75 lines
2.2 KiB
Rust
75 lines
2.2 KiB
Rust
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use super::posts::{HtmlContent, Post};
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use super::util::output_rendered_template;
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use askama::Template;
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use std::path::{Path, PathBuf};
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pub trait PaginatableTemplate<'a>: Template {
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fn with_posts(
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&'a self,
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posts: &'a [&'a Post<HtmlContent>],
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pagination_info: PaginationInfo,
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) -> Self;
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}
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#[derive(Default)]
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pub struct PaginationInfo {
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pub page: usize,
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pub total_pages: usize,
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// Relative to path of the file being generated
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pub next_href: Option<String>,
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// Relative to path of the file being generated
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pub prev_href: Option<String>,
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}
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const SIZE: usize = 5;
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pub fn render_paginated<'a, T: PaginatableTemplate<'a>>(
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template: &'a T,
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posts: &'a [&'a Post<HtmlContent>],
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base_path: impl AsRef<Path>,
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) -> Result<(), std::io::Error> {
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// div_ceil is unstable, so we do it ourselves
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let total_pages = (posts.len() as f32 / SIZE as f32).ceil() as usize;
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let mut buf: PathBuf = base_path.as_ref().into();
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for (chunk_idx, chunk) in posts.chunks(SIZE).enumerate() {
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let page = chunk_idx + 1;
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let next_page = if page < total_pages {
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Some(page + 1)
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} else {
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None
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};
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let prev_page = if page > 1 { Some(page - 1) } else { None };
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if page == 1 {
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buf.push("index.html");
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let chunk_template = template.with_posts(
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chunk,
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PaginationInfo {
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page,
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total_pages,
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next_href: next_page.map(|p| format!("./{}/", p)),
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prev_href: None,
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},
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);
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output_rendered_template(&chunk_template, &buf)?;
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buf.pop();
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}
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let chunk_template = template.with_posts(
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chunk,
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PaginationInfo {
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page,
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total_pages,
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next_href: next_page.map(|p| format!("../{}/", p)),
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prev_href: prev_page.map(|p| format!("../{}/", p)),
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},
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);
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buf.push(page.to_string());
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buf.push("index.html");
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output_rendered_template(&chunk_template, &buf)?;
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buf.pop();
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buf.pop();
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}
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Ok(())
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}
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