git.iko.soy/bat
on 6739230 help sign in
bat/src/inputfile.rs
136 lines 3.7 kB history raw
1use std::fs::File;
2use std::io::{self, BufRead, BufReader};
3use std::ffi::OsStr;
5use content_inspector::{self, ContentType};
7use crate::errors::*;
9const THEME_PREVIEW_FILE: &[u8] = include_bytes!("../assets/theme_preview.rs");
11pub struct InputFileReader<'a> {
12 inner: Box<dyn BufRead + 'a>,
13 pub first_line: Vec<u8>,
14 pub content_type: Option<ContentType>,
17impl<'a> InputFileReader<'a> {
18 fn new<R: BufRead + 'a>(mut reader: R) -> InputFileReader<'a> {
19 let mut first_line = vec![];
20 reader.read_until(b'\n', &mut first_line).ok();
22 let content_type = if first_line.is_empty() {
23 None
24 } else {
25 Some(content_inspector::inspect(&first_line[..]))
26 };
28 if content_type == Some(ContentType::UTF_16LE) {
29 reader.read_until(0x00, &mut first_line).ok();
30 }
32 InputFileReader {
33 inner: Box::new(reader),
34 first_line,
35 content_type,
36 }
37 }
39 pub fn read_line(&mut self, buf: &mut Vec<u8>) -> io::Result<bool> {
40 if self.first_line.is_empty() {
41 let res = self.inner.read_until(b'\n', buf).map(|size| size > 0)?;
43 if self.content_type == Some(ContentType::UTF_16LE) {
44 self.inner.read_until(0x00, buf).ok();
45 }
47 Ok(res)
48 } else {
49 buf.append(&mut self.first_line);
50 Ok(true)
51 }
52 }
55#[derive(Debug, Clone, Copy, PartialEq)]
56pub enum InputFile<'a> {
57 StdIn,
58 Ordinary(&'a OsStr),
59 ThemePreviewFile,
62impl<'a> InputFile<'a> {
63 pub fn get_reader(&self, stdin: &'a io::Stdin) -> Result<InputFileReader> {
64 match self {
65 InputFile::StdIn => Ok(InputFileReader::new(stdin.lock())),
66 InputFile::Ordinary(filename) => {
67 let file = File::open(filename).map_err(|e| format!("'{}': {}", filename.to_string_lossy(), e))?;
69 if file.metadata()?.is_dir() {
70 return Err(format!("'{}' is a directory.", filename.to_string_lossy()).into());
71 }
73 Ok(InputFileReader::new(BufReader::new(file)))
74 }
75 InputFile::ThemePreviewFile => Ok(InputFileReader::new(THEME_PREVIEW_FILE)),
76 }
77 }
80#[test]
81fn basic() {
82 let content = b"#!/bin/bash\necho hello";
83 let mut reader = InputFileReader::new(&content[..]);
85 assert_eq!(b"#!/bin/bash\n", &reader.first_line[..]);
87 let mut buffer = vec![];
89 let res = reader.read_line(&mut buffer);
90 assert!(res.is_ok());
91 assert_eq!(true, res.unwrap());
92 assert_eq!(b"#!/bin/bash\n", &buffer[..]);
94 buffer.clear();
96 let res = reader.read_line(&mut buffer);
97 assert!(res.is_ok());
98 assert_eq!(true, res.unwrap());
99 assert_eq!(b"echo hello", &buffer[..]);
101 buffer.clear();
103 let res = reader.read_line(&mut buffer);
104 assert!(res.is_ok());
105 assert_eq!(false, res.unwrap());
106 assert!(buffer.is_empty());
109#[test]
110fn utf16le() {
111 let content = b"\xFF\xFE\x73\x00\x0A\x00\x64\x00";
112 let mut reader = InputFileReader::new(&content[..]);
114 assert_eq!(b"\xFF\xFE\x73\x00\x0A\x00", &reader.first_line[..]);
116 let mut buffer = vec![];
118 let res = reader.read_line(&mut buffer);
119 assert!(res.is_ok());
120 assert_eq!(true, res.unwrap());
121 assert_eq!(b"\xFF\xFE\x73\x00\x0A\x00", &buffer[..]);
123 buffer.clear();
125 let res = reader.read_line(&mut buffer);
126 assert!(res.is_ok());
127 assert_eq!(true, res.unwrap());
128 assert_eq!(b"\x64\x00", &buffer[..]);
130 buffer.clear();
132 let res = reader.read_line(&mut buffer);
133 assert!(res.is_ok());
134 assert_eq!(false, res.unwrap());
135 assert!(buffer.is_empty());