new script to start/stop indexing according to battery/ac power status

src/desktop/recoll_index_on_ac.sh

@@ -0,0 +1,62 @@
+#!/bin/sh
+
+# This is a shell script that starts and stops the recollindex daemon
+# depending on whether or not the power supply is plugged in.  It should be
+# called from the file ~/.config/autostart/recollindex.desktop.
+
+# By: The Doctor (drwho at virtadpt dot net)
+# License: GPLv3
+# 
+# Modifications by J.F Dockes 
+#  - replaced "acpi" usage with "on_ac_power" which seems to be both
+#    more common and more universal.
+#  - Changed the default to be that we run recollindex if we can't determine
+#    power status (ie: on_ac_power not installed or not working: we're most
+#    probably not running on a laptop). 
+
+INDEXER="recollindex -w 60 -m"
+ACPI=`which on_ac_power`
+
+# If the on_ac_power script isn't installed, warn, but run anyway. Maybe
+# this is not a laptop or not linux.
+if test "x$ACPI" = "x" ; then
+    echo "on_ac_power utility not found. Starting recollindex anyway."
+fi
+
+while true; do
+    # Determine whether or not the power supply is plugged in.
+    if test "x$ACPI" != "x" ; then
+        on_ac_power
+        STATUS=$?
+    else
+        STATUS=0
+    fi
+
+    # Get the PID of the indexing daemon.
+    if test -f ~/.recoll/index.pid ; then 
+       PID=`cat ~/.recoll/index.pid`
+       # Make sure that this is recollindex running. pid could have
+       # been reallocated
+       ps ax | egrep "^[ \t]*$PID " | grep -q recollindex || PID=""
+    fi
+#    echo "Recollindex pid is $PID"
+
+    if test $STATUS -eq 1 ; then
+	# The power supply is not plugged in.  See if the indexing daemon is
+	# running, and if it is, kill it.  The indexing daemon will not be
+	# started.
+        if test x"$PID" != x; then
+	    kill $PID
+	fi
+    else
+	# The power supply is plugged in or we just don't know.  
+        # See if the indexing daemon is running, and if it's not start it.
+        if test -z "$PID" ; then
+	    $INDEXER
+	fi
+    fi
+
+    # Go to sleep for a while.
+    sleep 120
+    continue
+done