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Merge pull request #426 from matthiasbeyer/libimagentrymarkdown/init 

Libimagentrymarkdown/init
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Matthias Beyer 2016-06-13 20:23:15 +02:00 committed by GitHub
parent af88d64f44 db93f01ea3
commit c986d8f217
7 changed files with 280 additions and 0 deletions
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17
libimagentrymarkdown/Cargo.toml Normal file
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[package]
name = "libimagentrymarkdown"
version = "0.1.0"
authors = ["Matthias Beyer <mail@beyermatthias.de>"]
[dependencies]
log = "0.3"
hoedown = "5.0.0"
crossbeam = "0.2"
url = "1.1"
[dependencies.libimagstore]
path = "../libimagstore"
[dependencies.libimagerror]
path = "../libimagerror"

9
libimagentrymarkdown/README.md Normal file
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# libimagentrymarkdown
Helper crate to add useful functionality in a wrapper around
[hoedown](https://crates.io/crates/hoedown) for imag.
Adds functionality to extract links, parse content into HTML and other things
which might be useful for markdown rendering in imag.

11
libimagentrymarkdown/src/error.rs Normal file
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generate_error_module!(
generate_error_types!(MarkdownError, MarkdownErrorKind,
MarkdownRenderError => "Markdown render error",
LinkParsingError => "Link parsing error"
);
);
pub use self::error::MarkdownError;
pub use self::error::MarkdownErrorKind;

82
libimagentrymarkdown/src/html.rs Normal file
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use hoedown::{Markdown, Html as MdHtml};
use hoedown::renderer::html::Flags as HtmlFlags;
use hoedown::renderer::Render;
use result::Result;
use error::MarkdownErrorKind;
use libimagerror::into::IntoError;
pub type HTML = String;
pub fn to_html(buffer: &str) -> Result<HTML> {
let md = Markdown::new(buffer);
let mut html = MdHtml::new(HtmlFlags::empty(), 0);
html.render(&md)
.to_str()
.map(String::from)
.map_err(Box::new)
.map_err(|e| MarkdownErrorKind::MarkdownRenderError.into_error_with_cause(e))
}
pub mod iter {
use result::Result;
use libimagstore::store::Entry;
use super::HTML;
use super::to_html;
pub struct ToHtmlIterator<I: Iterator<Item = Entry>> {
i: I
}
impl<I: Iterator<Item = Entry>> ToHtmlIterator<I> {
fn new(i: I) -> ToHtmlIterator<I> {
ToHtmlIterator { i: i }
}
}
impl<I: Iterator<Item = Entry>> Iterator for ToHtmlIterator<I> {
type Item = Result<HTML>;
fn next(&mut self) -> Option<Self::Item> {
self.i.next().map(|entry| to_html(&entry.get_content()[..]))
}
}
impl<I: Iterator<Item = Entry>> From<I> for ToHtmlIterator<I> {
fn from(obj: I) -> ToHtmlIterator<I> {
ToHtmlIterator::new(obj)
}
}
/// Iterate over `(Entry, Result<HTML>)` tuples
pub struct WithHtmlIterator<I: Iterator<Item = Entry>> {
i: I
}
impl<I: Iterator<Item = Entry>> WithHtmlIterator<I> {
fn new(i: I) -> WithHtmlIterator<I> {
WithHtmlIterator { i: i }
}
}
impl<I: Iterator<Item = Entry>> Iterator for WithHtmlIterator<I> {
type Item = (Entry, Result<HTML>);
fn next(&mut self) -> Option<Self::Item> {
self.i.next().map(|entry| {
let html = to_html(&entry.get_content()[..]);
(entry, html)
})
}
}
}

12
libimagentrymarkdown/src/lib.rs Normal file
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#[macro_use] extern crate log;
extern crate crossbeam;
extern crate hoedown;
extern crate url;
extern crate libimagstore;
#[macro_use] extern crate libimagerror;
pub mod error;
pub mod html;
pub mod link;
pub mod result;

143
libimagentrymarkdown/src/link.rs Normal file
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use error::MarkdownErrorKind as MEK;
use result::Result;
use hoedown::renderer::Render;
use hoedown::Buffer;
use hoedown::Markdown;
use url::Url;
use libimagerror::into::IntoError;
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct Link {
pub title: String,
pub link: String,
}
impl Link {
/// Translate a `Link` into a `UrlLink`
fn into_urllink(self) -> Result<UrlLink> {
Url::parse(&self.link[..])
.map(move |link| UrlLink { title: self.title, link: link, })
.map_err(Box::new)
.map_err(|e| MEK::LinkParsingError.into_error_with_cause(e))
}
}
pub struct UrlLink {
pub title: String,
pub link: Url,
}
struct LinkExtractor {
links: Vec<Link>,
}
impl LinkExtractor {
pub fn new() -> LinkExtractor {
LinkExtractor { links: vec![] }
}
pub fn links(self) -> Vec<Link> {
self.links
}
}
impl Render for LinkExtractor {
fn link(&mut self,
_: &mut Buffer,
content: Option<&Buffer>,
link: Option<&Buffer>,
_: Option<&Buffer>)
-> bool
{
let link = link.and_then(|l| l.to_str().ok()).map(String::from);
let content = content.and_then(|l| l.to_str().ok()).map(String::from);
match (link, content) {
(Some(link), Some(content)) => {
self.links.push(Link { link: link, title: content });
false
},
(_, _) => {
false
},
}
}
}
pub fn extract_links(buf: &str) -> Vec<Link> {
let mut le = LinkExtractor::new();
le.render(&Markdown::new(buf));
le.links()
}
#[cfg(test)]
mod test {
use super::{Link, extract_links};
#[test]
fn test_one_link() {
let testtext = "Some [example text](http://example.com).";
let exp = Link {
title: String::from("example text"),
link: String::from("http://example.com"),
};
let mut links = extract_links(testtext);
assert_eq!(1, links.len());
assert_eq!(exp, links.pop().unwrap())
}
#[test]
fn test_two_similar_links() {
let testtext = r#"
Some [example text](http://example.com).
Some more [example text](http://example.com).
"#;
let exp = Link {
title: String::from("example text"),
link: String::from("http://example.com"),
};
let mut links = extract_links(&testtext[..]);
assert_eq!(2, links.len());
assert_eq!(exp, links.pop().unwrap());
assert_eq!(exp, links.pop().unwrap());
}
#[test]
fn test_two_links() {
let testtext = r#"
Some [example text](http://example.com).
Some more [foo](http://example.com/foo).
"#;
let exp1 = Link {
title: String::from("example text"),
link: String::from("http://example.com"),
};
let exp2 = Link {
title: String::from("foo"),
link: String::from("http://example.com/foo"),
};
let mut links = extract_links(&testtext[..]);
assert_eq!(2, links.len());
assert_eq!(exp2, links.pop().unwrap());
assert_eq!(exp1, links.pop().unwrap());
}
}

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libimagentrymarkdown/src/result.rs Normal file
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use std::result::Result as RResult;
use error::MarkdownError;
pub type Result<T> = RResult<T, MarkdownError>;