doc/tut/greeter0/: Initial `greeter' example.

diff --git a/doc/tut/greeter0/.gitignore b/doc/tut/greeter0/.gitignore
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+++ b/doc/tut/greeter0/.gitignore
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+*.o
+/greeter.[ch]
+/greet

diff --git a/doc/tut/greeter0/Makefile b/doc/tut/greeter0/Makefile
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+++ b/doc/tut/greeter0/Makefile
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+### -*-makefile-*-
+
+SOD = sod
+
+.SUFFIXES: .sod .c .h
+.sod.c:; $(SOD) -tc $<
+.sod.h:; $(SOD) -th $<
+.PRECIOUS: %.c %.h
+
+all::
+.PHONY: all
+
+clean::; rm -f *.o
+.PHONY: clean
+
+all:: greet
+greet: greeter.o greet.o
+       $(CC) -o greet $^ -lsod
+greet.o greeter.o: greeter.h
+clean::; rm -f greet greeter.c greeter.h

diff --git a/doc/tut/greeter0/greet.c b/doc/tut/greeter0/greet.c
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+++ b/doc/tut/greeter0/greet.c
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+/* -*-c-*- */
+
+#include "greeter.h"
+
+int main(void)
+{
+  SOD_DECL(Greeter, g, NO_KWARGS);
+
+  Greeter_greet(g, stdout);
+  return (0);
+}

diff --git a/doc/tut/greeter0/greeter.sod b/doc/tut/greeter0/greeter.sod
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+++ b/doc/tut/greeter0/greeter.sod
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+/* -*-sod-*- */
+
+code c: includes {
+#include "greeter.h"
+}
+
+code h: includes {
+#include <stdio.h>
+#include <sod/sod.h>
+}
+
+typename FILE;
+
+class Greeter: SodObject {
+  void greet(FILE *fp) {
+    fputs("Hello, world!\n", fp);
+  }
+}