check-multipart-exercises.yml

Diff-scoped check that fails a pull request which adds or revises an exercise holding more than one part. The lab’s rule (Ezra, 2026-10-22) is to split every multi-part exercise into separate divs, each with its own solution. This implements gha#1156.

An exercise is a fenced div whose id starts with exr-. The check reports an exercise that holds either:

two or more list items in the same marker style, such as (a)/(b), a./b., (i)/(ii) or 1./2., bare or bolded;
inline parts in running text, such as “(a) first, (b) second”.

A pull request is checked when it adds a line inside the exercise, so a one-line fix to an old multi-part exercise is reported too. The finding sits on the line of the second part.

The check does not count:

anything inside a code fence, an HTML comment or a display-math block;
inline math, so $f(a)$ is not a part;
bullet lists, which Let: and Assume: lists use;
an exercise that holds the comment , for example the options of a single-choice question.

An exercise the pull request does not touch is never reported. With no base to diff against, the check skips instead of scanning the whole tree. It fails by default; fail: false gives warning annotations only.

Inputs

Input	Default	Meaning
`globs`	`*.qmd`	Git pathspecs of tracked files to check (recursive)
`paths-ignore`	none	Comma or newline separated globs to skip
`fail`	`true`	Fail on a finding; `false` warns
`whole-tree`	`false`	Scan every exercise, to measure a corpus
`python-version`	`3.x`	Python version

Usage

Copy examples/check-multipart-exercises.yml to .github/workflows/check-multipart-exercises.yml.