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Introduce a pagination object to render search result.

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This commit is contained in:
Matthieu Gautier
2022-05-23 19:12:17 +02:00
parent cb62da65c3
commit bbdde93f49
5 changed files with 294 additions and 69 deletions
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105
src/search_renderer.cpp
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@ -86,8 +86,69 @@ void SearchRenderer::setSearchProtocolPrefix(const std::string& prefix)
this->searchProtocolPrefix = prefix;
}
kainjow::mustache::data buildPagination(
unsigned int pageLength,
unsigned int resultsCount,
unsigned int resultsStart
)
{
assert(pageLength!=0);
kainjow::mustache::data pagination;
kainjow::mustache::data pages{kainjow::mustache::data::type::list};
if (resultsCount == 0) {
// Easy case
pagination.set("itemsPerPage", to_string(pageLength));
pagination.set("hasPages", false);
pagination.set("pages", pages);
return pagination;
}
// First we want to display pages starting at a multiple of `pageLength`
// so, let's calculate the start index of the current page.
auto currentPage = resultsStart/pageLength;
auto lastPage = ((resultsCount-1)/pageLength);
auto lastPageStart = lastPage*pageLength;
auto nbPages = lastPage + 1;
auto firstPageGenerated = currentPage > 4 ? currentPage-4 : 0;
auto lastPageGenerated = min(currentPage+4, lastPage);
if (nbPages != 1) {
if (firstPageGenerated!=0) {
kainjow::mustache::data page;
page.set("label", "◀");
page.set("start", to_string(0));
page.set("current", false);
pages.push_back(page);
}
for (auto i=firstPageGenerated; i<=lastPageGenerated; i++) {
kainjow::mustache::data page;
page.set("label", to_string(i+1));
page.set("start", to_string(i*pageLength));
page.set("current", bool(i == currentPage));
pages.push_back(page);
}
if (lastPageGenerated!=lastPage) {
kainjow::mustache::data page;
page.set("label", "▶");
page.set("start", to_string(lastPageStart));
page.set("current", false);
pages.push_back(page);
}
}
pagination.set("itemsPerPage", to_string(pageLength));
pagination.set("hasPages", firstPageGenerated < lastPageGenerated);
pagination.set("pages", pages);
return pagination;
}
std::string SearchRenderer::getHtml()
{
// Build the results list
kainjow::mustache::data results{kainjow::mustache::data::type::list};
for (auto it = m_srs.begin(); it != m_srs.end(); it++) {
@ -110,57 +171,31 @@ std::string SearchRenderer::getHtml()
results.push_back(result);
}
// pages
kainjow::mustache::data pages{kainjow::mustache::data::type::list};
auto resultEnd = 0U;
auto currentPage = 0U;
auto pageStart = 0U;
auto pageEnd = 0U;
auto lastPageStart = 0U;
if (pageLength) {
currentPage = resultStart/pageLength;
pageStart = currentPage > 4 ? currentPage-4 : 0;
pageEnd = currentPage + 5;
if (pageEnd > estimatedResultCount / pageLength) {
pageEnd = (estimatedResultCount + pageLength - 1) / pageLength;
}
if (estimatedResultCount > pageLength) {
lastPageStart = ((estimatedResultCount-1)/pageLength)*pageLength;
}
}
// pagination
auto pagination = buildPagination(
pageLength,
estimatedResultCount,
resultStart
);
resultEnd = resultStart+pageLength; //setting result end
for (unsigned int i = pageStart; i < pageEnd; i++) {
kainjow::mustache::data page;
page.set("label", to_string(i + 1));
page.set("start", to_string(i * pageLength));
if (i == currentPage) {
page.set("selected", true);
}
pages.push_back(page);
}
auto resultEnd = min(resultStart+pageLength, estimatedResultCount);
std::string template_str = RESOURCE::templates::search_result_html;
kainjow::mustache::mustache tmpl(template_str);
kainjow::mustache::data allData;
allData.set("results", results);
allData.set("pages", pages);
allData.set("hasResults", estimatedResultCount != 0);
allData.set("hasPages", pageStart + 1 < pageEnd);
allData.set("count", kiwix::beautifyInteger(estimatedResultCount));
allData.set("searchPattern", kiwix::encodeDiples(this->searchPattern));
allData.set("searchPatternEncoded", urlEncode(this->searchPattern));
allData.set("resultStart", to_string(resultStart + 1));
allData.set("resultEnd", to_string(min(resultEnd, estimatedResultCount)));
allData.set("pageLength", to_string(pageLength));
allData.set("resultLastPageStart", to_string(lastPageStart));
allData.set("resultEnd", to_string(resultEnd));
allData.set("protocolPrefix", this->protocolPrefix);
allData.set("searchProtocolPrefix", this->searchProtocolPrefix);
allData.set("contentId", this->searchContent);
allData.set("pagination", pagination);
std::stringstream ss;
tmpl.render(allData, [&ss](const std::string& str) { ss << str; });