#!/bin/sh

nearest_tag_by_date() {
  hg log -r 'tag()' --template '{node} {tags}\n' | while read r t; do \
    hg log -r "ancestor($r,$1)" --template "{date|isodate}  $t\n"; \
  done | sort
}

nearest_tag_by_rev() {
  hg log -r 'tag()' --template '{node} {tags}\n' | while read r t; do
    n=`hg log -r "ancestor($r,$1)::$1" --template "X\n" | wc -l`;
    echo $n $t;
  done | sort -n -r | while read n t; do printf "%8s  %s\n" $n "$t"; done
}

usage() {
cat <<EOF
  myhg-nearest-tag [--by-date | --by-rev] [REV]

  --by-date     sort by dates to marge base
  --by-date     sort by rev counts to marge base

  REV           from which revision (default is ".")
EOF
}

distance=nearest_tag_by_date
case "$1" in
  --by-date)
    shift
    distance=nearest_tag_by_date
    ;;
  --by-rev)
    shift
    distance=nearest_tag_by_rev
    ;;
  --help)
    usage
    exit 0
    ;;
esac

if [ -z "$1" ]; then
  set .
fi

echo $distance $1
$distance $1