refactor(core): rename system context to instructions (#35583)

packages/core/src/instructions/builtins.ts

@@ -0,0 +1,48 @@
+export * as InstructionBuiltIns from "./builtins"
+
+import { makeLocationNode } from "../effect/app-node"
+import { Context, DateTime, Effect, Layer, Schema } from "effect"
+import { Location } from "../location"
+import { Instructions } from "./index"
+
+export interface Interface {
+  readonly load: () => Effect.Effect<Instructions.Instructions>
+}
+
+export class Service extends Context.Service<Service, Interface>()("@opencode/v2/InstructionBuiltIns") {}
+
+const layer = Layer.effect(
+  Service,
+  Effect.gen(function* () {
+    const location = yield* Location.Service
+    const environment = [
+      "<env>",
+      `  Working directory: ${location.directory}`,
+      `  Workspace root folder: ${location.project.directory}`,
+      `  Is directory a git repo: ${location.vcs?.type === "git" ? "yes" : "no"}`,
+      `  Platform: ${process.platform}`,
+      "</env>",
+    ].join("\n")
+    const instructions = Instructions.combine([
+      Instructions.make({
+        key: Instructions.Key.make("core/environment"),
+        codec: Schema.toCodecJson(Schema.String),
+        load: Effect.succeed(environment),
+        baseline: (environment) =>
+          ["Here is some useful information about the environment you are running in:", environment].join("\n"),
+        update: (_previous, environment) => ["The environment you are running in is now:", environment].join("\n"),
+      }),
+      Instructions.make({
+        key: Instructions.Key.make("core/date"),
+        codec: Schema.toCodecJson(Schema.String),
+        load: DateTime.nowAsDate.pipe(Effect.map((date) => date.toDateString())),
+        baseline: (date) => `Today's date: ${date}`,
+        update: (_previous, date) => `Today's date is now: ${date}`,
+      }),
+    ])
+
+    return Service.of({ load: () => Effect.succeed(instructions) })
+  }),
+)
+
+export const node = makeLocationNode({ service: Service, layer, deps: [Location.node] })