#! /bin/bash

usage () {
cat <<EOF
git icedust-describe [options] 
Print a description of the git current branch, commit and any modifications for ICEDUST or a subset
Useful for book-keeping during production and in analysis

Options:
  -h                This help message

  -r, --repository  Also describe the repository scripts directory.  
                    Ommitted by default
  -d, --debug       Enable debug output for this command
EOF
exit $1
}


DebugStream=/dev/null
IncludeRepositoryScripts=false
while [ "$#" != 0 ]; do
  case "$1" in
    -d | --debug )
      shift; set -x; debugstream=/dev/stderr ;;
    -r | --repository )
      shift; IncludeRepositoryScripts=true;;
    -h) usage 0 ;;
    -*)
      echo Unknown option $1 ; exit 1 ;;
    *)
    break;
    ;;
  esac
done

## Get the ICEDUST_HOME and ICEDUST_PROJECT variables
tmp="`git icedust-home "$ICEDUST_HOME" "$ICEDUST_PROJECT"||true`"
# Check if there was an issue
if grep 'Error' <<< "$tmp" &> "$DebugStream" ;then
        $ECHO $tmp
        $ECHO "icedust-describe: Error: Problem with ICEDUST_HOME and ICEDUST_PROJECT variables (see above messge)."
        $ECHO "Current values: "
        $ECHO "   ICEDUST_HOME=$ICEDUST_HOME"
        $ECHO "   ICEDUST_PROJECT=$ICEDUST_PROJECT"
        exit 1
fi
ICEDUST_HOME=`sed 's!^.*ICEDUST_HOME=\([^;]\+\);.*!\1!' <<<$tmp`
ICEDUST_PROJECT=`sed 's!^.*ICEDUST_PROJECT=\([^;]\+\);.*!\1!' <<<$tmp`
unset tmp

### Main code to output description
DescribeDirectory(){
    local prefix="$1";shift
    local directory="$1";shift

    ( cd "$directory";
    local branch="`git describe --all`"
    local commit="`git rev-parse --short HEAD`"
    local changes=`git diff --name-status |wc -l`
    local mods=`[ "$changes" -gt 0 ] && echo "__${changes}_UNCOMMITTED__" || true `
    echo "$prefix:$branch($commit)$mods"
    )
}

DescribeDirectory Packages "$ICEDUST_HOME/$ICEDUST_PROJECT/packages"
DescribeDirectory Externals "$ICEDUST_HOME/$ICEDUST_PROJECT/packages/EXTERNALS"
if $IncludeRepositoryScripts ;then 
        DescribeDirectory Repository "$ICEDUST_REPOSITORY"
fi