From d599b1cb2d1a3ecc0578f5e7fb82e82c283451ab Mon Sep 17 00:00:00 2001
From: Sysix <sysix@sysix-coding.de>
Date: Mon, 18 Nov 2024 20:41:29 +0100
Subject: [PATCH] feat(oxlint): auto detect config file in CLI

---
 .../auto_config_detection/debugger.js         |  1 +
 .../auto_config_detection/oxlint.json         |  5 +++
 apps/oxlint/src/lint.rs                       | 38 +++++++++++++++++--
 3 files changed, 41 insertions(+), 3 deletions(-)
 create mode 100644 apps/oxlint/fixtures/auto_config_detection/debugger.js
 create mode 100644 apps/oxlint/fixtures/auto_config_detection/oxlint.json

diff --git a/apps/oxlint/fixtures/auto_config_detection/debugger.js b/apps/oxlint/fixtures/auto_config_detection/debugger.js
new file mode 100644
index 0000000000000..eab74692130a6
--- /dev/null
+++ b/apps/oxlint/fixtures/auto_config_detection/debugger.js
@@ -0,0 +1 @@
+debugger;
diff --git a/apps/oxlint/fixtures/auto_config_detection/oxlint.json b/apps/oxlint/fixtures/auto_config_detection/oxlint.json
new file mode 100644
index 0000000000000..a63d73a1442b8
--- /dev/null
+++ b/apps/oxlint/fixtures/auto_config_detection/oxlint.json
@@ -0,0 +1,5 @@
+{
+  "rules": {
+    "no-debugger": "error"
+  }
+}
diff --git a/apps/oxlint/src/lint.rs b/apps/oxlint/src/lint.rs
index 52049828c588b..550ac8106d4bd 100644
--- a/apps/oxlint/src/lint.rs
+++ b/apps/oxlint/src/lint.rs
@@ -99,9 +99,11 @@ impl Runner for LintRunner {
 
         let cwd = std::env::current_dir().unwrap();
 
-        let mut oxlintrc = if let Some(config_path) = basic_options.config.as_ref() {
+        let mut oxlintrc = Oxlintrc::default();
+
+        if let Some(config_path) = basic_options.config.as_ref() {
             match Oxlintrc::from_file(config_path) {
-                Ok(config) => config,
+                Ok(config) => oxlintrc = config,
                 Err(diagnostic) => {
                     let handler = GraphicalReportHandler::new();
                     let mut err = String::new();
@@ -112,7 +114,27 @@ impl Runner for LintRunner {
                 }
             }
         } else {
-            Oxlintrc::default()
+            // no config argument is provided,
+            // auto detect possible files from current work directory
+            let search_configs = &[
+                "oxlintrc.json",
+                "oxlint.json",
+                ".oxlintrc.json",
+                ".oxlint.json",
+                ".oxlintrc",
+                ".eslintrc",
+                ".eslintrc.json",
+            ];
+
+            for config_file in search_configs {
+                let mut config_path = cwd.clone();
+                config_path.push(config_file);
+
+                if let Ok(result) = Oxlintrc::from_file(&config_path) {
+                    oxlintrc = result;
+                    break;
+                };
+            }
         };
 
         enable_plugins.apply_overrides(&mut oxlintrc.plugins);
@@ -387,6 +409,16 @@ mod test {
         assert_eq!(result.number_of_errors, 0);
     }
 
+    // ToDo: enable test when we can change the `cwd` of the process
+    // #[test]
+    // fn oxlint_config_auto_detection() {
+    //     let args = &["fixtures/auto_config_detection/debugger.js"];
+    //     let result = test(args);
+    //     assert_eq!(result.number_of_files, 1);
+    //     assert_eq!(result.number_of_warnings, 0);
+    //     assert_eq!(result.number_of_errors, 1);
+    // }
+
     #[test]
     fn eslintrc_no_undef() {
         let args = &[