posts/name-by-date/name-by-date.sh

   1 #!/bin/bash
   2 #
   3 # Rename JPEGs to reflect the creation date stored in their metadata.
   4 #
   5 # Copyright (C) 2010-2012 W. Trevor King <wking@tremily.us>
   6 #
   7 # This program is free software; you can redistribute it and/or modify
   8 # it under the terms of the GNU General Public License as published by
   9 # the Free Software Foundation; either version 2 of the License, or
  10 # (at your option) any later version.
  11 #
  12 # This program is distributed in the hope that it will be useful,
  13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 # GNU General Public License for more details.
  16 #
  17 # You should have received a copy of the GNU General Public License along
  18 # with this program; if not, write to the Free Software Foundation, Inc.,
  19 # 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  20 #
  21 #
  22 # usage: name-by-date.sh $(find . -name '*.jpg')
  23
  24 # check for required utilities
  25 DIRNAME=$(which dirname) || exit 1
  26 EXIF=$(which exif) || exit 1
  27 FILE_=$(which file) || exit 1
  28 GREP=$(which grep) || exit 1
  29 MV=$(which mv) || exit 1
  30 SED=$(which sed) || exit 1
  31 TEST=$(which '[') || exit 1  # but I just use [ in the script
  32
  33 NAME_BY_DATE_FIELD_NAME="${NAME_BY_DATE_FIELD_NAME:-Date and Time (Original)}"
  34
  35 while [ -n "$1" ]; do
  36         FILE=$1
  37         TYPE=$("${FILE_}" "$FILE" | "${GREP}" JPEG)
  38         if [ -n "$TYPE" ]; then
  39                 FIELD_NAME="$NAME_BY_DATE_FIELD_NAME"
  40                 if [ -z "$FIELD_NAME" ]; then
  41                                 FIELD_NAME='Date and Time'
  42                 fi
  43                 ASCII_DATE=$("${EXIF}" -m -t "$FIELD_NAME" "$FILE")  # 2010:07:02 08:36:20
  44                 if [ $? -ne 0 ]; then  # use similar field, e.g. 'Date and Time (original)'
  45                         FIELD=$("${EXIF}" -m "$FILE" | "${GREP}" "$FIELD_NAME" | head -n1)
  46                         FIELD_NAME=$(echo "$FIELD" | "${SED}" 's/\t.*//')
  47                         if [ -z "$FIELD_NAME" ]; then
  48                                 echo "$FILE has no stored date"
  49                                 ASCII_DATE=""
  50                         else
  51                                 echo "$FILE using date from $FIELD_NAME"
  52                                 ASCII_DATE=$("${EXIF}" -m -t "$FIELD_NAME" "$FILE")  # 2010:07:02 08:36:20
  53                         fi
  54                 fi
  55                 DATE=$(echo "$ASCII_DATE" | "${SED}" 's/:/./g' | "${SED}" 's/ /./g')
  56                 if [ -z "$DATE" ]; then
  57                         echo "$FILE has no stored date"
  58                 else
  59                         echo "$FILE taken on \"$DATE\""
  60                         FILE_DIR=$("${DIRNAME}" "$FILE")
  61                         NEW_NAME="$FILE_DIR/$DATE.jpg"
  62                         if [ -e "$NEW_NAME" ] && [ "$NEW_NAME" != "$FILE" ]; then
  63                                 i=1
  64                                 NEW_NAME="$FILE_DIR/${DATE}_$i.jpg"
  65                                 while [ -e "$NEW_NAME" ] && [ "$NEW_NAME" != "$FILE" ]; do
  66                                         echo "File \"$NEW_NAME\" already exists!"
  67                                         NEW_NAME="$FILE_DIR/${DATE}_$i.jpg"
  68                                         let "i += 1"
  69                                 done
  70                         fi
  71                         if [ "$NEW_NAME" != "$FILE" ]; then
  72                                 "${MV}" "$FILE" "$NEW_NAME"
  73                                 BASE="${FILE%.*}"
  74                                 NEW_BASE="${NEW_NAME%.*}"
  75                                 for AUXILIARY in "${BASE}"*; do
  76                                         if [ "${AUXILIARY}" != "${BASE}*" ]; then
  77                                                 EXTENSION="${AUXILIARY:${#BASE}}"
  78                                                 NEW_AUXILIARY="${NEW_BASE}${EXTENSION}"
  79                                                 echo "Auxiliary file ${AUXILIARY} -> ${NEW_AUXILIARY}"
  80                                                 "${MV}" "${AUXILIARY}" "${NEW_AUXILIARY}"
  81                                         fi
  82                                 done
  83                         fi
  84                 fi
  85         fi
  86         shift
  87 done