feat(lint): use default globs, upgrade to v0.1.9 (#6222)

This commit:
* added default file globs so "deno lint" can be run
without arguments (just like "deno fmt")
* added test for globs in "deno lint"
* upgrade "deno_lint" crate to v0.1.9

12 files changed, 165 insertions, 101 deletions

diff --git a/Cargo.lock b/Cargo.lock
index eb3349c1f..cdfd43d5c 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -506,9 +506,9 @@ dependencies = [
 
 [[package]]
 name = "deno_lint"
-version = "0.1.8"
+version = "0.1.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0ca00aa150fff66457af99578360267a988b44b3dd0d7d503571b2e98b15094d"
+checksum = "886dbbba1d26b726e4e6c4c03001b7f21b31384acb2a038e5bce430c42de4190"
 dependencies = [
  "lazy_static",
  "regex",
diff --git a/cli/Cargo.toml b/cli/Cargo.toml
index 667a6e2c3..f8ad6abb9 100644
--- a/cli/Cargo.toml
+++ b/cli/Cargo.toml
@@ -20,7 +20,7 @@ deno_typescript = { path = "../deno_typescript", version = "0.47.1" }
 
 [dependencies]
 deno_core = { path = "../core", version = "0.47.1" }
-deno_lint = { version = "0.1.8" }
+deno_lint = { version = "0.1.9" }
 deno_typescript = { path = "../deno_typescript", version = "0.47.1" }
 
 atty = "0.2.14"
diff --git a/cli/flags.rs b/cli/flags.rs
index f630f4bbf..acfe2f3e9 100644
--- a/cli/flags.rs
+++ b/cli/flags.rs
@@ -588,11 +588,10 @@ fn doc_parse(flags: &mut Flags, matches: &clap::ArgMatches) {
 
 fn lint_parse(flags: &mut Flags, matches: &clap::ArgMatches) {
   unstable_arg_parse(flags, matches);
-  let files = matches
-    .values_of("files")
-    .unwrap()
-    .map(String::from)
-    .collect();
+  let files = match matches.values_of("files") {
+    Some(f) => f.map(String::from).collect(),
+    None => vec![],
+  };
   flags.subcommand = DenoSubcommand::Lint { files };
 }
 
@@ -911,6 +910,7 @@ fn lint_subcommand<'a, 'b>() -> App<'a, 'b> {
     .about("Lint source files")
     .long_about(
       "Lint JavaScript/TypeScript source code.
+  deno lint --unstable
   deno lint --unstable myfile1.ts myfile2.js
 
 Ignore diagnostics on the next line by preceding it with an ignore comment and
@@ -927,8 +927,8 @@ Ignore linting a file by adding an ignore comment at the top of the file:
     .arg(
       Arg::with_name("files")
         .takes_value(true)
-        .required(true)
-        .min_values(1),
+        .multiple(true)
+        .required(false),
     )
 }
 
@@ -1641,6 +1641,37 @@ mod tests {
   }
 
   #[test]
+  fn lint() {
+    let r = flags_from_vec_safe(svec![
+      "deno",
+      "lint",
+      "--unstable",
+      "script_1.ts",
+      "script_2.ts"
+    ]);
+    assert_eq!(
+      r.unwrap(),
+      Flags {
+        subcommand: DenoSubcommand::Lint {
+          files: vec!["script_1.ts".to_string(), "script_2.ts".to_string()]
+        },
+        unstable: true,
+        ..Flags::default()
+      }
+    );
+
+    let r = flags_from_vec_safe(svec!["deno", "lint", "--unstable"]);
+    assert_eq!(
+      r.unwrap(),
+      Flags {
+        subcommand: DenoSubcommand::Lint { files: vec![] },
+        unstable: true,
+        ..Flags::default()
+      }
+    );
+  }
+
+  #[test]
   fn types() {
     let r = flags_from_vec_safe(svec!["deno", "types"]);
     assert_eq!(
diff --git a/cli/fmt.rs b/cli/fmt.rs
index 0d7a909bc..229039606 100644
--- a/cli/fmt.rs
+++ b/cli/fmt.rs
@@ -34,23 +34,8 @@ pub async fn format(args: Vec<String>, check: bool) -> Result<(), ErrBox> {
     return format_stdin(check);
   }
 
-  let mut target_files: Vec<PathBuf> = vec![];
+  let target_files = collect_files(args)?;
 
-  if args.is_empty() {
-    target_files.extend(files_in_subtree(
-      std::env::current_dir().unwrap(),
-      is_supported,
-    ));
-  } else {
-    for arg in args {
-      let p = PathBuf::from(arg);
-      if p.is_dir() {
-        target_files.extend(files_in_subtree(p, is_supported));
-      } else {
-        target_files.push(p);
-      };
-    }
-  }
   let config = get_config();
   if check {
     check_source_files(config, target_files).await
@@ -222,6 +207,26 @@ fn is_supported(path: &Path) -> bool {
   }
 }
 
+pub fn collect_files(files: Vec<String>) -> Result<Vec<PathBuf>, ErrBox> {
+  let mut target_files: Vec<PathBuf> = vec![];
+
+  if files.is_empty() {
+    target_files
+      .extend(files_in_subtree(std::env::current_dir()?, is_supported));
+  } else {
+    for arg in files {
+      let p = PathBuf::from(arg);
+      if p.is_dir() {
+        target_files.extend(files_in_subtree(p, is_supported));
+      } else {
+        target_files.push(p);
+      };
+    }
+  }
+
+  Ok(target_files)
+}
+
 fn get_config() -> dprint::configuration::Configuration {
   use dprint::configuration::*;
   ConfigurationBuilder::new().deno().build()
diff --git a/cli/lint.rs b/cli/lint.rs
new file mode 100644
index 000000000..5dfbcaf40
--- /dev/null
+++ b/cli/lint.rs
@@ -0,0 +1,79 @@
+// 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,
+  )
+}
diff --git a/cli/main.rs b/cli/main.rs
index d3be3bdbe..73349d599 100644
--- a/cli/main.rs
+++ b/cli/main.rs
@@ -42,6 +42,7 @@ mod import_map;
 mod inspector;
 pub mod installer;
 mod js;
+mod lint;
 mod lockfile;
 mod metrics;
 mod module_graph;
@@ -321,7 +322,7 @@ async fn lint_command(flags: Flags, files: Vec<String>) -> Result<(), ErrBox> {
   // state just to perform unstable check...
   use crate::state::State;
   let state = State::new(
-    global_state.clone(),
+    global_state,
     None,
     ModuleSpecifier::resolve_url("file:///dummy.ts").unwrap(),
     None,
@@ -329,56 +330,7 @@ async fn lint_command(flags: Flags, files: Vec<String>) -> Result<(), ErrBox> {
   )?;
 
   state.check_unstable("lint");
-
-  let mut error_counts = 0;
-
-  for file in files {
-    let specifier = ModuleSpecifier::resolve_url_or_path(&file)?;
-    let source_file = global_state
-      .file_fetcher
-      .fetch_source_file(&specifier, None, Permissions::allow_all())
-      .await?;
-    let source_code = String::from_utf8(source_file.source_code)?;
-    let syntax = swc_util::get_syntax_for_media_type(source_file.media_type);
-
-    let mut linter = deno_lint::linter::Linter::default();
-    let lint_rules = deno_lint::rules::get_all_rules();
-
-    let file_diagnostics =
-      linter.lint(file, source_code, syntax, lint_rules)?;
-
-    error_counts += file_diagnostics.len();
-    for d in file_diagnostics.iter() {
-      let pretty_message = format!(
-        "({}) {}",
-        colors::gray(d.code.to_string()),
-        d.message.clone()
-      );
-      eprintln!(
-        "{}\n",
-        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
-        )
-      );
-    }
-  }
-
-  if error_counts > 0 {
-    eprintln!("Found {} problems", error_counts);
-    std::process::exit(1);
-  }
-
-  Ok(())
+  lint::lint_files(files)
 }
 
 async fn cache_command(flags: Flags, files: Vec<String>) -> Result<(), ErrBox> {
diff --git a/cli/tests/integration_tests.rs b/cli/tests/integration_tests.rs
index fafce3eb0..e3f4bd085 100644
--- a/cli/tests/integration_tests.rs
+++ b/cli/tests/integration_tests.rs
@@ -1957,6 +1957,12 @@ itest!(deno_lint {
   exit_code: 1,
 });
 
+itest!(deno_lint_glob {
+  args: "lint --unstable lint/",
+  output: "lint/expected_glob.out",
+  exit_code: 1,
+});
+
 #[test]
 fn cafile_fetch() {
   use url::Url;
diff --git a/cli/tests/lint/expected.out b/cli/tests/lint/expected.out
index 0b0654298..57af15971 100644
--- a/cli/tests/lint/expected.out
+++ b/cli/tests/lint/expected.out
@@ -1,12 +1,12 @@
-(no-var) `var` keyword is not allowed
-var a = 1,
-~~~~~~~~~~
+(ban-untagged-ignore) Ignore directive requires lint rule code
+// deno-lint-ignore
+~~~~~~~~~~~~~~~~~~~
     at [WILDCARD]file1.js:1:0
 
-(single-var-declarator) Multiple variable declarators are not allowed
-var a = 1,
-~~~~~~~~~~
-    at [WILDCARD]file1.js:1:0
+(no-empty) Empty block statement
+while (false) {}
+              ~~
+    at [WILDCARD]file1.js:2:14
 
 (no-empty) Empty block statement
 } catch (e) {}
@@ -23,14 +23,4 @@ function foo(): any {}
 ~~~~~~~~~~~~~~~~~~~~~~
     at [WILDCARD]file2.ts:6:0
 
-(ban-untagged-ignore) Ignore directive requires lint rule code
-// deno-lint-ignore
-~~~~~~~~~~~~~~~~~~~
-    at [WILDCARD]file2.ts:8:0
-
-(no-empty) Empty block statement
-while (false) {}
-              ~~
-    at [WILDCARD]file2.ts:9:14
-
-Found 7 problems
+Found 5 problems
diff --git a/cli/tests/lint/expected_glob.out b/cli/tests/lint/expected_glob.out
new file mode 100644
index 000000000..3e3ebd649
--- /dev/null
+++ b/cli/tests/lint/expected_glob.out
@@ -0,0 +1,2 @@
+[WILDCARD]
+Found 5 problems
diff --git a/cli/tests/lint/file1.js b/cli/tests/lint/file1.js
index d74b6f47a..737f26818 100644
--- a/cli/tests/lint/file1.js
+++ b/cli/tests/lint/file1.js
@@ -1,3 +1,2 @@
-var a = 1,
-  b = 2,
-  c = 3;
+// deno-lint-ignore
+while (false) {}
diff --git a/cli/tests/lint/file2.ts b/cli/tests/lint/file2.ts
index f0f3a3ba3..10c709ba2 100644
--- a/cli/tests/lint/file2.ts
+++ b/cli/tests/lint/file2.ts
@@ -4,6 +4,3 @@ try {
 
 // deno-lint-ignore no-explicit-any require-await
 function foo(): any {}
-
-// deno-lint-ignore
-while (false) {}
diff --git a/cli/tests/std_lint.out b/cli/tests/std_lint.out
new file mode 100644
index 000000000..9d62fcc67
--- /dev/null
+++ b/cli/tests/std_lint.out
@@ -0,0 +1,3 @@
+[WILDCARD]
+
+Found [WILDCARD] problems
\ No newline at end of file