verify-references

name	verify-references
description	Verify citations, BibTeX entries, and References sections in lecture files

Verify the citation integrity of one or more lecture files. If no specific file is given, check all lecture .md files in book/.

Steps

1. Collect all lecture files

Glob for book/*//*.md to find all lecture markdown files.

2. For each lecture file, check:

a. References section exists

• The file must end with a ## References section
• That section must contain a {bibliography} directive with :filter: docname in docnames
• Flag any lecture file missing this section

b. All citations have BibTeX entries

• Find all {cite} directives in the file (patterns: {cite}`Key`, {cite}`Key1,Key2`, {cite:t}`Key`, {cite:p}`Key`)
• Extract each citation key
• Verify each key exists in book/references.bib
• Report any citation keys that have no matching BibTeX entry

c. BibTeX entry quality

• For each referenced BibTeX entry, check:
  • Has a doi field (warn if missing, suggest % TODO: verify DOI comment)
  • Has standard fields for its type (article: author, title, journal, year; book: author, title, publisher, year)
  • Key follows AuthorYear or AuthorYearLetter format

3. Check for orphaned BibTeX entries

• Scan all lecture files for citation keys actually used
• Compare against all keys in references.bib
• Report entries in references.bib that are never cited (informational, not an error)

4. Output a summary report

Format:

=== Citation Verification Report ===

Lectures checked: N

ERRORS (must fix):
- [file]: Citation `Key` not found in references.bib
- [file]: Missing ## References section

WARNINGS (should fix):
- [file]: BibTeX entry `Key` missing DOI field
- references.bib: Entry `Key` is never cited

OK: N lectures pass all checks