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use std::fs::File;
use std::io::prelude::*;
use std::io;
use std::path::{PathBuf, Path};
use std::str;
#[derive(Clone)]
pub struct ExternalHtml{
pub in_header: String,
pub before_content: String,
pub after_content: String
}
impl ExternalHtml {
pub fn load(in_header: &[String], before_content: &[String], after_content: &[String])
-> Option<ExternalHtml> {
match (load_external_files(in_header),
load_external_files(before_content),
load_external_files(after_content)) {
(Some(ih), Some(bc), Some(ac)) => Some(ExternalHtml {
in_header: ih,
before_content: bc,
after_content: ac
}),
_ => None
}
}
}
pub fn load_string(input: &Path) -> io::Result<Option<String>> {
let mut f = try!(File::open(input));
let mut d = Vec::new();
try!(f.read_to_end(&mut d));
Ok(str::from_utf8(&d).map(|s| s.to_string()).ok())
}
macro_rules! load_or_return {
($input: expr, $cant_read: expr, $not_utf8: expr) => {
{
let input = PathBuf::from(&$input[..]);
match ::externalfiles::load_string(&input) {
Err(e) => {
let _ = writeln!(&mut io::stderr(),
"error reading `{}`: {}", input.display(), e);
return $cant_read;
}
Ok(None) => {
let _ = writeln!(&mut io::stderr(),
"error reading `{}`: not UTF-8", input.display());
return $not_utf8;
}
Ok(Some(s)) => s
}
}
}
}
pub fn load_external_files(names: &[String]) -> Option<String> {
let mut out = String::new();
for name in names {
out.push_str(&*load_or_return!(&name, None, None));
out.push('\n');
}
Some(out)
}