git.iko.soy/bat
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bat/src/controller.rs
120 lines 4.0 kB history raw
1use std::io::{self, Write};
2use std::path::Path;
4use app::{Config, PagingMode};
5use assets::HighlightingAssets;
6use errors::*;
7use inputfile::{InputFile, InputFileReader};
8use line_range::{LineRanges, RangeCheckResult};
9use output::OutputType;
10use printer::{InteractivePrinter, Printer, SimplePrinter};
12pub struct Controller<'a> {
13 config: &'a Config<'a>,
14 assets: &'a HighlightingAssets,
17impl<'b> Controller<'b> {
18 pub fn new<'a>(config: &'a Config, assets: &'a HighlightingAssets) -> Controller<'a> {
19 Controller { config, assets }
20 }
22 pub fn run(&self) -> Result<bool> {
23 // Do not launch the pager if NONE of the input files exist
24 let mut paging_mode = self.config.paging_mode;
25 if self.config.paging_mode != PagingMode::Never {
26 let call_pager = self.config.files.iter().any(|file| {
27 if let InputFile::Ordinary(path) = file {
28 return Path::new(path).exists();
29 } else {
30 return true;
31 }
32 });
33 if !call_pager {
34 paging_mode = PagingMode::Never;
35 }
36 }
38 let mut output_type = OutputType::from_mode(paging_mode, self.config.pager)?;
39 let writer = output_type.handle()?;
40 let mut no_errors: bool = true;
42 let stdin = io::stdin();
44 for input_file in &self.config.files {
45 match input_file.get_reader(&stdin) {
46 Err(Error(ErrorKind::ImmediateEOF, _)) => (),
47 Err(error) => {
48 handle_error(&error);
49 no_errors = false;
50 }
51 Ok(mut reader) => {
52 let result = if self.config.loop_through {
53 let mut printer = SimplePrinter::new();
54 self.print_file(reader, &mut printer, writer, *input_file)
55 } else {
56 let mut printer = InteractivePrinter::new(
57 &self.config,
58 &self.assets,
59 *input_file,
60 &mut reader,
61 );
62 self.print_file(reader, &mut printer, writer, *input_file)
63 };
65 if let Err(error) = result {
66 handle_error(&error);
67 no_errors = false;
68 }
69 }
70 }
71 }
73 Ok(no_errors)
74 }
76 fn print_file<'a, P: Printer>(
77 &self,
78 reader: InputFileReader,
79 printer: &mut P,
80 writer: &mut Write,
81 input_file: InputFile<'a>,
82 ) -> Result<()> {
83 printer.print_header(writer, input_file)?;
84 self.print_file_ranges(printer, writer, reader, &self.config.line_ranges)?;
85 printer.print_footer(writer)?;
87 Ok(())
88 }
90 fn print_file_ranges<'a, P: Printer>(
91 &self,
92 printer: &mut P,
93 writer: &mut Write,
94 mut reader: InputFileReader,
95 line_ranges: &LineRanges,
96 ) -> Result<()> {
97 let mut line_buffer = Vec::new();
98 let mut line_number: usize = 1;
100 while reader.read_line(&mut line_buffer)? {
101 match line_ranges.check(line_number) {
102 RangeCheckResult::OutsideRange => {
103 // Call the printer in case we need to call the syntax highlighter
104 // for this line. However, set `out_of_range` to `true`.
105 printer.print_line(true, writer, line_number, &line_buffer)?;
106 }
107 RangeCheckResult::InRange => {
108 printer.print_line(false, writer, line_number, &line_buffer)?;
109 }
110 RangeCheckResult::AfterLastRange => {
111 break;
112 }
113 }
115 line_number += 1;
116 line_buffer.clear();
117 }
118 Ok(())
119 }