rho-coding-agent 0.24.1

A lightweight agent harness inspired by Pi
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141

use std::{ops::Range, sync::Arc};

use ratatui::text::Line;

use super::{is_tool_entry, render::render_entry, Entry};

#[derive(Clone, Debug, PartialEq, Eq)]
pub(super) struct CachedCodeBlock {
    pub(super) line: usize,
    pub(super) copy_columns: Range<usize>,
    pub(super) text: Arc<str>,
}

#[derive(Default)]
pub(super) struct HistoryLineCache {
    settings: Option<HistoryLineCacheSettings>,
    lines: Vec<Line<'static>>,
    entry_ranges: Vec<Range<usize>>,
    code_blocks: Vec<CachedCodeBlock>,
    dirty_from: Option<usize>,
}

#[derive(Clone, Copy, Debug, PartialEq, Eq)]
struct HistoryLineCacheSettings {
    width: usize,
    max_tool_output_lines: usize,
}

impl HistoryLineCache {
    pub(super) fn invalidate_from(&mut self, index: usize) {
        self.dirty_from = Some(self.dirty_from.map_or(index, |dirty| dirty.min(index)));
    }

    pub(super) fn line_count(
        &mut self,
        entries: &[Entry],
        width: usize,
        max_tool_output_lines: usize,
    ) -> usize {
        self.ensure_current(entries, width, max_tool_output_lines);
        self.lines.len()
    }

    pub(super) fn code_blocks(
        &mut self,
        entries: &[Entry],
        width: usize,
        max_tool_output_lines: usize,
    ) -> &[CachedCodeBlock] {
        self.ensure_current(entries, width, max_tool_output_lines);
        &self.code_blocks
    }

    pub(super) fn extend_visible_lines(
        &mut self,
        entries: &[Entry],
        width: usize,
        max_tool_output_lines: usize,
        start: usize,
        count: usize,
        target: &mut Vec<Line<'static>>,
    ) {
        if count == 0 {
            return;
        }

        self.ensure_current(entries, width, max_tool_output_lines);
        let end = start.saturating_add(count).min(self.lines.len());
        if start >= end {
            return;
        }
        target.extend(self.lines[start..end].iter().cloned());
    }

    fn ensure_current(&mut self, entries: &[Entry], width: usize, max_tool_output_lines: usize) {
        let settings = HistoryLineCacheSettings {
            width,
            max_tool_output_lines,
        };
        if self.settings != Some(settings) {
            self.settings = Some(settings);
            self.lines.clear();
            self.entry_ranges.clear();
            self.code_blocks.clear();
            self.dirty_from = Some(0);
        }

        match entries.len().cmp(&self.entry_ranges.len()) {
            std::cmp::Ordering::Less => self.invalidate_from(entries.len()),
            std::cmp::Ordering::Equal => {}
            std::cmp::Ordering::Greater => self.invalidate_from(self.entry_ranges.len()),
        }

        let Some(dirty_from) = self.dirty_from.take() else {
            return;
        };
        let rebuild_from = dirty_from.min(entries.len()).min(self.entry_ranges.len());
        let line_start = if rebuild_from == 0 {
            0
        } else {
            self.entry_ranges[rebuild_from - 1].end
        };
        self.lines.truncate(line_start);
        self.entry_ranges.truncate(rebuild_from);
        self.code_blocks.retain(|block| block.line < line_start);

        let mut previous_was_tool = rebuild_from
            .checked_sub(1)
            .and_then(|index| entries.get(index))
            .is_some_and(is_tool_entry);
        for entry in entries.iter().skip(rebuild_from) {
            let range_start = self.lines.len();
            if previous_was_tool && is_tool_entry(entry) {
                self.lines.push(Line::raw(""));
            }
            let entry_start = self.lines.len();
            let rendered = render_entry(entry, width, max_tool_output_lines);
            self.code_blocks
                .extend(
                    rendered
                        .code_blocks
                        .into_iter()
                        .map(|block| CachedCodeBlock {
                            // render_entry adds a blank row before the rendered markdown.
                            line: entry_start.saturating_add(1 + block.top_line),
                            // render_entry also pads markdown by one column on each side.
                            copy_columns: block.copy_columns.start.saturating_add(1)
                                ..block.copy_columns.end.saturating_add(1),
                            text: Arc::from(block.text),
                        }),
                );
            self.lines.extend(rendered.lines);
            self.entry_ranges.push(range_start..self.lines.len());
            previous_was_tool = is_tool_entry(entry);
        }
    }
}

#[cfg(test)]
#[path = "history_cache_tests.rs"]
mod tests;