refactor(cli): Pull out policy creation

src/args.rs

@@ -101,7 +101,7 @@ pub(crate) struct Args {
     pub(crate) verbose: clap_verbosity_flag::Verbosity,
 }
 
-#[derive(Debug, StructOpt)]
+#[derive(Debug, Clone, StructOpt)]
 #[structopt(rename_all = "kebab-case")]
 pub(crate) struct FileArgs {
     #[structopt(long, overrides_with("no-binary"))]

src/config.rs

@@ -117,6 +117,17 @@ pub struct Config {
 }
 
 impl Config {
+    pub fn from_dir(cwd: &std::path::Path) -> Result<Option<Self>, anyhow::Error> {
+        let config = if let Some(path) =
+            find_project_file(cwd, &["typos.toml", "_typos.toml", ".typos.toml"])
+        {
+            Some(Self::from_file(&path)?)
+        } else {
+            None
+        };
+        Ok(config)
+    }
+
     pub fn from_file(path: &std::path::Path) -> Result<Self, anyhow::Error> {
         let s = std::fs::read_to_string(path)?;
         Self::from_toml(&s)
@@ -134,14 +145,6 @@ impl Config {
         }
     }
 
-    pub fn derive(cwd: &std::path::Path) -> Result<Self, anyhow::Error> {
-        if let Some(path) = find_project_file(cwd, &["typos.toml", "_typos.toml", ".typos.toml"]) {
-            Self::from_file(&path)
-        } else {
-            Ok(Default::default())
-        }
-    }
-
     pub fn update(&mut self, source: &dyn ConfigSource) {
         if let Some(walk) = source.walk() {
             self.files.update(walk);
@@ -522,15 +525,13 @@ impl DictSource for DictConfig {
 }
 
 fn find_project_file(dir: &std::path::Path, names: &[&str]) -> Option<std::path::PathBuf> {
-    for ancestor in dir.ancestors() {
+    let mut file_path = dir.join("placeholder");
-        let mut file_path = ancestor.join("placeholder");
     for name in names {
         file_path.set_file_name(name);
         if file_path.exists() {
             return Some(file_path);
         }
     }
-    }
     None
 }
 

src/file.rs

@@ -552,11 +552,11 @@ fn fix_buffer(mut buffer: Vec<u8>, typos: impl Iterator<Item = typos::Typo<'stat
 pub fn walk_path(
     walk: ignore::Walk,
     checks: &dyn FileChecker,
-    policy: &crate::policy::Policy,
+    engine: &crate::policy::ConfigEngine,
     reporter: &dyn report::Report,
 ) -> Result<(), ignore::Error> {
     for entry in walk {
-        walk_entry(entry, checks, policy, reporter)?;
+        walk_entry(entry, checks, engine, reporter)?;
     }
     Ok(())
 }
@@ -564,13 +564,13 @@ pub fn walk_path(
 pub fn walk_path_parallel(
     walk: ignore::WalkParallel,
     checks: &dyn FileChecker,
-    policy: &crate::policy::Policy,
+    engine: &crate::policy::ConfigEngine,
     reporter: &dyn report::Report,
 ) -> Result<(), ignore::Error> {
     let error: std::sync::Mutex<Result<(), ignore::Error>> = std::sync::Mutex::new(Ok(()));
     walk.run(|| {
         Box::new(|entry: Result<ignore::DirEntry, ignore::Error>| {
-            match walk_entry(entry, checks, policy, reporter) {
+            match walk_entry(entry, checks, engine, reporter) {
                 Ok(()) => ignore::WalkState::Continue,
                 Err(err) => {
                     *error.lock().unwrap() = Err(err);
@@ -586,7 +586,7 @@ pub fn walk_path_parallel(
 fn walk_entry(
     entry: Result<ignore::DirEntry, ignore::Error>,
     checks: &dyn FileChecker,
-    policy: &crate::policy::Policy,
+    engine: &crate::policy::ConfigEngine,
     reporter: &dyn report::Report,
 ) -> Result<(), ignore::Error> {
     let entry = match entry {
@@ -603,7 +603,8 @@ fn walk_entry(
         } else {
             entry.path()
         };
-        checks.check_file(path, explicit, policy, reporter)?;
+        let policy = engine.policy(path);
+        checks.check_file(path, explicit, &policy, reporter)?;
     }
 
     Ok(())

src/main.rs

@@ -57,7 +57,19 @@ fn run_dump_config(args: &args::Args, output_path: &std::path::Path) -> proc_exi
         path.as_path()
     };
 
-    let config = load_config(cwd, &args).with_code(proc_exit::Code::CONFIG_ERR)?;
+    let storage = typos_cli::policy::ConfigStorage::new();
+    let mut overrides = config::EngineConfig::default();
+    overrides.update(&args.overrides);
+    let mut engine = typos_cli::policy::ConfigEngine::new(&storage);
+    engine.set_isolated(args.isolated).set_overrides(overrides);
+    if let Some(path) = args.custom_config.as_ref() {
+        let custom = config::Config::from_file(path).with_code(proc_exit::Code::CONFIG_ERR)?;
+        engine.set_custom_config(custom);
+    }
+    let config = engine
+        .load_config(cwd)
+        .with_code(proc_exit::Code::CONFIG_ERR)?;
+
     let mut defaulted_config = config::Config::from_defaults();
     defaulted_config.update(&config);
     let output = toml::to_string_pretty(&defaulted_config).with_code(proc_exit::Code::FAILURE)?;
@@ -88,12 +100,21 @@ fn run_checks(args: &args::Args) -> proc_exit::ExitResult {
         } else {
             path.as_path()
         };
-        let config = load_config(cwd, &args).with_code(proc_exit::Code::CONFIG_ERR)?;
 
         let storage = typos_cli::policy::ConfigStorage::new();
-        let engine = typos_cli::policy::ConfigEngine::new(config, &storage);
+        let mut overrides = config::EngineConfig::default();
-        let files = engine.files();
+        overrides.update(&args.overrides);
-        let policy = engine.policy();
+        let mut engine = typos_cli::policy::ConfigEngine::new(&storage);
+        engine.set_isolated(args.isolated).set_overrides(overrides);
+        if let Some(path) = args.custom_config.as_ref() {
+            let custom = config::Config::from_file(path).with_code(proc_exit::Code::CONFIG_ERR)?;
+            engine.set_custom_config(custom);
+        }
+
+        engine
+            .init_dir(cwd)
+            .with_code(proc_exit::Code::CONFIG_ERR)?;
+        let files = engine.files(cwd);
 
         let threads = if path.is_file() { 1 } else { args.threads };
         let single_threaded = threads == 1;
@@ -131,12 +152,12 @@ fn run_checks(args: &args::Args) -> proc_exit::ExitResult {
         };
 
         if single_threaded {
-            typos_cli::file::walk_path(walk.build(), selected_checks, &policy, reporter)
+            typos_cli::file::walk_path(walk.build(), selected_checks, &engine, reporter)
         } else {
             typos_cli::file::walk_path_parallel(
                 walk.build_parallel(),
                 selected_checks,
-                &policy,
+                &engine,
                 reporter,
             )
         }
@@ -189,20 +210,3 @@ fn init_logging(level: Option<log::Level>) {
         builder.init();
     }
 }
-
-fn load_config(cwd: &std::path::Path, args: &args::Args) -> Result<config::Config, anyhow::Error> {
-    let mut config = config::Config::default();
-
-    if !args.isolated {
-        let derived = config::Config::derive(cwd)?;
-        config.update(&derived);
-    }
-    if let Some(path) = args.custom_config.as_ref() {
-        config.update(&config::Config::from_file(path)?);
-    }
-
-    config.update(&args.config);
-    config.default.update(&args.overrides);
-
-    Ok(config)
-}

src/policy.rs

@@ -1,30 +1,142 @@
 pub struct ConfigStorage {
-    arena: typed_arena::Arena<kstring::KString>,
+    arena: std::sync::Mutex<typed_arena::Arena<kstring::KString>>,
 }
 
 impl ConfigStorage {
     pub fn new() -> Self {
         Self {
-            arena: typed_arena::Arena::new(),
+            arena: std::sync::Mutex::new(typed_arena::Arena::new()),
         }
     }
 
     fn get<'s>(&'s self, other: &str) -> &'s str {
-        self.arena.alloc(kstring::KString::from_ref(other))
+        // Safe because we the references are stable once created.
+        //
+        // Trying to get this handled inside of `typed_arena` directly, see
+        // https://github.com/SimonSapin/rust-typed-arena/issues/49#issuecomment-809517312
+        unsafe {
+            std::mem::transmute::<&str, &str>(
+                self.arena
+                    .lock()
+                    .unwrap()
+                    .alloc(kstring::KString::from_ref(other)),
+            )
+        }
     }
 }
 
 pub struct ConfigEngine<'s> {
-    files: crate::config::Walk,
+    storage: &'s ConfigStorage,
-    check_filenames: bool,
+
-    check_files: bool,
+    overrides: Option<crate::config::EngineConfig>,
-    binary: bool,
+    custom: Option<crate::config::Config>,
-    tokenizer: typos::tokens::Tokenizer,
+    isolated: bool,
-    dict: crate::dict::Override<'s, 's, crate::dict::BuiltIn>,
+
+    configs: std::collections::HashMap<std::path::PathBuf, DirConfig>,
+    files: Intern<crate::config::Walk>,
+    tokenizer: Intern<typos::tokens::Tokenizer>,
+    dict: Intern<crate::dict::Override<'s, 's, crate::dict::BuiltIn>>,
 }
 
 impl<'s> ConfigEngine<'s> {
-    pub fn new(config: crate::config::Config, storage: &'s ConfigStorage) -> Self {
+    pub fn new(storage: &'s ConfigStorage) -> Self {
+        Self {
+            storage,
+            overrides: Default::default(),
+            custom: Default::default(),
+            configs: Default::default(),
+            isolated: false,
+            files: Default::default(),
+            tokenizer: Default::default(),
+            dict: Default::default(),
+        }
+    }
+
+    pub fn set_overrides(&mut self, overrides: crate::config::EngineConfig) -> &mut Self {
+        self.overrides = Some(overrides);
+        self
+    }
+
+    pub fn set_custom_config(&mut self, custom: crate::config::Config) -> &mut Self {
+        self.custom = Some(custom);
+        self
+    }
+
+    pub fn set_isolated(&mut self, isolated: bool) -> &mut Self {
+        self.isolated = isolated;
+        self
+    }
+
+    pub fn files(&mut self, cwd: &std::path::Path) -> &crate::config::Walk {
+        let dir = self
+            .configs
+            .get(cwd)
+            .expect("`init_dir` must be called first");
+        self.get_files(dir)
+    }
+
+    pub fn policy(&self, path: &std::path::Path) -> Policy<'_, '_> {
+        let dir = self
+            .get_dir(path)
+            .expect("`files()` should be called first");
+        Policy {
+            check_filenames: dir.check_filenames,
+            check_files: dir.check_files,
+            binary: dir.binary,
+            tokenizer: self.get_tokenizer(dir),
+            dict: self.get_dict(dir),
+        }
+    }
+
+    fn get_files(&self, dir: &DirConfig) -> &crate::config::Walk {
+        self.files.get(dir.files)
+    }
+
+    fn get_tokenizer(&self, dir: &DirConfig) -> &typos::tokens::Tokenizer {
+        self.tokenizer.get(dir.tokenizer)
+    }
+
+    fn get_dict(&self, dir: &DirConfig) -> &dyn typos::Dictionary {
+        self.dict.get(dir.dict)
+    }
+
+    fn get_dir(&self, path: &std::path::Path) -> Option<&DirConfig> {
+        for path in path.ancestors() {
+            if let Some(dir) = self.configs.get(path) {
+                return Some(dir);
+            }
+        }
+        None
+    }
+
+    pub fn load_config(
+        &self,
+        cwd: &std::path::Path,
+    ) -> Result<crate::config::Config, anyhow::Error> {
+        let mut config = crate::config::Config::default();
+
+        if !self.isolated {
+            if let Some(derived) = crate::config::Config::from_dir(cwd)? {
+                config.update(&derived);
+            }
+        }
+        if let Some(custom) = self.custom.as_ref() {
+            config.update(custom);
+        }
+        if let Some(overrides) = self.overrides.as_ref() {
+            config.default.update(overrides);
+        }
+
+        Ok(config)
+    }
+
+    pub fn init_dir(&mut self, cwd: &std::path::Path) -> Result<(), anyhow::Error> {
+        if self.configs.contains_key(cwd) {
+            return Ok(());
+        }
+
+        let config = self.load_config(cwd)?;
+
         let crate::config::Config { files, default } = config;
         let binary = default.binary();
         let check_filename = default.check_filename();
@@ -49,39 +161,69 @@ impl<'s> ConfigEngine<'s> {
         dict.identifiers(
             dict_config
                 .extend_identifiers()
-                .map(|(k, v)| (storage.get(k), storage.get(v))),
+                .map(|(k, v)| (self.storage.get(k), self.storage.get(v))),
         );
         dict.words(
             dict_config
                 .extend_words()
-                .map(|(k, v)| (storage.get(k), storage.get(v))),
+                .map(|(k, v)| (self.storage.get(k), self.storage.get(v))),
         );
 
-        Self {
+        let dict = self.dict.intern(dict);
+        let files = self.files.intern(files);
+        let tokenizer = self.tokenizer.intern(tokenizer);
+
+        let dir = DirConfig {
             files,
             check_filenames: check_filename,
             check_files: check_file,
             binary: binary,
             tokenizer,
             dict,
+        };
+
+        self.configs.insert(cwd.to_owned(), dir);
+        Ok(())
+    }
+}
+
+struct Intern<T> {
+    data: Vec<T>,
+}
+
+impl<T> Intern<T> {
+    pub fn new() -> Self {
+        Self {
+            data: Default::default(),
         }
     }
 
-    pub fn files(&self) -> &crate::config::Walk {
+    pub fn intern(&mut self, value: T) -> usize {
-        &self.files
+        let symbol = self.data.len();
+        self.data.push(value);
+        symbol
     }
 
-    pub fn policy(&self) -> Policy<'_, '_> {
+    pub fn get(&self, symbol: usize) -> &T {
-        Policy {
+        &self.data[symbol]
-            check_filenames: self.check_filenames,
-            check_files: self.check_files,
-            binary: self.binary,
-            tokenizer: &self.tokenizer,
-            dict: &self.dict,
     }
+}
+
+impl<T> Default for Intern<T> {
+    fn default() -> Self {
+        Self::new()
     }
 }
 
+struct DirConfig {
+    files: usize,
+    tokenizer: usize,
+    dict: usize,
+    check_filenames: bool,
+    check_files: bool,
+    binary: bool,
+}
+
 #[non_exhaustive]
 #[derive(derive_setters::Setters)]
 pub struct Policy<'t, 'd> {