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Fix #807: helpmojo flattens nested lists in javadoc - #1259
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HtmlToPlainTextConverter.FormattingVisitor appended "\n * " for every <li> regardless of nesting depth, and its cleanup step collated any run of spaces -- including indentation meant to show nesting -- down to one. A nested <ul>/<li> structure in a Mojo's or parameter's javadoc always rendered as one flat bullet level in the plain-text output used by mvn <plugin>:help, losing the nesting the javadoc author intended. FormattingVisitor now tracks <ul>/<ol> nesting depth and indents each <li> accordingly, using a placeholder character for the indentation spaces so the existing space-collation cleanup doesn't erase it -- the placeholder is only expanded to real spaces as the last step of toString(). Added tests for a single-level list (unchanged output), a nested list, and a doubly-nested list.
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Clean, minimal fix for a real bug — LGTM.
What the fix does: FormattingVisitor now tracks <ul>/<ol> nesting depth and indents each <li> with (depth - 1) spaces. A U+0001 placeholder is used for indentation spaces so the existing space-collation cleanup in toString() doesn't erase them; the placeholder is only expanded to real spaces as the last step.
Correctness verified:
- The
toString()replacement ordering is essential and correct:replaceAll(" +", " ")collapses real spaces →replace("\n ", "\n")strips leading spaces after newlines →replace(INDENT_MARKER, " ")expands markers last. Any other order would corrupt the output. U+0001is a C0 control character that cannot appear in Java identifiers or normal javadoc — collision risk is effectively zero.- Top-level list output (
depth=1) is identical to the old code: old code appended"\n * "thentoString()stripped the leading space viareplace("\n ", "\n")→"\n* "; new code appends"\n* "directly. Math.max(0, listDepth - 1)on decrement is reasonable defensive coding for malformed HTML.
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Fixes #807.
HtmlToPlainTextConverter.FormattingVisitor appended "\n * " for every
/- structure in a Mojo's or parameter's javadoc always rendered as one flat bullet level in the plain-text output used by mvn :help, losing the nesting the javadoc author intended.
FormattingVisitor now tracks
/
nesting depth and indents each- accordingly, using a placeholder character for the indentation spaces so the existing space-collation cleanup doesn't erase it -- the placeholder is only expanded to real spaces as the last step of toString(). Added tests for a single-level list (unchanged output), a nested list, and a doubly-nested list. Full module suite, checkstyle and spotless pass locally.
- I hereby declare this contribution to be licensed under the Apache License Version 2.0, January 2004
- I hereby declare that I have filed an Apache Individual Contributor License Agreement.
To make clear that you license your contribution under the Apache License Version 2.0, January 2004, check one of the following: