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#!/usr/bin/env bash
#
# Timewarrior tag renamer.
#

# Parameters
BASENAME="`basename $0`"
OLD="$1"
NEW="$2"

# Rename tag: use as timew-tagrename <oldtag> <newtag>
# Based on from https://github.com/GothenburgBitFactory/timewarrior/issues/210
function timew_tagrename() {
  oldtag="$1"
  newtag="$2"
  idlist="$(timew summary 1970W01 - now "$oldtag" :ids | sed -nr 's/.* (@[0-9]+) .*/\1/p')"

  timew tag   $idlist "$newtag"
  timew untag $idlist "$oldtag"
}

# Check
if [ -z "$NEW" ]; then
  echo "usage: $BASENAME <old-tag> <new-tag>"
  exit 1
fi

# Dispatch
timew_tagrename $OLD $NEW