feat(lint): add --compact flag for terse output (#15926)

4 files changed, 105 insertions, 0 deletions

diff --git a/cli/args/flags.rs b/cli/args/flags.rs
index 46fa8c552..a4eca942f 100644
--- a/cli/args/flags.rs
+++ b/cli/args/flags.rs
@@ -154,6 +154,7 @@ pub struct LintFlags {
   pub maybe_rules_include: Option<Vec<String>>,
   pub maybe_rules_exclude: Option<Vec<String>>,
   pub json: bool,
+  pub compact: bool,
 }
 
 #[derive(Clone, Debug, Eq, PartialEq, Deserialize, Serialize)]
@@ -1402,6 +1403,13 @@ Ignore linting a file by adding an ignore comment at the top of the file:
         .takes_value(false),
     )
     .arg(
+      Arg::new("compact")
+        .long("compact")
+        .help("Output lint result in compact format")
+        .takes_value(false)
+        .conflicts_with("json"),
+    )
+    .arg(
       Arg::new("files")
         .takes_value(true)
         .multiple_values(true)
@@ -2584,6 +2592,7 @@ fn lint_parse(flags: &mut Flags, matches: &clap::ArgMatches) {
     .map(|f| f.map(String::from).collect());
 
   let json = matches.is_present("json");
+  let compact = matches.is_present("compact");
   flags.subcommand = DenoSubcommand::Lint(LintFlags {
     files,
     rules,
@@ -2592,6 +2601,7 @@ fn lint_parse(flags: &mut Flags, matches: &clap::ArgMatches) {
     maybe_rules_exclude,
     ignore,
     json,
+    compact,
   });
 }
 
@@ -3686,6 +3696,7 @@ mod tests {
           maybe_rules_include: None,
           maybe_rules_exclude: None,
           json: false,
+          compact: false,
           ignore: vec![],
         }),
         ..Flags::default()
@@ -3712,6 +3723,7 @@ mod tests {
           maybe_rules_include: None,
           maybe_rules_exclude: None,
           json: false,
+          compact: false,
           ignore: vec![],
         }),
         watch: Some(vec![]),
@@ -3740,6 +3752,7 @@ mod tests {
           maybe_rules_include: None,
           maybe_rules_exclude: None,
           json: false,
+          compact: false,
           ignore: vec![],
         }),
         watch: Some(vec![]),
@@ -3760,6 +3773,7 @@ mod tests {
           maybe_rules_include: None,
           maybe_rules_exclude: None,
           json: false,
+          compact: false,
           ignore: vec![
             PathBuf::from("script_1.ts"),
             PathBuf::from("script_2.ts")
@@ -3780,6 +3794,7 @@ mod tests {
           maybe_rules_include: None,
           maybe_rules_exclude: None,
           json: false,
+          compact: false,
           ignore: vec![],
         }),
         ..Flags::default()
@@ -3803,6 +3818,7 @@ mod tests {
           maybe_rules_include: Some(svec!["ban-untagged-todo", "no-undef"]),
           maybe_rules_exclude: Some(svec!["no-const-assign"]),
           json: false,
+          compact: false,
           ignore: vec![],
         }),
         ..Flags::default()
@@ -3820,6 +3836,7 @@ mod tests {
           maybe_rules_include: None,
           maybe_rules_exclude: None,
           json: true,
+          compact: false,
           ignore: vec![],
         }),
         ..Flags::default()
@@ -3844,6 +3861,33 @@ mod tests {
           maybe_rules_include: None,
           maybe_rules_exclude: None,
           json: true,
+          compact: false,
+          ignore: vec![],
+        }),
+        config_flag: ConfigFlag::Path("Deno.jsonc".to_string()),
+        ..Flags::default()
+      }
+    );
+
+    let r = flags_from_vec(svec![
+      "deno",
+      "lint",
+      "--config",
+      "Deno.jsonc",
+      "--compact",
+      "script_1.ts"
+    ]);
+    assert_eq!(
+      r.unwrap(),
+      Flags {
+        subcommand: DenoSubcommand::Lint(LintFlags {
+          files: vec![PathBuf::from("script_1.ts")],
+          rules: false,
+          maybe_rules_tags: None,
+          maybe_rules_include: None,
+          maybe_rules_exclude: None,
+          json: false,
+          compact: true,
           ignore: vec![],
         }),
         config_flag: ConfigFlag::Path("Deno.jsonc".to_string()),
diff --git a/cli/tests/integration/lint_tests.rs b/cli/tests/integration/lint_tests.rs
index 5ed12f59e..6b78e0609 100644
--- a/cli/tests/integration/lint_tests.rs
+++ b/cli/tests/integration/lint_tests.rs
@@ -42,6 +42,13 @@ itest!(json {
     exit_code: 1,
 });
 
+itest!(compact {
+  args:
+    "lint --compact lint/without_config/file1.js lint/without_config/file2.ts lint/without_config/ignored_file.tss",
+    output: "lint/expected_compact.out",
+    exit_code: 1,
+});
+
 itest!(ignore {
   args:
     "lint --ignore=lint/without_config/file1.js,lint/without_config/malformed.js,lint/without_config/lint_with_config/ lint/without_config/",
diff --git a/cli/tests/testdata/lint/expected_compact.out b/cli/tests/testdata/lint/expected_compact.out
new file mode 100644
index 000000000..03b77faa1
--- /dev/null
+++ b/cli/tests/testdata/lint/expected_compact.out
@@ -0,0 +1,5 @@
+[WILDCARD]file1.js: line 1, col 1 - Ignore directive requires lint rule name(s) (ban-untagged-ignore)
+[WILDCARD]file1.js: line 2, col 15 - Empty block statement (no-empty)
+[WILDCARD]file2.ts: line 3, col 14 - Empty block statement (no-empty)
+Found 3 problems
+Checked 2 files
diff --git a/cli/tools/lint.rs b/cli/tools/lint.rs
index da5df3a81..9afc9cd46 100644
--- a/cli/tools/lint.rs
+++ b/cli/tools/lint.rs
@@ -49,12 +49,14 @@ static STDIN_FILE_NAME: &str = "_stdin.ts";
 pub enum LintReporterKind {
   Pretty,
   Json,
+  Compact,
 }
 
 fn create_reporter(kind: LintReporterKind) -> Box<dyn LintReporter + Send> {
   match kind {
     LintReporterKind::Pretty => Box::new(PrettyLintReporter::new()),
     LintReporterKind::Json => Box::new(JsonLintReporter::new()),
+    LintReporterKind::Compact => Box::new(CompactLintReporter::new()),
   }
 }
 
@@ -66,6 +68,7 @@ pub async fn lint(flags: Flags, lint_flags: LintFlags) -> Result<(), AnyError> {
     files: args,
     ignore,
     json,
+    compact,
     ..
   } = lint_flags;
   // First, prepare final configuration.
@@ -104,6 +107,8 @@ pub async fn lint(flags: Flags, lint_flags: LintFlags) -> Result<(), AnyError> {
 
   let reporter_kind = if json {
     LintReporterKind::Json
+  } else if compact {
+    LintReporterKind::Compact
   } else {
     LintReporterKind::Pretty
   };
@@ -413,6 +418,50 @@ impl LintReporter for PrettyLintReporter {
   }
 }
 
+struct CompactLintReporter {
+  lint_count: u32,
+}
+
+impl CompactLintReporter {
+  fn new() -> CompactLintReporter {
+    CompactLintReporter { lint_count: 0 }
+  }
+}
+
+impl LintReporter for CompactLintReporter {
+  fn visit_diagnostic(&mut self, d: &LintDiagnostic, _source_lines: Vec<&str>) {
+    self.lint_count += 1;
+
+    eprintln!(
+      "{}: line {}, col {} - {} ({})",
+      d.filename,
+      d.range.start.line_index + 1,
+      d.range.start.column_index + 1,
+      d.message,
+      d.code
+    )
+  }
+
+  fn visit_error(&mut self, file_path: &str, err: &AnyError) {
+    eprintln!("Error linting: {}", file_path);
+    eprintln!("   {}", err);
+  }
+
+  fn close(&mut self, check_count: usize) {
+    match self.lint_count {
+      1 => info!("Found 1 problem"),
+      n if n > 1 => info!("Found {} problems", self.lint_count),
+      _ => (),
+    }
+
+    match check_count {
+      n if n <= 1 => info!("Checked {} file", n),
+      n if n > 1 => info!("Checked {} files", n),
+      _ => unreachable!(),
+    }
+  }
+}
+
 pub fn format_diagnostic(
   diagnostic_code: &str,
   message_line: &str,