Add serialized versions of themes (#6885)

This PR adds serialized versions of each of the themes that currently
ship with Zed.

In a future PR we'll be looking to make these the canonical
representations of the built-in themes.

Note that we're intentionally repurposing the `theme_importer` to do
this, so that crate is a bit rough-and-ready at the moment.

Release Notes:

- N/A

crates/theme/src/schema.rs

@@ -26,10 +26,33 @@ fn try_parse_color(color: &str) -> Result<Hsla> {
     Ok(hsla)
 }
 
+#[derive(Debug, PartialEq, Clone, Copy, Serialize, Deserialize, JsonSchema)]
+#[serde(rename_all = "snake_case")]
+pub enum AppearanceContent {
+    Light,
+    Dark,
+}
+
+/// The content of a serialized theme family.
+#[derive(Debug, Clone, Serialize, Deserialize, JsonSchema)]
+pub struct ThemeFamilyContent {
+    pub name: String,
+    pub author: String,
+    pub themes: Vec<ThemeContent>,
+}
+
+/// The content of a serialized theme.
+#[derive(Debug, Clone, Serialize, Deserialize, JsonSchema)]
+pub struct ThemeContent {
+    pub name: String,
+    pub appearance: AppearanceContent,
+    pub style: ThemeStyleContent,
+}
+
 /// The content of a serialized theme.
 #[derive(Debug, Clone, Default, Serialize, Deserialize, JsonSchema)]
 #[serde(default)]
-pub struct ThemeContent {
+pub struct ThemeStyleContent {
     #[serde(flatten, default)]
     pub colors: ThemeColorsContent,
 
@@ -41,7 +64,7 @@ pub struct ThemeContent {
     pub syntax: IndexMap<String, HighlightStyleContent>,
 }
 
-impl ThemeContent {
+impl ThemeStyleContent {
     /// Returns a [`ThemeColorsRefinement`] based on the colors in the [`ThemeContent`].
     #[inline(always)]
     pub fn theme_colors_refinement(&self) -> ThemeColorsRefinement {
@@ -230,7 +253,7 @@ pub struct ThemeColorsContent {
     /// Fill Color. Used for the accent fill color of an icon.
     ///
     /// This might be used to show when a toggleable icon button is selected.
-    #[serde(rename = "con.accent")]
+    #[serde(rename = "icon.accent")]
     pub icon_accent: Option<String>,
 
     #[serde(rename = "status_bar.background")]

crates/theme/src/settings.rs

@@ -1,5 +1,5 @@
 use crate::one_themes::one_dark;
-use crate::{SyntaxTheme, Theme, ThemeContent, ThemeRegistry};
+use crate::{SyntaxTheme, Theme, ThemeRegistry, ThemeStyleContent};
 use anyhow::Result;
 use gpui::{
     px, AppContext, Font, FontFeatures, FontStyle, FontWeight, Pixels, Subscription, ViewContext,
@@ -27,7 +27,7 @@ pub struct ThemeSettings {
     pub buffer_font_size: Pixels,
     pub buffer_line_height: BufferLineHeight,
     pub active_theme: Arc<Theme>,
-    pub theme_overrides: Option<ThemeContent>,
+    pub theme_overrides: Option<ThemeStyleContent>,
 }
 
 #[derive(Default)]
@@ -56,7 +56,7 @@ pub struct ThemeSettingsContent {
     ///
     /// These values will override the ones on the current theme specified in `theme`.
     #[serde(rename = "experimental.theme_overrides", default)]
-    pub theme_overrides: Option<ThemeContent>,
+    pub theme_overrides: Option<ThemeStyleContent>,
 }
 
 #[derive(Clone, Copy, Debug, Serialize, Deserialize, PartialEq, JsonSchema, Default)]

crates/theme/src/themes/mod.rs

@@ -23,7 +23,7 @@ pub use summercamp::*;
 
 use crate::UserThemeFamily;
 
-pub(crate) fn all_user_themes() -> Vec<UserThemeFamily> {
+pub fn all_user_themes() -> Vec<UserThemeFamily> {
     vec![
         andromeda(),
         atelier(),