sigoden/aichat · error · anyhow::Error

Invalid wrap value

Error message

Invalid wrap value

What it means

Error path in MarkdownRender::init: the configured wrap option value is compared against the actual terminal width, and when the wrap specification cannot be reconciled with the terminal size (invalid or out-of-range value), initialization fails with 'Invalid wrap value'. The input at fault is the options.wrap string.

Solutions

1. Set wrap to a plain number of columns, e.g. 80
2. Use wrap = "auto" to follow terminal width
3. Ensure the value fits in u16 (0–65535)

Example fix

// before (config)
wrap = "80ch"
// after
wrap = 80

fn valid_wrap(v: &str) -> bool {
    v == "auto" || v.parse::<u16>().is_ok()
}

match init_renderer() {
    Err(e) if e.to_string().contains("Invalid wrap value") => {
        eprintln!("wrap must be 'auto' or a number <= 65535; falling back to auto");
        init_with_wrap_auto()
    }
    other => other,
}

When it happens

Trigger: Setting wrap to a non-numeric string (other than 'auto') in config or the --wrap flag while stdout is a terminal with detectable columns.

Common situations: Config containing wrap = "80ch" or "wide"; typo like "8o"; passing a value larger than u16 range (e.g. 99999).

Understand the failure class

Background: "Invalid value" and "allowed values are" config errors: what your library rejected and how to fix it — this error's family across 41 libraries.

Related errors

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AI-assisted analysis of sigoden/aichat@82976d349a (2026-09-09). Data as JSON: /api/errors/8412b2bef386351a. Report an issue: GitHub.

Appendix: source

Thrown at src/render/markdown.rs:53

        let syntax_set: SyntaxSet =
            decode_bin(SYNTAXES).with_context(|| "MarkdownRender: invalid syntaxes binary")?;

        let code_color = options
            .theme
            .as_ref()
            .map(|theme| get_code_color(theme, options.truecolor));
        let md_syntax = syntax_set.find_syntax_by_extension("md").unwrap().clone();
        let line_type = LineType::Normal;
        let wrap_width = match options.wrap.as_deref() {
            None => None,
            Some(value) => match terminal::size() {
                Ok((columns, _)) => {
                    if value == "auto" {
                        Some(columns)
                    } else {
                        let value = value
                            .parse::<u16>()
                            .map_err(|_| anyhow!("Invalid wrap value"))?;
                        Some(columns.min(value))
                    }
                }
                Err(_) => None,
            },
        };
        Ok(Self {
            syntax_set,
            code_color,
            md_syntax,
            code_syntax: None,
            prev_line_type: line_type,
            wrap_width,
            options,
        })
    }

    pub fn render(&mut self, text: &str) -> String {

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