git.iko.soy/bat
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bat/src/controller.rs
143 lines 4.8 kB history raw
1use std::io::{self, Write};
2use std::path::Path;
4use crate::assets::HighlightingAssets;
5use crate::config::{Config, PagingMode};
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 self.run_with_error_handler(default_error_handler)
24 }
26 pub fn run_with_error_handler(&self, handle_error: impl Fn(&Error)) -> Result<bool> {
27 // Do not launch the pager if NONE of the input files exist
28 let mut paging_mode = self.config.paging_mode;
29 if self.config.paging_mode != PagingMode::Never {
30 let call_pager = self.config.files.iter().any(|file| {
31 if let InputFile::Ordinary(path) = file {
32 return Path::new(path).exists();
33 } else {
34 return true;
35 }
36 });
37 if !call_pager {
38 paging_mode = PagingMode::Never;
39 }
40 }
42 let mut output_type = OutputType::from_mode(paging_mode, self.config.pager)?;
43 let writer = output_type.handle()?;
44 let mut no_errors: bool = true;
46 let stdin = io::stdin();
48 for input_file in &self.config.files {
49 match input_file.get_reader(&stdin) {
50 Err(error) => {
51 handle_error(&error);
52 no_errors = false;
53 }
54 Ok(mut reader) => {
55 let result = if self.config.loop_through {
56 let mut printer = SimplePrinter::new();
57 self.print_file(reader, &mut printer, writer, *input_file)
58 } else {
59 let mut printer = InteractivePrinter::new(
60 &self.config,
61 &self.assets,
62 *input_file,
63 &mut reader,
64 );
65 self.print_file(reader, &mut printer, writer, *input_file)
66 };
68 if let Err(error) = result {
69 handle_error(&error);
70 no_errors = false;
71 }
72 }
73 }
74 }
76 Ok(no_errors)
77 }
79 fn print_file<'a, P: Printer>(
80 &self,
81 reader: InputFileReader,
82 printer: &mut P,
83 writer: &mut dyn Write,
84 input_file: InputFile<'a>,
85 ) -> Result<()> {
86 if !reader.first_line.is_empty() || self.config.style_components.header() {
87 printer.print_header(writer, input_file)?;
88 }
90 if !reader.first_line.is_empty() {
91 self.print_file_ranges(printer, writer, reader, &self.config.line_ranges)?;
92 }
93 printer.print_footer(writer)?;
95 Ok(())
96 }
98 fn print_file_ranges<P: Printer>(
99 &self,
100 printer: &mut P,
101 writer: &mut dyn Write,
102 mut reader: InputFileReader,
103 line_ranges: &LineRanges,
104 ) -> Result<()> {
105 let mut line_buffer = Vec::new();
106 let mut line_number: usize = 1;
108 let mut first_range: bool = true;
109 let mut mid_range: bool = false;
111 while reader.read_line(&mut line_buffer)? {
112 match line_ranges.check(line_number) {
113 RangeCheckResult::BeforeOrBetweenRanges => {
114 // Call the printer in case we need to call the syntax highlighter
115 // for this line. However, set `out_of_range` to `true`.
116 printer.print_line(true, writer, line_number, &line_buffer)?;
117 mid_range = false;
118 }
120 RangeCheckResult::InRange => {
121 if self.config.style_components.snip() {
122 if first_range {
123 first_range = false;
124 mid_range = true;
125 } else if !mid_range {
126 mid_range = true;
127 printer.print_snip(writer)?;
128 }
129 }
131 printer.print_line(false, writer, line_number, &line_buffer)?;
132 }
133 RangeCheckResult::AfterLastRange => {
134 break;
135 }
136 }
138 line_number += 1;
139 line_buffer.clear();
140 }
141 Ok(())
142 }