Define base keymap setting in welcome crate

crates/welcome/src/base_keymap_setting.rs

@@ -0,0 +1,65 @@
+use schemars::JsonSchema;
+use serde::{Deserialize, Serialize};
+use settings::Setting;
+
+#[derive(Copy, Clone, Debug, Serialize, Deserialize, JsonSchema, PartialEq, Eq, Default)]
+pub enum BaseKeymap {
+    #[default]
+    VSCode,
+    JetBrains,
+    SublimeText,
+    Atom,
+    TextMate,
+}
+
+impl BaseKeymap {
+    pub const OPTIONS: [(&'static str, Self); 5] = [
+        ("VSCode (Default)", Self::VSCode),
+        ("Atom", Self::Atom),
+        ("JetBrains", Self::JetBrains),
+        ("Sublime Text", Self::SublimeText),
+        ("TextMate", Self::TextMate),
+    ];
+
+    pub fn asset_path(&self) -> Option<&'static str> {
+        match self {
+            BaseKeymap::JetBrains => Some("keymaps/jetbrains.json"),
+            BaseKeymap::SublimeText => Some("keymaps/sublime_text.json"),
+            BaseKeymap::Atom => Some("keymaps/atom.json"),
+            BaseKeymap::TextMate => Some("keymaps/textmate.json"),
+            BaseKeymap::VSCode => None,
+        }
+    }
+
+    pub fn names() -> impl Iterator<Item = &'static str> {
+        Self::OPTIONS.iter().map(|(name, _)| *name)
+    }
+
+    pub fn from_names(option: &str) -> BaseKeymap {
+        Self::OPTIONS
+            .iter()
+            .copied()
+            .find_map(|(name, value)| (name == option).then(|| value))
+            .unwrap_or_default()
+    }
+}
+
+impl Setting for BaseKeymap {
+    const KEY: Option<&'static str> = Some("base_keymap");
+
+    type FileContent = Option<Self>;
+
+    fn load(
+        default_value: &Self::FileContent,
+        user_values: &[&Self::FileContent],
+        _: &gpui::AppContext,
+    ) -> anyhow::Result<Self>
+    where
+        Self: Sized,
+    {
+        Ok(user_values
+            .first()
+            .and_then(|v| **v)
+            .unwrap_or(default_value.unwrap()))
+    }
+}