Implement "key only" citation style

File format change.

development/FORMAT

@@ -7,6 +7,12 @@ changes happened in particular if possible. A good example would be
 
 -----------------------
 
+2017-01-13 Jürgen Spitzmüller <spitz@lyx.org>
+	* Format incremented to 529:
+	  \begin_inset CommandInset citation
+	    New LatexCommand value: keyonly -> outputs only the key,
+	    without any cite command.
+
 2017-01-08 Jürgen Spitzmüller <spitz@lyx.org>
 	* Format incremented to 528: Biblatex support
 	  - New buffer param options:

lib/citeengines/basic.citeengine

@@ -26,6 +26,7 @@ DefaultBiblio  plain
 CiteEngine default
 	cite[]
 	nocite
+	keyonly
 End
 
 
@@ -46,6 +47,8 @@ CiteFormat default
 	#
 	_notcited not cited
 	_addtobib Add to bibliography only.
+	_keyonly Key only.
+	_key Key
 
 	#
 	# 2. Macros re-used in the style definitions
@@ -80,4 +83,6 @@ CiteFormat default
 	cite %!open%{%dialog%[[#ID]][[%!makecite%]]}%!textafter%%!close%
 	# "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

lib/citeengines/biblatex-natbib.citeengine

@@ -48,6 +48,8 @@ MaxCiteNames 3
 #
 # 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).
@@ -88,6 +90,7 @@ CiteEngine authoryear
 	fullcite[][]
 	footfullcite[][]
 	nocite
+	keyonly
 End
 
 CiteEngine numerical
@@ -103,6 +106,7 @@ CiteEngine numerical
 	fullcite[][]
 	footfullcite[][]
 	nocite
+	keyonly
 End
 
 
@@ -126,6 +130,8 @@ CiteFormat default
 	#
 	_notcited not cited
 	_addtobib Add to bibliography only.
+	_keyonly Key only.
+	_key Key
 	_finaland , and 
 	_footnote Footnote
 	_foot Foot
@@ -221,6 +227,8 @@ CiteFormat default
 	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

lib/citeengines/biblatex.citeengine

@@ -44,6 +44,8 @@ MaxCiteNames 3
 #
 # 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).
@@ -80,6 +82,7 @@ CiteEngine authoryear
 	fullcite[][]
 	footfullcite[][]
 	nocite
+	keyonly
 End
 
 CiteEngine numerical
@@ -94,6 +97,7 @@ CiteEngine numerical
 	fullcite[][]
 	footfullcite[][]
 	nocite
+	keyonly
 End
 
 
@@ -117,6 +121,8 @@ CiteFormat default
 	#
 	_notcited not cited
 	_addtobib Add to bibliography only.
+	_keyonly Key only.
+	_key Key
 	_footnote Footnote
 	_foot Foot
 	_fullcite bibliography entry
@@ -209,6 +215,8 @@ CiteFormat default
 	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

lib/citeengines/jurabib.citeengine

@@ -43,6 +43,8 @@ MaxCiteNames 3
 #
 # 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).
@@ -93,6 +95,7 @@ CiteEngine authoryear
 	citeyearpar [][]
 	fullcite [][]
 	nocite
+	keyonly
 End
 
 #
@@ -112,6 +115,8 @@ CiteFormat authoryear
 	#
 	_notcited not cited
 	_addtobib Add to bibliography only.
+	_keyonly Key only.
+	_key Key
 	_fullcite bibliography entry
 	_bibentry Bibliography entry.
 	_before before
@@ -225,4 +230,6 @@ CiteFormat authoryear
 	fullcite {%dialog%[[%_bibentry%]][[{%label%[[%!fullcite%]][[%key%%!nextkey% (%_fullcite%)]]}]]}
 	# "Add to bibliography only." (dialog) / "Key; Key ... (not cited)" (button)
 	nocite {%dialog%[[%_addtobib%]][[%key%%!nextkey% (%_notcited%)]]}
+	# Output only the key
+	keyonly {%dialog%[[%_keyonly%]][[%_key%: %key%%!nextkey%]]}
 End

lib/citeengines/natbib.citeengine

@@ -44,6 +44,8 @@ MaxCiteNames 2
 #
 # 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).
@@ -75,6 +77,7 @@ CiteEngine authoryear
 	citeyear[]
 	citeyearpar[][]
 	nocite
+	keyonly
 End
 
 CiteEngine numerical
@@ -86,6 +89,7 @@ CiteEngine numerical
 	citeyearpar[][]
 	citeyear
 	nocite
+	keyonly
 End
 
 
@@ -109,6 +113,8 @@ CiteFormat default
 	#
 	_notcited not cited
 	_addtobib Add to bibliography only.
+	_keyonly Key only.
+	_key Key
 	# The following are handled by BiblioInfo
 	_etal  et al.
 	_namesep , [[separate author names in citation, except for last name]]
@@ -155,6 +161,8 @@ CiteFormat default
 	citeyearpar %!open%%!textbefore%%!startlink%%!year%%!endlink%%!nextyear%%!textafter%%!close%
 	# "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

lib/lyx2lyx/lyx_2_3.py

@@ -1369,6 +1369,37 @@ def revert_biblatex(document):
         ]
 
 
+def revert_citekeyonly(document):
+    " Revert keyonly cite command to ERT "
+
+    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 != "keyonly":
+            i = j + 1
+            continue
+
+        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))
+        # Replace known new commands with ERT
+        document.body[i:j+1] = put_cmd_in_ert([key])
+        i = j + 1
+
+
 ##
 # Conversion hub
 #
@@ -1394,10 +1425,12 @@ convert = [
            [525, []],
            [526, []],
            [527, []],
-           [528, []]
+           [528, []],
+           [529, []]
           ]
 
 revert =  [
+           [528, [revert_citekeyonly]],
            [527, [revert_biblatex]],
            [526, [revert_noprefix]],
            [525, [revert_plural_refs]],

src/insets/InsetCitation.cpp

@@ -508,9 +508,18 @@ void InsetCitation::forOutliner(docstring & os, size_t const, bool const) const
 // engine, e.g. \cite[]{} for the basic engine.
 void InsetCitation::latex(otexstream & os, OutputParams const & runparams) const
 {
+	BiblioInfo const & bi = buffer().masterBibInfo();
+	if (getCmdName() == "keyonly") {
+		// Special command to only return the key
+		if (!bi.isBibtex(getParam("key")))
+			// escape chars with bibitems
+			os << escape(cleanupWhitespace(getParam("key")));
+		else
+			os << cleanupWhitespace(getParam("key"));
+		return;
+	}
 	vector<CitationStyle> citation_styles = buffer().params().citeStyles();
 	CitationStyle cs = asValidLatexCommand(buffer().params(), getCmdName(), citation_styles);
-	BiblioInfo const & bi = buffer().masterBibInfo();
 	// FIXME UNICODE
 	docstring const cite_str = from_utf8(citationStyleToString(cs, true));
 

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 528 // spitz: biblatex
+#define LYX_FORMAT_LYX 529 // spitz: keyonly cite type
-#define LYX_FORMAT_TEX2LYX 528
+#define LYX_FORMAT_TEX2LYX 529
 
 #if LYX_FORMAT_TEX2LYX != LYX_FORMAT_LYX
 #ifndef _MSC_VER