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|
use std::io::{self, Write};
use crate::assets::HighlightingAssets;
use crate::config::Config;
#[cfg(feature = "paging")]
use crate::config::PagingMode;
use crate::error::*;
use crate::input::{Input, InputReader, OpenedInput};
use crate::line_range::{LineRanges, RangeCheckResult};
use crate::output::OutputType;
use crate::printer::{InteractivePrinter, Printer, SimplePrinter};
pub struct Controller<'a> {
config: &'a Config<'a>,
assets: &'a HighlightingAssets,
}
impl<'b> Controller<'b> {
pub fn new<'a>(config: &'a Config, assets: &'a HighlightingAssets) -> Controller<'a> {
Controller { config, assets }
}
pub fn run(&self, inputs: Vec<Input>) -> Result<bool> {
self.run_with_error_handler(inputs, default_error_handler)
}
pub fn run_with_error_handler(
&self,
inputs: Vec<Input>,
handle_error: impl Fn(&Error),
) -> Result<bool> {
let mut output_type;
#[cfg(feature = "paging")]
{
use crate::input::InputKind;
use std::path::Path;
// Do not launch the pager if NONE of the input files exist
let mut paging_mode = self.config.paging_mode;
if self.config.paging_mode != PagingMode::Never {
let call_pager = inputs.iter().any(|ref input| {
if let InputKind::OrdinaryFile(ref path) = input.kind {
return Path::new(path).exists();
} else {
return true;
}
});
if !call_pager {
paging_mode = PagingMode::Never;
}
}
output_type = OutputType::from_mode(paging_mode, self.config.pager)?;
}
#[cfg(not(feature = "paging"))]
{
output_type = OutputType::stdout();
}
let writer = output_type.handle()?;
let mut no_errors: bool = true;
for input in inputs.into_iter() {
match input.open(io::stdin().lock()) {
Err(error) => {
handle_error(&error);
no_errors = false;
}
Ok(mut opened_input) => {
let mut printer: Box<dyn Printer> = if self.config.loop_through {
Box::new(SimplePrinter::new())
} else {
Box::new(InteractivePrinter::new(
&self.config,
&self.assets,
&mut opened_input,
))
};
let result = self.print_file(&mut *printer, writer, &mut opened_input);
if let Err(error) = result {
handle_error(&error);
no_errors = false;
}
}
}
}
Ok(no_errors)
}
fn print_file<'a>(
&self,
printer: &mut dyn Printer,
writer: &mut dyn Write,
input: &mut OpenedInput,
) -> Result<()> {
if !input.reader.first_line.is_empty() || self.config.style_components.header() {
printer.print_header(writer, input)?;
}
if !input.reader.first_line.is_empty() {
self.print_file_ranges(printer, writer, &mut input.reader, &self.config.line_ranges)?;
}
printer.print_footer(writer, input)?;
Ok(())
}
fn print_file_ranges(
&self,
printer: &mut dyn Printer,
writer: &mut dyn Write,
reader: &mut InputReader,
line_ranges: &LineRanges,
) -> Result<()> {
let mut line_buffer = Vec::new();
let mut line_number: usize = 1;
let mut first_range: bool = true;
let mut mid_range: bool = false;
while reader.read_line(&mut line_buffer)? {
match line_ranges.check(line_number) {
RangeCheckResult::BeforeOrBetweenRanges => {
// Call the printer in case we need to call the syntax highlighter
// for this line. However, set `out_of_range` to `true`.
printer.print_line(true, writer, line_number, &line_buffer)?;
mid_range = false;
}
RangeCheckResult::InRange => {
if self.config.style_components.snip() {
if first_range {
first_range = false;
mid_range = true;
} else if !mid_range {
mid_range = true;
printer.print_snip(writer)?;
}
}
printer.print_line(false, writer, line_number, &line_buffer)?;
}
RangeCheckResult::AfterLastRange => {
break;
}
}
line_number += 1;
line_buffer.clear();
}
Ok(())
}
}
|
