git.iko.soy/bat
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bat/src/inputfile.rs
162 lines 4.4 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 struct OrdinaryFile<'a> {
57 path: &'a OsStr,
58 user_provided_path: Option<&'a OsStr>,
61impl<'a> OrdinaryFile<'a> {
62 pub fn from_path(path: &'a OsStr) -> OrdinaryFile<'a> {
63 OrdinaryFile {
64 path,
65 user_provided_path: None,
66 }
67 }
69 pub fn set_provided_path(&mut self, user_provided_path: &'a OsStr) {
70 self.user_provided_path = Some(user_provided_path);
71 }
73 pub(crate) fn provided_path(&self) -> &'a OsStr {
74 self.user_provided_path.unwrap_or_else(|| self.path)
75 }
78#[derive(Debug, Clone, Copy, PartialEq)]
79pub enum InputFile<'a> {
80 StdIn(Option<&'a OsStr>),
81 Ordinary(OrdinaryFile<'a>),
82 ThemePreviewFile,
85impl<'a> InputFile<'a> {
86 pub(crate) fn get_reader<R: BufRead + 'a>(&self, stdin: R) -> Result<InputFileReader> {
87 match self {
88 InputFile::StdIn(_) => Ok(InputFileReader::new(stdin)),
89 InputFile::Ordinary(ofile) => {
90 let file = File::open(ofile.path)
91 .map_err(|e| format!("'{}': {}", ofile.path.to_string_lossy(), e))?;
93 if file.metadata()?.is_dir() {
94 return Err(
95 format!("'{}' is a directory.", ofile.path.to_string_lossy()).into(),
96 );
97 }
99 Ok(InputFileReader::new(BufReader::new(file)))
100 }
101 InputFile::ThemePreviewFile => Ok(InputFileReader::new(THEME_PREVIEW_FILE)),
102 }
103 }
106#[test]
107fn basic() {
108 let content = b"#!/bin/bash\necho hello";
109 let mut reader = InputFileReader::new(&content[..]);
111 assert_eq!(b"#!/bin/bash\n", &reader.first_line[..]);
113 let mut buffer = vec![];
115 let res = reader.read_line(&mut buffer);
116 assert!(res.is_ok());
117 assert_eq!(true, res.unwrap());
118 assert_eq!(b"#!/bin/bash\n", &buffer[..]);
120 buffer.clear();
122 let res = reader.read_line(&mut buffer);
123 assert!(res.is_ok());
124 assert_eq!(true, res.unwrap());
125 assert_eq!(b"echo hello", &buffer[..]);
127 buffer.clear();
129 let res = reader.read_line(&mut buffer);
130 assert!(res.is_ok());
131 assert_eq!(false, res.unwrap());
132 assert!(buffer.is_empty());
135#[test]
136fn utf16le() {
137 let content = b"\xFF\xFE\x73\x00\x0A\x00\x64\x00";
138 let mut reader = InputFileReader::new(&content[..]);
140 assert_eq!(b"\xFF\xFE\x73\x00\x0A\x00", &reader.first_line[..]);
142 let mut buffer = vec![];
144 let res = reader.read_line(&mut buffer);
145 assert!(res.is_ok());
146 assert_eq!(true, res.unwrap());
147 assert_eq!(b"\xFF\xFE\x73\x00\x0A\x00", &buffer[..]);
149 buffer.clear();
151 let res = reader.read_line(&mut buffer);
152 assert!(res.is_ok());
153 assert_eq!(true, res.unwrap());
154 assert_eq!(b"\x64\x00", &buffer[..]);
156 buffer.clear();
158 let res = reader.read_line(&mut buffer);
159 assert!(res.is_ok());
160 assert_eq!(false, res.unwrap());
161 assert!(buffer.is_empty());