1use std::cell::RefCell;
2use std::rc::Rc;
3use std::sync::atomic::AtomicBool;
4use std::sync::Arc;
5
6use anyhow::{anyhow, bail, Context, Result};
7use assistant_slash_command::{SlashCommand, SlashCommandOutput, SlashCommandOutputSection};
8use futures::AsyncReadExt;
9use gpui::{AppContext, Task, WeakView};
10use html_to_markdown::{convert_html_to_markdown, markdown, TagHandler};
11use http::{AsyncBody, HttpClient, HttpClientWithUrl};
12use language::LspAdapterDelegate;
13use ui::prelude::*;
14use workspace::Workspace;
15
16#[derive(Debug, PartialEq, Eq, PartialOrd, Ord, Hash, Clone, Copy)]
17enum ContentType {
18 Html,
19 Plaintext,
20 Json,
21}
22
23pub(crate) struct FetchSlashCommand;
24
25impl FetchSlashCommand {
26 async fn build_message(http_client: Arc<HttpClientWithUrl>, url: &str) -> Result<String> {
27 let mut url = url.to_owned();
28 if !url.starts_with("https://") {
29 url = format!("https://{url}");
30 }
31
32 let mut response = http_client.get(&url, AsyncBody::default(), true).await?;
33
34 let mut body = Vec::new();
35 response
36 .body_mut()
37 .read_to_end(&mut body)
38 .await
39 .context("error reading response body")?;
40
41 if response.status().is_client_error() {
42 let text = String::from_utf8_lossy(body.as_slice());
43 bail!(
44 "status error {}, response: {text:?}",
45 response.status().as_u16()
46 );
47 }
48
49 let Some(content_type) = response.headers().get("content-type") else {
50 bail!("missing Content-Type header");
51 };
52 let content_type = content_type
53 .to_str()
54 .context("invalid Content-Type header")?;
55 let content_type = match content_type {
56 "text/html" => ContentType::Html,
57 "text/plain" => ContentType::Plaintext,
58 "application/json" => ContentType::Json,
59 _ => ContentType::Html,
60 };
61
62 match content_type {
63 ContentType::Html => {
64 let mut handlers: Vec<TagHandler> = vec![
65 Rc::new(RefCell::new(markdown::WebpageChromeRemover)),
66 Rc::new(RefCell::new(markdown::ParagraphHandler)),
67 Rc::new(RefCell::new(markdown::HeadingHandler)),
68 Rc::new(RefCell::new(markdown::ListHandler)),
69 Rc::new(RefCell::new(markdown::TableHandler::new())),
70 Rc::new(RefCell::new(markdown::StyledTextHandler)),
71 ];
72 if url.contains("wikipedia.org") {
73 use html_to_markdown::structure::wikipedia;
74
75 handlers.push(Rc::new(RefCell::new(wikipedia::WikipediaChromeRemover)));
76 handlers.push(Rc::new(RefCell::new(wikipedia::WikipediaInfoboxHandler)));
77 handlers.push(Rc::new(
78 RefCell::new(wikipedia::WikipediaCodeHandler::new()),
79 ));
80 } else {
81 handlers.push(Rc::new(RefCell::new(markdown::CodeHandler)));
82 }
83
84 convert_html_to_markdown(&body[..], &mut handlers)
85 }
86 ContentType::Plaintext => Ok(std::str::from_utf8(&body)?.to_owned()),
87 ContentType::Json => {
88 let json: serde_json::Value = serde_json::from_slice(&body)?;
89
90 Ok(format!(
91 "```json\n{}\n```",
92 serde_json::to_string_pretty(&json)?
93 ))
94 }
95 }
96 }
97}
98
99impl SlashCommand for FetchSlashCommand {
100 fn name(&self) -> String {
101 "fetch".into()
102 }
103
104 fn description(&self) -> String {
105 "insert URL contents".into()
106 }
107
108 fn menu_text(&self) -> String {
109 "Insert fetched URL contents".into()
110 }
111
112 fn requires_argument(&self) -> bool {
113 true
114 }
115
116 fn complete_argument(
117 self: Arc<Self>,
118 _query: String,
119 _cancel: Arc<AtomicBool>,
120 _workspace: Option<WeakView<Workspace>>,
121 _cx: &mut AppContext,
122 ) -> Task<Result<Vec<String>>> {
123 Task::ready(Ok(Vec::new()))
124 }
125
126 fn run(
127 self: Arc<Self>,
128 argument: Option<&str>,
129 workspace: WeakView<Workspace>,
130 _delegate: Arc<dyn LspAdapterDelegate>,
131 cx: &mut WindowContext,
132 ) -> Task<Result<SlashCommandOutput>> {
133 let Some(argument) = argument else {
134 return Task::ready(Err(anyhow!("missing URL")));
135 };
136 let Some(workspace) = workspace.upgrade() else {
137 return Task::ready(Err(anyhow!("workspace was dropped")));
138 };
139
140 let http_client = workspace.read(cx).client().http_client();
141 let url = argument.to_string();
142
143 let text = cx.background_executor().spawn({
144 let url = url.clone();
145 async move { Self::build_message(http_client, &url).await }
146 });
147
148 let url = SharedString::from(url);
149 cx.foreground_executor().spawn(async move {
150 let text = text.await?;
151 let range = 0..text.len();
152 Ok(SlashCommandOutput {
153 text,
154 sections: vec![SlashCommandOutputSection {
155 range,
156 icon: IconName::AtSign,
157 label: format!("fetch {}", url).into(),
158 }],
159 run_commands_in_text: false,
160 })
161 })
162 }
163}