parallel rule generation

svn path=/trunk/; revision=31276

build/logging.sh

@@ -0,0 +1,29 @@
+#!/bin/sh
+
+inc_logging=true
+
+logname(){
+  name="$1"
+
+  if [ -w "$statusdir" ] && touch "$statusdir/$name"; then
+    echo "$statusdir/$name"
+  elif echo "$forcedlog" |egrep -q "^${name}=.+"; then
+    echo "$forcedlog" \
+    | sed -rn "s;^${name}=;;p"
+  else
+    echo /dev/null
+  fi
+}
+
+forcelog(){
+  name="$1"
+
+  [ "$(logname "$name")" = "/dev/null" ] \
+  && forcedlog="$forcedlog\n${name}=$(tempfile -p w3bld -s $$)"
+}
+trap "trap - 0 2 3 6 9 15; find \"${TMPDIR:-/tmp}/\" -maxdepth 1 -user \"$USER\" -name \"w3bld*$$\" -delete" 0 2 3 6 9 15
+
+logstatus(){
+  # pipeline atom to write data streams into a log file
+  tee "$(logname "$1")"
+}