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.

5 files changed, 104 insertions, 86 deletions

diff --git a/INSTALL b/INSTALL
index 2623f8a..4302df9 100644
--- a/INSTALL
+++ b/INSTALL
@@ -49,7 +49,7 @@ installed by the user manually:
  * When choosing the Curses interface:
    * Scinterm (v3.1 or later):
      http://foicica.com/scinterm/
- * Lexilla (v5.0.0 or later):
+ * Lexilla (v5.0.0 or later, optional):
    https://www.scintilla.org/Lexilla.html
 
 On Ubuntu, you can install all dependencies you could possibly need
diff --git a/configure.ac b/configure.ac
index 3f50576..4ee824c 100644
--- a/configure.ac
+++ b/configure.ac
@@ -196,8 +196,12 @@ AC_ARG_WITH(lexilla,
 	AS_HELP_STRING([--with-lexilla=PATH],
 		       [Specify Lexilla's path [default=./contrib/lexilla]]),
 	[LEXILLA_PATH=$withval], [LEXILLA_PATH=./contrib/lexilla])
-LEXILLA_PATH=`canonicalize $LEXILLA_PATH`
-AC_SUBST(LEXILLA_PATH)
+AM_CONDITIONAL(LEXILLA, [test x$LEXILLA_PATH != xno])
+if [[ x$LEXILLA_PATH != xno ]]; then
+	LEXILLA_PATH=`canonicalize $LEXILLA_PATH`
+	AC_SUBST(LEXILLA_PATH)
+	AC_DEFINE(HAVE_LEXILLA, 1, [Building with Lexilla (Lexer) support])
+fi
 
 CPPFLAGS="$CPPFLAGS -I$LEXILLA_PATH/include"
 
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
diff --git a/src/Makefile.am b/src/Makefile.am
index ab6e35f..f1f073e 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -68,8 +68,10 @@ sciteco_minimal_SOURCES =
 symbols-scintilla.c symbols-scilexer.c : sciteco-minimal$(EXEEXT)
 endif
 sciteco_minimal_LDADD = libsciteco-base.la \
-                        @SCINTILLA_PATH@/bin/scintilla.a \
-                        @LEXILLA_PATH@/bin/liblexilla.a
+                        @SCINTILLA_PATH@/bin/scintilla.a
+if LEXILLA
+sciteco_minimal_LDADD += @LEXILLA_PATH@/bin/liblexilla.a
+endif
 # Scintilla is unfortunately still written in C++, so we must force
 # Automake to use the C++ linker when linking the binaries.
 # The following hack is actually advocated in the Automake manual.
@@ -77,7 +79,10 @@ nodist_EXTRA_sciteco_minimal_SOURCES = fuck-this-shit.cpp
 
 bin_PROGRAMS = sciteco
 sciteco_SOURCES =
-nodist_sciteco_SOURCES = symbols-scintilla.c symbols-scilexer.c
+nodist_sciteco_SOURCES = symbols-scintilla.c
+if LEXILLA
+nodist_sciteco_SOURCES += symbols-scilexer.c
+endif
 sciteco_LDADD = $(sciteco_minimal_LDADD)
 # see above
 nodist_EXTRA_sciteco_SOURCES = fuck-this-shit.cpp
diff --git a/src/symbols.c b/src/symbols.c
index 39703e8..ce7a7f6 100644
--- a/src/symbols.c
+++ b/src/symbols.c
@@ -25,7 +25,9 @@
 #include <glib.h>
 
 #include <Scintilla.h>
+#ifdef HAVE_LEXILLA
 #include <Lexilla.h>
+#endif
 
 #include "sciteco.h"
 #include "string-utils.h"
@@ -319,6 +321,7 @@ teco_state_scintilla_lparam_done(teco_machine_main_t *ctx, const teco_string_t *
 
 	sptr_t lParam = 0;
 
+#ifdef HAVE_LEXILLA
 	if (ctx->scintilla.iMessage == SCI_SETILEXER) {
 		if (teco_string_contains(str, '\0')) {
 			g_set_error_literal(error, TECO_ERROR, TECO_ERROR_FAILED,
@@ -333,7 +336,9 @@ teco_state_scintilla_lparam_done(teco_machine_main_t *ctx, const teco_string_t *
 			            "Lexilla lexer \"%s\" not found.", lexer);
 			return NULL;
 		}
-	} else if (str->len > 0) {
+	} else
+#endif
+	if (str->len > 0) {
 		/*
 		 * NOTE: There may even be messages that read strings
 		 * with embedded nulls.