Attempt to find selene.toml in parent directories

CHANGELOG.md

@@ -12,6 +12,9 @@ This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.htm
 - Added `ignore_pattern` config to `global_usage`, which will ignore any global variables with names that match the pattern
 - `roblox_incorrect_roact_usage` now checks for incorrect Roact17's `createElement` usage on variables named `React`. For Roact17 only, `key`, `children`, and `ref` are valid properties to Roblox instances.
 
+### Changed
+- If `--config` is not defined, `selene.toml` will now be searched for in the current directory and all parent directories.
+
 ### Fixed
 - `string.pack` and `string.unpack` now have proper function signatures in the Lua 5.3 standard library.
 - Moved `math.log` second argument addition from Lua 5.3 std lib to 5.2 std lib
@@ -404,4 +407,4 @@ This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.htm
 - Added standard library chaining. This means you can combine two standard libraries by setting `std` in selene.toml to `std1+std2`. You can chain as many as you want.
 
 ## [0.1.0](https://github.com/Kampfkarren/selene/releases/tag/0.1.0) - 2019-11-06
-- Initial release
+- Initial release

selene/src/main.rs

@@ -494,6 +494,8 @@ fn start(mut options: opts::Options) {
         None => {}
     }
 
+    let current_dir = std::env::current_dir().unwrap();
+
     let (config, config_directory): (CheckerConfig<toml::value::Value>, Option<PathBuf>) =
         match options.config {
             Some(config_file) => {
@@ -517,20 +519,29 @@ fn start(mut options: opts::Options) {
                 }
             }
 
-            None => match fs::read_to_string("selene.toml") {
-                Ok(config_contents) => match toml::from_str(&config_contents) {
-                    Ok(config) => (config, None),
-                    Err(error) => {
-                        error!("Config file not in correct format: {}", error);
-                        std::process::exit(1);
-                    }
-                },
+            None => {
+                let config_file_path = current_dir
+                    .ancestors()
+                    .map(|path| path.join("selene.toml"))
+                    .find(|path| path.is_file());
 
-                Err(_) => (CheckerConfig::default(), None),
-            },
-        };
+                match config_file_path {
+                    Some(config_file) => match fs::read_to_string(&config_file) {
+                        Ok(config_contents) => match toml::from_str(&config_contents) {
+                            Ok(config) => (config, config_file.parent().map(Path::to_path_buf)),
+                            Err(error) => {
+                                error!("Config file not in correct format: {}", error);
+                                std::process::exit(1);
+                            }
+                        },
 
-    let current_dir = std::env::current_dir().unwrap();
+                        Err(_) => (CheckerConfig::default(), None),
+                    },
+
+                    None => (CheckerConfig::default(), None),
+                }
+            }
+        };
 
     let standard_library = match standard_library::collect_standard_library(
         &config,