use std::cell::RefCell;use std::rc::Rc;use std::sync::Arc; use crate::schema::json_schema_for;use anyhow::{Context as _, Result, anyhow, bail};use assistant_tool::{ActionLog, Tool, ToolResult};use futures::AsyncReadExt as _;use gpui::{AnyWindowHandle, App, AppContext as _, Entity, Task};use html_to_markdown::{TagHandler, convert_html_to_markdown, markdown};use http_client::{AsyncBody, HttpClientWithUrl};use language_model::{LanguageModel, LanguageModelRequest, LanguageModelToolSchemaFormat};use project::Project;use schemars::JsonSchema;use serde::{Deserialize, Serialize};use ui::IconName;use util::markdown::MarkdownEscaped; #[derive(Debug, PartialEq, Eq, PartialOrd, Ord, Hash, Clone, Copy)]enum ContentType {    Html,    Plaintext,    Json,} #[derive(Debug, Serialize, Deserialize, JsonSchema)]pub struct FetchToolInput {    /// The URL to fetch.    url: String,} pub struct FetchTool {    http_client: Arc<HttpClientWithUrl>,} impl FetchTool {    pub fn new(http_client: Arc<HttpClientWithUrl>) -> Self {        Self { http_client }    }     async fn build_message(http_client: Arc<HttpClientWithUrl>, url: &str) -> Result<String> {        let mut url = url.to_owned();        if !url.starts_with("https://") && !url.starts_with("http://") {            url = format!("https://{url}");        }         let mut response = http_client.get(&url, AsyncBody::default(), true).await?;         let mut body = Vec::new();        response            .body_mut()            .read_to_end(&mut body)            .await            .context("error reading response body")?;         if response.status().is_client_error() {            let text = String::from_utf8_lossy(body.as_slice());            bail!(                "status error {}, response: {text:?}",                response.status().as_u16()            );        }         let Some(content_type) = response.headers().get("content-type") else {            bail!("missing Content-Type header");        };        let content_type = content_type            .to_str()            .context("invalid Content-Type header")?;        let content_type = match content_type {            "text/html" => ContentType::Html,            "text/plain" => ContentType::Plaintext,            "application/json" => ContentType::Json,            _ => ContentType::Html,        };         match content_type {            ContentType::Html => {                let mut handlers: Vec<TagHandler> = vec![                    Rc::new(RefCell::new(markdown::WebpageChromeRemover)),                    Rc::new(RefCell::new(markdown::ParagraphHandler)),                    Rc::new(RefCell::new(markdown::HeadingHandler)),                    Rc::new(RefCell::new(markdown::ListHandler)),                    Rc::new(RefCell::new(markdown::TableHandler::new())),                    Rc::new(RefCell::new(markdown::StyledTextHandler)),                ];                if url.contains("wikipedia.org") {                    use html_to_markdown::structure::wikipedia;                     handlers.push(Rc::new(RefCell::new(wikipedia::WikipediaChromeRemover)));                    handlers.push(Rc::new(RefCell::new(wikipedia::WikipediaInfoboxHandler)));                    handlers.push(Rc::new(                        RefCell::new(wikipedia::WikipediaCodeHandler::new()),                    ));                } else {                    handlers.push(Rc::new(RefCell::new(markdown::CodeHandler)));                }                 convert_html_to_markdown(&body[..], &mut handlers)            }            ContentType::Plaintext => Ok(std::str::from_utf8(&body)?.to_owned()),            ContentType::Json => {                let json: serde_json::Value = serde_json::from_slice(&body)?;                 Ok(format!(                    "```json\n{}\n```",                    serde_json::to_string_pretty(&json)?                ))            }        }    }} impl Tool for FetchTool {    fn name(&self) -> String {        "fetch".to_string()    }     fn needs_confirmation(&self, _: &serde_json::Value, _: &App) -> bool {        true    }     fn description(&self) -> String {        include_str!("./fetch_tool/description.md").to_string()    }     fn icon(&self) -> IconName {        IconName::Globe    }     fn input_schema(&self, format: LanguageModelToolSchemaFormat) -> Result<serde_json::Value> {        json_schema_for::<FetchToolInput>(format)    }     fn ui_text(&self, input: &serde_json::Value) -> String {        match serde_json::from_value::<FetchToolInput>(input.clone()) {            Ok(input) => format!("Fetch {}", MarkdownEscaped(&input.url)),            Err(_) => "Fetch URL".to_string(),        }    }     fn run(        self: Arc<Self>,        input: serde_json::Value,        _request: Arc<LanguageModelRequest>,        _project: Entity<Project>,        _action_log: Entity<ActionLog>,        _model: Arc<dyn LanguageModel>,        _window: Option<AnyWindowHandle>,        cx: &mut App,    ) -> ToolResult {        let input = match serde_json::from_value::<FetchToolInput>(input) {            Ok(input) => input,            Err(err) => return Task::ready(Err(anyhow!(err))).into(),        };         let text = cx.background_spawn({            let http_client = self.http_client.clone();            let url = input.url.clone();            async move { Self::build_message(http_client, &url).await }        });         cx.foreground_executor()            .spawn(async move {                let text = text.await?;                if text.trim().is_empty() {                    bail!("no textual content found");                }                 Ok(text.into())            })            .into()    }}