bat/src/inputfile.rs

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Rust
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use std::fs::File;
use std::io::{self, BufRead, BufReader};
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use content_inspector::{self, ContentType};
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use errors::*;
const THEME_PREVIEW_FILE: &[u8] = include_bytes!("../assets/theme_preview.rs");
pub struct InputFileReader<'a> {
inner: Box<dyn BufRead + 'a>,
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pub first_line: Vec<u8>,
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pub content_type: ContentType,
}
impl<'a> InputFileReader<'a> {
fn new<R: BufRead + 'a>(mut reader: R) -> Result<InputFileReader<'a>> {
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let mut first_line = vec![];
if reader.read_until(b'\n', &mut first_line)? == 0 {
return Err(ErrorKind::ImmediateEOF.into());
}
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let content_type = content_inspector::inspect(&first_line[..]);
if content_type == ContentType::UTF_16LE {
reader.read_until(0x00, &mut first_line).ok();
}
Ok(InputFileReader {
inner: Box::new(reader),
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first_line,
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content_type,
})
}
pub fn read_line(&mut self, buf: &mut Vec<u8>) -> io::Result<bool> {
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if self.first_line.is_empty() {
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let res = self.inner.read_until(b'\n', buf).map(|size| size > 0)?;
if self.content_type == ContentType::UTF_16LE {
self.inner.read_until(0x00, buf).ok();
}
Ok(res)
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} else {
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buf.append(&mut self.first_line);
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Ok(true)
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}
}
}
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#[derive(Debug, Clone, Copy, PartialEq)]
pub enum InputFile<'a> {
StdIn,
Ordinary(&'a str),
ThemePreviewFile,
}
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impl<'a> InputFile<'a> {
pub fn get_reader(&self, stdin: &'a io::Stdin) -> Result<InputFileReader> {
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match self {
InputFile::StdIn => InputFileReader::new(stdin.lock()),
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InputFile::Ordinary(filename) => {
let file = File::open(filename).map_err(|e| format!("'{}': {}", filename, e))?;
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if file.metadata()?.is_dir() {
return Err(format!("'{}' is a directory.", filename).into());
}
InputFileReader::new(BufReader::new(file))
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}
InputFile::ThemePreviewFile => InputFileReader::new(THEME_PREVIEW_FILE),
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}
}
}
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#[test]
fn basic() {
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let content = b"#!/bin/bash\necho hello";
let mut reader = InputFileReader::new(&content[..]).unwrap();
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assert_eq!(b"#!/bin/bash\n", &reader.first_line[..]);
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let mut buffer = vec![];
let res = reader.read_line(&mut buffer);
assert!(res.is_ok());
assert_eq!(true, res.unwrap());
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assert_eq!(b"#!/bin/bash\n", &buffer[..]);
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buffer.clear();
let res = reader.read_line(&mut buffer);
assert!(res.is_ok());
assert_eq!(true, res.unwrap());
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assert_eq!(b"echo hello", &buffer[..]);
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buffer.clear();
let res = reader.read_line(&mut buffer);
assert!(res.is_ok());
assert_eq!(false, res.unwrap());
assert!(buffer.is_empty());
}
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#[test]
fn utf16le() {
let content = b"\xFF\xFE\x73\x00\x0A\x00\x64\x00";
let mut reader = InputFileReader::new(&content[..]).unwrap();
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assert_eq!(b"\xFF\xFE\x73\x00\x0A\x00", &reader.first_line[..]);
let mut buffer = vec![];
let res = reader.read_line(&mut buffer);
assert!(res.is_ok());
assert_eq!(true, res.unwrap());
assert_eq!(b"\xFF\xFE\x73\x00\x0A\x00", &buffer[..]);
buffer.clear();
let res = reader.read_line(&mut buffer);
assert!(res.is_ok());
assert_eq!(true, res.unwrap());
assert_eq!(b"\x64\x00", &buffer[..]);
buffer.clear();
let res = reader.read_line(&mut buffer);
assert!(res.is_ok());
assert_eq!(false, res.unwrap());
assert!(buffer.is_empty());
}