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