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1 #!/bin/bash |
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2 |
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3 # Relational pipes |
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4 # Copyright © 2020 František Kučera (Frantovo.cz, GlobalCode.info) |
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5 # |
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6 # This program is free software: you can redistribute it and/or modify |
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7 # it under the terms of the GNU General Public License as published by |
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8 # the Free Software Foundation, version 3 of the License. |
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9 # |
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10 # This program is distributed in the hope that it will be useful, |
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11 # but WITHOUT ANY WARRANTY; without even the implied warranty of |
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12 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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13 # GNU General Public License for more details. |
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14 # |
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15 # You should have received a copy of the GNU General Public License |
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16 # along with this program. If not, see <http://www.gnu.org/licenses/>. |
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17 |
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18 |
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19 # This streamlet provides a single attribute: number of lines of given file |
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20 # Standard wc -l is used to count the lines. |
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21 # Directories are reported a 0 lines and with a null flag (will be supported in further Relational pipes versions). |
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22 |
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23 |
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24 . "$(dirname $0)/streamlet-common.sh" |
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25 |
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26 processMessage_WAITING_FOR_OUTPUT_ATTRIBUTES_METADATA() { |
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27 send OUTPUT_ATTRIBUTE_METADATA "${outputAttributeAliases[0]-lines_count}" "integer" |
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28 send WAITING_FOR_INPUT_ATTRIBUTES |
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29 } |
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30 |
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31 processMessage_WAITING_FOR_OUTPUT_ATTRIBUTES() { |
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32 if [[ -d "$currentFile" ]]; then |
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33 value="0"; |
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34 isNull="true"; |
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35 else |
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36 value=$(wc -l "$currentFile" | cut -d" " -f1); |
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37 isNull="false"; |
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38 fi |
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39 |
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40 send OUTPUT_ATTRIBUTE "$value" "$isNull"; |
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41 send WAITING_FOR_INPUT_ATTRIBUTES; |
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42 } |
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43 |
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44 initialize |
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45 processMessages |