#!/bin/sh -ue
#
# Add Google Analytics code to web pages if missing.
#       - Cameron Simpson <cs@zip.com.au> 16jul2009
#

cmd=`basename "$0"`
usage="Usage: $cmd -g ganalytics.txt [-s] htmlfiles...
  -g ganalytics.txt     Text file containing the Google Analytics HTML code.
  -s                    Silent. Disables tracing and is also passed to bsed."

txtfile=
trace=set-x
bsedopts=

badopts=

while [ $# -gt 0 ]
do
  case "$1" in
    -g) txtfile=$2; shift ;;
    -s) trace= bsedopts="$bsedopts $1" ;;
    --) shift; break ;;
    -?*)echo "$cmd: unrecognised option: $1" >&2
        badopts=1
        ;;
    *)  break ;;
  esac
  shift
done

if [ -z "$txtfile" ]
then
  echo "$cmd: missing -g ganalytics.txt" >&2
  badopts=1
else
  if [ ! -f "$txtfile" ]
  then
    echo "$cmd: -g $txtfile: not a regular file" >&2
    badopts=1
  else
    urchin=`sed -n 's/.* pageTracker = _gat._getTracker("\(UA-[^"]*\)").*/\1/p' <"$txtfile"`
    if [ -n "$urchin" ]
    then
      sedf='/< *\/ *[Bb][Oo][Dd][Yy] *>/i\
'`sed '$!s/$/\\\\/' "$txtfile"`
    else
      echo "$cmd: $txtfile: can't local urchin string" >&2
      badopts=1
    fi
  fi
fi

if [ $# = 0 ]
then
  echo "$cmd: missing htmlfiles" >&2
  badopts=1
fi

[ $badopts ] && { echo "$usage" >&2; exit 2; }

xit=0

for htmlfile
do
  [ -s "$htmlfile" ] \
  || { echo "$cmd: $htmlfile: not a file" >&2
       xit=1
       continue
     }
  fgrep -i '</body>' <"$htmlfile" >/dev/null \
  || { echo "$cmd: $htmlfile: no </BODY>, skipped" >&2
       xit=1
       continue
     }

  fgrep "_getTracker(\"$urchin\")" <"$htmlfile" >/dev/null \
  && { echo "$cmd: $htmlfile: already has urchin" >&2
       continue
     }

  $trace bsed $bsedopts "$sedf" "$htmlfile"
done

exit $xit