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// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
//! This module provides file formating utilities using
//! [`deno_lint`](https://github.com/denoland/deno_lint).
//!
//! At the moment it is only consumed using CLI but in
//! the future it can be easily extended to provide
//! the same functions as ops available in JS runtime.
use crate::colors;
use crate::file_fetcher::map_file_extension;
use crate::fmt::collect_files;
use crate::fmt_errors;
use crate::swc_util;
use deno_core::ErrBox;
use deno_lint::diagnostic::LintDiagnostic;
use deno_lint::linter::Linter;
use deno_lint::rules;
use std::fs;
use std::path::PathBuf;
pub fn lint_files(args: Vec<String>) -> Result<(), ErrBox> {
let target_files = collect_files(args)?;
let mut error_counts = 0;
for file_path in target_files {
let file_diagnostics = lint_file(file_path)?;
error_counts += file_diagnostics.len();
for d in file_diagnostics.iter() {
let fmt_diagnostic = format_diagnostic(d);
eprintln!("{}\n", fmt_diagnostic);
}
}
if error_counts > 0 {
eprintln!("Found {} problems", error_counts);
std::process::exit(1);
}
Ok(())
}
fn lint_file(file_path: PathBuf) -> Result<Vec<LintDiagnostic>, ErrBox> {
let file_name = file_path.to_string_lossy().to_string();
let source_code = fs::read_to_string(&file_path)?;
let media_type = map_file_extension(&file_path);
let syntax = swc_util::get_syntax_for_media_type(media_type);
let mut linter = Linter::default();
let lint_rules = rules::get_recommended_rules();
let file_diagnostics =
linter.lint(file_name, source_code, syntax, lint_rules)?;
Ok(file_diagnostics)
}
fn format_diagnostic(d: &LintDiagnostic) -> String {
let pretty_message = format!(
"({}) {}",
colors::gray(d.code.to_string()),
d.message.clone()
);
fmt_errors::format_stack(
true,
pretty_message,
Some(d.line_src.clone()),
Some(d.location.col as i64),
Some((d.location.col + d.snippet_length) as i64),
&[fmt_errors::format_location(
d.location.filename.clone(),
d.location.line as i64,
d.location.col as i64,
)],
0,
)
}
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