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use std::io;
use std::path::Path;
use grep::printer::{ColorSpecs, PrinterPath};
use termcolor::WriteColor;
/// A configuration for describing how paths should be written.
#[derive(Clone, Debug)]
struct Config {
colors: ColorSpecs,
separator: Option<u8>,
terminator: u8,
}
impl Default for Config {
fn default() -> Config {
Config {
colors: ColorSpecs::default(),
separator: None,
terminator: b'\n',
}
}
}
/// A builder for constructing things to search over.
#[derive(Clone, Debug)]
pub struct PathPrinterBuilder {
config: Config,
}
impl PathPrinterBuilder {
/// Return a new subject builder with a default configuration.
pub fn new() -> PathPrinterBuilder {
PathPrinterBuilder { config: Config::default() }
}
/// Create a new path printer with the current configuration that writes
/// paths to the given writer.
pub fn build<W: WriteColor>(&self, wtr: W) -> PathPrinter<W> {
PathPrinter {
config: self.config.clone(),
wtr: wtr,
}
}
/// Set the color specification for this printer.
///
/// Currently, only the `path` component of the given specification is
/// used.
pub fn color_specs(
&mut self,
specs: ColorSpecs,
) -> &mut PathPrinterBuilder {
self.config.colors = specs;
self
}
/// A path separator.
///
/// When provided, the path's default separator will be replaced with
/// the given separator.
///
/// This is not set by default, and the system's default path separator
/// will be used.
pub fn separator(&mut self, sep: Option<u8>) -> &mut PathPrinterBuilder {
self.config.separator = sep;
self
}
/// A path terminator.
///
/// When printing a path, it will be by terminated by the given byte.
///
/// This is set to `\n` by default.
pub fn terminator(&mut self, terminator: u8) -> &mut PathPrinterBuilder {
self.config.terminator = terminator;
self
}
}
/// A printer for emitting paths to a writer, with optional color support.
#[derive(Debug)]
pub struct PathPrinter<W> {
config: Config,
wtr: W,
}
impl<W: WriteColor> PathPrinter<W> {
/// Write the given path to the underlying writer.
pub fn write_path(&mut self, path: &Path) -> io::Result<()> {
let ppath = PrinterPath::with_separator(path, self.config.separator);
if !self.wtr.supports_color() {
self.wtr.write_all(ppath.as_bytes())?;
} else {
self.wtr.set_color(self.config.colors.path())?;
self.wtr.write_all(ppath.as_bytes())?;
self.wtr.reset()?;
}
self.wtr.write_all(&[self.config.terminator])
}
}
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