allow disabling Lexilla (Lexer) support by specifying --without-lexilla

* This does not make sense for most SciTECO builds, but only when you
  want to optimize for size as the lexers take up 50% of the compressed binary
  size.
  Without Lexilla, it should be possible get it compiled in about 500kb.
* It can be useful for instance when building for embedded distributions.
* When Lexilla is disabled, symbols-scilexer.c is also not generated
  (we assume that the Lexilla sources are not available and it also doesn't serve any purpose).
* Consequently, most of the lexer configuration scripts are also not installed
  under --without-lexilla.

1 files changed, 83 insertions, 79 deletions

diff --git a/lib/Makefile.am b/lib/Makefile.am
index c528636..06bee14 100644
--- a/lib/Makefile.am
+++ b/lib/Makefile.am
@@ -13,87 +13,91 @@ dist_colorscheme_DATA = colors/terminal.tes \
 
 lexerdir = $(scitecolibdir)/lexers
 
+# This lexer is responsible for styling
+# womanpages and is thus useful even when omitting
+# the syntax highlighting lexers.
+dist_lexer_DATA = lexers/woman.tes
+
+if LEXILLA
+
 # Lexer configurations for language
 # syntax highlighting.
 # This list must be extended when adding
 # a new lexer configuration:
-dist_lexer_DATA = lexers/verilog.tes \
-                  lexers/php.tes \
-                  lexers/pascal.tes \
-                  lexers/rebol.tes \
-                  lexers/flagship.tes \
-                  lexers/vhdl.tes \
-                  lexers/ave.tes \
-                  lexers/go.tes \
-                  lexers/f95.tes \
-                  lexers/lisp.tes \
-                  lexers/ada.tes \
-                  lexers/d.tes \
-                  lexers/octave.tes \
-                  lexers/mako.tes \
-                  lexers/lout.tes \
-                  lexers/lua.tes \
-                  lexers/tal.tes \
-                  lexers/systemverilog.tes \
-                  lexers/matlab.tes \
-                  lexers/flash.tes \
-                  lexers/make.tes \
-                  lexers/eiffel.tes \
-                  lexers/swift.tes \
-                  lexers/r.tes \
-                  lexers/vala.tes \
-                  lexers/purebasic.tes \
-                  lexers/scheme.tes \
-                  lexers/docbook.tes \
-                  lexers/cobol.tes \
-                  lexers/powerpro.tes \
-                  lexers/tcl.tes \
-                  lexers/cmake.tes \
-                  lexers/freebasic.tes \
-                  lexers/xml.tes \
-                  lexers/asl.tes \
-                  lexers/c.tes \
-                  lexers/cpp.tes \
-                  lexers/gob.tes \
-                  lexers/devicetree.tes \
-                  lexers/test.tes \
-                  lexers/kix.tes \
-                  lexers/baan.tes \
-                  lexers/js.tes \
-                  lexers/spice.tes \
-                  lexers/idl.tes \
-                  lexers/ch.tes \
-                  lexers/vb.tes \
-                  lexers/awk.tes \
-                  lexers/diff.tes \
-                  lexers/gap.tes \
-                  lexers/mmixal.tes \
-                  lexers/pike.tes \
-                  lexers/asm.tes \
-                  lexers/vxml.tes \
-                  lexers/cs.tes \
-                  lexers/abaqus.tes \
-                  lexers/java.tes \
-                  lexers/avs.tes \
-                  lexers/f77.tes \
-                  lexers/batch.tes \
-                  lexers/specman.tes \
-                  lexers/rc.tes \
-                  lexers/tacl.tes \
-                  lexers/bash.tes \
-                  lexers/oscript.tes \
-                  lexers/html.tes \
-                  lexers/perl.tes \
-                  lexers/inno.tes \
-                  lexers/pov.tes \
-                  lexers/rust.tes \
-                  lexers/blitzbasic.tes \
-                  lexers/caml.tes \
-                  lexers/python.tes \
-                  lexers/yaml.tes \
-                  lexers/markdown.tes
+dist_lexer_DATA += lexers/verilog.tes \
+                   lexers/php.tes \
+                   lexers/pascal.tes \
+                   lexers/rebol.tes \
+                   lexers/flagship.tes \
+                   lexers/vhdl.tes \
+                   lexers/ave.tes \
+                   lexers/go.tes \
+                   lexers/f95.tes \
+                   lexers/lisp.tes \
+                   lexers/ada.tes \
+                   lexers/d.tes \
+                   lexers/octave.tes \
+                   lexers/mako.tes \
+                   lexers/lout.tes \
+                   lexers/lua.tes \
+                   lexers/tal.tes \
+                   lexers/systemverilog.tes \
+                   lexers/matlab.tes \
+                   lexers/flash.tes \
+                   lexers/make.tes \
+                   lexers/eiffel.tes \
+                   lexers/swift.tes \
+                   lexers/r.tes \
+                   lexers/vala.tes \
+                   lexers/purebasic.tes \
+                   lexers/scheme.tes \
+                   lexers/docbook.tes \
+                   lexers/cobol.tes \
+                   lexers/powerpro.tes \
+                   lexers/tcl.tes \
+                   lexers/cmake.tes \
+                   lexers/freebasic.tes \
+                   lexers/xml.tes \
+                   lexers/asl.tes \
+                   lexers/c.tes \
+                   lexers/cpp.tes \
+                   lexers/gob.tes \
+                   lexers/devicetree.tes \
+                   lexers/test.tes \
+                   lexers/kix.tes \
+                   lexers/baan.tes \
+                   lexers/js.tes \
+                   lexers/spice.tes \
+                   lexers/idl.tes \
+                   lexers/ch.tes \
+                   lexers/vb.tes \
+                   lexers/awk.tes \
+                   lexers/diff.tes \
+                   lexers/gap.tes \
+                   lexers/mmixal.tes \
+                   lexers/pike.tes \
+                   lexers/asm.tes \
+                   lexers/vxml.tes \
+                   lexers/cs.tes \
+                   lexers/abaqus.tes \
+                   lexers/java.tes \
+                   lexers/avs.tes \
+                   lexers/f77.tes \
+                   lexers/batch.tes \
+                   lexers/specman.tes \
+                   lexers/rc.tes \
+                   lexers/tacl.tes \
+                   lexers/bash.tes \
+                   lexers/oscript.tes \
+                   lexers/html.tes \
+                   lexers/perl.tes \
+                   lexers/inno.tes \
+                   lexers/pov.tes \
+                   lexers/rust.tes \
+                   lexers/blitzbasic.tes \
+                   lexers/caml.tes \
+                   lexers/python.tes \
+                   lexers/yaml.tes \
+                   lexers/markdown.tes
 
-# This lexer is responsible for styling
-# womanpages and is thus useful even when omitting
-# the syntax highlighting lexers.
-dist_lexer_DATA += lexers/woman.tes
+endif