Add support for biblatex-chicago (#12240)

File format change
2024-11-21 17:51:03 +00:00 · 2024-07-09 15:18:06 +02:00 · 2024-07-09 15:18:06 +02:00 · 8941b05774
commit 8941b05774
parent a4b99aee94
11 changed files with 828 additions and 54 deletions
--- a/development/FORMAT
+++ b/development/FORMAT
@ -7,6 +7,10 @@ changes happened in particular if possible. A good example would be

 -----------------------

+2024-07-09 Jürgen Spitzmüller <spitz@lyx.org> 
+	* Format incremented to 624: Add biblatex-chicago cite engine.
+	  We will revert new commands to ERT where necessary
+
 2024-06-11 Udi Fogiel <ufogiel@lyx.org>
 	* Format incremented to 623: Remove hebrew letter document class.
 	  Old documents will be mapped to regular letter document class.
--- a/lib/Makefile.am
+++ b/lib/Makefile.am
@ -2709,6 +2709,7 @@ citeenginesdir = $(pkgdatadir)/citeengines
 dist_citeengines_DATA = \
 	citeengines/basic.citeengine \
        citeengines/biblatex.citeengine \
+        citeengines/biblatex-chicago.citeengine \
        citeengines/biblatex-natbib.citeengine \
        citeengines/jurabib.citeengine \
        citeengines/natbib.citeengine
--- a/lib/citeengines/biblatex-chicago.citeengine
+++ b/lib/citeengines/biblatex-chicago.citeengine
@ -0,0 +1,421 @@
+# \DeclareLyXCiteEngine[biblatex-chicago.sty]{Biblatex (Chicago style)}
+# DescriptionBegin
+#   This Biblatex variety uses the biblatex-chicago package on top of
+#   biblatex to produce citations according to the Chicago Manual of Style.
+#   As with normal Biblatex, the use of 'biber' as Bibliography
+#   processor is advised.
+# DescriptionEnd
+
+# Author: Jürgen Spitzmüller <spitz@lyx.org>
+
+Format 106
+
+Requires biblatex-chicago
+
+# The framework (biblatex|bibtex)
+CiteFramework biblatex
+
+# Cite style variants (default|authoryear|natbib)
+# We provide authoryear and notational citations
+CiteEngineType authoryear|notes
+
+# Default style files for either engine type
+DefaultBiblio  authoryear:authoryear|notes:notes
+
+# Maximum number of names before "et al." chimes in
+MaxCiteNames 3
+
+
+# The syntax of the cite command definitions below is:
+# LyXName|alias*<!_stardesc!_stardesctooltip>[][]=latexcmd
+# 
+# * LyXName:  The LyX name as output in the LyX file. For
+#             portability reasons, we try to use the same
+#             name for same-formatted commands in the
+#             different engines (thus many names stem from
+#             natbib).
+# * Alias:    A (comma-separated) list of commands that fall
+#             back to the given LyX name in the current engine.
+#             This is a bit like "ObsoletedBy" in the layouts.
+# * latexcmd: The actual LaTeX command that is output.
+#
+# Alias and latexcmd are optional. If no latexcmd is given, the
+# LyXName will be output to LaTeX.
+#
+# Note further:
+#
+# * The LyXName "keyonly" has a special meaning: only the citation key,
+#   without any latex command, is output.
+# * Capitalization indicates that the command also has a capitalized
+#   form (\Latexcmd vs. \latexcmd). These usually enforce upcasing of
+#   name prefixes (von Goethe => Von Goethe).
+# * Brackets [] indicate the number of optional arguments (0, 1, 2).
+# * The star * indicates there is a starred version of the command
+#   (\latexcmd* vs. \latexcmd). By default, the starred version means:
+#   Expand the author list even if the maxnames setting would cause
+#   BibTeX/Biber to shorten it with "et al.".
+#   If the star has a different meaning for a command, it can be
+#   specified in angle brackets: <!_stardesc!_stardesctooltip>.
+#   Maximal two translatable macro keywords, marked by the prefix '!_',
+#   can be given. The first points to the string that replaces the
+#   "Full aut&hor list" checkbox label in the Citation dialog, the
+#   second one an optional tooltip for this checkbox. Note that these
+#   two macros have to be defined in the CiteFormat section (see below),
+#   dropping the '!' from the prefix (see below), e.g.:
+#   _stardesc Starred command label
+#   _stardesctooltip Tooltip for the starred command checkbox.
+# * A trailing $ indicates that a command features "qualified citation
+#   lists" (a specific Biblatex feature)
+
+#
+# CITE COMMAND DEFINITIONS for either engine type
+#
+
+CiteEngine authoryear
+	Cite$|citealt,citealp,smartcite[][]
+	Citet$[][]=textcite
+	Gentextcite$[][]
+	Citep$[][]=parencite
+	Citeauthor*<!_citeauthorstar!_citeauthorstartooltip>[][]
+	citeyearpar[][]=parencite*
+	citeyear[][]=cite*
+	citebyear[][]=citeyear
+	Footcite$[][]
+	Autocite$[][]
+	atcite
+	atpcite
+	citetitle*<!_citetitlestar!_citetitlestartooltip>[][]
+	fullcite[][]
+	footfullcite[][]
+	nocite
+	keyonly
+End
+
+CiteEngine notes
+	cite$|parencite,citep,citealt,citealp*<!_citestar!_citestartooltip>[][]
+	Citet$[][]=textcite
+	Gentextcite$[][]
+	Citep$[][]=parencite
+	Footcite$[][]=smartcite
+	Autocite$[][]
+	Citeauthor*<!_citeauthorstar!_citeauthorstartooltip>[][]
+	citeyear[][]=citeyear*
+	citebyear[][]=citeyear
+	Citetitle$*<!_citetitlestar!_citetitlestartooltip>[][]
+	fullcite[][]
+	shortcite*<!_shortcitestar!_shortcitestartooltip>[][]
+	shortrefcite[][]
+	shorthandcite*<!_shortcitestar!_shortcitestartooltip>[][]
+	shorthandrefcite[][]
+	footfullcite[][]
+	citejournal[][]
+	Headlesscite$[][]
+	headlessfullcite$[][]
+	surnamecite[][]
+	nocite
+	keyonly
+End
+
+
+#
+# CITE FORMAT
+#
+
+# The following defines how the commands are represented in the GUI
+# (inset button and citation dialog) as well as in XHTML, docbook and
+# plain text output.
+#
+# There are common definitions (default) and specific definitions for
+# either cite engine type (which overwrite existing defaults.
+#
+
+# Input standard format definitions for the bibliography
+Input stdciteformats.inc
+
+CiteFormat default
+	#
+	# MACROS
+	#
+	# 1. Translatable bits (need to be marked by _ prefix, if translated to the GUI language,
+	#    or B_, if translated to the buffer language)
+	#    Note that preceding and trailing spaces matter.
+	#
+	_notcited not cited
+	_addtobib Add to bibliography only.
+	_keyonly Key only.
+	_key Key
+	_footnote Footnote
+	_foot Foot
+	_fullcite bibliography entry
+	_bibentry Full bibliography entry.
+	_autocite Autocite
+	_auto Auto
+	# GUI strings for the starred commands
+	_citeauthorstar S&horten author list[[Possible substitute to All aut&hors]]
+	_citeauthorstartooltip Force a short author list (using et al.)
+	_citetitlestar F&orce full title[[Possible substitute to All aut&hors]]
+	_citetitlestartooltip Use full title even if shorttitle exists
+	# The following are handled by BiblioInfo
+	B_etal  et al.
+	B_namesep , [[separate author names in citation, except for last name]]
+	B_lastnamesep , and [[separate name of last author in citation]]
+	B_pairnamesep  and [[separate two authors in citation]]
+	B_gensuffix 's[[genitive suffix for author names]]
+
+	#
+	# 2. Macros re-used in the style definitions
+	#
+	# A link that lets us jump to the bibliography entry in LyXHTML
+	# %clean:key% will be substituted by the cite key to give a unique id
+	!startlink {!<a href='#LyXCite-%clean:key%'>!}
+	!endlink {!</a>!}
+
+	# Add " , and " before the last item (but " and " if there are only two), else ", "
+	!smartsep {%second%[[{%next%[[%B_namesep%]][[%B_pairnamesep%]]}]][[{%next%[[%B_namesep%]][[%B_lastnamesep%]]}]]}
+
+	# A dummy year modifier. This just indicates that a modifier might be output,
+	# to differentiate \cite* and \citeyear
+	!dummymod [a]
+
+	# "...; Nextauthor ..."
+	!nextauthor {%next%[[%!sep% %!startlink%%!abbrvciteauthor%%!endlink%%!nextauthor%]]}
+	# Handle starred command: abbr. or full author list
+	!makenextauthor {%next%[[%!sep% %!startlink%%!makeauthor%%!endlink%%!makenextauthor%]]}
+	# "...; [NextID] ..."
+	!nextkey {%next%[[%!sep% %key%%!nextkey%]]}
+	# "...; Nextyear ..." (including extra label, as in 2017a)
+	!nextyear {%next%[[%!sep% %!startlink%%!year%%!endlink%%!nextyear%]]}
+	# "...; Nextyear ..." (including emulated extra label, as in 2017[a])
+	!nextshmyear {%next%[[%!sep% %!startlink%%!shmyear%%!endlink%%!nextshmyear%]]}
+	# "...; Nextyear ..." (without any extra label)
+	!nextbyear {%next%[[%!sep% %!startlink%%!byear%%!endlink%%!nextbyear%]]}
+	# "...; Nexttitle ..." 
+	!makenexttitle {%next%[[%!sep% %!startlink%%!maketitle%%!endlink%%!makenexttitle%]]}
+	# "...; NextKey..."
+	!nextfullcite {%next%[[%!sep% %bibentry%%!nextfullcite%]]}
+
+	# "Author et al." (if > 3 authors) or "??"
+	!abbrvciteauthor {%abbrvciteauthor%[[%abbrvciteauthor%]][[??]]}
+	# "Author et al." (always) or "??"
+	!forceabbrvciteauthor {%forceabbrvciteauthor%[[%forceabbrvciteauthor%]][[??]]}
+	# Handle starred command: force of abbr. author list, independent of maxcitenames
+	!makeauthor {%ifstar%[[%!forceabbrvciteauthor%]][[%!abbrvciteauthor%]]}
+	# "prenote "
+	!textbefore {%textbefore%[[%textbefore% ]]}
+	# ", postnote"
+	!textafter {%textafter%[[, %textafter%]]}
+	# "prenote " (for qualified lists)
+	!ctextbefore {%curpretext%[[%curpretext% ]]}
+	# ", postnote" (for qualified lists)
+	!ctextafter {%curposttext%[[, %curposttext%]]}
+	# Add a year if it exists (else "??") and possibly a modifier (as in 2017a)
+	!year {%year%[[%year%]][[??]]}{%modifier%[[%modifier%]]}
+	# Add a year if it exists (else "??") and indicate a possible modifier (as in 2017[a])
+	!myear {%year%[[%year%]][[??]]}{%modifier%[[%modifier%]][[{%export%[[]][[%!dummymod%]]}]]}
+	# Add a shorthand if it exists else myear (see above)
+	!shmyear {%shorthand%[[%shorthand%]][[%!myear%]]}
+	# Add a year if it exists (else "??") without any modifier at all
+	!byear {%year%[[%year%]][[??]]}
+	# Add a shorttitle or title if it exists (else "??")
+	!makeshorttitle {%shorttitle%[[%shorttitle%]][[{%title%[[%title%]][[??]]}]]}
+	# Add a title (or "??")
+	!maketitle {%ifstar%[[{%title%[[%title%]][[??]]}]][[%!makeshorttitle%]]}
+	# "cf. Key..."
+	!fullcite %!startlink%%bibentry%%!endlink%%!nextfullcite%
+
+	#
+	# ACTUAL STYLE DEFINITIONS
+	#
+	# (identical in authoryear and numerical)
+	#
+
+	# "cf. Author; Nextautor, p. xx"
+	citeauthor %!textbefore%%!startlink%%!makeauthor%%!endlink%%!makenextauthor%%!textafter%
+	# "cf. Year; Nextyear, p. xx" (including extra label, as in 2017a)
+	citeyear %!textbefore%%!startlink%%!shmyear%%!endlink%%!nextshmyear%%!textafter%
+	# "cf. Year; Nextyear, p. xx" (without any extra label)
+	citebyear %!textbefore%%!startlink%%!byear%%!endlink%%!nextbyear%%!textafter%
+	# "cf. Title; Nexttitle, p. xx" (without any extra label)
+	citetitle %!textbefore%%!startlink%%!maketitle%%!endlink%%!makenexttitle%%!textafter%
+	# "Bibliography entry." (dialog) / "cf. Key; NextKey..., p. xx (bibliography entry)" (button)
+	fullcite {%dialog%[[%_bibentry%]][[%!textbefore%{%label%[[%!fullcite%]][[%key%%!nextkey% (%_fullcite%)]]}%!textafter%}]]}
+	# "Footnote: Full bibliography entry." (dialog) / "Foot: Key (bibliography entry)"
+	footfullcite {%dialog%[[%_footnote%]][[%_foot%]]}: {%dialog%[[%_bibentry%]][[{%label%[[%!fullcite%]][[%key%%!nextkey% (%_fullcite%)]]}]]}
+	# "Add to bibliography only." (dialog) / "[ID] (not cited)" (button)
+	nocite {%dialog%[[%_addtobib%]][[%key%%!nextkey% (%_notcited%)]]}
+	# Output only the key
+	keyonly {%dialog%[[%_keyonly%]][[%_key%: %key%%!nextkey%]]}
+End
+
+CiteFormat authoryear
+	#
+	# MACROS
+	#
+	!open (
+	!sep ;
+	!close )
+
+	# "cf. Author et. al Year..."
+	!makecite %!ctextbefore%%!startlink%%!abbrvciteauthor% %!year%%!endlink%%!ctextafter%%!nextcite%
+	# Author et al. (cf. Year...
+	!maketextcite {%ifqualified%[[%!textbefore%]]}%!startlink%%!abbrvciteauthor%%!endlink% %!open%{%ifqualified%[[%!ctextbefore%]][[%!textbefore%]]}%!year%%!ctextafter%%!nexttextcite%
+	# Author's et al. (cf. Year...
+	!makegentextcite {%ifqualified%[[%!textbefore%]]}%!startlink%%!abbrvciteauthor%%B_gensuffix%%!endlink% %!open%{%ifqualified%[[%!ctextbefore%]][[%!textbefore%]]}%!year%%!ctextafter%%!nextgentextcite%
+	# "cf. Author et. al Title..."
+	!maketcite %!ctextbefore%%!startlink%%!abbrvciteauthor%{%title%[[, %title%]]}%!endlink%%!ctextafter%%!nexttcite%
+
+	# "...; Nextauthor Year..."
+	!nextcite {%next%[[%!sep% %!makecite%]]}
+	# "...; Nextauthor Title..."
+	!nexttcite {%next%[[%!sep% %!maketcite%]]}
+	# "...); Nextauthor (Year..."
+	!nexttextcite {%next%[[%!close%%!smartsep%%!startlink%%!abbrvciteauthor%%!endlink% %!open%%!ctextbefore%%!year%%!ctextafter%%!nexttextcite%]]}
+	# "...); Nextauthor's (Year..."
+	!nextgentextcite {%next%[[%!close%%!smartsep%%!startlink%%!abbrvciteauthor%%B_gensuffix%%!endlink% %!open%%!ctextbefore%%!year%%!ctextafter%%!nexttextcite%]]}
+
+	# Add a year if it exists (else title, else "??") and possibly a modifier (as in 2017a)
+	!yeartitle {%year%[[%year%{%modifier%[[%modifier%]][[{%export%[[]][[%!dummymod%]]}]]}]][[{%title%[[%title%]][[??]]}]]}
+	# Add a shorthand if it exists, else yeartitle (above)
+	!shyeartitle {%shorthand%[[%shorthand%]][[%!yeartitle%]]}
+	# "...; Shorthand|Nextyear ..." (including extra label, as in 2017a)
+	!nextshyeartitle {%next%[[%!sep% %!startlink%%!yeartitle%%!endlink%%!nextshyeartitle%]]}
+
+	#
+	# ACTUAL STYLE DEFINITIONS
+	#
+	# (additions and modifications to default)
+	#
+
+	# "cf. Author A Year; Author B Year, p. xx"
+	cite %!textbefore%%!makecite%%!textafter%
+	# "cf. Author A (Year),[ and] Author B (Year, p. xx)"
+	citet %!maketextcite%%!textafter%%!close%
+	# "cf. Author A (Year),[ and] Author B (Year, p. xx)"
+	gentextcite %!makegentextcite%%!textafter%%!close%
+	# "(cf. Author A Year; Author B Year, p. xx)"
+	citep %!open%%!textbefore%%!makecite%%!textafter%%!close%
+	# This prints year or title, if year is missing
+	citeyear %!textbefore%%!startlink%%!shyeartitle%%!endlink%%!nextshyeartitle%%!textafter%
+	# "(cf. Year; Nextyear, p. xx)"
+	citeyearpar %!open%%!textbefore%%!startlink%%!shmyear%%!endlink%%!nextshmyear%%!textafter%%!close%
+	# "Footnote: cf. Author A Year; Author B Year, p. xx."
+	footcite {%dialog%[[%_footnote%]][[%_foot%]]}: %!textbefore%%!makecite%%!textafter%.
+	# "Auto: (cf. Author A Year; Author B Year, p. xx)"
+	autocite {%dialog%[[%_autocite%]][[%_auto%]]}: %!open%%!textbefore%%!makecite%%!textafter%%!close%
+	# "cf. Author A Title; Author B Title, p. xx"
+	atcite %!textbefore%%!maketcite%%!textafter%
+	# "cf. Author A Title; Author B Title, p. xx"
+	atpcite %!open%%!textbefore%%!maketcite%%!textafter%%!close%
+End
+
+CiteFormat notes
+	#
+	# MACROS
+	#
+	# 1. Translatable bits (need to be marked by _ prefix, if translated to the GUI language,
+	#    or B_, if translated to the buffer language)
+	#
+	_super Super
+	_superscript Superscript
+	_innote + footnote: full or abbr. bib. entry
+	_facite full or abbr. bib. entry
+	_fabibentry Full or abbreviated bibliography entry.
+	_hlcite full or abbr. bib. entry w/o author
+	_hlbibentry Full or abbreviated bibliography entry without author.
+	_shortcite abbr. bib. entry
+	_scbibentry Abbreviated bibliography entry.
+	_hlfcite full bib. entry w/o author
+	_hlfbibentry Full bibliography entry without author.
+	_sncite full or abbr. bib. entry w/o prenames
+	_snbibentry Full or abbreviated bibliography, omit prenames.
+	_noibid No ibidem tracking
+	_noib No ibid.
+	_citestar No &ibidem tracking[[Possible substitute to All aut&hors]]
+	_citestartooltip Disable ibidem tracking for this entry
+	_shortcitestar No &back reference[[Possible substitute to All aut&hors]]
+	_shortcitestartooltip Disable page tracking for this entry to prevent back references (with option "noteref")
+	_shortrefcite abbr. bib. entry w/ back ref.
+	_shortrefcitedialog Abbreviated bib. entry (enforce back reference)
+	_shorthandrefcite (w/ back ref.)
+	_shorthandrefcitedialog (enforce back reference)
+	_noshorthand ??? (no shorthand!)
+	_nojtitle ??? (no journal title!)
+
+	#
+	# 2. Macros re-used in the style definitions
+	#
+	!open [
+	!sep ,
+	!close ]
+
+	# "Full or abbreviated bibliography entry." (dialog) / "cf. Key; NextKey..., p. xx (full or abbr. bib. entry)" (button)
+	!makecite {%dialog%[[%_fabibentry%]][[%!textbefore%%key%%!nextkey% (%_facite%)%!textafter%]]}
+	# Author et al. [cf. Year...
+	!maketextcite %!startlink%%!abbrvciteauthor%%!endlink%{%dialog%[[]][[ %!open%%!textbefore%%!ctextbefore%%!year%%!ctextafter%]]}%!nexttextcite%
+	# Author et al.'s (cf. Year...
+	!makegentextcite %!startlink%%!abbrvciteauthor%%B_gensuffix%%!endlink%{%dialog%[[]][[ %!open%%!textbefore%%!ctextbefore%%!year%%!ctextafter%]]}%!nextgentextcite%
+	# "(Full or abbreviated bibliography entry.)" (dialog) / "(cf. Key; NextKey..., p. xx [full or abbr. bib. entry])" (button)
+	!makecitep ({%dialog%[[%_fabibentry%]][[%!textbefore%%key%%!nextkey% %!open%%_facite%%!close%%!textafter%]]})
+	#
+	!makejtitle %!startlink%%!abbrvciteauthor%%!endlink%%!sep% {%journal%[[%!emphjournal% X]][[{%journaltitle%[[%!emphjournal% Y]][[%_nojtitle%,]]}{%volume%[[ %volume%]]}]]}%!makenextjtitle%
+	# "Full or abbreviated bibliography entry without author." (dialog) / "cf. Key; NextKey..., p. xx (full or abbr. bib. entry w/o author)" (button)
+	!makehlcite {%dialog%[[%_hlbibentry%]][[%!textbefore%%key%%!nextkey% (%_hlcite%)%!textafter%]]}
+	# "Full bibliography entry without author." (dialog) / "cf. Key; NextKey..., p. xx (full bib. entry w/o author)" (button)
+	!makehlfcite {%dialog%[[%_hlfbibentry%]][[%!textbefore%%key%%!nextkey% (%_hlfcite%)%!textafter%]]}
+	# "Abbreviated bibliography entry." (dialog) / "cf. Key; NextKey..., p. xx (abbr. bib. entry)" (button)
+	!makeshortcite {%dialog%[[%_scbibentry%]][[%!textbefore%%key%%!nextkey% (%_shortcite%)%!textafter%]]}
+	# "Abbreviated bib. entry (enforce back reference)" (dialog) / "cf. Key; NextKey..., p. xx (abbr. bib. entry w/ back ref.)" (button)
+	!makeshortrefcite {%dialog%[[%_shortrefcitedialog%]][[%!textbefore%%key%%!nextkey% (%_shortrefcite%)%!textafter%]]}
+	# Shorthand if available
+	!tryshorthand {%shorthand%[[%shorthand%]][[%_noshorthand%]]}
+	# Shorthand [cf. Year...
+	!makeshorthandcite %!textbefore%%!ctextbefore%%!startlink%%!tryshorthand%%!endlink%%!nextshorthand%
+	# Shorthand [cf. Year...
+	!makeshorthandrefcite %!makeshorthandcite% {%dialog%[[%_shorthandrefcitedialog%]][[%_shorthandrefcite%]]}
+	# "Full or abbreviated bibliography, omit prenames." (dialog) / "cf. Key; NextKey..., p. xx (full or abbr. bib. entry w/o prenames)" (button)
+	!makesncite {%dialog%[[%_snbibentry%]][[%!textbefore%%key%%!nextkey% (%_sncite%)%!textafter%]]}
+
+	# "...); Nextauthor (Year..."
+	!nexttextcite {%next%[[{%dialog%[[]][[%!close%]]}%!smartsep%%!startlink%%!abbrvciteauthor%%!endlink%{%dialog%[[]][[ %!open%%!ctextbefore%%!year%%!ctextafter%]]}%!nexttextcite%]]}
+	# "...); Nextauthor (Year..."
+	!nextgentextcite {%next%[[{%dialog%[[]][[%!close%]]}%!smartsep%%!startlink%%!abbrvciteauthor%%B_gensuffix%%!endlink%{%dialog%[[]][[  %!open%%!ctextbefore%%!year%%!ctextafter%]]}%!nexttextcite%]]}
+	# "...; Nexttitle ..." 
+	!makenextjtitle {%next%[[%!sep% %!startlink%%!makejtitle%%!endlink%%!makenextjtitle%]]}
+	# "...; NextShorthand..."
+	!nextshorthand {%next%[[%!smartsep%%!ctextbefore%%!startlink%%!tryshorthand%%!endlink%%!ctextafter%%!nextshorthand%]]}
+
+	#
+	# ACTUAL STYLE DEFINITIONS
+	#
+	# (additions and modifications to default)
+	#
+
+	# "Full or abbreviated bibliography entry." (dialog) / "cf. Key; NextKey..., p. xx (full or abbr. bib. entry)" (button)
+	cite %!makecite%
+	# "Author [cf. ...],[ and] Nextauthor [..., p. xx]"
+	citet %!maketextcite%{%dialog%[[ %_innote%]][[%!textafter%%!close%]]}
+	# "Author's [cf. ID],[ and] Nextauthor [NextID, p. xx]"
+	gentextcite %!makegentextcite%{%dialog%[[ %_innote%]][[%!textafter%%!close%]]}
+	# "(Full or abbreviated bibliography entry.)" (dialog) / "(cf. Key; NextKey..., p. xx [full or abbr. bib. entry])" (button)
+	citep %!makecitep%
+	# "Footnote: cf. ID, NextID, p. xx."
+	footcite {%dialog%[[%_footnote%]][[%_foot%]]}: %!makecite%
+	# "Auto: (cf. Author A Year; Author B Year, p. xx)"
+	autocite {%dialog%[[%_autocite%]][[%_auto%]]}: %!makecite%
+	# "cf. Author, Journal vol., NextAuthor, ..., p. xx"
+	citejournal %!textbefore%%!makejtitle%%!textafter%
+	# "Full or abbreviated bibliography entry without author." (dialog) / "cf. Key; NextKey..., p. xx (full or abbr. bib. entry w/o author)" (button)
+	headlesscite %!makehlcite%
+	# "Full bibliography entry without author." (dialog) / "cf. Key; NextKey..., p. xx (full bib. entry w/o author)" (button)
+	headlessfullcite %!makehlfcite%
+	# "Abbreviated bibliography entry." (dialog) / "cf. Key; NextKey..., p. xx (abbr. bib. entry)" (button)
+	shortcite %!makeshortcite%
+	# "Shorthand" (dialog) / "cf. Shorthand; NextShorthand..., p. xx" (button)
+	shorthandcite %!makeshorthandcite%
+	# "Abbreviated bib. entry (enforce back reference)" (dialog) / "cf. Key; NextKey..., p. xx (abbr. bib. entry w/ back ref.)" (button)
+	shortrefcite %!makeshortrefcite%
+	# "Shorthand (enforce back reference)" (dialog) / "cf. Shorthand; NextShorthand..., p. xx (abbr. bib. entry w/ back ref.)" (button)
+	shorthandrefcite %!makeshorthandrefcite%
+	# "Full or abbreviated bibliography, omit prenames." (dialog) / "cf. Key; NextKey..., p. xx (full or abbr. bib. entry w/o prenames)" (button)
+	surnamecite %!makesncite%
+End
--- a/lib/doc/UserGuide.lyx
+++ b/lib/doc/UserGuide.lyx
@ -1,4 +1,4 @@
-#LyX 2.5 created this file. For more info see https://www.lyx.org/
+#LyX 2.4 created this file. For more info see https://www.lyx.org/
 \lyxformat 620
 \begin_document
 \begin_header
@ -158,6 +158,7 @@ logicalmkup
 \docbook_table_output 0
 \docbook_mathml_prefix 1
 \author -1162675398 "Tobias Hilbricht" hilbricht@linopus.de
+\author -712698321 "Jürgen Spitzmüller"
 \author -584632292 "Richard Kimberly Heck"
 \author 5863208 "ab"
 \end_header
@ -9645,12 +9646,14 @@ Verbatim
 \end_layout

 \begin_layout Verbatim
+
 This is Verbatim.
 \end_layout

 \begin_layout Verbatim
 \noindent
 \align block
+
 The following 2 lines are empty:
 \end_layout

@ -9663,6 +9666,7 @@ The following 2 lines are empty:
 \end_layout

 \begin_layout Verbatim
+
 Almost everything is allowed in Verbatim:"%&$§#~'`
 \backslash
 }][{|
@ -9686,6 +9690,7 @@ Verbatim
 \end_layout

 \begin_layout Verbatim*
+
 This is Verbatim*.
 \end_layout

@ -33547,6 +33552,16 @@ literal "true"
 \end_inset

 .
+\change_inserted -712698321 1720530740
+
+\end_layout
+
+\begin_layout Standard
+
+\change_inserted -712698321 1720530806
+Note that the Chicago style biblatex mode has built-in citation and bibliography styles which can only be slightly adapted via the bibliography options (please refer to the package manual for details).
+\change_unchanged
+
 \end_layout

 \begin_layout Standard
@ -34013,6 +34028,85 @@ biblatex
 Options
 \family default
 field.
+\change_inserted -712698321 1720530575
+
+\end_layout
+
+\begin_layout Description
+
+\change_inserted -712698321 1720530576
+Biblatex
+\begin_inset space ~
+\end_inset
+
+(Chicago
+\begin_inset space ~
+\end_inset
+
+style) loads the package 
+\series bold
+biblatex-chicago
+\series default
+
+\begin_inset Index idx
+range none
+pageformat default
+status collapsed
+
+\begin_layout Plain Layout
+
+\change_inserted -712698321 1720530576
+\SpecialChar LaTeX
+ packages
+\begin_inset IndexMacro subentry
+status open
+
+\begin_layout Plain Layout
+
+\change_inserted -712698321 1720530576
+biblatex-chicago
+\end_layout
+
+\end_inset
+
+
+\end_layout
+
+\end_inset
+
+.
+ This is a specific variant particularly for users who want to follow the 
+\emph on
+Chicago Manual of Style
+\emph default
+.
+ Both 
+\begin_inset Flex Code
+status collapsed
+
+\begin_layout Plain Layout
+
+\change_inserted -712698321 1720530576
+authordate
+\end_layout
+
+\end_inset
+
+ and 
+\begin_inset Flex Code
+status collapsed
+
+\begin_layout Plain Layout
+
+\change_inserted -712698321 1720530576
+notes-bibliography
+\end_layout
+
+\end_inset
+
+ mode are supported.
+\change_unchanged
+
 \end_layout

 \begin_layout Description
@ -34051,6 +34145,8 @@ Biblatex
 biblatex
 \series default
 styles are also supported by this variant.
+\change_inserted -712698321 1720530371
+
 \end_layout

 \begin_layout Description
--- a/lib/doc/de/UserGuide.lyx
+++ b/lib/doc/de/UserGuide.lyx
@ -32880,6 +32880,12 @@ literal "true"
 .
 \end_layout

+\begin_layout Standard
+Beachten Sie,
+ dass der Chicago-Stil von biblatex fest vorgegebene Zitier- und Bibliographiestile voraussetzt,
+ die nur über die Zitierstil-Optionen leicht angepasst werden können (bitte konsultieren Sie die Paketdokumentation für genauere Informationen).
+\end_layout
+
 \begin_layout Standard
 Ein Querverweis auf einen Datenbankeintrag erfolgt wie in Abschnitt
 \begin_inset space ~
@ -33371,6 +33377,50 @@ Optionen
 eingeben.
 \end_layout

+\begin_layout Description
+Biblatex
+\begin_inset space ~
+\end_inset
+
+(Chicago-Stil) lädt das Paket 
+\series bold
+biblatex-chicago
+\series default
+
+\begin_inset Index idx
+range none
+pageformat default
+status collapsed
+
+\begin_layout Plain Layout
+\SpecialChar LaTeX
+-Paket
+\begin_inset IndexMacro subentry
+status open
+
+\begin_layout Plain Layout
+biblatex-chicago
+\end_layout
+
+\end_inset
+
+
+\end_layout
+
+\end_inset
+
+.
+ Dieses bietet eine spezifische Variante für Benutzer,
+ die sich nach dem 
+\emph on
+\lang english
+Chicago Manual of Style
+\emph default
+\lang ngerman
+ richten wollen.
+ Sowohl Autor-Jahr als auch Fuß-/Endnoten mit Bibliografie werden unterstützt.
+\end_layout
+
 \begin_layout Description

 \family sans
--- a/lib/lyx2lyx/lyx_2_5.py
+++ b/lib/lyx2lyx/lyx_2_5.py
@ -21,19 +21,29 @@ import re

 # Uncomment only what you need to import, please (lyx2lyx_tools):
 #    convert_info_insets, get_ert, hex2ratio, insert_to_preamble,
-#    length_in_bp, lyx2latex, lyx2verbatim, put_cmd_in_ert,
+#    length_in_bp, lyx2latex, lyx2verbatim,
 #    revert_flex_inset, revert_flex_inset, revert_font_attrs,
 #    revert_language, str2bool
-from lyx2lyx_tools import add_to_preamble, latex_length
+from lyx2lyx_tools import (
+    add_to_preamble,
+    latex_length,
+    put_cmd_in_ert
+)

 # Uncomment only what you need to import, please (parser_tools):
 #    check_token, count_pars_in_inset, del_complete_lines, del_token,
 #    del_value, find_complete_lines, find_end_of, find_end_of_layout,
 #    find_re, find_substring, find_token_backwards, find_token_exact,
 #    find_tokens, get_bool_value, get_containing_inset,
-#    get_containing_layout, get_option_value, get_quoted_value,
+#    get_containing_layout, get_option_value,
 #    is_in_inset, set_bool_value
-from parser_tools import find_end_of_inset, find_re, find_token, get_value
+from parser_tools import (
+    find_end_of_inset,
+    find_re,
+    find_token,
+    get_quoted_value,
+    get_value
+)

 ####################################################################
 # Private helper functions
@ -213,6 +223,158 @@ def convert_he_letter(document):
        document.textclass = "letter"


+chicago_local_layout = [
+    "### Inserted by lyx2lyx (biblatex-chicago) ###",
+    "Requires biblatex-chicago",
+    "### End of insertion by lyx2lyx (biblatex-chicago) ###" "",
+]
+
+def convert_biblatex_chicago(document):
+    """Convert biblatex-chicago documents"""
+    
+    chicago = document.del_local_layout(chicago_local_layout)
+    if not chicago:
+        chicago = document.del_from_header(["Requires biblatex-chicago"])
+    if not chicago:
+        return
+
+    # 1. Get cite engine
+    engine = "basic"
+    i = find_token(document.header, "\\cite_engine", 0)
+    if i == -1:
+        document.warning("Malformed document! Missing \\cite_engine")
+    else:
+        engine = get_value(document.header, "\\cite_engine", i)
+
+    # 2. If biblatex set to chicago
+    biblatex = False
+    if engine not in ["biblatex", "biblatex-natbib"]:
+        return
+
+    document.header[i] = "\\cite_engine biblatex-chicago"
+
+    i = find_token(document.header, "\\biblio_options", 0)
+    bibopts = ""
+    if i == -1:
+        val = get_value(document.header, "\\biblio_options", i)
+
+    cetype = "authoryear"
+    if bibopts.find("authordate") == -1:
+        cetype = "notes"
+
+    # 2. Set cite type
+    i = find_token(document.header, "\\cite_engine_type", 0)
+    if i == -1:
+        document.warning("Malformed document! Missing \\cite_engine_type")
+    else:
+        document.header[i] = "\\cite_engine_type %s" % cetype
+
+
+def revert_biblatex_chicago(document):
+    """Revert biblatex-chicago to ERT where necessary"""
+
+    # 1. Get and reset cite engine
+    engine = "basic"
+    i = find_token(document.header, "\\cite_engine", 0)
+    if i == -1:
+        document.warning("Malformed document! Missing \\cite_engine")
+    else:
+        engine = get_value(document.header, "\\cite_engine", i)
+        document.header[i] = "\\cite_engine biblatex"
+
+    # 2. Do we use biblatex-chicago?
+    if engine != "biblatex-chicago":
+        return
+
+    # 3. Set cite type
+    cetype = "authoryear"
+    i = find_token(document.header, "\\cite_engine_type", 0)
+    if i == -1:
+        document.warning("Malformed document! Missing \\cite_engine_type")
+    else:
+        cetype = get_value(document.header, "\\cite_engine_type", i)
+        document.header[i] = "\\cite_engine_type authoryear"
+
+    # 4. Add authordate option if needed
+    if cetype == "authoryear":
+        i = find_token(document.header, "\\biblio_options", 0)
+        if i != -1:
+            bibopts = get_value(document.header, "\\biblio_options", i)
+            if bibopts.find("authordate") != -1:
+                document.header[i] = "\\biblio_options %s" % bibopts + ", authordate"
+        else:
+            i = find_token(document.header, "\\biblio_style", 0)
+            if i == -1:
+                document.warning("Malformed document! Missing \\biblio_style")
+            else:
+                document.header[i+1:i+1] = ["\\biblio_options authordate"]
+
+    # 5. Set local layout
+    document.append_local_layout(chicago_local_layout)
+
+    # 6. Handle special citation commands
+    # Specific citation insets used in biblatex that need to be reverted to ERT
+    new_citations = {
+        "atcite": "atcite",
+        "atpcite": "atpcite",
+        "gentextcite": "gentextcite",
+        "Gentextcite": "Gentextcite",
+    }
+    if cetype == "notes":
+        new_citations = {
+            "citeyear": "citeyear*",
+            "Citetitle": "Citetitle",
+            "Citetitle*": "Citetitle*",
+            "gentextcite": "gentextcite",
+            "Gentextcite": "Gentextcite",
+            "shortcite": "shortcite",
+            "shortcite*": "shortcite*",
+            "shortrefcite": "shortrefcite",
+            "shorthandcite": "shorthandcite",
+            "shorthandcite*": "shorthandcite*",
+            "shorthandrefcite": "shorthandrefcite",
+            "citejournal": "citejournal",
+            "headlesscite": "headlesscite",
+            "Headlesscite": "Headlesscite",
+            "headlessfullcite": "headlessfullcite",
+            "surnamecite": "surnamecite",
+        }
+
+    i = 0
+    while True:
+        i = find_token(document.body, "\\begin_inset CommandInset citation", i)
+        if i == -1:
+            break
+        j = find_end_of_inset(document.body, i)
+        if j == -1:
+            document.warning("Can't find end of citation inset at line %d!!" % (i))
+            i += 1
+            continue
+        k = find_token(document.body, "LatexCommand", i, j)
+        if k == -1:
+            document.warning("Can't find LatexCommand for citation inset at line %d!" % (i))
+            i = j + 1
+            continue
+        cmd = get_value(document.body, "LatexCommand", k)
+        if cmd in list(new_citations.keys()):
+            pre = get_quoted_value(document.body, "before", i, j)
+            post = get_quoted_value(document.body, "after", i, j)
+            key = get_quoted_value(document.body, "key", i, j)
+            if not key:
+                document.warning("Citation inset at line %d does not have a key!" % (i))
+                key = "???"
+            # Replace known new commands with ERT
+            res = "\\" + new_citations[cmd]
+            if pre:
+                res += "[" + pre + "]"
+            if post:
+                res += "[" + post + "]"
+            elif pre:
+                res += "[]"
+            res += "{" + key + "}"
+            document.body[i : j + 1] = put_cmd_in_ert([res])
+        i = j + 1
+
 ##
 # Conversion hub
 #
@ -222,10 +384,12 @@ convert = [
    [621, [convert_url_escapes, convert_url_escapes2]],
    [622, []],
    [623, [convert_he_letter]],
+    [624, [convert_biblatex_chicago]]
 ]


 revert = [
+    [623, [revert_biblatex_chicago]],
    [622, []],
    [621, [revert_glue_parskip]],
    [620, [revert_url_escapes2, revert_url_escapes]],
--- a/src/BufferParams.cpp
+++ b/src/BufferParams.cpp
@ -2607,6 +2607,15 @@ bool BufferParams::writeLaTeX(otexstream & os, LaTeXFeatures & features,
 				+ encodings.fromLyXName(bib_encoding)->latexName();
 			delim = ",";
 		}
+		// biblatex-chicago offers the style options "authordate"
+		// or "authordate-trad". We use "authordate" if none
+		// is given via the options field.
+		if (chicago && citeEngineType() == ENGINE_TYPE_AUTHORYEAR
+		    && !contains(biblio_opts, "authordate")) {
+			opts += delim + "authordate";
+			delim = ",";
+			
+		}
 		if (!biblio_opts.empty())
 			opts += delim + biblio_opts;
 		if (!opts.empty())
--- a/src/frontends/qt/GuiDocument.cpp
+++ b/src/frontends/qt/GuiDocument.cpp
@ -3157,6 +3157,8 @@ void GuiDocument::checkPossibleCiteEngines()
 		force_engine = "biblatex";
 	else if (documentClass().provides("biblatex-natbib"))
 		force_engine = "biblatex-natbib";
+	else if (documentClass().provides("biblatex-chicago"))
+		force_engine = "biblatex-chicago";

 	if (!force_engine.empty())
 		biblioModule->citeEngineCO->setCurrentIndex(
@ -3217,7 +3219,18 @@ void GuiDocument::citeEngineChanged(int n)

 void GuiDocument::updateEngineDependends()
 {
+	// These are useful with biblatex, jurabib and natbib
+	QString const engine =
+		biblioModule->citeEngineCO->itemData(
+				biblioModule->citeEngineCO->currentIndex()).toString();
+	LyXCiteEngine const * ce = theCiteEnginesList[fromqstr(engine)];
+
 	bool const biblatex = isBiblatex();
+	bool const citepack = biblatex
+			|| ce->required("jurabib.sty")
+			|| ce->required("natbib.sty");
+	biblioModule->citePackageOptionsLE->setEnabled(citepack);
+	biblioModule->citePackageOptionsL->setEnabled(citepack);

 	// These are only useful with BibTeX
 	biblioModule->defaultBiblioCO->setEnabled(!biblatex);
@ -3225,25 +3238,16 @@ void GuiDocument::updateEngineDependends()
 	biblioModule->resetDefaultBiblioPB->setEnabled(!biblatex);
 	biblioModule->bibtopicCB->setEnabled(!biblatex);

-	// These are only useful with Biblatex
-	biblioModule->biblatexBbxCO->setEnabled(biblatex);
-	biblioModule->biblatexBbxLA->setEnabled(biblatex);
-	biblioModule->biblatexCbxCO->setEnabled(biblatex);
-	biblioModule->biblatexCbxLA->setEnabled(biblatex);
-	biblioModule->resetBbxPB->setEnabled(biblatex);
-	biblioModule->resetCbxPB->setEnabled(biblatex);
-	biblioModule->matchBbxPB->setEnabled(biblatex);
-
-	// These are useful with biblatex, jurabib and natbib
-	QString const engine =
-		biblioModule->citeEngineCO->itemData(
-				biblioModule->citeEngineCO->currentIndex()).toString();
-	LyXCiteEngine const * ce = theCiteEnginesList[fromqstr(engine)];
-
-	bool const citepack = ce->required("biblatex.sty") || ce->required("jurabib.sty")
-			|| ce->required("natbib.sty");
-	biblioModule->citePackageOptionsLE->setEnabled(citepack);
-	biblioModule->citePackageOptionsL->setEnabled(citepack);
+	// These are only useful with Biblatex (but not with
+	// biblatex-chicago or maybe other portmanteau packages)
+	bool const biblatex_pure = biblatex && !ce->required("biblatex-chicago.sty");
+	biblioModule->biblatexBbxCO->setEnabled(biblatex_pure);
+	biblioModule->biblatexBbxLA->setEnabled(biblatex_pure);
+	biblioModule->biblatexCbxCO->setEnabled(biblatex_pure);
+	biblioModule->biblatexCbxLA->setEnabled(biblatex_pure);
+	biblioModule->resetBbxPB->setEnabled(biblatex_pure);
+	biblioModule->resetCbxPB->setEnabled(biblatex_pure);
+	biblioModule->matchBbxPB->setEnabled(biblatex_pure);
 }


--- a/src/tex2lyx/Preamble.cpp
+++ b/src/tex2lyx/Preamble.cpp
@ -1806,20 +1806,29 @@ void Preamble::handle_package(Parser &p, string const & name,
 			h_biblio_options = join(options, ",");
 	}

-	else if (name == "biblatex") {
+	else if (name == "biblatex" || name == "biblatex-chicago") {
+		bool const chicago = name == "biblatex-chicago";
 		h_biblio_style = "plainnat";
 		h_cite_engine = "biblatex";
 		h_cite_engine_type = "authoryear";
 		string opt;
-		vector<string>::iterator it =
-			find(options.begin(), options.end(), "natbib");
-		if (it != options.end()) {
-			options.erase(it);
-			h_cite_engine = "biblatex-natbib";
+		if (chicago) {
+			h_cite_engine = "biblatex-chicago";
+			vector<string>::iterator it =
+				find(options.begin(), options.end(), "authordate");
+			if (it == options.end())
+				h_cite_engine_type = "notes";
 		} else {
-			opt = process_keyval_opt(options, "natbib");
-			if (opt == "true")
+			vector<string>::iterator it =
+				find(options.begin(), options.end(), "natbib");
+			if (it != options.end()) {
+				options.erase(it);
 				h_cite_engine = "biblatex-natbib";
+			} else {
+				opt = process_keyval_opt(options, "natbib");
+				if (opt == "true")
+					h_cite_engine = "biblatex-natbib";
+			}
 		}
 		opt = process_keyval_opt(options, "style");
 		if (!opt.empty()) {
--- a/src/tex2lyx/text.cpp
+++ b/src/tex2lyx/text.cpp
@ -217,6 +217,14 @@ char const * const known_biblatex_commands[] = { "cite", "Cite", "textcite", "Te
 "supercite", "cites", "Cites", "textcites", "Textcites", "parencites", "Parencites",
 "smartcites", "Smartcites", "autocites", "Autocites", 0 };

+/*!
+ * biblatex-chicago commands.
+ * Known starred forms: \cite*, \citeauthor*, \Citeauthor*, \parencite*, \citetitle*.
+ */
+char const * const known_biblatex_chicago_commands[] = { "atcite", "atpcite", "Citetitle", "gentextcite",
+"Gentextcite", "shortcite", "shortrefcite", "shorthandcite", "shorthandrefcite",
+"citejournal", "headlesscite", "Headlesscite", "headlessfullcite", "surnamecite", 0 };
+
 // Whether we need to insert a bibtex inset in a comment
 bool need_commentbib = false;

@ -3180,7 +3188,9 @@ void parse_text(Parser & p, ostream & os, unsigned flags, bool outer,
 			&& preamble.citeEngine() != "biblatex-natbib";
 	bool const use_biblatex_natbib = isProvided("biblatex-natbib")
 			|| (isProvided("biblatex") && preamble.citeEngine() == "biblatex-natbib");
-	need_commentbib = use_biblatex || use_biblatex_natbib;
+	bool const use_biblatex_chicago = isProvided("biblatex-chicago")
+			|| (isProvided("biblatex") && preamble.citeEngine() == "biblatex-chicago");
+	need_commentbib = use_biblatex || use_biblatex_natbib || use_biblatex_chicago;
 	string last_env;

 	// it is impossible to determine the correct encoding for non-CJK Japanese.
@ -4683,22 +4693,24 @@ void parse_text(Parser & p, ostream & os, unsigned flags, bool outer,
 		}

 		if ((use_biblatex
-			 && is_known(t.cs(), known_biblatex_commands)
-			 && ((t.cs() == "cite"
-			     || t.cs() == "citeauthor"
-			     || t.cs() == "Citeauthor"
-			     || t.cs() == "parencite"
-			     || t.cs() == "citetitle")
+		     && is_known(t.cs(), known_biblatex_commands)
+		     && ((t.cs() == "cite"
+			  || t.cs() == "citeauthor"
+			  || t.cs() == "Citeauthor"
+			  || t.cs() == "parencite"
+			  || t.cs() == "citetitle")
 			 || p.next_token().asInput() != "*"))
-			|| (use_biblatex_natbib
-			    && (is_known(t.cs(), known_biblatex_commands)
-			      || is_known(t.cs(), known_natbib_commands))
-			    && ((t.cs() == "cite" || t.cs() == "citet" || t.cs() == "Citet"
-			       || t.cs() == "citep" || t.cs() == "Citep" || t.cs() == "citealt"
-			       || t.cs() == "Citealt" || t.cs() == "citealp" || t.cs() == "Citealp"
-			       || t.cs() == "citeauthor" || t.cs() == "Citeauthor"
-			       || t.cs() == "parencite" || t.cs() == "citetitle")
-			       || p.next_token().asInput() != "*"))){
+			 || (use_biblatex_natbib
+			     && (is_known(t.cs(), known_biblatex_commands)
+				 || is_known(t.cs(), known_natbib_commands))
+			     && ((t.cs() == "cite" || t.cs() == "citet" || t.cs() == "Citet"
+				  || t.cs() == "Citealt" || t.cs() == "citealp" || t.cs() == "Citealp"
+				  || t.cs() == "citeauthor" || t.cs() == "Citeauthor"
+				  || t.cs() == "parencite" || t.cs() == "citetitle")
+				 || p.next_token().asInput() != "*"))
+			 || (use_biblatex_chicago
+			     && (is_known(t.cs(), known_biblatex_commands)
+				 || is_known(t.cs(), known_biblatex_chicago_commands)))){
 			context.check_layout(os);
 			string command = t.cs();
 			if (p.next_token().asInput() == "*") {
@ -4856,10 +4868,14 @@ void parse_text(Parser & p, ostream & os, unsigned flags, bool outer,
 			end_inset(os);
 			// Need to set the cite engine if biblatex is loaded by
 			// the document class directly
-			if (preamble.citeEngine() == "basic")
-				use_biblatex_natbib ?
-					  preamble.citeEngine("biblatex-natbib")
-					: preamble.citeEngine("biblatex");
+			if (preamble.citeEngine() == "basic") {
+				if (use_biblatex_natbib)
+					preamble.citeEngine("biblatex-natbib");
+				else if (use_biblatex_chicago)
+					preamble.citeEngine("biblatex-chicago");
+				else
+					preamble.citeEngine("biblatex");
+			}
 			continue;
 		}

--- a/src/version.h
+++ b/src/version.h
@ -32,8 +32,8 @@ extern char const * const lyx_version_info;

 // Do not remove the comment below, so we get merge conflict in
 // independent branches. Instead add your own.
-#define LYX_FORMAT_LYX 623 // ufogiel: remove hebrew letter
-#define LYX_FORMAT_TEX2LYX 623
+#define LYX_FORMAT_LYX 624 // spitz: support biblatex-chicago
+#define LYX_FORMAT_TEX2LYX 624

 #if LYX_FORMAT_TEX2LYX != LYX_FORMAT_LYX
 #ifndef _MSC_VER