git.iko.soy/bat
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bat/src/controller.rs
121 lines 4.0 kB history raw
1use std::io::{self, Write};
2use std::path::Path;
4use crate::app::{Config, PagingMode};
5use crate::assets::HighlightingAssets;
6use crate::errors::*;
7use crate::inputfile::{InputFile, InputFileReader};
8use crate::line_range::{LineRanges, RangeCheckResult};
9use crate::output::OutputType;
10use crate::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) => {
47 handle_error(&error);
48 no_errors = false;
49 }
50 Ok(mut reader) => {
51 let result = if self.config.loop_through {
52 let mut printer = SimplePrinter::new();
53 self.print_file(reader, &mut printer, writer, *input_file)
54 } else {
55 let mut printer = InteractivePrinter::new(
56 &self.config,
57 &self.assets,
58 *input_file,
59 &mut reader,
60 );
61 self.print_file(reader, &mut printer, writer, *input_file)
62 };
64 if let Err(error) = result {
65 handle_error(&error);
66 no_errors = false;
67 }
68 }
69 }
70 }
72 Ok(no_errors)
73 }
75 fn print_file<'a, P: Printer>(
76 &self,
77 reader: InputFileReader,
78 printer: &mut P,
79 writer: &mut Write,
80 input_file: InputFile<'a>,
81 ) -> Result<()> {
82 printer.print_header(writer, input_file)?;
83 if !reader.first_line.is_empty() {
84 self.print_file_ranges(printer, writer, reader, &self.config.line_ranges)?;
85 }
86 printer.print_footer(writer)?;
88 Ok(())
89 }
91 fn print_file_ranges<P: Printer>(
92 &self,
93 printer: &mut P,
94 writer: &mut Write,
95 mut reader: InputFileReader,
96 line_ranges: &LineRanges,
97 ) -> Result<()> {
98 let mut line_buffer = Vec::new();
99 let mut line_number: usize = 1;
101 while reader.read_line(&mut line_buffer)? {
102 match line_ranges.check(line_number) {
103 RangeCheckResult::OutsideRange => {
104 // Call the printer in case we need to call the syntax highlighter
105 // for this line. However, set `out_of_range` to `true`.
106 printer.print_line(true, writer, line_number, &line_buffer)?;
107 }
108 RangeCheckResult::InRange => {
109 printer.print_line(false, writer, line_number, &line_buffer)?;
110 }
111 RangeCheckResult::AfterLastRange => {
112 break;
113 }
114 }
116 line_number += 1;
117 line_buffer.clear();
118 }
119 Ok(())
120 }