git.iko.soy/bat
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bat/src/inputfile.rs
137 lines 3.8 kB history raw
1use std::ffi::OsStr;
2use std::fs::File;
3use std::io::{self, BufRead, BufReader};
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(crate) first_line: Vec<u8>,
14 pub(crate) 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(crate) 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(crate) 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)
68 .map_err(|e| format!("'{}': {}", filename.to_string_lossy(), e))?;
70 if file.metadata()?.is_dir() {
71 return Err(format!("'{}' is a directory.", filename.to_string_lossy()).into());
72 }
74 Ok(InputFileReader::new(BufReader::new(file)))
75 }
76 InputFile::ThemePreviewFile => Ok(InputFileReader::new(THEME_PREVIEW_FILE)),
77 }
78 }
81#[test]
82fn basic() {
83 let content = b"#!/bin/bash\necho hello";
84 let mut reader = InputFileReader::new(&content[..]);
86 assert_eq!(b"#!/bin/bash\n", &reader.first_line[..]);
88 let mut buffer = vec![];
90 let res = reader.read_line(&mut buffer);
91 assert!(res.is_ok());
92 assert_eq!(true, res.unwrap());
93 assert_eq!(b"#!/bin/bash\n", &buffer[..]);
95 buffer.clear();
97 let res = reader.read_line(&mut buffer);
98 assert!(res.is_ok());
99 assert_eq!(true, res.unwrap());
100 assert_eq!(b"echo hello", &buffer[..]);
102 buffer.clear();
104 let res = reader.read_line(&mut buffer);
105 assert!(res.is_ok());
106 assert_eq!(false, res.unwrap());
107 assert!(buffer.is_empty());
110#[test]
111fn utf16le() {
112 let content = b"\xFF\xFE\x73\x00\x0A\x00\x64\x00";
113 let mut reader = InputFileReader::new(&content[..]);
115 assert_eq!(b"\xFF\xFE\x73\x00\x0A\x00", &reader.first_line[..]);
117 let mut buffer = vec![];
119 let res = reader.read_line(&mut buffer);
120 assert!(res.is_ok());
121 assert_eq!(true, res.unwrap());
122 assert_eq!(b"\xFF\xFE\x73\x00\x0A\x00", &buffer[..]);
124 buffer.clear();
126 let res = reader.read_line(&mut buffer);
127 assert!(res.is_ok());
128 assert_eq!(true, res.unwrap());
129 assert_eq!(b"\x64\x00", &buffer[..]);
131 buffer.clear();
133 let res = reader.read_line(&mut buffer);
134 assert!(res.is_ok());
135 assert_eq!(false, res.unwrap());
136 assert!(buffer.is_empty());