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use std::path::Path;
use regex::bytes::Regex;
use term::{Attr, Terminal};
use term::color;
use pathutil::strip_prefix;
use types::FileTypeDef;
/// Printer encapsulates all output logic for searching.
///
/// Note that we currently ignore all write errors. It's probably worthwhile
/// to fix this, but printers are only ever used for writes to stdout or
/// writes to memory, neither of which commonly fail.
pub struct Printer<W> {
/// The underlying writer.
wtr: W,
/// Whether anything has been printed to wtr yet.
has_printed: bool,
/// Whether to show column numbers for the first match or not.
column: bool,
/// The string to use to separate non-contiguous runs of context lines.
context_separator: Vec<u8>,
/// The end-of-line terminator used by the printer. In general, eols are
/// printed via the match directly, but occasionally we need to insert them
/// ourselves (for example, to print a context separator).
eol: u8,
/// Whether to show file name as a heading or not.
///
/// N.B. If with_filename is false, then this setting has no effect.
heading: bool,
/// Whether to show every match on its own line.
line_per_match: bool,
/// Whether to suppress all output.
quiet: bool,
/// A string to use as a replacement of each match in a matching line.
replace: Option<Vec<u8>>,
/// Whether to prefix each match with the corresponding file name.
with_filename: bool,
}
impl<W: Terminal + Send> Printer<W> {
/// Create a new printer that writes to wtr.
pub fn new(wtr: W) -> Printer<W> {
Printer {
wtr: wtr,
has_printed: false,
column: false,
context_separator: "--".to_string().into_bytes(),
eol: b'\n',
heading: false,
line_per_match: false,
quiet: false,
replace: None,
with_filename: false,
}
}
/// When set, column numbers will be printed for the first match on each
/// line.
pub fn column(mut self, yes: bool) -> Printer<W> {
self.column = yes;
self
}
/// Set the context separator. The default is `--`.
pub fn context_separator(mut self, sep: Vec<u8>) -> Printer<W> {
self.context_separator = sep;
self
}
/// Set the end-of-line terminator. The default is `\n`.
pub fn eol(mut self, eol: u8) -> Printer<W> {
self.eol = eol;
self
}
/// Whether to show file name as a heading or not.
///
/// N.B. If with_filename is false, then this setting has no effect.
pub fn heading(mut self, yes: bool) -> Printer<W> {
self.heading = yes;
self
}
/// Whether to show every match on its own line.
pub fn line_per_match(mut self, yes: bool) -> Printer<W> {
self.line_per_match = yes;
self
}
/// When set, all output is suppressed.
pub fn quiet(mut self, yes: bool) -> Printer<W> {
self.quiet = yes;
self
}
/// Replace every match in each matching line with the replacement string
/// given.
///
/// The replacement string syntax is documented here:
/// https://doc.rust-lang.org/regex/regex/bytes/struct.Captures.html#method.expand
pub fn replace(mut self, replacement: Vec<u8>) -> Printer<W> {
self.replace = Some(replacement);
self
}
/// When set, each match is prefixed with the file name that it came from.
pub fn with_filename(mut self, yes: bool) -> Printer<W> {
self.with_filename = yes;
self
}
/// Returns true if and only if something has been printed.
pub fn has_printed(&self) -> bool {
self.has_printed
}
/// Flushes the underlying writer and returns it.
pub fn into_inner(mut self) -> W {
let _ = self.wtr.flush();
self.wtr
}
/// Prints a type definition.
pub fn type_def(&mut self, def: &FileTypeDef) {
self.write(def.name().as_bytes());
self.write(b": ");
let mut first = true;
for pat in def.patterns() {
if !first {
self.write(b", ");
}
self.write(pat.as_bytes());
first = false;
}
self.write_eol();
}
/// Prints the given path.
pub fn path<P: AsRef<Path>>(&mut self, path: P) {
let path = strip_prefix("./", path.as_ref()).unwrap_or(path.as_ref());
self.write(path.to_string_lossy().as_bytes());
self.write_eol();
}
/// Prints the given path and a count of the number of matches found.
pub fn path_count<P: AsRef<Path>>(&mut self, path: P, count: u64) {
if self.with_filename {
self.write(path.as_ref().to_string_lossy().as_bytes());
self.write(b":");
}
self.write(count.to_string().as_bytes());
self.write_eol();
}
/// Prints the context separator.
pub fn context_separate(&mut self) {
// N.B. We can't use `write` here because of borrowing restrictions.
if self.quiet {
return;
}
if self.context_separator.is_empty() {
return;
}
self.has_printed = true;
let _ = self.wtr.write_all(&self.context_separator);
let _ = self.wtr.write_all(&[self.eol]);
}
pub fn matched<P: AsRef<Path>>(
&mut self,
re: &Regex,
path: P,
buf: &[u8],
start: usize,
end: usize,
line_number: Option<u64>,
) {
if !self.line_per_match {
let column =
if self.column {
Some(re.find(&buf[start..end])
.map(|(s, _)| s + 1).unwrap_or(0) as u64)
} else {
None
};
return self.write_match(
re, path, buf, start, end, line_number, column);
}
for (s, _) in re.find_iter(&buf[start..end]) {
let column = if self.column { Some(s as u64) } else { None };
self.write_match(
re, path.as_ref(), buf, start, end, line_number, column);
}
}
fn write_match<P: AsRef<Path>>(
&mut self,
re: &Regex,
path: P,
buf: &[u8],
start: usize,
end: usize,
line_number: Option<u64>,
column: Option<u64>,
) {
if self.heading && self.with_filename && !self.has_printed {
self.write_heading(path.as_ref());
} else if !self.heading && self.with_filename {
self.write(path.as_ref().to_string_lossy().as_bytes());
self.write(b":");
}
if let Some(line_number) = line_number {
self.line_number(line_number, b':');
}
if let Some(c) = column {
self.write((c + 1).to_string().as_bytes());
self.write(b":");
}
if self.replace.is_some() {
let line = re.replace_all(
&buf[start..end], &**self.replace.as_ref().unwrap());
self.write(&line);
} else {
self.write_matched_line(re, &buf[start..end]);
}
if buf[start..end].last() != Some(&self.eol) {
self.write_eol();
}
}
fn write_matched_line(&mut self, re: &Regex, buf: &[u8]) {
if !self.wtr.supports_color() {
self.write(buf);
return;
}
let mut last_written = 0;
for (s, e) in re.find_iter(buf) {
self.write(&buf[last_written..s]);
let _ = self.wtr.fg(color::BRIGHT_RED);
let _ = self.wtr.attr(Attr::Bold);
self.write(&buf[s..e]);
let _ = self.wtr.reset();
last_written = e;
}
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