Added work in progress for example plugin

.gitattributes

@@ -311,6 +311,10 @@ m4/ltoptions.m4 -text
 m4/ltsugar.m4 -text
 m4/ltversion.m4 -text
 m4/lt~obsolete.m4 -text
+plugins/Dummy.c -text
+plugins/Makefile.am -text
+plugins/Makefile.in -text
+plugins/Makefile.manual -text
 src/Adisit.c -text
 src/Arith.c -text
 src/Arithc.c -text

Makefile.am

 # Process this file with automake to produce Makefile.in
-SUBDIRS = libcdi src contrib test/data test
+SUBDIRS = libcdi src contrib plugins test/data test
 #
 EXTRA_DIST=config/default OPERATORS doc/cdo.pdf doc/cdo_refcard.pdf cdo.spec README
 #

Makefile.in

@@ -377,7 +377,7 @@ top_builddir = @top_builddir@
 top_srcdir = @top_srcdir@
 
 # Process this file with automake to produce Makefile.in
-SUBDIRS = libcdi src contrib test/data test
+SUBDIRS = libcdi src contrib plugins test/data test
 #
 EXTRA_DIST = config/default OPERATORS doc/cdo.pdf doc/cdo_refcard.pdf cdo.spec README
 #

configure

@@ -21143,7 +21143,7 @@ ac_config_files="$ac_config_files test/Detrend.test test/Arith.test test/Gradsde
 
 ac_config_files="$ac_config_files test/wildcard.test"
 
-ac_config_files="$ac_config_files Makefile src/Makefile contrib/Makefile test/Makefile test/data/Makefile cdo.spec cdo.settings"
+ac_config_files="$ac_config_files Makefile src/Makefile contrib/Makefile test/Makefile test/data/Makefile plugins/Makefile cdo.spec cdo.settings"
 
 cat >confcache <<\_ACEOF
 # This file is a shell script that caches the results of configure
@@ -22313,6 +22313,7 @@ do
     "contrib/Makefile") CONFIG_FILES="$CONFIG_FILES contrib/Makefile" ;;
     "test/Makefile") CONFIG_FILES="$CONFIG_FILES test/Makefile" ;;
     "test/data/Makefile") CONFIG_FILES="$CONFIG_FILES test/data/Makefile" ;;
+    "plugins/Makefile") CONFIG_FILES="$CONFIG_FILES plugins/Makefile" ;;
     "cdo.spec") CONFIG_FILES="$CONFIG_FILES cdo.spec" ;;
     "cdo.settings") CONFIG_FILES="$CONFIG_FILES cdo.settings" ;;
 

configure.ac

@@ -229,7 +229,7 @@ AC_CONFIG_FILES([test/Cat.test test/Gridarea.test test/Genweights.test test/Rema
 AC_CONFIG_FILES([test/Select.test test/Spectral.test test/Timstat.test test/Vertint.test],[chmod a+x "$ac_file"])
 AC_CONFIG_FILES([test/Detrend.test test/Arith.test test/Gradsdes.test],[chmod a+x "$ac_file"])
 AC_CONFIG_FILES([test/wildcard.test],[chmod a+x "$ac_file"])
-AC_CONFIG_FILES([Makefile src/Makefile contrib/Makefile test/Makefile test/data/Makefile cdo.spec cdo.settings])
+AC_CONFIG_FILES([Makefile src/Makefile contrib/Makefile test/Makefile test/data/Makefile plugins/Makefile cdo.spec cdo.settings])
 AC_OUTPUT
 
 #  ----------------------------------------------------------------------

plugins/Dummy.c

+#include <stdio.h>
+
+void Module(void *args) {
+    puts("Dummy");
+}
+
+char *Operators[128] = { "dummy1", "dummy2" };
+
+char *Help[] = { "Zeile 1", "Zeile 2" };

plugins/Makefile.am

+## Process this file with automake to produce Makefile.in
+
+lib_LTLIBRARIES = libDummy.la
+
+libDummy_la_SOURCES = Dummy.c
+libDummy_la_CPPFLAGS = -I$(top_srcdir)/libcdi/src
+libDummy_la_LIBADD = $(top_builddir)/src/libcdo.la

plugins/Makefile.manual

+all: Dummy.cdo
+
+%.cdo: %.c
+	$(CC) $(CPPFLAGS) $(CFLAGS) -fpic $(LDFLAGS) -shared $(LDLIBS) -o $@ $<