1 #!/bin/bash

     2 

     3 # Relational pipes

     4 # Copyright © 2020 František Kučera (Frantovo.cz, GlobalCode.info)

     5 #

     6 # This program is free software: you can redistribute it and/or modify

     7 # it under the terms of the GNU General Public License as published by

     8 # the Free Software Foundation, version 3 of the License.

     9 #

    10 # This program is distributed in the hope that it will be useful,

    11 # but WITHOUT ANY WARRANTY; without even the implied warranty of

    12 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

    13 # GNU General Public License for more details.

    14 #

    15 # You should have received a copy of the GNU General Public License

    16 # along with this program. If not, see <http://www.gnu.org/licenses/>.

    17 

    18 

    19 # This streamlet provides EXIF metadata. It calls the tool exiv2.

    20 # With no options it returns "Image size", "Copyright" and "Exif comment" attributes.

    21 # Specific attributes can be selected using options – e.g. --option 'attribute' 'Image size'

    22 # List of available attributes can be obtained by directly calling the exiv2 command on a image file.

    23 # Two additional attributes are provided by this streamlet: "Image height" and "Image width" (they are extracted from "Image size").

    24 

    25 

    26 . "$(dirname $0)/streamlet-common.sh"

    27 

    28 processMessage_WAITING_FOR_OUTPUT_ATTRIBUTES_METADATA() {

    29 	streamletFields=()

    30 

    31 	for (( i=0; i<${#optionNames[@]}; i++)); do

    32 		if [[ "x${optionNames[$i]}" == "xattribute" ]]; then

    33 			streamletFields+=("${optionValues[$i]}");

    34 		elif [[ "x${optionNames[$i]}" == "xprefix" ]]; then

    35 			pdfPrefix="${optionValues[$i]}";

    36 		else

    37 			echo "Unsupported option: ${optionNames[$i]}" >&2

    38 		fi

    39 	done

    40 

    41 	if [[ -z "$streamletFields" ]]; then

    42 		streamletFields=( "Image size" "Copyright" "Exif comment" );

    43 	fi

    44 

    45 	for (( i=0; i<${#streamletFields[@]}; i++)); do

    46 		if [[ "x${streamletFields[$i]}" == "xImage height" ]] ||[[ "x${streamletFields[$i]}" == "xImage width" ]]; then local type="integer"; else local type="string"; fi

    47 		send OUTPUT_ATTRIBUTE_METADATA "${outputAttributeAliases[$i]-$pdfPrefix${streamletFields[$i]}}"    "$type"

    48 	done

    49 

    50 	send WAITING_FOR_INPUT_ATTRIBUTES

    51 }

    52 

    53 processMessage_WAITING_FOR_OUTPUT_ATTRIBUTES() {

    54 	local streamletInfo streamletValid value isNull;

    55 

    56 	[[ -d "$currentFile" ]] || streamletInfo="$(exiv2 "$currentFile")";

    57 	streamletValid="$?";

    58 

    59 	for (( i=0; i<${#streamletFields[@]}; i++)); do

    60 		value="$(echo "$streamletInfo" | grep -P "^\Q${streamletFields[$i]}\E\s*:" | sed -E 's/[^:]+:\s+(.*)/\1/g' | tr -d '\n';)"; # the field name must not contain "\E"

    61 

    62 		if   [[ -z "$value" ]] && [[ "x${streamletFields[$i]}" == "xImage width"  ]]; then value="$(echo "$streamletInfo" | grep -E 'Image size\s*:\s*[0-9]+ x [0-9]+' | sed -E 's/Image size\s*:\s*([0-9]+) x ([0-9]+)/\1/g')";

    63 		elif [[ -z "$value" ]] && [[ "x${streamletFields[$i]}" == "xImage height" ]]; then value="$(echo "$streamletInfo" | grep -E 'Image size\s*:\s*[0-9]+ x [0-9]+' | sed -E 's/Image size\s*:\s*([0-9]+) x ([0-9]+)/\2/g')";

    64 		fi

    65 

    66 		# n.b. if file has no exif data, exiv2 exits with error „No Exif data found in the file“ and thus $streamletValid != 0, but there still might be some value like „Image size“

    67 		if   [[ ! "x$streamletValid" == "x0" ]] && [[ "x$value" == "x" ]]; then value="";  isNull="true";

    68 		else                                                                               isNull="false";

    69 		fi

    70 

    71 		if ( [[ "x${streamletFields[$i]}" == "xImage height" ]] || [[ "x${streamletFields[$i]}" == "xImage width" ]] ) && [[ ! "$value" =~ ^[0-9]+$ ]]; then value="0"; isNull="true"; fi

    72 

    73 		send OUTPUT_ATTRIBUTE "$value"    "$isNull";

    74 	done

    75 	

    76 	send WAITING_FOR_INPUT_ATTRIBUTES;

    77 }

    78 

    79 initialize

    80 processMessages