xbp_cli/cli/

help_render.rs

//! Styled help rendering for Clap-generated usage text.

use clap::CommandFactory;
use colored::Colorize;

/// Shared help layout for subcommands (no duplicate name/version header).
pub const XBP_HELP_TEMPLATE: &str = "\
{about-with-newline}\
Usage: {usage}\n\n\
{all-args}\
{after-help}";

/// Root help layout; the renderer adds a branded banner above Clap output.
pub const XBP_ROOT_HELP_TEMPLATE: &str = "\
{about-with-newline}\
Usage: {usage}\n\n\
{all-args}\
{after-help}";

pub const XBP_ROOT_AFTER_HELP: &str = "\
Quick start:
  xbp diag
  xbp services
  xbp workers list
  xbp workers logs -f
  xbp api health

Discover:
  xbp <command> -h          Command help and examples
  xbp <command> <sub> -h    Subcommand help
  xbp --commands            Full alphabetical command tree
  xbp install               Browse installable targets";

pub const CONFIG_AFTER_HELP: &str = "\
Examples:
  xbp config
  xbp config --project
  xbp config cloudflare
  xbp config cloudflare status
  xbp config openrouter set-key
  xbp config linear select-initiative";

pub const VERSION_AFTER_HELP: &str = "\
Examples:
  xbp version
  xbp version patch
  xbp version 1.2.3
  xbp version release
  xbp version workspace check
  xbp version workspace sync --version 3.16.5 --write";

pub const DIAG_AFTER_HELP: &str = "\
Examples:
  xbp diag
  xbp diag --nginx
  xbp diag --ports 80,443
  xbp diag --codetime --cursor";

pub const NGINX_AFTER_HELP: &str = "\
Examples:
  xbp nginx list
  xbp nginx enable api.example.com
  xbp nginx disable api.example.com
  xbp nginx upstream list";

pub const COMMIT_AFTER_HELP: &str = "\
Examples:
  xbp commit
  xbp commit --dry-run
  xbp commit --push
  xbp commit --scope cli";

pub const LOGS_AFTER_HELP: &str = "\
Examples:
  xbp logs
  xbp logs my-project
  xbp logs --ssh-host bastion.example.com";

pub const PUBLISH_AFTER_HELP: &str = "\
Examples:
  xbp publish --dry-run
  xbp publish --target npm
  xbp publish --service web
  xbp publish --service api --include-prereqs
  xbp publish --allow-dirty";

pub const DOMAINS_AFTER_HELP: &str = "\
Examples:
  xbp domains list
  xbp domains check --domain example.com
  xbp domains search --query myapp --extension com";

pub const LOGIN_AFTER_HELP: &str = "\
Examples:
  xbp login
  xbp login status
  xbp login logout
  xbp whoami";

pub const SSH_AFTER_HELP: &str = "\
Examples:
  xbp ssh
  xbp ssh --host bastion.example.com
  xbp ssh --host 10.0.0.5 --command \"uptime\"";

pub const GENERATE_AFTER_HELP: &str = "\
Examples:
  xbp generate config
  xbp generate config --force
  xbp generate systemd";

pub const DONE_AFTER_HELP: &str = "\
Examples:
  xbp done
  xbp done --since \"7 days ago\"
  xbp done --output report.md";

#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum HelpScope {
    Root,
    Subcommand,
    Catalog,
    Auto,
}

pub fn emit_styled_help(raw: &str, scope: HelpScope) {
    crate::cli::ui::configure_color_output();
    let resolved_scope = match scope {
        HelpScope::Auto => detect_help_scope(raw),
        other => other,
    };

    let mut skip_about_line = None::<String>;
    let mut skip_until_usage = resolved_scope == HelpScope::Catalog;
    if resolved_scope == HelpScope::Root {
        print_root_banner(raw);
    } else if resolved_scope != HelpScope::Catalog {
        if let Some((_, tagline)) = parse_subcommand_heading(raw) {
            skip_about_line = Some(tagline);
            print_subcommand_banner(raw);
        }
    }

    let lines: Vec<&str> = raw.lines().collect();
    let mut index = 0usize;
    while index < lines.len() {
        let line = lines[index];
        let trimmed = line.trim();
        if skip_until_usage {
            if trimmed.starts_with("Usage:") {
                skip_until_usage = false;
            } else {
                index += 1;
                continue;
            }
        }
        if let Some(about) = skip_about_line.as_deref() {
            if trimmed == about {
                skip_about_line = None;
                index += 1;
                continue;
            }
        }

        if is_command_name_line(line)
            && index + 1 < lines.len()
            && is_indented_help_text(lines[index + 1], 4)
        {
            println!("{}", style_command_pair(line, lines[index + 1]));
            index += 2;
            continue;
        }

        if is_option_flags_line(line)
            && index + 1 < lines.len()
            && is_indented_help_text(lines[index + 1], 4)
        {
            println!("{}", style_option_pair(line, lines[index + 1]));
            index += 2;
            continue;
        }

        if is_option_entry(line)
            && index + 1 < lines.len()
            && is_indented_help_text(lines[index + 1], 8)
        {
            println!("{}", style_option_pair(line, lines[index + 1]));
            index += 2;
            continue;
        }

        println!("{}", style_help_line(line));
        index += 1;
    }
    println!();
}

/// Print the complete Clap command tree with styled formatting.
pub fn print_command_catalog() {
    crate::cli::ui::configure_color_output();
    println!();
    println!("{}", "xbp commands".bright_magenta().bold());
    println!("{}", "Complete command reference".bright_black());
    crate::cli::ui::divider(32);

    let help = crate::cli::commands::Cli::command()
        .render_long_help()
        .to_string();
    emit_styled_help(&help, HelpScope::Catalog);
}

pub fn emit_version_line(version: &str) {
    crate::cli::ui::configure_color_output();
    println!(
        "{} {}",
        "xbp".bright_magenta().bold(),
        version.bright_white().bold()
    );
}

pub fn is_root_help_text(raw: &str) -> bool {
    raw.lines().any(|line| {
        let trimmed = line.trim();
        trimmed == "Usage: xbp [OPTIONS] [COMMAND]"
            || trimmed == "Usage: xbp.exe [OPTIONS] [COMMAND]"
            || trimmed.starts_with("Usage: xbp [OPTIONS] [COMMAND]")
            || trimmed.starts_with("Usage: xbp.exe [OPTIONS] [COMMAND]")
    })
}

fn detect_help_scope(raw: &str) -> HelpScope {
    if is_root_help_text(raw) {
        return HelpScope::Root;
    }
    let first_line = raw.lines().next().unwrap_or_default().trim();
    if first_line.starts_with("xbp ") && first_line.chars().any(|ch| ch.is_ascii_digit()) {
        return HelpScope::Root;
    }
    HelpScope::Subcommand
}

fn print_root_banner(raw: &str) {
    let version = parse_version_line(raw).unwrap_or(env!("CARGO_PKG_VERSION"));
    println!();
    println!(
        "{}  {}",
        "XBP".bright_magenta().bold(),
        format!("v{version}").bright_white()
    );
    println!("{}", "Deploy · operate · debug · ship".bright_black());
    crate::cli::ui::divider(44);
}

fn print_subcommand_banner(raw: &str) {
    let Some((command_path, tagline)) = parse_subcommand_heading(raw) else {
        return;
    };
    println!();
    println!("{}", command_path.bright_magenta().bold());
    if !tagline.is_empty() {
        println!("{}", tagline.bright_black());
    }
    crate::cli::ui::divider(command_path.len().max(28));
}

fn parse_version_line(raw: &str) -> Option<&str> {
    let first = raw.lines().next()?.trim();
    let rest = first.strip_prefix("xbp")?.trim();
    if rest.is_empty() {
        None
    } else {
        Some(rest)
    }
}

fn parse_subcommand_heading(raw: &str) -> Option<(String, String)> {
    let about = raw
        .lines()
        .map(str::trim)
        .find(|line| !line.is_empty() && !line.starts_with("Usage:"))?;

    let usage = raw
        .lines()
        .map(str::trim)
        .find(|line| line.starts_with("Usage:"))?;
    let command_path = extract_command_path_from_usage(usage)?;

    Some((command_path, about.to_string()))
}

fn extract_command_path_from_usage(usage: &str) -> Option<String> {
    let rest = usage.split_once(':')?.1.trim();
    let path = rest.split('[').next()?.trim();
    let normalized = path.replace(".exe", "");
    if normalized.is_empty() {
        None
    } else {
        Some(normalized)
    }
}

fn style_help_line(line: &str) -> String {
    let trimmed = line.trim_start();
    if trimmed.is_empty() {
        return String::new();
    }

    if matches!(
        trimmed,
        "Commands:" | "Options:" | "Arguments:" | "Subcommands:"
    ) {
        return format!(
            "\n{} {}",
            "▸".bright_blue().bold(),
            trimmed.bright_blue().bold()
        );
    }

    if trimmed.starts_with("Usage:") {
        return style_usage_line(line);
    }

    if trimmed == "Discover:" {
        return format!(
            "\n{} {}",
            "◇".bright_green().bold(),
            trimmed.bright_green().bold()
        );
    }

    if is_example_section_header(trimmed) {
        return format!(
            "\n{} {}",
            "◇".bright_green().bold(),
            trimmed.bright_green().bold()
        );
    }

    if is_note_section_header(trimmed) {
        return format!(
            "\n{} {}",
            "◇".bright_yellow().bold(),
            trimmed.bright_yellow().bold()
        );
    }

    if is_command_entry(line) {
        return style_command_entry(line);
    }

    if is_option_flags_line(line) {
        return format!("  {}", line.trim().bright_yellow());
    }

    if is_option_entry(line) {
        return style_option_entry(line);
    }

    if is_command_name_line(line) {
        return format!("  {}", line.trim().bright_cyan().bold());
    }

    if is_indented_help_text(line, 4) || is_indented_help_text(line, 8) {
        return format!("      {}", trimmed.bright_black());
    }

    if is_example_command_line(trimmed) {
        return format!("  {}", highlight_inline_flags(trimmed).dimmed());
    }

    if trimmed.starts_with("Run `") || trimmed.starts_with("Use `") || trimmed.starts_with("Pass `")
    {
        return trimmed.bright_black().to_string();
    }

    line.to_string()
}

fn style_usage_line(line: &str) -> String {
    let (prefix, rest) = line.split_once(':').unwrap_or((line, ""));
    format!(
        "{} {}",
        format!("{prefix}:").bright_cyan().bold(),
        highlight_inline_flags(rest.trim()).bright_white()
    )
}

fn is_example_section_header(line: &str) -> bool {
    matches!(
        line,
        "Examples:"
            | "Quick start:"
            | "Discover:"
            | "Available targets:"
            | "List installable targets:"
    ) || line.starts_with("Quick start")
        || line.starts_with("List installable")
}

fn is_note_section_header(line: &str) -> bool {
    line == "Notes:"
        || line.starts_with("Tip:")
        || line.starts_with("More info:")
        || line.starts_with("Hint:")
}

fn is_command_entry(line: &str) -> bool {
    if !line.starts_with("  ") || line.starts_with("    ") {
        return false;
    }
    let trimmed = line.trim_start();
    let Some((name, _)) = trimmed.split_once("  ") else {
        return false;
    };
    !name.starts_with('-') && !name.contains('<') && name.len() <= 24
}

fn style_command_entry(line: &str) -> String {
    let trimmed = line.trim_start();
    let mut parts = trimmed.splitn(2, "  ");
    let name = parts.next().unwrap_or_default();
    let description = parts.next().unwrap_or_default().trim();
    let alias = extract_alias_suffix(description);
    let base_description = description
        .split_once('[')
        .map(|(left, _)| left.trim())
        .unwrap_or(description);

    let name = name.bright_cyan().bold();
    if alias.is_empty() {
        format!("  {name:<22} {}", base_description.bright_black())
    } else {
        format!(
            "  {name:<22} {} {}",
            base_description.bright_black(),
            alias.bright_black()
        )
    }
}

fn extract_alias_suffix(description: &str) -> String {
    let Some(start) = description.find('[') else {
        return String::new();
    };
    description[start..].to_string()
}

fn is_option_flags_line(line: &str) -> bool {
    let trimmed = line.trim_start();
    line.starts_with("  ")
        && !line.starts_with("    ")
        && (trimmed.starts_with("--") || trimmed.starts_with("-"))
}

fn is_option_entry(line: &str) -> bool {
    let trimmed = line.trim_start();
    line.starts_with("      ")
        && (trimmed.starts_with("--") || trimmed.starts_with("-"))
        && !trimmed.starts_with("Usage:")
}

fn is_command_name_line(line: &str) -> bool {
    if !line.starts_with("  ") || line.starts_with("    ") {
        return false;
    }
    let trimmed = line.trim();
    !trimmed.is_empty()
        && !trimmed.ends_with(':')
        && !trimmed.starts_with('-')
        && !trimmed.contains(' ')
        && trimmed.len() <= 24
}

fn is_indented_help_text(line: &str, min_spaces: usize) -> bool {
    let leading = line.chars().take_while(|ch| *ch == ' ').count();
    leading >= min_spaces && !line.trim_start().starts_with('-') && !line.trim().is_empty()
}

fn style_command_pair(name_line: &str, description_line: &str) -> String {
    let name = name_line.trim().bright_cyan().bold();
    let description = description_line.trim();
    let alias = extract_alias_suffix(description);
    let base_description = description
        .split_once('[')
        .map(|(left, _)| left.trim())
        .unwrap_or(description);

    if alias.is_empty() {
        format!("  {name:<22} {}", base_description.bright_black())
    } else {
        format!(
            "  {name:<22} {} {}",
            base_description.bright_black(),
            alias.bright_black()
        )
    }
}

fn style_option_pair(flags_line: &str, description_line: &str) -> String {
    let flags = flags_line.trim();
    let styled_flags = flags
        .split(", ")
        .map(|flag| flag.bright_yellow().to_string())
        .collect::<Vec<_>>()
        .join(", ");
    format!(
        "      {styled_flags:<28} {}",
        description_line.trim().bright_black()
    )
}

fn style_option_entry(line: &str) -> String {
    let trimmed = line.trim_start();
    let mut parts = trimmed.splitn(2, "  ");
    let flags = parts.next().unwrap_or_default();
    let description = parts.next().unwrap_or_default().trim();

    let styled_flags = flags
        .split(", ")
        .map(|flag| flag.bright_yellow().to_string())
        .collect::<Vec<_>>()
        .join(", ");

    if description.is_empty() {
        format!("      {styled_flags}")
    } else {
        format!("      {styled_flags:<28} {}", description.bright_black())
    }
}

fn is_example_command_line(line: &str) -> bool {
    line.starts_with("xbp ") || line.starts_with("cargo ") || line.starts_with("git ")
}

fn highlight_inline_flags(text: &str) -> String {
    let mut output = String::new();
    let mut current = String::new();
    let mut chars = text.chars().peekable();

    while let Some(ch) = chars.next() {
        if ch == '-' && matches!(chars.peek(), Some('-' | 'f' | 'h' | 'l' | 'p' | 'v' | 'n')) {
            if !current.is_empty() {
                output.push_str(&current);
                current.clear();
            }
            let mut flag = String::from('-');
            if chars.peek() == Some(&'-') {
                flag.push(chars.next().expect("dash"));
            }
            while let Some(&next) = chars.peek() {
                if next.is_ascii_alphanumeric() || next == '-' {
                    flag.push(chars.next().expect("flag char"));
                } else {
                    break;
                }
            }
            output.push_str(&flag.bright_yellow().to_string());
            continue;
        }

        if ch == '<' {
            if !current.is_empty() {
                output.push_str(&current);
                current.clear();
            }
            let mut placeholder = String::from('<');
            for next in chars.by_ref() {
                placeholder.push(next);
                if next == '>' {
                    break;
                }
            }
            output.push_str(&placeholder.bright_green().to_string());
            continue;
        }

        current.push(ch);
    }

    if !current.is_empty() {
        output.push_str(&current);
    }
    output
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn detects_root_help_scope() {
        let raw = "xbp 10.30.3\n\nAbout\nUsage: xbp [OPTIONS] [COMMAND]";
        assert_eq!(detect_help_scope(raw), HelpScope::Root);
    }

    #[test]
    fn workers_help_is_not_root() {
        let raw = "Manage workers\nUsage: xbp.exe workers [OPTIONS] <COMMAND>";
        assert!(!is_root_help_text(raw));
    }

    #[test]
    fn styles_usage_line_with_flags() {
        let styled = style_help_line("Usage: xbp workers logs [OPTIONS]");
        assert!(styled.contains("Usage:"));
        assert!(styled.contains("workers"));
    }

    #[test]
    fn styles_command_entry_line() {
        let styled = style_help_line("  list      List workers [aliases: ls]");
        assert!(styled.contains("list"));
    }

    #[test]
    fn catalog_scope_skips_duplicate_about() {
        let raw = "Deploy services\nUsage: xbp [OPTIONS] [COMMAND]\n\nCommands:\n  diag\n      Run diagnostics";
        emit_styled_help(raw, HelpScope::Catalog);
    }
}