feat(config): Find config for each path passed in

src/config.rs

@@ -57,6 +57,14 @@ impl Config {
         Ok(content)
     }
 
+    pub fn derive(cwd: &std::path::Path) -> Result<Self, failure::Error> {
+        if let Some(path) = find_project_file(cwd.to_owned(), "typos.toml") {
+            Self::from_file(&path)
+        } else {
+            Ok(Default::default())
+        }
+    }
+
     pub fn update(&mut self, source: &dyn ConfigSource) {
         if let Some(source) = source.ignore_hidden() {
             self.ignore_hidden = Some(source);
@@ -138,3 +146,17 @@ impl ConfigSource for Config {
         self.ignore_parent
     }
 }
+
+fn find_project_file(dir: std::path::PathBuf, name: &str) -> Option<std::path::PathBuf> {
+    let mut file_path = dir;
+    file_path.push(name);
+    while !file_path.exists() {
+        file_path.pop(); // filename
+        let hit_bottom = !file_path.pop();
+        if hit_bottom {
+            return None;
+        }
+        file_path.push(name);
+    }
+    Some(file_path)
+}

src/main.rs

@@ -46,6 +46,10 @@ struct Options {
     /// Custom config file
     custom_config: Option<std::path::PathBuf>,
 
+    #[structopt(long = "isolated")]
+    /// Ignore implicit configuration files.
+    isolated: bool,
+
     #[structopt(long, raw(overrides_with = r#""check-filenames""#))]
     /// Skip verifying spelling in file names.
     no_check_filenames: bool,
@@ -255,13 +259,6 @@ pub fn get_logging(level: log::Level) -> env_logger::Builder {
 fn run() -> Result<i32, failure::Error> {
     let options = Options::from_args().infer();
 
-    let mut config = config::Config::default();
-    if let Some(path) = options.custom_config.as_ref() {
-        let custom = config::Config::from_file(path)?;
-        config.update(&custom);
-    }
-    config.update(&options);
-
     let mut builder = get_logging(options.verbose.log_level());
     builder.init();
 
@@ -282,21 +279,37 @@ fn run() -> Result<i32, failure::Error> {
         .binary(binary)
         .build(&dictionary, &parser);
 
-    let first_path = &options
-        .path
-        .get(0)
-        .expect("arg parsing enforces at least one");
-    let mut walk = ignore::WalkBuilder::new(first_path);
-    for path in &options.path[1..] {
-        walk.add(path);
+    let mut config = config::Config::default();
+    if let Some(path) = options.custom_config.as_ref() {
+        let custom = config::Config::from_file(path)?;
+        config.update(&custom);
     }
+    let config = config;
+
+    let mut typos_found = false;
+    for path in options.path.iter() {
+        let path = path.canonicalize()?;
+        let cwd = if path.is_file() {
+            path.parent().unwrap()
+        } else {
+            path.as_path()
+        };
+
+        let mut config = config.clone();
+        if !options.isolated {
+            let derived = config::Config::derive(cwd)?;
+            config.update(&derived);
+        }
+        config.update(&options);
+        let config = config;
+
+        let mut walk = ignore::WalkBuilder::new(path);
         walk.hidden(config.ignore_hidden())
             .ignore(config.ignore_dot())
             .git_global(config.ignore_global())
             .git_ignore(config.ignore_vcs())
             .git_exclude(config.ignore_vcs())
             .parents(config.ignore_parent());
-    let mut typos_found = false;
         for entry in walk.build() {
             let entry = entry?;
             if entry.file_type().map(|t| t.is_file()).unwrap_or(true) {
@@ -309,6 +322,7 @@ fn run() -> Result<i32, failure::Error> {
                 }
             }
         }
+    }
 
     if typos_found {
         Ok(1)