refactored every component thoroughly.

src/files/detector.rs

@@ -0,0 +1,107 @@
+use std::{fs, path::Path};
+
+pub fn is_text_file(path: &Path) -> bool {
+    let text_extensions = [
+        "txt", "md", "rs", "py", "js", "ts", "jsx", "tsx", "html", "css", "json", "xml", "csv",
+        "yaml", "yml", "toml", "ini", "cfg", "conf", "log", "sh", "bat", "ps1", "sql", "c", "cpp",
+        "h", "hpp", "java", "go", "rb", "php", "swift", "kt", "scala", "lua", "r", "m",
+    ];
+
+    if let Some(ext) = path.extension()
+        && let Some(ext_str) = ext.to_str()
+    {
+        return text_extensions.contains(&ext_str.to_lowercase().as_str());
+    }
+    false
+}
+
+pub fn read_file_sample(path: &Path, max_chars: usize) -> Option<String> {
+    use std::io::Read;
+    let file = match fs::File::open(path) {
+        Ok(f) => f,
+        Err(_) => return None,
+    };
+
+    let mut buffer = Vec::new();
+    let mut handle = file.take(max_chars as u64);
+    if handle.read_to_end(&mut buffer).is_err() {
+        return None;
+    }
+
+    String::from_utf8(buffer).ok()
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use std::fs::File;
+    use std::io::Write;
+    use std::path::Path;
+
+    #[test]
+    fn test_is_text_file_with_text_extensions() {
+        assert!(is_text_file(Path::new("test.txt")));
+        assert!(is_text_file(Path::new("test.rs")));
+        assert!(is_text_file(Path::new("test.py")));
+        assert!(is_text_file(Path::new("test.md")));
+        assert!(is_text_file(Path::new("test.json")));
+    }
+
+    #[test]
+    fn test_is_text_file_with_binary_extensions() {
+        assert!(!is_text_file(Path::new("test.exe")));
+        assert!(!is_text_file(Path::new("test.bin")));
+        assert!(!is_text_file(Path::new("test.jpg")));
+        assert!(!is_text_file(Path::new("test.pdf")));
+    }
+
+    #[test]
+    fn test_is_text_file_case_insensitive() {
+        assert!(is_text_file(Path::new("test.TXT")));
+        assert!(is_text_file(Path::new("test.RS")));
+        assert!(is_text_file(Path::new("test.Py")));
+    }
+
+    #[test]
+    fn test_read_file_sample() {
+        let temp_dir = tempfile::tempdir().unwrap();
+        let file_path = temp_dir.path().join("test.txt");
+
+        let mut file = File::create(&file_path).unwrap();
+        file.write_all(b"Hello, World!").unwrap();
+
+        let content = read_file_sample(&file_path, 1000);
+        assert_eq!(content, Some("Hello, World!".to_string()));
+    }
+
+    #[test]
+    fn test_read_file_sample_with_limit() {
+        let temp_dir = tempfile::tempdir().unwrap();
+        let file_path = temp_dir.path().join("test.txt");
+
+        let mut file = File::create(&file_path).unwrap();
+        file.write_all(b"Hello, World! This is a long text.")
+            .unwrap();
+
+        let content = read_file_sample(&file_path, 5);
+        assert_eq!(content, Some("Hello".to_string()));
+    }
+
+    #[test]
+    fn test_read_file_sample_binary_file() {
+        let temp_dir = tempfile::tempdir().unwrap();
+        let file_path = temp_dir.path().join("test.bin");
+
+        let mut file = File::create(&file_path).unwrap();
+        file.write_all(&[0x00, 0xFF, 0x80, 0x90]).unwrap();
+
+        let content = read_file_sample(&file_path, 1000);
+        assert_eq!(content, None);
+    }
+
+    #[test]
+    fn test_read_file_sample_nonexistent() {
+        let content = read_file_sample(Path::new("/nonexistent/file.txt"), 1000);
+        assert_eq!(content, None);
+    }
+}