feat: configurable shell selection + desktop settings UI (#20602)

packages/opencode/test/session/prompt.test.ts

@@ -316,9 +316,11 @@ const addSubtask = (sessionID: SessionID, messageID: MessageID, model = ref) =>
   })
 
 const boot = Effect.fn("test.boot")(function* (input?: { title?: string }) {
+  const config = yield* Config.Service
   const prompt = yield* SessionPrompt.Service
   const run = yield* SessionRunState.Service
   const sessions = yield* Session.Service
+  yield* config.get()
   const chat = yield* sessions.create(input ?? { title: "Pinned" })
   return { prompt, run, sessions, chat }
 })
@@ -1078,6 +1080,32 @@ unix("shell completes a fast command on the preferred shell", () =>
   ),
 )
 
+unix(
+  "shell uses configured shell over env shell",
+  () =>
+    withSh(() =>
+      provideTmpdirInstance(
+        (_dir) =>
+          Effect.gen(function* () {
+            if (!Bun.which("bash")) return
+
+            const { prompt, chat } = yield* boot()
+            const result = yield* prompt.shell({
+              sessionID: chat.id,
+              agent: "build",
+              command: "[[ 1 -eq 1 ]] && printf configured",
+            })
+
+            const tool = completedTool(result.parts)
+            if (!tool) return
+            expect(tool.state.output).toContain("configured")
+          }),
+        { git: true, config: { ...cfg, shell: "bash" } },
+      ),
+    ),
+  30_000,
+)
+
 unix("shell commands can change directory after startup", () =>
   provideTmpdirInstance(
     (dir) =>
@@ -1263,6 +1291,45 @@ it.live(
   3_000,
 )
 
+unix(
+  "command ! expansion uses configured shell over env shell",
+  () =>
+    withSh(() =>
+      provideTmpdirServer(
+        ({ llm }) =>
+          Effect.gen(function* () {
+            if (!Bun.which("bash")) return
+
+            const { prompt, chat } = yield* boot()
+            yield* llm.text("done")
+
+            const result = yield* prompt.command({
+              sessionID: chat.id,
+              command: "probe",
+              arguments: "",
+            })
+
+            expect(result.info.role).toBe("assistant")
+            const inputs = yield* llm.inputs
+            expect(JSON.stringify(inputs.at(-1)?.messages)).toContain("configured")
+          }),
+        {
+          git: true,
+          config: (url) => ({
+            ...providerCfg(url),
+            shell: "bash",
+            command: {
+              probe: {
+                template: "Probe: !`[[ 1 -eq 1 ]] && printf configured`",
+              },
+            },
+          }),
+        },
+      ),
+    ),
+  30_000,
+)
+
 unix(
   "cancel interrupts shell and resolves cleanly",
   () =>