zeph-commands 0.19.0

Slash command registry, handler trait, and channel sink abstraction for Zeph
Documentation 
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// SPDX-FileCopyrightText: 2026 Andrei G <bug-ops>
// SPDX-License-Identifier: MIT OR Apache-2.0

//! `/help` command handler.

use std::fmt::Write as _;
use std::future::Future;
use std::pin::Pin;

use crate::context::CommandContext;
use crate::{CommandError, CommandHandler, CommandOutput, SlashCategory};

/// Display all available slash commands grouped by category.
pub struct HelpCommand;

impl CommandHandler<CommandContext<'_>> for HelpCommand {
    fn name(&self) -> &'static str {
        "/help"
    }

    fn description(&self) -> &'static str {
        "Show this help message"
    }

    fn category(&self) -> SlashCategory {
        SlashCategory::Debugging
    }

    fn handle<'a>(
        &'a self,
        _ctx: &'a mut CommandContext<'_>,
        _args: &'a str,
    ) -> Pin<Box<dyn Future<Output = Result<CommandOutput, CommandError>> + Send + 'a>> {
        Box::pin(async move {
            let mut out = String::from("Slash commands:\n\n");

            let categories = [
                SlashCategory::Session,
                SlashCategory::Configuration,
                SlashCategory::Memory,
                SlashCategory::Skills,
                SlashCategory::Planning,
                SlashCategory::Integration,
                SlashCategory::Debugging,
                SlashCategory::Advanced,
            ];

            for cat in &categories {
                let entries: Vec<_> = crate::COMMANDS
                    .iter()
                    .filter(|c| &c.category == cat)
                    .collect();
                if entries.is_empty() {
                    continue;
                }
                let _ = writeln!(out, "{}:", cat.as_str());
                for cmd in entries {
                    if cmd.args.is_empty() {
                        let _ = write!(out, "  {}", cmd.name);
                    } else {
                        let _ = write!(out, "  {} {}", cmd.name, cmd.args);
                    }
                    let _ = write!(out, "  — {}", cmd.description);
                    if let Some(feat) = cmd.feature_gate {
                        let _ = write!(out, " [requires: {feat}]");
                    }
                    let _ = writeln!(out);
                }
                let _ = writeln!(out);
            }

            Ok(CommandOutput::Message(out.trim_end().to_owned()))
        })
    }
}