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// Based on code from https://github.com/sharkdp/bat a1b9334a44a2c652f52dddaa83dbacba57372468
// See src/bat/LICENSE
use std::fs::File;
use std::io::{self, BufReader, Write};
use std::path::PathBuf;
use ansi_term::Colour::Green;
use ansi_term::Style;
use syntect::dumps::{from_binary, from_reader};
use syntect::highlighting::ThemeSet;
use syntect::parsing::SyntaxSet;
use crate::bat::dirs::PROJECT_DIRS;
use crate::errors::*;
pub struct HighlightingAssets {
pub syntax_set: SyntaxSet,
pub theme_set: ThemeSet,
}
impl HighlightingAssets {
pub fn new() -> Self {
Self::from_cache().unwrap_or_else(|_| Self::from_binary())
}
fn get_integrated_syntaxset() -> SyntaxSet {
from_binary(include_bytes!("../../etc/assets/syntaxes.bin"))
}
fn get_integrated_themeset() -> ThemeSet {
from_binary(include_bytes!("../../etc/assets/themes.bin"))
}
fn from_cache() -> Result<Self> {
let theme_set_path = theme_set_path();
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,
})
}
fn from_binary() -> Self {
let syntax_set = Self::get_integrated_syntaxset();
let theme_set = Self::get_integrated_themeset();
HighlightingAssets {
syntax_set,
theme_set,
}
}
}
fn theme_set_path() -> PathBuf {
PROJECT_DIRS.cache_dir().join("themes.bin")
}
fn syntax_set_path() -> PathBuf {
PROJECT_DIRS.cache_dir().join("syntaxes.bin")
}
pub fn list_languages() -> std::io::Result<()> {
let assets = HighlightingAssets::new();
let mut languages = assets
.syntax_set
.syntaxes()
.iter()
.filter(|syntax| !syntax.hidden && !syntax.file_extensions.is_empty())
.collect::<Vec<_>>();
languages.sort_by_key(|lang| lang.name.to_uppercase());
let loop_through = false;
let colored_output = true;
let stdout = io::stdout();
let mut stdout = stdout.lock();
if loop_through {
for lang in languages {
writeln!(stdout, "{}:{}", lang.name, lang.file_extensions.join(","))?;
}
} else {
let longest = languages
.iter()
.map(|syntax| syntax.name.len())
.max()
.unwrap_or(32); // Fallback width if they have no language definitions.
let comma_separator = ", ";
let separator = " ";
// Line-wrapping for the possible file extension overflow.
let desired_width = 100;
let style = if colored_output {
Green.normal()
} else {
Style::default()
};
for lang in languages {
write!(stdout, "{:width$}{}", lang.name, separator, width = longest)?;
// Number of characters on this line so far, wrap before `desired_width`
let mut num_chars = 0;
let mut extension = lang.file_extensions.iter().peekable();
while let Some(word) = extension.next() {
// If we can't fit this word in, then create a line break and align it in.
let new_chars = word.len() + comma_separator.len();
if num_chars + new_chars >= desired_width {
num_chars = 0;
write!(stdout, "\n{:width$}{}", "", separator, width = longest)?;
}
num_chars += new_chars;
write!(stdout, "{}", style.paint(&word[..]))?;
if extension.peek().is_some() {
write!(stdout, "{}", comma_separator)?;
}
}
writeln!(stdout)?;
}
}
Ok(())
}
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