a3s 0.10.0

a3s — A3S coding agent CLI; `a3s code` launches the interactive TUI
Documentation 
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//! Bounded, terminal-safe text used by cross-process agent status.

use std::ffi::OsStr;
use std::path::Path;

use super::MAX_WORKSPACE_CHARS;

pub(super) fn workspace_basename(workspace: &str) -> String {
    let basename = Path::new(workspace)
        .file_name()
        .and_then(OsStr::to_str)
        .unwrap_or("workspace");
    sanitize_nonempty(basename, MAX_WORKSPACE_CHARS, "workspace")
}

pub(super) fn sanitize_optional(value: Option<&str>, max_chars: usize) -> Option<String> {
    value
        .map(|value| sanitize_display_text(value, max_chars))
        .filter(|value| !value.is_empty())
}

pub(super) fn sanitize_nonempty(value: &str, max_chars: usize, fallback: &str) -> String {
    let value = sanitize_display_text(value, max_chars);
    if value.is_empty() {
        fallback.to_string()
    } else {
        value
    }
}

/// Convert untrusted terminal-facing text into a bounded, single-line label.
///
/// This strips complete ANSI/ECMA-48 control strings, C0/C1 controls, and
/// bidirectional formatting controls while preserving ordinary Unicode text.
pub(crate) fn sanitize_display_text(value: &str, max_chars: usize) -> String {
    #[derive(Clone, Copy)]
    enum State {
        Text,
        Escape,
        EscapeIntermediate,
        Csi,
        ControlString,
        ControlStringEscape,
    }

    let mut state = State::Text;
    let mut output = String::new();
    let mut output_chars = 0usize;
    let mut pending_space = false;

    for character in value.chars() {
        match state {
            State::Escape => {
                state = match character {
                    '[' => State::Csi,
                    ']' | 'P' | 'X' | '^' | '_' => State::ControlString,
                    '\u{20}'..='\u{2f}' => State::EscapeIntermediate,
                    _ => State::Text,
                };
                continue;
            }
            State::EscapeIntermediate => {
                if ('\u{30}'..='\u{7e}').contains(&character) {
                    state = State::Text;
                }
                continue;
            }
            State::Csi => {
                if ('\u{40}'..='\u{7e}').contains(&character) {
                    state = State::Text;
                }
                continue;
            }
            State::ControlString => {
                state = match character {
                    '\u{7}' | '\u{9c}' => State::Text,
                    '\u{1b}' => State::ControlStringEscape,
                    _ => State::ControlString,
                };
                continue;
            }
            State::ControlStringEscape => {
                state = if character == '\\' {
                    State::Text
                } else if character == '\u{1b}' {
                    State::ControlStringEscape
                } else {
                    State::ControlString
                };
                continue;
            }
            State::Text => {}
        }

        state = match character {
            '\u{1b}' => State::Escape,
            '\u{9b}' => State::Csi,
            '\u{90}' | '\u{98}' | '\u{9d}' | '\u{9e}' | '\u{9f}' => State::ControlString,
            _ => State::Text,
        };
        if !matches!(state, State::Text) {
            continue;
        }

        let bidi_control = matches!(
            character,
            '\u{061c}'
                | '\u{200e}'
                | '\u{200f}'
                | '\u{202a}'..='\u{202e}'
                | '\u{2066}'..='\u{206f}'
        );
        if character.is_control() || bidi_control || character.is_whitespace() {
            pending_space |= !output.is_empty();
            continue;
        }
        if output_chars >= max_chars {
            break;
        }
        if pending_space && output_chars + 1 < max_chars {
            output.push(' ');
            output_chars += 1;
        }
        pending_space = false;
        if output_chars < max_chars {
            output.push(character);
            output_chars += 1;
        }
    }
    output
}