clarified preservation of source hard breaks.	docs/developers-guide.md docs/trailing-spaces.md docs/users-guide.md
Added regression coverage for all reported shapes, hard-break behavior, and the generalized invariant.	Updated the repeated-whitespace regression to require trimmed spaces at wrapper-created breaks. Added fixed cases for touching Markdown constructs, punctuation mirroring, double-space wrapping, and source hard-break preservation. Added property-based tests covering generated glued syntax, trailing-space removal, rendered-word preservation, and wrapping idempotence. Corrected the spanning-code-span snapshot so a non-whitespace seam remains intact.	src/wrap/tests/inline_wrapping.rs tests/issue_561_wrap_never_breaks_without_whitespace.rs tests/snapshots/spanning_code_span_-.snap

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#561	Make --wrap break lines only at whitespace already present in the source, keeping runs of non-whitespace characters intact even when they exceed the target width.	✅
#561	Prevent wrapping from changing rendered Markdown content, including avoiding inserted soft-break spaces, lost emphasis, and unintended hard breaks from trailing spaces.	✅
#561	Document and regression-test the wrapping invariants and all reported issue shapes, including idempotence and preservation of source hard breaks.	✅

Possibly linked issues

• --wrap breaks lines where the source has no whitespace, changing rendered text #561: PR explicitly fixes --wrap breaks lines where the source has no whitespace, changing rendered text #561 by joining touching fragments, preserving rendered content, and adding comprehensive regression tests.

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Reviewed commit: 49c9d8da4c

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Inline comments:
Review comments at @tests/issue_561_wrap_never_breaks_without_whitespace.rs:
- Line 25: Update the `wrap` helper in the regression tests to use
`mdtablefix::process::WRAP_COLS` instead of the hard-coded boundary, importing
the constant as needed so the tests track the production wrap limit.

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[leynos]

@coderabbitai thank you for the approval at e04c67ed. Main moved (#568), so I rebased this branch onto 063b454, and the head is now 6028355887edc99474bb03ea05cc66f93abc8151. The only conflict was in CHANGELOG.md, where #568's Unreleased entry and this one were added at the same place; both are kept. 6028355 also acts on the Developer Documentation warning. The render_line paragraph in docs/developers-guide.md no longer says non-final lines may keep a hard-break double space. It now states one rule: every line the wrapper breaks loses all trailing spaces, and only a segment's final line keeps the source's. That is where a source hard break sits, because the paragraph writer ends a segment at each one. The hard-break constraint later in the guide says the same.

The full gate passes at this head: make check-fmt, markdownlint, nixie, test, lint, typecheck, verus, verus-selftest and verus-mutation.

At this head, is the pre-merge table clean, and is any thread still open on its merits? If it is clean, please approve this head, since the rebase voided the earlier approval.

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🧩 Analysis chain

🏁 Script executed:

#!/bin/bash
set -uo pipefail
echo 'HEAD AND BASE'
git rev-parse HEAD
git status --short
gh pr view 570 --repo leynos/mdtablefix --json number,headRefOid,baseRefOid,mergeable,mergeStateStatus,reviewDecision,statusCheckRollup,latestReviews,commits --jq '{number,headRefOid,baseRefOid,mergeable,mergeStateStatus,reviewDecision,statusCheckRollup,latestReviews,commits:[.commits[]|{oid,messageHeadline}]}'
echo 'CHANGED FILES'
git diff --name-status 063b454...HEAD
echo 'REBASE COMMIT'
git show --stat --oneline 6028355887edc99474bb03ea05cc66f93abc8151
echo 'REVIEW THREADS'
gh api graphql -F owner=leynos -F name=mdtablefix -F number=570 -f query='query($owner:String!,$name:String!,$number:Int!){repository(owner:$owner,name:$name){pullRequest(number:$number){reviewThreads(first:100){pageInfo{hasNextPage,endCursor}nodes{id,isResolved,isOutdated,path,line,comments(first:30){nodes{author{login}body url createdAt}}}}}}}' --jq '.data.repository.pullRequest.reviewThreads'

Length of output: 14259

---

🏁 Script executed:

#!/bin/bash
set -uo pipefail
echo 'DOC AND CHANGELOG DIFF'
git diff 063b454...HEAD -- docs/developers-guide.md CHANGELOG.md
echo 'RELEVANT DOC CONTEXT'
rg -n -C7 'render_line|hard.break|trailing spaces|trailing whitespace' docs/developers-guide.md | head -170
echo 'PR DISCUSSION ON TABLE / DOCUMENTATION'
gh api --paginate 'repos/leynos/mdtablefix/issues/570/comments?per_page=100' --jq '.[] | select(.body|test("pre-merge|Developer Documentation|documentation warning|approval|hard.break";"i")) | {user:.user.login,body:.body,html_url:.html_url}'
echo 'CHANGED CODE OUTLINE'
ast-grep outline src/wrap/inline.rs --items all
ast-grep outline src/wrap/inline/touching.rs --items all
echo 'CORE DIFF'
git diff 063b454...HEAD -- src/wrap/inline.rs src/wrap/inline/touching.rs

Length of output: 50767

---

@leynos, the pre-merge table is clean on its merits at 6028355887edc99474bb03ea05cc66f93abc8151. The table still displays its earlier Developer Documentation warning, but the current docs/developers-guide.md states the rule correctly: wrapper-broken lines lose all trailing spaces, and a segment’s final line retains source trailing spaces. The hard-break constraint agrees with that rule.

The rebase retains both Unreleased changelog entries. GitHub reports CLEAN and MERGEABLE; its reported checks passed or were skipped. Both review threads are resolved, and none remains open on its merits. Approve this head.

Thanks for clarifying how the paragraph writer handles source hard breaks.

---

✏️ Learnings added

Learnt from: leynos
URL: https://github.com/leynos/mdtablefix/pull/570

Timestamp: 2026-09-28T13:11:18.310Z
Learning: In `leynos/mdtablefix`, the paragraph writer ends a wrapped segment at each source-authored Markdown hard break. In `src/wrap/inline.rs`, `render_line` removes all trailing spaces from wrapper-broken non-final lines and preserves source-authored trailing spaces on the segment's final line. `docs/developers-guide.md` documents this rule in its `render_line` description and hard-break constraint.

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✅ Action performed

Comments resolved and changes approved.