Make sure that line numbering when lines are split

The default line numbering mechanism numbers all the lines in the output. For
source code, a line can be split into multiple lines because of its length. In
that case, we only want the first line to be numbered.

ConTeXt already has this mechanism for \starttyping and \stoptyping. So, we just
hook into that mechanism.

2context.vim

@@ -135,6 +135,9 @@ while s:lnum <= s:lstop
     let s:new = '\HGL{' . s:new . '}'
   endif
 
+  " Add begin and end line markers 
+  let s:new = "\\SYNBOL{}" . s:new . "\\SYNEOL{}"
+
   call add(s:lines, s:new)
 
 " Increment line numbers

t-syntax-highlight.mkiv

@@ -37,7 +37,7 @@
 \appendtoks
     \defineexternalfilter[\currentsyntaxhighlighting]
                          [\s!parent=\????syntaxhighlighting\currentexternalfilter,\c!taglabel=\vimtyping@id]%
-    \definelinenumbering [\currentsyntaxhighlighting]%
+    \normalexpanded{\definelinenumbering [\currentsyntaxhighlighting]}%
     \setevalue{type\currentsyntaxhighlighting file}{\getvalue{process\currentsyntaxhighlighting file}}%
 \to\everydefinesyntaxhighlighting
 
@@ -77,6 +77,8 @@
   \let\\\textbackslash
   \let\{\textbraceleft
   \let\}\textbraceright
+  \let\SYNBOL\donothing
+  \let\SYNEOL\donothing
 
   \setupbar[syntaxhighlightline][color=\externalfilterparameter\c!highlightcolor]
 
@@ -104,9 +106,12 @@
 
 \starttexdefinition syntaxhighlighting@linenumbering_start
    \doifinset{\externalfilterparameter\c!numbering}\syntaxhighlighting@yes
-       {\startlinenumbering
+       {\let\SYNBOL=\syntaxhighlighting_begin_number_lines
+        \let\SYNEOL=\syntaxhighlighting_end_number_lines
+        \startlinenumbering
           [\currentsyntaxhighlighting]
           [
+              \c!method=\v!type,
                \c!start=\externalfilterparameter{\c!number\c!start},
                 \c!step=\externalfilterparameter{\c!number\c!step},
              \c!continue=\externalfilterparameter{\c!number\c!continue},
@@ -120,6 +125,17 @@
       {\stoplinenumbering}
 \stoptexdefinition
 
+\newcount\nofsyntaxhighlightinglines
+
+\starttexdefinition syntaxhighlighting_begin_number_lines
+  \global\advance\nofsyntaxhighlightinglines\plusone
+  \attribute\verbatimlineattribute\nofsyntaxhighlightinglines
+\stoptexdefinition
+
+\starttexdefinition syntaxhighlighting_end_number_lines
+   \attribute\verbatimlineattribute\attributeunsetvalue
+\stoptexdefinition
+
 
 \setupsyntaxhighlighting
   [\c!tab=4,
@@ -151,7 +167,7 @@
    \c!number\c!step=1,
    \c!number\c!continue=\v!no,
    \c!numberconversion=\v!numbers,
-   \c!number\c!method=\v!first,
+   \c!number\c!method=\v!type, Not used
    \c!number\c!location=\v!left,
    \c!numberstyle=\ttx,
    \c!numbercolor=,

tests/vim/19-linenumber-break.tex

@@ -0,0 +1,33 @@
+\usemodule[vim]
+\definevimtyping[MATLAB][syntax=matlab, lines=split, numbering=yes, escape=on,
+cache=force]
+
+\showframe
+
+\starttext
+\startMATLAB
+fprintf('random text random text random text random text random text random text= %f.\n', x)
+fprintf('random text random text random text random text random text random text= %f.\n', x)
+fprintf('random text random text random text random text random text random text= %f.\n', x)
+\stopMATLAB
+
+\starttyping[lines=yes, numbering=line]
+fprintf('random text random text random text random text random text random text= %f.\n', x)
+fprintf('random text random text random text random text random text random text= %f.\n', x)
+fprintf('random text random text random text random text random text random text= %f.\n', x)
+\stoptyping
+
+\startMATLAB[numbercontinue=yes]
+fprintf('random text random text random text random text random text random text= %f.\n', x)
+fprintf('random text random text random text random text random text random text= %f.\n', x)
+fprintf('random text random text random text random text random text random text= %f.\n', x)
+\stopMATLAB
+
+\starttyping[lines=yes, numbering=line, continue=yes]
+fprintf('random text random text random text random text random text random text= %f.\n', x)
+fprintf('random text random text random text random text random text random text= %f.\n', x)
+fprintf('random text random text random text random text random text random text= %f.\n', x)
+\stoptyping
+
+
+\stoptext