Add C++ indent tool.

src/tools/pgindent/README

@@ -37,3 +37,11 @@ following options:
 
 	find . \( -name '*.java' -o -name '*.java.in' \) -print |
 		xargs -n100 pgjindent
+---------------------------------------------------------------------------
+
+For cpp, we use astyle, http://astyle.sourceforge.net/, with the
+following options:
+
+	find src/interfaces/libpq++ -name '*.[ch]' -print |
+		xargs -n100 pgcppindent
+

src/tools/pgindent/pgcppindent

+#!/bin/sh
+
+trap "rm -f /tmp/$$ /tmp/$$a" 0 1 2 3 15
+entab </dev/null >/dev/null
+if [ "$?" -ne 0 ]
+then	echo "Go to the src/tools/entab directory and do a 'make' and 'make install'." >&2
+	echo "This will put the 'entab' command in your path." >&2
+	echo "Then run $0 again."
+	exit 1
+fi
+astyle --version </dev/null >/dev/null 2>&1
+if [ "$?" -eq 0 ]
+then	echo "You do not appear to have 'astyle' installed on your system." >&2
+	exit 1
+fi
+
+for FILE
+do
+	astyle --style=ansi -b -p -S < "$FILE" >/tmp/$$ 2>/tmp/$$a
+	if [ "$?" -ne 0 -o -s /tmp/$$a ]
+	then	echo "$FILE"
+		cat /tmp/$$a
+	fi
+	cat /tmp/$$ |
+	entab -t4 -qc |
+	cat >/tmp/$$a && cat /tmp/$$a >"$FILE"
+done