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	Copy citation file content, in APA and BibTex format, on repo home page (#19999)
Add feature to easily copy CITATION.cff content in APA and BibTex format.
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								web_src/js/features/citation.js
									
									
									
									
									
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								web_src/js/features/citation.js
									
									
									
									
									
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import $ from 'jquery';
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const {pageData} = window.config;
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const initInputCitationValue = async ($citationCopyBibtex, $citationCopyApa) => {
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  const [{Cite, plugins}] = await Promise.all([
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    import(/* webpackChunkName: "citation-js-core" */'@citation-js/core'),
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    import(/* webpackChunkName: "citation-js-formats" */'@citation-js/plugin-software-formats'),
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    import(/* webpackChunkName: "citation-js-bibtex" */'@citation-js/plugin-bibtex'),
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    import(/* webpackChunkName: "citation-js-bibtex" */'@citation-js/plugin-csl'),
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  ]);
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  const {citationFileContent} = pageData;
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  const config = plugins.config.get('@bibtex');
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  config.constants.fieldTypes.doi = ['field', 'literal'];
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  config.constants.fieldTypes.version = ['field', 'literal'];
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  const citationFormatter = new Cite(citationFileContent);
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  const lang = document.documentElement.lang || 'en-US';
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  const apaOutput = citationFormatter.format('bibliography', {template: 'apa', lang});
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  const bibtexOutput = citationFormatter.format('bibtex', {lang});
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  $citationCopyBibtex.attr('data-text', bibtexOutput);
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  $citationCopyApa.attr('data-text', apaOutput);
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};
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export function initCitationFileCopyContent() {
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  const defaultCitationFormat = 'apa'; // apa or bibtex
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  if (!pageData.citationFileContent) return;
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  const $citationCopyApa = $('#citation-copy-apa');
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  const $citationCopyBibtex = $('#citation-copy-bibtex');
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  const $inputContent = $('#citation-copy-content');
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  if ((!$citationCopyApa.length && !$citationCopyBibtex.length) || !$inputContent.length) return;
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  const updateUi = () => {
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    const isBibtex = (localStorage.getItem('citation-copy-format') || defaultCitationFormat) === 'bibtex';
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    const copyContent = (isBibtex ? $citationCopyBibtex : $citationCopyApa).attr('data-text');
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    $inputContent.val(copyContent);
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    $citationCopyBibtex.toggleClass('primary', isBibtex);
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    $citationCopyApa.toggleClass('primary', !isBibtex);
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  };
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  initInputCitationValue($citationCopyApa, $citationCopyBibtex).then(updateUi);
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  $citationCopyApa.on('click', () => {
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    localStorage.setItem('citation-copy-format', 'apa');
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    updateUi();
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  });
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  $citationCopyBibtex.on('click', () => {
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    localStorage.setItem('citation-copy-format', 'bibtex');
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    updateUi();
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  });
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  $inputContent.on('click', () => {
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    $inputContent.select();
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  });
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  $('#cite-repo-button').on('click', () => {
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    $('#cite-repo-modal').modal('show');
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  });
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}
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