rho-coding-agent 2.12.0

//! Sessions owns the evidence-to-card projection; renderers only know receipts.

use rho_tools::tool_card::{ToolBody, ToolCard, ToolFact, ToolFamily, ToolHeader, ToolStatus};
use serde::Deserialize;
use serde_json::Value;

use super::format::string_arg;

pub(super) fn preview_card(arguments: &Value, status: ToolStatus) -> ToolCard {
    let (verb, primary) = match arguments.get("action").and_then(Value::as_str) {
        Some("search") => (
            "sessions.search",
            string_arg(arguments, "query").map(|q| format!("{q:?}")),
        ),
        Some("read") => (
            "sessions.read",
            // Match the eight-character session identity used by the sessions CLI.
            string_arg(arguments, "session").map(|id| id.chars().take(8).collect()),
        ),
        _ => ("sessions", None),
    };
    ToolCard::new(status, ToolFamily::Default, ToolHeader::call(verb, primary))
}

/// Unknown or malformed payloads use the normal visible-output fallback.
/// Errors must never disappear into a collapsed evidence body.
pub(super) fn finished_card(arguments: &Value, content: &str, ok: bool) -> Option<ToolCard> {
    if !ok {
        return None;
    }
    let mut card = preview_card(arguments, ToolStatus::Ok);
    let mut lines = Vec::new();
    let (summary, index) = match arguments.get("action")?.as_str()? {
        "search" => {
            let result: SearchResult = serde_json::from_str(content).ok()?;
            let count = result.sessions.len();
            let noun = if result.total_sessions == 1 {
                "session"
            } else {
                "sessions"
            };
            let mut summary = if result.total_sessions == 0 {
                format!("no matching sessions · {}", result.scope)
            } else if count == result.total_sessions {
                format!("{count} matching {noun} · {}", result.scope)
            } else {
                format!(
                    "{count} of {} matching {noun} · {}",
                    result.total_sessions, result.scope
                )
            };
            if let Some(offset) = result.next_offset {
                summary.push_str(" · more results available");
                lines.push(format!("next search offset: {offset}"));
            }
            if let Some(budget) = result.output_budget_bytes {
                summary.push_str(&format!(" · output limited to {budget} bytes"));
            }
            for group in result.sessions {
                if !lines.is_empty() {
                    lines.push(String::new());
                }
                lines.push(format!("session {} · {}", group.id, group.workspace));
                lines.push(format!("handle: {}", group.session));
                let suffix = if group.matching_messages == 1 {
                    ""
                } else {
                    "s"
                };
                lines.push(format!(
                    "{} matching message{suffix}",
                    group.matching_messages
                ));
                for excerpt in group.excerpts {
                    lines.push(String::new());
                    lines.push(format!(
                        "{} · {} · chars {}–{} of {}",
                        excerpt.role,
                        excerpt.anchor,
                        excerpt.start,
                        excerpt.end,
                        excerpt.total_chars
                    ));
                    lines.extend(excerpt.text.lines().map(str::to_owned));
                    if excerpt.omitted_blocks > 0 {
                        lines.push(format!("{} blocks omitted", excerpt.omitted_blocks));
                    }
                }
                if group.omitted_matches > 0 {
                    lines.push(format!(
                        "{} more matching messages not included",
                        group.omitted_matches
                    ));
                }
            }
            (summary, result.index)
        }
        "read" => {
            let result: ReadResult = serde_json::from_str(content).ok()?;
            let excerpt = result.excerpt;
            let mut summary = format!(
                "{} · chars {}–{} of {}",
                excerpt.role, excerpt.start, excerpt.end, excerpt.total_chars
            );
            if result.next_start.is_some() {
                summary.push_str(" · more available");
            }
            if excerpt.omitted_blocks > 0 {
                summary.push_str(&format!(" · {} blocks omitted", excerpt.omitted_blocks));
            }
            lines.push(format!("session: {}", result.session));
            lines.push(format!("anchor: {}", excerpt.anchor));
            lines.push(String::new());
            lines.extend(excerpt.text.lines().map(str::to_owned));
            if let Some(start) = result.next_start {
                lines.push(format!("passage continues at char {start}"));
            }
            if let Some(anchor) = result.next_anchor {
                lines.push(format!("next anchor: {anchor}"));
            }
            if let Some(anchor) = result.previous_anchor {
                lines.push(format!("previous anchor: {anchor}"));
            }
            (summary, result.index)
        }
        _ => return None,
    };
    card.push_fact(ToolFact::Meta { text: summary });
    if index.skipped_files > 0 || index.omitted_records > 0 {
        card.push_fact(ToolFact::Meta {
            text: format!(
                "index omissions: {} files skipped · {} records omitted",
                index.skipped_files, index.omitted_records
            ),
        });
    }
    card.body = ToolBody::Lines(lines);
    Some(card)
}

#[derive(Deserialize)]
struct SearchResult {
    index: IndexReport,
    scope: String,
    total_sessions: usize,
    next_offset: Option<usize>,
    output_budget_bytes: Option<usize>,
    sessions: Vec<SessionGroup>,
}

#[derive(Deserialize)]
struct SessionGroup {
    session: String,
    id: String,
    workspace: String,
    matching_messages: usize,
    excerpts: Vec<Excerpt>,
    omitted_matches: usize,
}

#[derive(Deserialize)]
struct Excerpt {
    anchor: String,
    role: String,
    start: usize,
    end: usize,
    total_chars: usize,
    text: String,
    omitted_blocks: usize,
}

#[derive(Deserialize)]
struct ReadResult {
    index: IndexReport,
    session: String,
    #[serde(flatten)]
    excerpt: Excerpt,
    next_start: Option<usize>,
    next_anchor: Option<String>,
    previous_anchor: Option<String>,
}

/// Keep incomplete-index notices visible, but omit routine cache statistics.
#[derive(Deserialize)]
struct IndexReport {
    skipped_files: usize,
    omitted_records: usize,
}