fix: handle error when building schema

The code changes in pylon-dev/src/index.ts now include error handling
when building the schema. If an error occurs during the build process,
the server will be killed and the error will be logged.
This ensures that the server is not left running in an inconsistent state.

In the addition, the development server no longer exits when a build error
occurs. When a user makes a syntax error and fixes it afterwards, the
service is up and running again without the need to manually restart it.

packages/pylon-builder/src/bundler/bundler.ts

@@ -113,10 +113,14 @@ export class Bundler {
       const folder = path.dirname(this.sfiFilePath)
 
       chokidar.watch(folder).on('change', async () => {
-        const changedSchema = await buildOnce()
+        try {
+          const changedSchema = await buildOnce()
 
-        if (options.onWatch) {
-          options.onWatch(changedSchema)
+          if (options.onWatch) {
+            options.onWatch(changedSchema)
+          }
+        } catch (e) {
+          consola.error(e)
         }
       })
     }

packages/pylon-dev/src/index.ts

@@ -160,26 +160,46 @@ async function main(options: ArgOptions, command: Command) {
       outputFilePath: `./.pylon`,
       watch: true,
       onWatch: async (schemaChanged: boolean) => {
+        const isServerRunning = currentProc !== null
+
+        if (isServerRunning) {
+          consola.start('[Pylon]: Reloading server')
+        } else {
+          consola.start('[Pylon]: Starting server')
+        }
+
         await serve(schemaChanged)
 
-        consola.start('[Pylon]: Reloading server')
+        if (isServerRunning) {
+          consola.ready('[Pylon]: Server reloaded')
+        } else {
+          consola.ready('[Pylon]: Server started')
+
+          consola.box(`
+    Pylon is up and running!
+
+    Press \`Ctrl + C\` to stop the server.
+
+    Encounter any issues? Report them here:  
+    https://github.com/getcronit/pylon/issues
+
+    We value your feedback—help us make Pylon even better!
+          `)
+        }
 
         if (schemaChanged) {
           consola.info('[Pylon]: Schema updated')
         }
       }
     })
-  } catch (e) {
-    consola.error("[Pylon]: Couldn't build schema", e)
-  }
 
-  consola.success('[Pylon]: Schema built')
+    consola.success('[Pylon]: Schema built')
 
-  consola.start('[Pylon]: Starting server')
-  await serve(true)
-  consola.ready('[Pylon]: Server started')
+    consola.start('[Pylon]: Starting server')
+    await serve(true)
+    consola.ready('[Pylon]: Server started')
 
-  consola.box(`
+    consola.box(`
     Pylon is up and running!
 
     Press \`Ctrl + C\` to stop the server.
@@ -189,6 +209,21 @@ async function main(options: ArgOptions, command: Command) {
   
     We value your feedback—help us make Pylon even better!
   `)
+  } catch (e) {
+    consola.error("[Pylon]: Couldn't build schema", e)
+
+    // Kill the server if it's running
+    const proc = currentProc as ChildProcess | null
+    if (proc) {
+      proc.removeAllListeners()
+
+      kill(proc.pid, 'SIGINT', err => {
+        if (err) {
+          consola.error(err)
+        }
+      })
+    }
+  }
 }
 
 program.parse()