poise 0.7.0

A Discord bot framework for serenity
Documentation 
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//! Application command permissions calculation
use crate::{serenity::Permissions, serenity_prelude as serenity};

use super::PermissionsInfo;

/// Checks if a ChannelType is equal to a known thread type.
fn is_thread(kind: serenity::ChannelType) -> bool {
    matches!(
        kind,
        serenity::ChannelType::NewsThread
            | serenity::ChannelType::PrivateThread
            | serenity::ChannelType::PublicThread
    )
}

/// Gets the permissions of the ctx author and the bot.
pub(super) fn get_author_and_bot_permissions(
    interaction: &serenity::CommandInteraction,
) -> PermissionsInfo {
    let err = "member is Some if interaction is in guild";
    let author_member = interaction.member.as_ref().expect(err);

    let err = "should always be some as inside interaction";
    let mut author_permissions = author_member.permissions.expect(err);

    let err = "should always be some according to discord docs";
    let mut bot_permissions = interaction.app_permissions.expect(err);

    let channel = interaction.channel.as_ref();
    if channel.is_some_and(|c| is_thread(c.kind)) {
        author_permissions.set(
            Permissions::SEND_MESSAGES,
            author_permissions.send_messages_in_threads(),
        );
        bot_permissions.set(
            Permissions::SEND_MESSAGES,
            bot_permissions.send_messages_in_threads(),
        );
    }

    PermissionsInfo {
        author_permissions: Some(author_permissions),
        bot_permissions: Some(bot_permissions),
    }
}