Enhance TUI thinking panel: add dynamic height calculation, implement real-time updates from assistant messages, and refine thinking content rendering logic.

crates/owlen-core/src/formatting.rs

@@ -1,5 +1,4 @@
 use crate::types::Message;
-use textwrap::{wrap, Options};
 
 /// Formats messages for display across different clients.
 #[derive(Debug, Clone)]
@@ -38,4 +37,55 @@ impl MessageFormatter {
     pub fn format_message(&self, message: &Message) -> Vec<String> {
         message.content.trim().lines().map(|s| s.to_string()).collect()
     }
+
+    /// Extract thinking content from <think> tags, returning (content_without_think, thinking_content)
+    /// This handles both complete and incomplete (streaming) think tags.
+    pub fn extract_thinking(&self, content: &str) -> (String, Option<String>) {
+        let mut result = String::new();
+        let mut thinking = String::new();
+        let mut current_pos = 0;
+
+        while let Some(start_pos) = content[current_pos..].find("<think>") {
+            let abs_start = current_pos + start_pos;
+
+            // Add content before <think> tag to result
+            result.push_str(&content[current_pos..abs_start]);
+
+            // Find closing tag
+            if let Some(end_pos) = content[abs_start..].find("</think>") {
+                let abs_end = abs_start + end_pos;
+                let think_content = &content[abs_start + 7..abs_end]; // 7 = len("<think>")
+
+                if !thinking.is_empty() {
+                    thinking.push_str("\n\n");
+                }
+                thinking.push_str(think_content.trim());
+
+                current_pos = abs_end + 8; // 8 = len("</think>")
+            } else {
+                // Unclosed tag - this is streaming content
+                // Extract everything after <think> as thinking content
+                let think_content = &content[abs_start + 7..]; // 7 = len("<think>")
+
+                if !thinking.is_empty() {
+                    thinking.push_str("\n\n");
+                }
+                thinking.push_str(think_content);
+
+                current_pos = content.len();
+                break;
+            }
+        }
+
+        // Add remaining content
+        result.push_str(&content[current_pos..]);
+
+        let thinking_result = if thinking.is_empty() {
+            None
+        } else {
+            Some(thinking)
+        };
+
+        (result, thinking_result)
+    }
 }