328 lines
9.1 KiB
Rust
328 lines
9.1 KiB
Rust
use chrono::{DateTime, NaiveDateTime, Timelike, Utc};
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use once_cell::sync::OnceCell;
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use regex::Regex;
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use std::borrow::Cow;
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use std::path::PathBuf;
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use std::result::Result as StdResult;
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use std::slice::IterMut;
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use anyhow::{anyhow, Error, Result};
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use atom_syndication::{Entry as AtomEntry, Feed as AtomFeed};
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use germ::ast::{Ast as GemtextAst, Node as GemtextNode};
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use germ::convert::{self as germ_convert, Target};
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use germ::request::{request as gemini_request, Response as GeminiResponse};
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use url::Url;
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fn parse_gemfeed_gemtext(base_url: &Url, gemfeed: &GemtextAst) -> Vec<GemfeedEntry> {
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gemfeed
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.inner()
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.into_iter()
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.filter_map(|node| GemfeedEntry::from_ast(base_url, node))
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.collect()
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}
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fn parse_gemfeed_atom(feed: &str) -> Result<Vec<GemfeedEntry>> {
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let feed = feed.parse::<AtomFeed>()?;
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let entries = feed
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.entries()
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.into_iter()
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.filter_map(|entry| GemfeedEntry::from_atom(entry))
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.collect::<Vec<_>>();
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Ok(entries)
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}
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enum GemfeedType {
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Gemtext,
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Atom,
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Unknown,
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}
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impl GemfeedType {
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const ATOM_MIME_TYPES: &'static [&'static str] = &["text/xml", "application/atom+xml"];
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}
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impl From<Cow<'_, str>> for GemfeedType {
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// See https://github.com/gemrest/germ/issues/2. Will be converted
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// to use germ Meta struct after this is fixed.
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fn from(mime: Cow<'_, str>) -> Self {
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let is_atom = Self::ATOM_MIME_TYPES
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.into_iter()
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.any(|atom_mime| mime.contains(atom_mime));
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if is_atom {
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GemfeedType::Atom
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} else if mime.contains("text/gemini") {
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GemfeedType::Gemtext
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} else {
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GemfeedType::Unknown
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}
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}
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}
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#[derive(Debug)]
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pub struct Gemfeed {
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url: Url,
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entries: Vec<GemfeedEntry>,
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}
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#[allow(dead_code)]
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impl Gemfeed {
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pub fn new(url: &Url, entries: Vec<GemfeedEntry>) -> Gemfeed {
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Gemfeed {
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url: url.clone(),
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entries,
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}
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}
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pub fn load(url: &Url) -> Result<Gemfeed> {
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let resp = gemini_request(url)?;
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match GemfeedType::from(resp.meta()) {
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GemfeedType::Gemtext => Self::load_from_gemtext(url, resp),
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GemfeedType::Atom => Self::load_from_atom(url, resp),
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_ => Err(anyhow!(
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"Unrecognized Gemfeed mime type [meta={}]",
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resp.meta()
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)),
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}
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}
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fn load_from_atom(url: &Url, resp: GeminiResponse) -> Result<Gemfeed> {
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if let Some(content) = resp.content() {
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let entries = parse_gemfeed_atom(content)?;
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Ok(Self::new(url, entries))
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} else {
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Err(anyhow!("Not a valid Atom Gemfeed"))
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}
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}
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fn load_from_gemtext(url: &Url, resp: GeminiResponse) -> Result<Gemfeed> {
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let maybe_feed = resp
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.content()
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.to_owned()
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.map(|text| GemtextAst::from_value(&text));
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// TODO should be some actual validation of the feed here.
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if let Some(ref feed) = maybe_feed {
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let entries = parse_gemfeed_gemtext(url, feed);
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Ok(Self::new(url, entries))
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} else {
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Err(anyhow!("Not a valid Gemtextg Gemfeed"))
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}
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}
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pub fn slugs(&self) -> Vec<String> {
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self.entries()
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.map(|entry| entry.slug().to_owned())
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.collect()
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}
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pub fn url(&self) -> &Url {
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&self.url
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}
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pub fn entries(&self) -> impl Iterator<Item = &GemfeedEntry> {
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self.entries.iter()
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}
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pub fn entries_mut(&mut self) -> IterMut<GemfeedEntry> {
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self.entries.iter_mut()
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}
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pub fn find_entry_by_slug<S: AsRef<str>>(&self, slug: S) -> Option<&GemfeedEntry> {
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let slug = slug.as_ref();
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self.entries().find(|entry| entry.slug() == slug)
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}
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pub fn find_mut_entry_by_slug<S: AsRef<str>>(&mut self, slug: S) -> Option<&mut GemfeedEntry> {
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let slug = slug.as_ref();
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self.entries_mut().find(|entry| entry.slug() == slug)
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}
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}
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#[allow(dead_code)]
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#[derive(Debug)]
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pub struct GemfeedEntry {
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title: String,
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slug: String,
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published: Option<DateTime<Utc>>,
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/// Full URL of the gemlog post.
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url: Url,
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/// Must be loaded by calling the body() method.
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body: OnceCell<String>,
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}
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#[allow(dead_code)]
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impl GemfeedEntry {
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pub fn from_ast(base_url: &Url, node: &GemtextNode) -> Option<GemfeedEntry> {
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let link = GemfeedLink::try_from(node).ok()?;
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// Gemfeeds have only the date--lock to 12pm UTC as a guess.
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let publish_date = link
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.published
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.map(|date| NaiveDateTime::parse_from_str(&date, "%Y-%m-%d"))?
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.ok()?
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.with_hour(12)?
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.and_utc();
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Some(GemfeedEntry {
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title: link.title,
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url: base_url.join(&link.path).ok()?,
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slug: link.slug,
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published: Some(publish_date),
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body: OnceCell::new(),
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})
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}
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pub fn from_atom(entry: &AtomEntry) -> Option<GemfeedEntry> {
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let link = GemfeedLink::try_from(entry).ok()?;
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let publish_date = link
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.published
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.map(|date| DateTime::parse_from_rfc3339(&date))?
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.ok()?
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.to_utc();
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Some(GemfeedEntry {
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title: link.title,
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url: Url::parse(&link.path).ok()?,
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slug: link.slug,
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published: Some(publish_date),
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body: OnceCell::new(),
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})
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}
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pub fn title(&self) -> &str {
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&self.title
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}
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pub fn slug(&self) -> &str {
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&self.slug
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}
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pub fn published(&self) -> Option<&DateTime<Utc>> {
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self.published.as_ref()
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}
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/// Full URL of the gemlog post.
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pub fn url(&self) -> &Url {
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&self.url
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}
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pub fn body(&self) -> Result<&String, Error> {
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self.body.get_or_try_init(|| {
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let resp = gemini_request(&self.url)?;
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Ok(resp.content().to_owned().unwrap_or_default())
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})
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}
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pub fn body_mut(&mut self) -> Result<&mut String, Error> {
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// Forces init and also returns the error if init failed.
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if let Err(error) = self.body() {
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return Err(error);
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}
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// Which means that this Should Be Safe™
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Ok(self
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.body
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.get_mut()
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.expect("Body not initialized when it should be"))
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}
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/// The gemtext body of the gemlog post, represented as a
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/// germ::Ast. The body is loaded lazily when this method is first
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/// called.
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pub fn body_as_ast(&self) -> Result<GemtextAst, Error> {
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self.body().map(|text| GemtextAst::from_value(&text))
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}
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pub fn body_as_markdown(&self) -> Result<String, Error> {
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self.body_as_ast()
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.map(|body| germ_convert::from_ast(&body, &Target::Markdown))
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}
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}
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struct GemfeedLink {
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path: String,
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title: String,
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slug: String,
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published: Option<String>,
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}
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impl TryFrom<&GemtextNode> for GemfeedLink {
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type Error = anyhow::Error;
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fn try_from(node: &GemtextNode) -> StdResult<Self, Self::Error> {
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let entry: Option<GemfeedLink> = if let GemtextNode::Link {
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text: Some(title),
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to: path,
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} = node.to_owned()
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{
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let re = Regex::new(r#"(\d\d\d\d-\d\d-\d\d)"#).unwrap();
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let path_buf = PathBuf::from(&path);
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let published: Option<String> = re
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.captures_at(&title, 0)
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.map(|caps| caps.get(0))
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.and_then(|date| date.map(|published| published.as_str().to_owned()));
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let stem = match published {
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Some(_) => path_buf.file_stem(),
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_ => None,
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};
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let maybe_slug = stem.map(|s| s.to_string_lossy());
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maybe_slug.map(|slug| GemfeedLink {
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title,
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path,
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published,
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slug: slug.to_string(),
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})
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} else {
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None
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};
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entry.ok_or(anyhow!("Not a Gemfeed link"))
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}
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}
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impl TryFrom<&AtomEntry> for GemfeedLink {
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type Error = anyhow::Error;
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fn try_from(entry: &AtomEntry) -> StdResult<Self, Self::Error> {
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let link = entry
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.links()
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.iter()
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.find(|link| link.rel == "alternate")
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.map(|link| link.href.clone())
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.ok_or(anyhow!("No post link present"))?;
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let link_url = Url::parse(&link)?;
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let post_filename = link_url
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.path_segments()
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.and_then(|segments| segments.last())
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.map(|filename| PathBuf::from(filename));
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let maybe_slug = match post_filename {
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Some(ref pathbuf) => pathbuf
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.file_stem()
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.map(|stem| stem.to_string_lossy().to_string()),
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_ => None,
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};
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let title = entry.title().to_string();
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let published = entry.published();
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if let Some(slug) = maybe_slug {
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Ok(GemfeedLink {
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path: link.clone(),
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published: published.map(|date| date.to_string()),
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title,
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slug,
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})
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} else {
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Err(anyhow!("Slug could not be calculated: [url={}]", link_url))
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}
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}
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}
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