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use serde::de::{Deserializer, Deserialize, Error as SerdeError};
use self::super::super::Error;
use std::iter::FromIterator;
use std::path::PathBuf;
use std::str::FromStr;
use std::ops::Deref;
use std::fs::File;
use std::io::Read;
use std::fmt;
#[derive(Debug, Clone, Hash, PartialEq, Eq, PartialOrd, Ord)]
pub struct TagName(String);
impl TagName {
pub fn load_additional_post_tags(post_root: &(String, PathBuf)) -> Result<Vec<TagName>, Error> {
let mut buf = String::new();
if let Ok(f) = File::open(post_root.1.join("tags")) {
f
} else {
return Ok(Default::default());
}.read_to_string(&mut buf)
.map_err(|_| {
Error::Io {
desc: "additional post tags".into(),
op: "read",
more: "not UTF-8".into(),
}
})?;
Result::from_iter(buf.split(|c: char| c.is_whitespace()).filter(|s| !s.trim().is_empty()).map(TagName::from_str))
}
}
impl FromStr for TagName {
type Err = Error;
fn from_str(s: &str) -> Result<Self, Self::Err> {
let s = s.trim();
if !s.is_empty() && !s.contains(|c: char| c.is_whitespace() || c.is_control()) {
Ok(TagName(s.to_string()))
} else {
Err(Error::Parse {
tp: "non-empty WS- and controlless string",
wher: "post tag name".into(),
more: format!("\"{}\" invalid", s).into(),
})
}
}
}
impl<'de> Deserialize<'de> for TagName {
fn deserialize<D: Deserializer<'de>>(deserializer: D) -> Result<Self, D::Error> {
TagName::from_str(<&'de str>::deserialize(deserializer)?).map_err(|e| {
let buf = e.to_string();
D::Error::custom(&buf[..buf.len() - 1])
})
}
}
impl fmt::Display for TagName {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
self.0.fmt(f)
}
}
impl Deref for TagName {
type Target = str;
fn deref(&self) -> &str {
&self.0
}
}