Bibfish

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Changed
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- Bibfish will now ignore commented out lines in the manuscript file.

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Added
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- Support for crossrefs. Cross-referenced Bibtex entries will be extracted automatically and placed in the output bib file.

- New `drop-fields` option, which allows you to drop Bibtext fields in the output bib file (e.g., abstracts, filenames, notes, and other unwanted data).

Changed
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- If multiple master files are specified and there are duplicate citekeys, earlier bib files will now take priority over later files.

- Bibfish is now fixed to version 1.4.1 of Bibtexparser to avoid potential issues with the upcoming version 2 release.

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Fixed
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- Bibfish will now explicitly ignore bracketed text between a cite command and the citekey to avoid issues in which bracketed text might contain braces that are erroneously captured as the citekey, e.g., `\cite[some \textit{italic} text]{myCiteKey}`.

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Added
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- bibfish can now handle multiple bibtex databases with the --bib option, which may be useful if you maintain separate databases.

Changed
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- bibfish now uses bibtexparser. This permits more robust parsing of bibtex files and produces more consistent bibtex output.

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Added
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- Added support for nested input files.

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Changed
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- Ignore empty cite commands.