Upgrade hint for existing ReScript projects

Author: cknitt

src/ExistingProject.res renamed to src/ExistingJsProject.res

@@ -0,0 +1,11 @@
+module C = PicoColors
+module P = ClackPrompts
+
+let showUpgradeHint = () =>
+  P.note(
+    ~title="Already installed",
+    ~message=`ReScript is already installed in your project.
+
+To upgrade to v11, check out the migration guide at
+${C.cyan("https://rescript-lang.org/docs/manual/latest/migrate-to-v11")}`,
+  )

src/ExistingProject.resi renamed to src/ExistingJsProject.resi

@@ -0,0 +1 @@
+let showUpgradeHint: unit => unit

src/ExistingRescriptProject.res

@@ -28,15 +28,16 @@ let run = async () => {
   P.note(
     ~title="Welcome to ReScript!",
     ~message=`${C.cyan("Fast, Simple, Fully Typed JavaScript from the Future")}
-https://www.rescript-lang.org`,
+https://rescript-lang.org`,
   )
 
   let packageJsonPath = Path.join2(Process.cwd(), "package.json")
   let rescriptJsonPath = Path.join2(Process.cwd(), "rescript.json")
   let bsconfigJsonPath = Path.join2(Process.cwd(), "bsconfig.json")
 
   if Fs.existsSync(rescriptJsonPath) || Fs.existsSync(bsconfigJsonPath) {
-    P.outro("ReScript is already installed. No changes were made to your project.")
+    ExistingRescriptProject.showUpgradeHint()
+    P.outro("No changes were made to your project.")
   } else if Fs.existsSync(packageJsonPath) {
     let packageJson = await JsonUtils.readJsonFile(packageJsonPath)
     let projectName =
@@ -48,7 +49,7 @@ https://www.rescript-lang.org`,
 
     if addToExistingProject {
       await handleError(~outro="Adding to project failed.", async () => {
-        await ExistingProject.addToExistingProject(~projectName)
+        await ExistingJsProject.addToExistingProject(~projectName)
         P.outro("Happy hacking!")
       })
     } else {