fix(upgrade): handle brew tap migration from sst/tap and core

packages/opencode/src/cli/cmd/upgrade.ts

@@ -42,6 +42,41 @@ export const UpgradeCommand = {
       }
     }
     prompts.log.info("Using method: " + method)
+
+    if (method === "brew") {
+      const formula = await Installation.getBrewFormula()
+      const commands = Installation.getMigrationCommands(formula)
+
+      if (commands) {
+        const reason =
+          formula === "sst/tap/opencode"
+            ? "You have the old sst/tap formula installed. The tap has been renamed to anomalyco/tap."
+            : "You are on the homebrew core formula, which updates every ~10 versions.\nThe anomalyco/tap formula updates on every release."
+
+        prompts.log.warn(`${reason}\n\nTo migrate: ${commands.join(" && ")}`)
+
+        const migrate = await prompts.confirm({
+          message: "Would you like to migrate to the anomalyco/tap? (You can run these commands manually later)",
+          initialValue: true,
+        })
+        if (migrate) {
+          for (const cmd of commands) {
+            const migrationSpinner = prompts.spinner()
+            migrationSpinner.start(cmd)
+            try {
+              await Installation.executeMigration([cmd])
+              migrationSpinner.stop(cmd)
+            } catch (err) {
+              migrationSpinner.stop(`Failed: ${cmd}`, 1)
+              if (err instanceof Error) prompts.log.error(err.message)
+              prompts.outro("Done")
+              return
+            }
+          }
+        }
+      }
+    }
+
     const target = args.target ? args.target.replace(/^v/, "") : await Installation.latest()
 
     if (Installation.VERSION === target) {

packages/opencode/src/installation/index.ts

@@ -110,14 +110,43 @@ export namespace Installation {
     }),
   )
 
-  async function getBrewFormula() {
-    const tapFormula = await $`brew list --formula anomalyco/tap/opencode`.throws(false).quiet().text()
-    if (tapFormula.includes("opencode")) return "anomalyco/tap/opencode"
+  export type BrewFormula = "anomalyco/tap/opencode" | "sst/tap/opencode" | "opencode"
+
+  export async function getBrewFormula(): Promise<BrewFormula> {
+    const anomalycoTap = await $`brew list --formula anomalyco/tap/opencode`.throws(false).quiet().text()
+    if (anomalycoTap.includes("opencode")) return "anomalyco/tap/opencode"
+
+    const sstTap = await $`brew list --formula sst/tap/opencode`.throws(false).quiet().text()
+    if (sstTap.includes("opencode")) return "sst/tap/opencode"
+
     const coreFormula = await $`brew list --formula opencode`.throws(false).quiet().text()
     if (coreFormula.includes("opencode")) return "opencode"
+
     return "opencode"
   }
 
+  export function getMigrationCommands(from: BrewFormula): string[] | null {
+    if (from === "anomalyco/tap/opencode") return null
+    if (from === "sst/tap/opencode") {
+      return ["brew uninstall sst/tap/opencode", "brew install anomalyco/tap/opencode"]
+    }
+    if (from === "opencode") {
+      return ["brew uninstall opencode", "brew install anomalyco/tap/opencode"]
+    }
+    return null
+  }
+
+  export async function executeMigration(commands: string[]) {
+    for (const cmd of commands) {
+      const parts = cmd.split(" ")
+      if (parts[0] === "brew" && parts[1] === "uninstall") {
+        await $`brew uninstall ${parts[2]}`.env({ HOMEBREW_NO_AUTO_UPDATE: "1", ...process.env }).quiet()
+      } else if (parts[0] === "brew" && parts[1] === "install") {
+        await $`brew install ${parts[2]}`.env({ HOMEBREW_NO_AUTO_UPDATE: "1", ...process.env }).quiet()
+      }
+    }
+  }
+
   export async function upgrade(method: Method, target: string) {
     let cmd
     switch (method) {

packages/opencode/test/installation/brew-migration.test.ts

@@ -0,0 +1,22 @@
+import { describe, expect, test } from "bun:test"
+import { Installation } from "../../src/installation"
+
+describe("installation.brew migration", () => {
+  test("no migration when already on anomalyco tap", () => {
+    expect(Installation.getMigrationCommands("anomalyco/tap/opencode")).toBeNull()
+  })
+
+  test("sst tap suggests migrate to anomalyco tap", () => {
+    expect(Installation.getMigrationCommands("sst/tap/opencode")).toEqual([
+      "brew uninstall sst/tap/opencode",
+      "brew install anomalyco/tap/opencode",
+    ])
+  })
+
+  test("core formula suggests migrate to anomalyco tap", () => {
+    expect(Installation.getMigrationCommands("opencode")).toEqual([
+      "brew uninstall opencode",
+      "brew install anomalyco/tap/opencode",
+    ])
+  })
+})