[LyX/master] Basic support for biblatex-chicago

[Juergen Spitzmueller]

commit 71737b87f9c3729ba6d0969b032448073948a673
Author: Juergen Spitzmueller <sp...@lyx.org>
Date:   Mon Feb 18 13:14:53 2019 +0100

    Basic support for biblatex-chicago
    
    This uses a specific wrapper package that must be loaded instead of
    biblatex.
    
    Via "Requires biblatex-chicago", this is now possible.
    
    For proper support, a citeengine file needs to be written
    
    This commit here could also be backported to stable.
---
 lib/chkconfig.ltx    |    1 +
 src/BufferParams.cpp |   17 +++++++++++++----
 2 files changed, 14 insertions(+), 4 deletions(-)

diff --git a/lib/chkconfig.ltx b/lib/chkconfig.ltx
index 4b78d88..d8b027f 100644
--- a/lib/chkconfig.ltx
+++ b/lib/chkconfig.ltx
@@ -285,6 +285,7 @@
 \TestPackage{babel}
 \TestPackage{beamerposter}
 \TestPackage{biblatex}
+\TestPackage{biblatex-chicago}
 \TestPackage{bibtopic}
 \TestPackage{bicaption}
 \TestPackage{bidi}
diff --git a/src/BufferParams.cpp b/src/BufferParams.cpp
index d57f68c..60bfa3a 100644
--- a/src/BufferParams.cpp
+++ b/src/BufferParams.cpp
@@ -2348,19 +2348,25 @@ bool BufferParams::writeLaTeX(otexstream & os, 
LaTeXFeatures & features,
        }
 
        // ... but before biblatex (see #7065)
-       if (features.mustProvide("biblatex")
+       if ((features.mustProvide("biblatex")
+            || features.isRequired("biblatex-chicago"))
+           && !features.isProvided("biblatex-chicago")
            && !features.isProvided("biblatex-natbib")
            && !features.isProvided("natbib-internal")
            && !features.isProvided("natbib")
            && !features.isProvided("jurabib")) {
+               // The biblatex-chicago package has a differing interface
+               // it uses a wrapper package and loads styles via fixed options
+               bool const chicago = features.isRequired("biblatex-chicago");
                string delim = "";
                string opts;
                os << "\\usepackage";
                if (!biblatex_bibstyle.empty()
-                   && (biblatex_bibstyle == biblatex_citestyle)) {
+                   && (biblatex_bibstyle == biblatex_citestyle)
+                   && !chicago) {
                        opts = "style=" + biblatex_bibstyle;
                        delim = ",";
-               } else {
+               } else if (!chicago) {
                        if (!biblatex_bibstyle.empty()) {
                                opts = "bibstyle=" + biblatex_bibstyle;
                                delim = ",";
@@ -2392,7 +2398,10 @@ bool BufferParams::writeLaTeX(otexstream & os, 
LaTeXFeatures & features,
                        opts += delim + biblio_opts;
                if (!opts.empty())
                        os << "[" << opts << "]";
-               os << "{biblatex}\n";
+               if (chicago)
+                       os << "{biblatex-chicago}\n";
+               else
+                       os << "{biblatex}\n";
        }