use std::collections::BTreeMap;
use std::ffi::OsStr;
use std::fs::{self, File};
use std::io::BufReader;
use std::path::Path;
use syntect::dumps::{dump_to_file, from_binary, from_reader};
use syntect::highlighting::{Theme, ThemeSet};
use syntect::parsing::{SyntaxReference, SyntaxSet, SyntaxSetBuilder};
use path_abs::PathAbs;
use crate::assets_metadata::AssetsMetadata;
use crate::error::*;
use crate::input::{InputReader, OpenedInput, OpenedInputKind};
use crate::syntax_mapping::{MappingTarget, SyntaxMapping};
#[derive(Debug)]
pub struct HighlightingAssets {
pub(crate) syntax_set: SyntaxSet,
pub(crate) theme_set: ThemeSet,
fallback_theme: Option<&'static str>,
}
impl HighlightingAssets {
pub fn default_theme() -> &'static str {
"Monokai Extended"
}
pub fn from_files(source_dir: &Path, include_integrated_assets: bool) -> Result<Self> {
let mut theme_set = if include_integrated_assets {
Self::get_integrated_themeset()
} else {
ThemeSet {
themes: BTreeMap::new(),
}
};
let theme_dir = source_dir.join("themes");
let res = theme_set.add_from_folder(&theme_dir);
if res.is_err() {
println!(
"No themes were found in '{}', using the default set",
theme_dir.to_string_lossy()
);
}
let mut syntax_set_builder = if !include_integrated_assets {
let mut builder = SyntaxSetBuilder::new();
builder.add_plain_text_syntax();
builder
} else {
Self::get_integrated_syntaxset().into_builder()
};
let syntax_dir = source_dir.join("syntaxes");
if syntax_dir.exists() {
syntax_set_builder.add_from_folder(syntax_dir, true)?;
} else {
println!(
"No syntaxes were found in '{}', using the default set.",
syntax_dir.to_string_lossy()
);
}
Ok(HighlightingAssets {
syntax_set: syntax_set_builder.build(),
theme_set,
fallback_theme: None,
})
}
pub fn from_cache(cache_path: &Path) -> Result<Self> {
let syntax_set_path = cache_path.join("syntaxes.bin");
let theme_set_path = cache_path.join("themes.bin");
let syntax_set_file = File::open(&syntax_set_path).chain_err(|| {
format!(
"Could not load cached syntax set '{}'",
syntax_set_path.to_string_lossy()
)
})?;
let syntax_set: SyntaxSet = from_reader(BufReader::new(syntax_set_file))
.chain_err(|| "Could not parse cached syntax set")?;
let theme_set_file = File::open(&theme_set_path).chain_err(|| {
format!(
"Could not load cached theme set '{}'",
theme_set_path.to_string_lossy()
)
})?;
let theme_set: ThemeSet = from_reader(BufReader::new(theme_set_file))
.chain_err(|| "Could not parse cached theme set")?;
Ok(HighlightingAssets {
syntax_set,
theme_set,
fallback_theme: None,
})
}
fn get_integrated_syntaxset() -> SyntaxSet {
from_binary(include_bytes!("../assets/syntaxes.bin"))
}
fn get_integrated_themeset() -> ThemeSet {
from_binary(include_bytes!("../assets/themes.bin"))
}
pub fn from_binary() -> Self {
let syntax_set = Self::get_integrated_syntaxset();
let theme_set = Self::get_integrated_themeset();
HighlightingAssets {
syntax_set,
theme_set,
fallback_theme: None,
}
}
pub fn save_to_cache(&self, target_dir: &Path, current_version: &str) -> Result<()> {
let _ = fs::create_dir_all(target_dir);
let theme_set_path = target_dir.join("themes.bin");
let syntax_set_path = target_dir.join("syntaxes.bin");
print!(
"Writing theme set to {} ... ",
theme_set_path.to_string_lossy()
);
dump_to_file(&self.theme_set, &theme_set_path).chain_err(|| {
format!(
"Could not save theme set to {}",
theme_set_path.to_string_lossy()
)
})?;
println!("okay");
print!(
"Writing syntax set to {} ... ",
syntax_set_path.to_string_lossy()
);
dump_to_file(&self.syntax_set, &syntax_set_path).chain_err(|| {
format!(
"Could not save syntax set to {}",
syntax_set_path.to_string_lossy()
)
})?;
println!("okay");
print!(
"Writing metadata to folder {} ... ",
target_dir.to_string_lossy()
);
AssetsMetadata::new(current_version).save_to_folder(target_dir)?;
println!("okay");
Ok(())
}
pub fn set_fallback_theme(&mut self, theme: &'static str) {
self.fallback_theme = Some(theme);
}
pub fn syntaxes(&self) -> &[SyntaxReference] {
self.syntax_set.syntaxes()
}
pub fn themes(&self) -> impl Iterator<Item = &str> {
self.theme_set.themes.keys().map(|s| s.as_ref())
}
pub fn syntax_for_file_name(
&self,
file_name: impl AsRef<Path>,
mapping: &SyntaxMapping,
) -> Option<&SyntaxReference> {
let file_name = file_name.as_ref();
match mapping.get_syntax_for(file_name) {
Some(MappingTarget::MapToUnknown) => None,
Some(MappingTarget::MapTo(syntax_name)) => {
self.syntax_set.find_syntax_by_name(syntax_name)
}
None => self.get_extension_syntax(file_name.as_os_str()),
}
}
pub(crate) fn get_theme(&self, theme: &str) -> &Theme {
match self.theme_set.themes.get(theme) {
Some(theme) => theme,
None => {
if theme != "" {
use ansi_term::Colour::Yellow;
eprintln!(
"{}: Unknown theme '{}', using default.",
Yellow.paint("[bat warning]"),
theme
);
}
&self.theme_set.themes[self.fallback_theme.unwrap_or_else(|| Self::default_theme())]
}
}
}
pub(crate) fn get_syntax(
&self,
language: Option<&str>,
input: &mut OpenedInput,
mapping: &SyntaxMapping,
) -> Result<&SyntaxReference> {
if let Some(language) = language {
self.syntax_set
.find_syntax_by_token(language)
.ok_or_else(|| ErrorKind::UnknownSyntax(language.to_owned()).into())
} else {
let line_syntax = self.get_first_line_syntax(&mut input.reader);
let path_str =
input
.metadata
.user_provided_name
.as_ref()
.or_else(|| match input.kind {
OpenedInputKind::OrdinaryFile(ref path) => Some(path),
_ => None,
});
if let Some(path_str) = path_str {
let path = Path::new(path_str);
let absolute_path = PathAbs::new(path)
.ok()
.map(|p| p.as_path().to_path_buf())
.unwrap_or_else(|| path.to_owned());
match mapping.get_syntax_for(absolute_path) {
Some(MappingTarget::MapToUnknown) => line_syntax.ok_or_else(|| {
ErrorKind::UndetectedSyntax(path.to_string_lossy().into()).into()
}),
Some(MappingTarget::MapTo(syntax_name)) => self
.syntax_set
.find_syntax_by_name(syntax_name)
.ok_or_else(|| ErrorKind::UnknownSyntax(syntax_name.to_owned()).into()),
None => {
let file_name = path.file_name().unwrap_or_default();
self.get_extension_syntax(file_name)
.or(line_syntax)
.ok_or_else(|| {
ErrorKind::UndetectedSyntax(path.to_string_lossy().into()).into()
})
}
}
} else {
line_syntax.ok_or_else(|| ErrorKind::UndetectedSyntax("[unknown]".into()).into())
}
}
}
fn get_extension_syntax(&self, file_name: &OsStr) -> Option<&SyntaxReference> {
self.syntax_set
.find_syntax_by_extension(file_name.to_str().unwrap_or_default())
.or_else(|| {
self.syntax_set.find_syntax_by_extension(
Path::new(file_name)
.extension()
.and_then(|x| x.to_str())
.unwrap_or_default(),
)
})
}
fn get_first_line_syntax(&self, reader: &mut InputReader) -> Option<&SyntaxReference> {
String::from_utf8(reader.first_line.clone())
.ok()
.and_then(|l| self.syntax_set.find_syntax_by_first_line(&l))
}
}
#[cfg(test)]
mod tests {
use super::*;
use std::ffi::OsStr;
use std::fs::File;
use std::io::Write;
use tempdir::TempDir;
use crate::input::Input;
struct SyntaxDetectionTest<'a> {
assets: HighlightingAssets,
pub syntax_mapping: SyntaxMapping<'a>,
pub temp_dir: TempDir,
}
impl<'a> SyntaxDetectionTest<'a> {
fn new() -> Self {
SyntaxDetectionTest {
assets: HighlightingAssets::from_binary(),
syntax_mapping: SyntaxMapping::builtin(),
temp_dir: TempDir::new("bat_syntax_detection_tests")
.expect("creation of temporary directory"),
}
}
fn syntax_for_real_file_with_content_os(
&self,
file_name: &OsStr,
first_line: &str,
) -> String {
let file_path = self.temp_dir.path().join(file_name);
{
let mut temp_file = File::create(&file_path).unwrap();
writeln!(temp_file, "{}", first_line).unwrap();
}
let input = Input::ordinary_file(file_path.as_os_str());
let dummy_stdin: &[u8] = &[];
let mut opened_input = input.open(dummy_stdin).unwrap();
self.assets
.get_syntax(None, &mut opened_input, &self.syntax_mapping)
.unwrap_or_else(|_| self.assets.syntax_set.find_syntax_plain_text())
.name
.clone()
}
fn syntax_for_file_with_content_os(&self, file_name: &OsStr, first_line: &str) -> String {
let file_path = self.temp_dir.path().join(file_name);
let input = Input::from_reader(Box::new(BufReader::new(first_line.as_bytes())))
.with_name(Some(file_path.as_os_str()));
let dummy_stdin: &[u8] = &[];
let mut opened_input = input.open(dummy_stdin).unwrap();
self.assets
.get_syntax(None, &mut opened_input, &self.syntax_mapping)
.unwrap_or_else(|_| self.assets.syntax_set.find_syntax_plain_text())
.name
.clone()
}
#[cfg(unix)]
fn syntax_for_file_os(&self, file_name: &OsStr) -> String {
self.syntax_for_file_with_content_os(file_name, "")
}
fn syntax_for_file_with_content(&self, file_name: &str, first_line: &str) -> String {
self.syntax_for_file_with_content_os(OsStr::new(file_name), first_line)
}
fn syntax_for_file(&self, file_name: &str) -> String {
self.syntax_for_file_with_content(file_name, "")
}
fn syntax_for_stdin_with_content(&self, file_name: &str, content: &[u8]) -> String {
let input = Input::stdin().with_name(Some(OsStr::new(file_name)));
let mut opened_input = input.open(content).unwrap();
self.assets
.get_syntax(None, &mut opened_input, &self.syntax_mapping)
.unwrap_or_else(|_| self.assets.syntax_set.find_syntax_plain_text())
.name
.clone()
}
fn syntax_is_same_for_inputkinds(&self, file_name: &str, content: &str) -> bool {
let as_file = self.syntax_for_real_file_with_content_os(file_name.as_ref(), content);
let as_reader = self.syntax_for_file_with_content_os(file_name.as_ref(), content);
let consistent = as_file == as_reader;
if !consistent {
eprintln!(
"Inconsistent syntax detection:\nFor File: {}\nFor Reader: {}",
as_file, as_reader
)
}
consistent
}
}
#[test]
fn syntax_detection_basic() {
let test = SyntaxDetectionTest::new();
assert_eq!(test.syntax_for_file("test.rs"), "Rust");
assert_eq!(test.syntax_for_file("test.cpp"), "C++");
assert_eq!(test.syntax_for_file("test.build"), "NAnt Build File");
assert_eq!(
test.syntax_for_file("PKGBUILD"),
"Bourne Again Shell (bash)"
);
assert_eq!(test.syntax_for_file(".bashrc"), "Bourne Again Shell (bash)");
assert_eq!(test.syntax_for_file("Makefile"), "Makefile");
}
#[cfg(unix)]
#[test]
fn syntax_detection_invalid_utf8() {
use std::os::unix::ffi::OsStrExt;
let test = SyntaxDetectionTest::new();
assert_eq!(
test.syntax_for_file_os(OsStr::from_bytes(b"invalid_\xFEutf8_filename.rs")),
"Rust"
);
}
#[test]
fn syntax_detection_same_for_inputkinds() {
let mut test = SyntaxDetectionTest::new();
test.syntax_mapping
.insert("*.myext", MappingTarget::MapTo("C"))
.ok();
test.syntax_mapping
.insert("MY_FILE", MappingTarget::MapTo("Markdown"))
.ok();
assert!(test.syntax_is_same_for_inputkinds("Test.md", ""));
assert!(test.syntax_is_same_for_inputkinds("Test.txt", "#!/bin/bash"));
assert!(test.syntax_is_same_for_inputkinds(".bashrc", ""));
assert!(test.syntax_is_same_for_inputkinds("test.h", ""));
assert!(test.syntax_is_same_for_inputkinds("test.js", "#!/bin/bash"));
assert!(test.syntax_is_same_for_inputkinds("test.myext", ""));
assert!(test.syntax_is_same_for_inputkinds("MY_FILE", ""));
assert!(test.syntax_is_same_for_inputkinds("MY_FILE", "<?php"));
}
#[test]
fn syntax_detection_well_defined_mapping_for_duplicate_extensions() {
let test = SyntaxDetectionTest::new();
assert_eq!(test.syntax_for_file("test.h"), "C++");
assert_eq!(test.syntax_for_file("test.sass"), "Sass");
assert_eq!(test.syntax_for_file("test.js"), "JavaScript (Babel)");
assert_eq!(test.syntax_for_file("test.fs"), "F#");
}
#[test]
fn syntax_detection_first_line() {
let test = SyntaxDetectionTest::new();
assert_eq!(
test.syntax_for_file_with_content("my_script", "#!/bin/bash"),
"Bourne Again Shell (bash)"
);
assert_eq!(
test.syntax_for_file_with_content("build", "#!/bin/bash"),
"Bourne Again Shell (bash)"
);
assert_eq!(
test.syntax_for_file_with_content("my_script", "<?php"),
"PHP"
);
}
#[test]
fn syntax_detection_with_custom_mapping() {
let mut test = SyntaxDetectionTest::new();
assert_eq!(test.syntax_for_file("test.h"), "C++");
test.syntax_mapping
.insert("*.h", MappingTarget::MapTo("C"))
.ok();
assert_eq!(test.syntax_for_file("test.h"), "C");
}
#[test]
fn syntax_detection_is_case_sensitive() {
let mut test = SyntaxDetectionTest::new();
assert_ne!(test.syntax_for_file("README.MD"), "Markdown");
test.syntax_mapping
.insert("*.MD", MappingTarget::MapTo("Markdown"))
.ok();
assert_eq!(test.syntax_for_file("README.MD"), "Markdown");
}
#[test]
fn syntax_detection_stdin_filename() {
let test = SyntaxDetectionTest::new();
assert_eq!(test.syntax_for_stdin_with_content("test.cpp", b"a"), "C++");
assert_eq!(
test.syntax_for_stdin_with_content("my_script", b"#!/bin/bash"),
"Bourne Again Shell (bash)"
);
}
#[cfg(unix)]
#[test]
fn syntax_detection_for_symlinked_file() {
use std::os::unix::fs::symlink;
let test = SyntaxDetectionTest::new();
let file_path = test.temp_dir.path().join("my_ssh_config_filename");
{
File::create(&file_path).unwrap();
}
let file_path_symlink = test.temp_dir.path().join(".ssh").join("config");
std::fs::create_dir(test.temp_dir.path().join(".ssh"))
.expect("creation of directory succeeds");
symlink(&file_path, &file_path_symlink).expect("creation of symbolic link succeeds");
let input = Input::ordinary_file(file_path_symlink.as_os_str());
let dummy_stdin: &[u8] = &[];
let mut opened_input = input.open(dummy_stdin).unwrap();
assert_eq!(
test.assets
.get_syntax(None, &mut opened_input, &test.syntax_mapping)
.unwrap_or_else(|_| test.assets.syntax_set.find_syntax_plain_text())
.name,
"SSH Config"
);
}
}