phi_agent/render/
terminal.rs

1use std::io::{self, Write};
2
3use agent_base::{AgentResult, PlanStepStatus, RuntimeEvent};
4
5use crate::render::EventRenderer;
6
7/// Rich terminal renderer — colors, emoji, formatted output.
8///
9/// Streams AI responses in real-time, displays tool calls with icons, and
10/// shows turn summaries including duration and tool call count.
11pub struct TerminalRenderer {
12    show_thinking: bool,
13    show_tool_args: bool,
14    color: bool,
15    writer: Box<dyn Write + Send>,
16    tool_call_count: u32,
17    turn_start: Option<std::time::Instant>,
18    last_assistant_text: String,
19    last_was_thought: bool,
20}
21
22impl TerminalRenderer {
23    /// Create a new terminal renderer.
24    ///
25    /// - `show_thinking` — display the LLM's chain-of-thought
26    /// - `show_tool_args` — display tool call arguments inline
27    /// - `color` — enable ANSI color codes
28    /// - `writer` — output destination (usually stdout, can be a WebSocket, etc.)
29    pub fn new(show_thinking: bool, show_tool_args: bool, color: bool, writer: Box<dyn Write + Send>) -> Self {
30        Self {
31            show_thinking,
32            show_tool_args,
33            color,
34            writer,
35            tool_call_count: 0,
36            turn_start: None,
37            last_assistant_text: String::new(),
38            last_was_thought: false,
39        }
40    }
41
42    pub fn stdout(show_thinking: bool, show_tool_args: bool, color: bool) -> Self {
43        Self::new(show_thinking, show_tool_args, color, Box::new(io::stdout()))
44    }
45
46    fn green(&self, s: &str) -> String {
47        if self.color { format!("\x1b[32m{}\x1b[0m", s) } else { s.to_string() }
48    }
49
50    fn dim(&self, s: &str) -> String {
51        if self.color { format!("\x1b[2m{}\x1b[0m", s) } else { s.to_string() }
52    }
53
54    fn bold(&self, s: &str) -> String {
55        if self.color { format!("\x1b[1m{}\x1b[0m", s) } else { s.to_string() }
56    }
57
58    fn yellow(&self, s: &str) -> String {
59        if self.color { format!("\x1b[33m{}\x1b[0m", s) } else { s.to_string() }
60    }
61
62    fn subtle(&self, s: &str) -> String {
63        if self.color { format!("\x1b[90m{}\x1b[0m", s) } else { s.to_string() }
64    }
65
66    fn write_line(&mut self, s: &str) -> AgentResult<()> {
67        writeln!(self.writer, "{}", s).map_err(|e| agent_base::AgentError::internal(format!("write error: {e}")))?;
68        self.writer.flush().map_err(|e| agent_base::AgentError::internal(format!("flush error: {e}")))?;
69        Ok(())
70    }
71
72    /// Write without newline — for streaming text fragments
73    fn write_text(&mut self, s: &str) -> AgentResult<()> {
74        write!(self.writer, "{}", s).map_err(|e| agent_base::AgentError::internal(format!("write error: {e}")))?;
75        self.writer.flush().map_err(|e| agent_base::AgentError::internal(format!("flush error: {e}")))?;
76        Ok(())
77    }
78}
79
80impl EventRenderer for TerminalRenderer {
81    fn render(&mut self, event: RuntimeEvent) -> AgentResult<()> {
82        if self.turn_start.is_none() {
83            self.turn_start = Some(std::time::Instant::now());
84        }
85
86        match &event {
87            RuntimeEvent::ThoughtDelta { text, .. } => {
88                if self.show_thinking {
89                    self.write_text(&self.dim(text))?;
90                }
91                self.last_was_thought = true;
92            },
93            RuntimeEvent::TextDelta { text, .. } => {
94                if self.last_was_thought {
95                    let _ = writeln!(self.writer);
96                    self.last_was_thought = false;
97                }
98                self.last_assistant_text.push_str(text);
99                self.write_text(text)?;
100            },
101            RuntimeEvent::ToolCallStarted { tool_name, args_json, .. } => {
102                self.last_was_thought = false;
103                self.tool_call_count += 1;
104                if self.show_tool_args {
105                    self.write_line(&format!(
106                        "\n{} {} {}",
107                        self.bold("\u{1F527}"),
108                        self.green(tool_name),
109                        self.dim(args_json),
110                    ))?;
111                } else {
112                    self.write_line(&format!("\n{} {}", self.bold("\u{1F527}"), self.green(tool_name),))?;
113                }
114            },
115            RuntimeEvent::ToolCallFinished { tool_name: _, summary, .. } => {
116                let summary_short: String = if summary.chars().count() > 500 {
117                    let truncated: String = summary.chars().take(500).collect();
118                    format!("{}...", truncated)
119                } else {
120                    summary.clone()
121                };
122                self.write_line(&format!("   {} {}", self.dim("→"), self.dim(&summary_short)))?;
123                // Add a blank line after tool completion for readability
124                let _ = writeln!(self.writer);
125            },
126            RuntimeEvent::AwaitingApproval { request, .. } => {
127                self.write_line(&format!("\n⚠️  {} [{:?}] — {}", request.title, request.risk_level, request.message,))?;
128            },
129            RuntimeEvent::PlanUpdated { explanation, plan, .. } => {
130                self.write_line(&format!("\n\u{1F4CB} {}", self.bold("Plan Update")))?;
131                self.write_line(&format!("   {}", self.dim(explanation.as_deref().unwrap_or(""))))?;
132                for item in plan {
133                    let icon = match item.status {
134                        PlanStepStatus::Completed => "✅",
135                        PlanStepStatus::InProgress => "\u{1F504}",
136                        PlanStepStatus::Pending => "⏳",
137                    };
138                    self.write_line(&format!("   {} {}", icon, item.step))?;
139                }
140                let _ = writeln!(self.writer);
141            },
142            RuntimeEvent::RunCancelled { .. } => {
143                self.write_line(&format!("\n{} Cancelled", self.yellow("⚠")))?;
144            },
145            RuntimeEvent::RunFinished { .. } => {},
146            RuntimeEvent::UserEvent { .. } => {},
147            RuntimeEvent::Checkpoint { .. } => {},
148        }
149
150        Ok(())
151    }
152
153    fn finish_turn(&mut self) -> AgentResult<()> {
154        let duration_ms = self.turn_start.map(|s| s.elapsed().as_millis() as u64).unwrap_or(0);
155
156        let duration_str = if duration_ms >= 1000 {
157            format!("{:.1}s", duration_ms as f64 / 1000.0)
158        } else {
159            format!("{}ms", duration_ms)
160        };
161
162        writeln!(
163            self.writer,
164            "\n{}",
165            self.subtle(&format!("· {} elapsed · {} tool call(s)", duration_str, self.tool_call_count)),
166        )
167        .map_err(|e| agent_base::AgentError::internal(format!("write error: {e}")))?;
168
169        self.tool_call_count = 0;
170        self.turn_start = None;
171        self.last_assistant_text.clear();
172        self.last_was_thought = false;
173
174        Ok(())
175    }
176}
phi_agent/render/terminal.rs

phi_agent/render/
terminal.rs
