1 files changed, 37 insertions, 0 deletions
diff --git a/bin/fltr_cache.rc b/bin/fltr_cache.rc
new file mode 100755
index 0000000..9394724
--- /dev/null
+++ b/bin/fltr_cache.rc
@@ -0,0 +1,37 @@
+#!/bin/rc
+
+fn fltr_cache {
+    a=()
+    tmpf=()
+
+    proc=$1
+    shift
+
+    if(~ $#* 0) {
+        tmpf=/tmp/fmttmp.$pid
+        f=$tmpf
+        score=`{{tee $tmpf || exit 1} | sha1sum}
+    }
+    if not {
+        f=$1
+        if(~ $f */) {
+            score=`{du -an $f | sha1sum || exit 1} # XXX using -n(bytes) instead of -t(lastmod) because sitemap proc touches files in tree.
+            a=$f
+            f=/dev/null
+        }
+        if not {
+            score=`{sha1sum $f || exit 1}
+            score=$score(1)
+        }
+    }
+    cachedir=/tmp/fltr_cache/$score
+    mkdir -p $cachedir >[2]/dev/null
+
+    if(test -s $cachedir/$proc)
+        cat $cachedir/$proc
+    if not
+        if($proc $a < $f | tee $cachedir/$pid)
+            mv $cachedir/$pid $cachedir/$proc
+
+    rm $tmpf $cachedir/$pid >[2]/dev/null &
+}