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mkyearidx.rc: try harder to find targets for next/prev links

--- a/mkyearidx.rc

+++ b/mkyearidx.rc

@@ -1,8 +1,6 @@

 #!/bin/rc

 this=`{basename `{pwd}}

-prev=`{echo $this - 1 | bc}

-next=`{echo $this + 1 | bc}

 months=(January February March April May June July August September October November December)

@@ -39,15 +37,30 @@

 <p>

 EOF

-if(test -d ../^$"prev)

-	echo '<a href="../'^$"prev^'/index.html">prev</a>'

-if not

+fn findnext{

+	@{

+		for(i in `{seq `{echo $1 $2 | bc} $2 $3}){

+			if(test -d ../^$i){

+				echo $i

+				exit

+			}

+		}

+	}

+}

+

+prev=`{findnext $this -1 1990}

+if(~ $#prev 0)

 	echo '<span class="disabled">prev</span>'

-echo ' | <a href="../index.html">up</a> | '

-if(test -d ../^$"next)

-	echo '<a href="../'^$next^'/index.html">next</a>'

 if not

+	echo '<a href="../'^$"prev^'/index.html">prev</a>'

+

+echo ' | <a href="../index.html">up</a> | '

+

+next=`{findnext $this +1 `{date '+%Y'}}

+if(~ $#next 0)

 	echo '<span class="disabled">next</span>'

+if not

+	echo '<a href="../'^$next^'/index.html">next</a>'

 echo '</p>'

 for(m in `{seq -w 1 12}){