Refactor: simplify word navigation logic, improve line wrapping, and enhance parameter initialization across core and TUI modules.

crates/owlen-core/src/router.rs

@@ -106,13 +106,11 @@ impl Router {
             return true;
         }
 
-        if pattern.ends_with('*') {
-            let prefix = &pattern[..pattern.len() - 1];
+        if let Some(prefix) = pattern.strip_suffix('*') {
             return model.starts_with(prefix);
         }
 
-        if pattern.starts_with('*') {
-            let suffix = &pattern[1..];
+        if let Some(suffix) = pattern.strip_prefix('*') {
             return model.ends_with(suffix);
         }
 

crates/owlen-core/src/types.rs

@@ -72,7 +72,7 @@ pub struct ChatRequest {
 }
 
 /// Parameters for chat completion
-#[derive(Debug, Clone, Serialize, Deserialize)]
+#[derive(Debug, Clone, Serialize, Deserialize, Default)]
 pub struct ChatParameters {
     /// Temperature for randomness (0.0 to 2.0)
     #[serde(skip_serializing_if = "Option::is_none")]
@@ -85,20 +85,10 @@ pub struct ChatParameters {
     pub stream: bool,
     /// Additional provider-specific parameters
     #[serde(flatten)]
+    #[serde(default)]
     pub extra: HashMap<String, serde_json::Value>,
 }
 
-impl Default for ChatParameters {
-    fn default() -> Self {
-        Self {
-            temperature: None,
-            max_tokens: None,
-            stream: false,
-            extra: HashMap::new(),
-        }
-    }
-}
-
 /// Response from a chat completion request
 #[derive(Debug, Clone, Serialize, Deserialize)]
 pub struct ChatResponse {

crates/owlen-core/src/ui.rs

@@ -305,9 +305,7 @@ pub fn find_word_end(line: &str, col: usize) -> Option<usize> {
             pos += 1;
         }
         // Move back one to be ON the last character
-        if pos > 0 {
-            pos -= 1;
-        }
+        pos = pos.saturating_sub(1);
     } else {
         // Skip non-word characters
         while pos < chars.len() && !is_word_char(chars[pos]) {
@@ -317,9 +315,7 @@ pub fn find_word_end(line: &str, col: usize) -> Option<usize> {
         while pos < chars.len() && is_word_char(chars[pos]) {
             pos += 1;
         }
-        if pos > 0 {
-            pos -= 1;
-        }
+        pos = pos.saturating_sub(1);
     }
 
     Some(pos)
@@ -336,9 +332,7 @@ pub fn find_prev_word_boundary(line: &str, col: usize) -> Option<usize> {
     let is_word_char = |c: char| c.is_alphanumeric() || c == '_';
 
     // Move back one position first
-    if pos > 0 {
-        pos -= 1;
-    }
+    pos = pos.saturating_sub(1);
 
     // Skip non-word characters
     while pos > 0 && !is_word_char(chars[pos]) {

crates/owlen-core/src/wrap_cursor.rs

@@ -52,23 +52,21 @@ pub fn build_cursor_map(text: &str, width: u16) -> Vec<ScreenPos> {
                 word_start_col = col;
                 word_start_idx = byte_offset + grapheme.len();
             }
-        } else {
-            if col + grapheme_width > width {
-                if word_start_col > 0 && byte_offset == word_start_idx {
-                    // This is the first character of a new word that won't fit, wrap it
-                    row += 1;
-                    col = grapheme_width;
-                } else if word_start_col == 0 {
-                    // No previous word boundary, hard break
-                    row += 1;
-                    col = grapheme_width;
-                } else {
-                    // This is part of a word already on the line, let it extend beyond width
-                    col += grapheme_width;
-                }
+        } else if col + grapheme_width > width {
+            if word_start_col > 0 && byte_offset == word_start_idx {
+                // This is the first character of a new word that won't fit, wrap it
+                row += 1;
+                col = grapheme_width;
+            } else if word_start_col == 0 {
+                // No previous word boundary, hard break
+                row += 1;
+                col = grapheme_width;
             } else {
+                // This is part of a word already on the line, let it extend beyond width
                 col += grapheme_width;
             }
+        } else {
+            col += grapheme_width;
         }
 
         // Set position for the end of this grapheme and any intermediate bytes