1use crate::{Theme, ThemeMeta};
 2use anyhow::{Context, Result};
 3use gpui::{fonts, AssetSource, FontCache};
 4use parking_lot::Mutex;
 5use serde::Deserialize;
 6use serde_json::Value;
 7use std::{
 8    collections::HashMap,
 9    sync::{
10        atomic::{AtomicUsize, Ordering::SeqCst},
11        Arc,
12    },
13};
14
15pub struct ThemeRegistry {
16    assets: Box<dyn AssetSource>,
17    themes: Mutex<HashMap<String, Arc<Theme>>>,
18    theme_data: Mutex<HashMap<String, Arc<Value>>>,
19    font_cache: Arc<FontCache>,
20    next_theme_id: AtomicUsize,
21}
22
23impl ThemeRegistry {
24    pub fn new(source: impl AssetSource, font_cache: Arc<FontCache>) -> Arc<Self> {
25        Arc::new(Self {
26            assets: Box::new(source),
27            themes: Default::default(),
28            theme_data: Default::default(),
29            next_theme_id: Default::default(),
30            font_cache,
31        })
32    }
33
34    pub fn list(&self, staff: bool) -> impl Iterator<Item = ThemeMeta> + '_ {
35        let mut dirs = self.assets.list("themes/");
36
37        if !staff {
38            dirs = dirs
39                .into_iter()
40                .filter(|path| !path.starts_with("themes/staff"))
41                .collect()
42        }
43
44        dirs.into_iter().filter_map(|path| {
45            let filename = path.strip_prefix("themes/")?;
46            let theme_name = filename.strip_suffix(".json")?;
47            self.get(theme_name).ok().map(|theme| theme.meta.clone())
48        })
49    }
50
51    pub fn clear(&self) {
52        self.theme_data.lock().clear();
53        self.themes.lock().clear();
54    }
55
56    pub fn get(&self, name: &str) -> Result<Arc<Theme>> {
57        if let Some(theme) = self.themes.lock().get(name) {
58            return Ok(theme.clone());
59        }
60
61        let asset_path = format!("themes/{}.json", name);
62        let theme_json = self
63            .assets
64            .load(&asset_path)
65            .with_context(|| format!("failed to load theme file {}", asset_path))?;
66
67        // Allocate into the heap directly, the Theme struct is too large to fit in the stack.
68        let mut theme = fonts::with_font_cache(self.font_cache.clone(), || {
69            let mut theme = Box::new(Theme::default());
70            let mut deserializer = serde_json::Deserializer::from_slice(&theme_json);
71            let result = Theme::deserialize_in_place(&mut deserializer, &mut theme);
72            result.map(|_| theme)
73        })?;
74
75        // Reset name to be the file path, so that we can use it to access the stored themes
76        theme.meta.name = name.into();
77        theme.meta.id = self.next_theme_id.fetch_add(1, SeqCst);
78        let theme: Arc<Theme> = theme.into();
79        self.themes.lock().insert(name.to_string(), theme.clone());
80        Ok(theme)
81    }
82}