scripts/get_merged_element.sh

   1 #!/bin/bash
   2
   3 # get_merged_element.sh - Return an element in wdef:knowledge after it's been
   4 #                         merged with a RDF.
   5 # Copyright (C) 2022  Pierre Choffet
   6 #
   7 # This program is free software: you can redistribute it and/or modify
   8 # it under the terms of version 3 of the GNU General Public License as
   9 # published by the Free Software Foundation.
  10 #
  11 # This program is distributed in the hope that it will be useful,
  12 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 # GNU General Public License for more details.
  15 #
  16 # You should have received a copy of the GNU General Public License
  17 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18
  19 readonly SCRIPT_DIR="$(dirname "$0")"
  20
  21 source "${SCRIPT_DIR}/rdf.sh"
  22
  23 set -euo pipefail
  24
  25 # Any rdf cache older than this (in minutes) will be updated
  26 RDFS_MAX_AGE=${RDFS_MAX_AGE:=1440}
  27
  28 readonly CANONICALIZE_XSLT_PATH="${SCRIPT_DIR}/../xslts/canonicalize.xslt"
  29 readonly MERGE_XSLT_PATH="${SCRIPT_DIR}/../xslts/merge_rdf.xslt"
  30
  31 function usage() {
  32         cat << EOF
  33 USAGE: get_merged_element.sh <wdef_path> <QID>
  34
  35 Merge a RDF into an element inside a wdef file. A wdef file containing this
  36 single element is returned.
  37 EOF
  38 }
  39
  40 if [ "$#" -ne 2 ]
  41 then
  42         usage >&2
  43         exit 1
  44 fi
  45
  46 readonly WDEF_PATH="${1}"
  47 readonly ELEMENT_QID="${2}"
  48
  49 # Check wdef exists
  50 if [ ! -s "${WDEF_PATH}" ]
  51 then
  52         echo "WDEF file doesn't exist. Exiting" >&2
  53         exit
  54 fi
  55
  56 # Export element from wdef
  57 readonly ELEMENT_PATH="$(mktemp)"
  58 xmlstarlet sel -D -t -e 'wdef:knowledge' -m '/wdef:knowledge' -c "wdef:element[@wdef:id = '${ELEMENT_QID}']" "${WDEF_PATH}" | xmlstarlet fo - > "${ELEMENT_PATH}"
  59
  60 # Check element is in temp file
  61 if [ "$(xmlstarlet sel -t -i "/wdef:knowledge/wdef:element[@wdef:id = '${ELEMENT_QID}']" -v "'true'" "${ELEMENT_PATH}")" != 'true' ]
  62 then
  63         echo "Element not available in wdef. Exiting." >&2
  64         exit
  65 fi
  66
  67 # Cache RDF
  68 readonly RDF_PATH=$(cacheRDFMaxAge "${ELEMENT_QID}" "${RDFS_MAX_AGE}")
  69
  70 # Merge and return canonicalized result
  71 xmlstarlet tr "${MERGE_XSLT_PATH}" -s action=reduce \
  72            -s "rdf-path=${RDF_PATH}" \
  73            "${WDEF_PATH}" | xmlstarlet tr ${CANONICALIZE_XSLT_PATH} -
  74
  75 rm "${ELEMENT_PATH}"