diff --git a/benches/file.rs b/benches/file.rs
index 0cfea12..d25c7d1 100644
--- a/benches/file.rs
+++ b/benches/file.rs
@@ -14,17 +14,8 @@ fn process_empty(b: &mut test::Bencher) {
 
     let corrections = typos::Dictionary::new();
     let parser = typos::tokens::Parser::new();
-    b.iter(|| {
-        typos::process_file(
-            sample_path.path(),
-            &corrections,
-            true,
-            true,
-            &parser,
-            false,
-            typos::report::print_silent,
-        )
-    });
+    let checks = typos::checks::CheckSettings::new().build(&corrections, &parser);
+    b.iter(|| checks.check_file(sample_path.path(), typos::report::print_silent));
 
     temp.close().unwrap();
 }
@@ -37,17 +28,8 @@ fn process_no_tokens(b: &mut test::Bencher) {
 
     let corrections = typos::Dictionary::new();
     let parser = typos::tokens::Parser::new();
-    b.iter(|| {
-        typos::process_file(
-            sample_path.path(),
-            &corrections,
-            true,
-            true,
-            &parser,
-            false,
-            typos::report::print_silent,
-        )
-    });
+    let checks = typos::checks::CheckSettings::new().build(&corrections, &parser);
+    b.iter(|| checks.check_file(sample_path.path(), typos::report::print_silent));
 
     temp.close().unwrap();
 }
@@ -60,17 +42,8 @@ fn process_single_token(b: &mut test::Bencher) {
 
     let corrections = typos::Dictionary::new();
     let parser = typos::tokens::Parser::new();
-    b.iter(|| {
-        typos::process_file(
-            sample_path.path(),
-            &corrections,
-            true,
-            true,
-            &parser,
-            false,
-            typos::report::print_silent,
-        )
-    });
+    let checks = typos::checks::CheckSettings::new().build(&corrections, &parser);
+    b.iter(|| checks.check_file(sample_path.path(), typos::report::print_silent));
 
     temp.close().unwrap();
 }
@@ -83,17 +56,8 @@ fn process_sherlock(b: &mut test::Bencher) {
 
     let corrections = typos::Dictionary::new();
     let parser = typos::tokens::Parser::new();
-    b.iter(|| {
-        typos::process_file(
-            sample_path.path(),
-            &corrections,
-            true,
-            true,
-            &parser,
-            false,
-            typos::report::print_silent,
-        )
-    });
+    let checks = typos::checks::CheckSettings::new().build(&corrections, &parser);
+    b.iter(|| checks.check_file(sample_path.path(), typos::report::print_silent));
 
     temp.close().unwrap();
 }
@@ -106,17 +70,8 @@ fn process_code(b: &mut test::Bencher) {
 
     let corrections = typos::Dictionary::new();
     let parser = typos::tokens::Parser::new();
-    b.iter(|| {
-        typos::process_file(
-            sample_path.path(),
-            &corrections,
-            true,
-            true,
-            &parser,
-            false,
-            typos::report::print_silent,
-        )
-    });
+    let checks = typos::checks::CheckSettings::new().build(&corrections, &parser);
+    b.iter(|| checks.check_file(sample_path.path(), typos::report::print_silent));
 
     temp.close().unwrap();
 }
@@ -129,17 +84,8 @@ fn process_corpus(b: &mut test::Bencher) {
 
     let corrections = typos::Dictionary::new();
     let parser = typos::tokens::Parser::new();
-    b.iter(|| {
-        typos::process_file(
-            sample_path.path(),
-            &corrections,
-            true,
-            true,
-            &parser,
-            false,
-            typos::report::print_silent,
-        )
-    });
+    let checks = typos::checks::CheckSettings::new().build(&corrections, &parser);
+    b.iter(|| checks.check_file(sample_path.path(), typos::report::print_silent));
 
     temp.close().unwrap();
 }
diff --git a/src/checks.rs b/src/checks.rs
new file mode 100644
index 0000000..308d724
--- /dev/null
+++ b/src/checks.rs
@@ -0,0 +1,171 @@
+use std::fs::File;
+use std::io::Read;
+
+use bstr::ByteSlice;
+
+use crate::report;
+use crate::tokens;
+use crate::Dictionary;
+
+pub struct CheckSettings {
+    check_filenames: bool,
+    check_files: bool,
+    binary: bool,
+}
+
+impl CheckSettings {
+    pub fn new() -> Self {
+        Default::default()
+    }
+
+    pub fn check_filenames(&mut self, yes: bool) -> &mut Self {
+        self.check_filenames = yes;
+        self
+    }
+
+    pub fn check_files(&mut self, yes: bool) -> &mut Self {
+        self.check_files = yes;
+        self
+    }
+
+    pub fn binary(&mut self, yes: bool) -> &mut Self {
+        self.binary = yes;
+        self
+    }
+
+    pub fn build<'d, 'p>(
+        &self,
+        dictionary: &'d Dictionary,
+        parser: &'p tokens::Parser,
+    ) -> Checks<'d, 'p> {
+        Checks {
+            dictionary,
+            parser,
+            check_filenames: self.check_filenames,
+            check_files: self.check_files,
+            binary: self.binary,
+        }
+    }
+}
+
+impl Default for CheckSettings {
+    fn default() -> Self {
+        Self {
+            check_filenames: true,
+            check_files: true,
+            binary: false,
+        }
+    }
+}
+
+pub struct Checks<'d, 'p> {
+    dictionary: &'d Dictionary,
+    parser: &'p tokens::Parser,
+    check_filenames: bool,
+    check_files: bool,
+    binary: bool,
+}
+
+impl<'d, 'p> Checks<'d, 'p> {
+    pub fn check_filename(
+        &self,
+        path: &std::path::Path,
+        report: report::Report,
+    ) -> Result<bool, failure::Error> {
+        let mut typos_found = false;
+
+        if !self.check_filenames {
+            return Ok(typos_found);
+        }
+
+        for part in path.components().filter_map(|c| c.as_os_str().to_str()) {
+            for ident in self.parser.parse(part) {
+                if let Some(correction) = self.dictionary.correct_ident(ident) {
+                    let msg = report::FilenameCorrection {
+                        path,
+                        typo: ident.token(),
+                        correction,
+                        non_exhaustive: (),
+                    };
+                    report(msg.into());
+                    typos_found = true;
+                }
+                for word in ident.split() {
+                    if let Some(correction) = self.dictionary.correct_word(word) {
+                        let msg = report::FilenameCorrection {
+                            path,
+                            typo: word.token(),
+                            correction,
+                            non_exhaustive: (),
+                        };
+                        report(msg.into());
+                        typos_found = true;
+                    }
+                }
+            }
+        }
+
+        Ok(typos_found)
+    }
+
+    pub fn check_file(
+        &self,
+        path: &std::path::Path,
+        report: report::Report,
+    ) -> Result<bool, failure::Error> {
+        let mut typos_found = false;
+
+        if !self.check_files {
+            return Ok(typos_found);
+        }
+
+        let mut buffer = Vec::new();
+        File::open(path)?.read_to_end(&mut buffer)?;
+        if !self.binary && buffer.find_byte(b'\0').is_some() {
+            let msg = report::BinaryFile {
+                path,
+                non_exhaustive: (),
+            };
+            report(msg.into());
+            return Ok(typos_found);
+        }
+
+        for (line_idx, line) in buffer.lines().enumerate() {
+            let line_num = line_idx + 1;
+            for ident in self.parser.parse_bytes(line) {
+                if let Some(correction) = self.dictionary.correct_ident(ident) {
+                    let col_num = ident.offset();
+                    let msg = report::Correction {
+                        path,
+                        line,
+                        line_num,
+                        col_num,
+                        typo: ident.token(),
+                        correction,
+                        non_exhaustive: (),
+                    };
+                    typos_found = true;
+                    report(msg.into());
+                }
+                for word in ident.split() {
+                    if let Some(correction) = self.dictionary.correct_word(word) {
+                        let col_num = word.offset();
+                        let msg = report::Correction {
+                            path,
+                            line,
+                            line_num,
+                            col_num,
+                            typo: word.token(),
+                            correction,
+                            non_exhaustive: (),
+                        };
+                        typos_found = true;
+                        report(msg.into());
+                    }
+                }
+            }
+        }
+
+        Ok(typos_found)
+    }
+}
diff --git a/src/lib.rs b/src/lib.rs
index fb61469..b5201df 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -4,104 +4,8 @@ extern crate serde_derive;
 mod dict;
 mod dict_codegen;
 
+pub mod checks;
 pub mod report;
 pub mod tokens;
 
 pub use crate::dict::*;
-
-use std::fs::File;
-use std::io::Read;
-
-use bstr::ByteSlice;
-
-pub fn process_file(
-    path: &std::path::Path,
-    dictionary: &Dictionary,
-    check_filenames: bool,
-    check_files: bool,
-    parser: &tokens::Parser,
-    binary: bool,
-    report: report::Report,
-) -> Result<bool, failure::Error> {
-    let mut typos_found = false;
-
-    if check_filenames {
-        for part in path.components().filter_map(|c| c.as_os_str().to_str()) {
-            for ident in parser.parse(part) {
-                if let Some(correction) = dictionary.correct_ident(ident) {
-                    let msg = report::FilenameCorrection {
-                        path,
-                        typo: ident.token(),
-                        correction,
-                        non_exhaustive: (),
-                    };
-                    report(msg.into());
-                    typos_found = true;
-                }
-                for word in ident.split() {
-                    if let Some(correction) = dictionary.correct_word(word) {
-                        let msg = report::FilenameCorrection {
-                            path,
-                            typo: word.token(),
-                            correction,
-                            non_exhaustive: (),
-                        };
-                        report(msg.into());
-                        typos_found = true;
-                    }
-                }
-            }
-        }
-    }
-
-    if check_files {
-        let mut buffer = Vec::new();
-        File::open(path)?.read_to_end(&mut buffer)?;
-        if !binary && buffer.find_byte(b'\0').is_some() {
-            let msg = report::BinaryFile {
-                path,
-                non_exhaustive: (),
-            };
-            report(msg.into());
-            return Ok(typos_found);
-        }
-
-        for (line_idx, line) in buffer.lines().enumerate() {
-            let line_num = line_idx + 1;
-            for ident in parser.parse_bytes(line) {
-                if let Some(correction) = dictionary.correct_ident(ident) {
-                    let col_num = ident.offset();
-                    let msg = report::Correction {
-                        path,
-                        line,
-                        line_num,
-                        col_num,
-                        typo: ident.token(),
-                        correction,
-                        non_exhaustive: (),
-                    };
-                    typos_found = true;
-                    report(msg.into());
-                }
-                for word in ident.split() {
-                    if let Some(correction) = dictionary.correct_word(word) {
-                        let col_num = word.offset();
-                        let msg = report::Correction {
-                            path,
-                            line,
-                            line_num,
-                            col_num,
-                            typo: word.token(),
-                            correction,
-                            non_exhaustive: (),
-                        };
-                        typos_found = true;
-                        report(msg.into());
-                    }
-                }
-            }
-        }
-    }
-
-    Ok(typos_found)
-}
diff --git a/src/main.rs b/src/main.rs
index a512db9..efe688e 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -255,16 +255,23 @@ fn run() -> Result<i32, failure::Error> {
     let mut builder = get_logging(options.verbose.log_level());
     builder.init();
 
-    let dictionary = typos::Dictionary::new();
     let check_filenames = options.check_filenames().unwrap_or(true);
     let check_files = options.check_files().unwrap_or(true);
     let ignore_hex = options.ignore_hex().unwrap_or(true);
     let binary = options.binary().unwrap_or(false);
 
+    let dictionary = typos::Dictionary::new();
+
     let parser = typos::tokens::ParserBuilder::new()
         .ignore_hex(ignore_hex)
         .build();
 
+    let checks = typos::checks::CheckSettings::new()
+        .check_filenames(check_filenames)
+        .check_files(check_files)
+        .binary(binary)
+        .build(&dictionary, &parser);
+
     let first_path = &options
         .path
         .get(0)
@@ -283,15 +290,10 @@ fn run() -> Result<i32, failure::Error> {
     for entry in walk.build() {
         let entry = entry?;
         if entry.file_type().map(|t| t.is_file()).unwrap_or(true) {
-            if typos::process_file(
-                entry.path(),
-                &dictionary,
-                check_filenames,
-                check_files,
-                &parser,
-                binary,
-                options.format.report(),
-            )? {
+            if checks.check_filename(entry.path(), options.format.report())? {
+                typos_found = true;
+            }
+            if checks.check_file(entry.path(), options.format.report())? {
                 typos_found = true;
             }
         }