create watcher script to restart changed scripts

README.md

@@ -33,4 +33,4 @@ To update your Netscript Definitions, run `npm run defs` in a terminal
 Press F1 and Select `Bitburner: Enable File Watcher` to enable auto uploading to the game
 
 ## Todo
-Create a bitburner script which detects updates to files and restarts the running script automatically
+~~Create a bitburner script which detects updates to files and restarts the running script automatically~~

src/watcher.ts

@@ -0,0 +1,42 @@
+import { NS, ProcessInfo } from "../NetscriptDefinitions"
+
+export async function main(ns : NS) : Promise<void> {
+    const hashes : any = {}
+
+    const files = ns.ls('home', '.js') 
+    for ( const file of files ) {
+        const contents = ns.read(file)
+        hashes[file] = getHash(contents)
+    }
+
+    while(true) {
+        const files = ns.ls('home', '.js')
+
+        for(const file of files ) {
+            const contents = ns.read(file)
+            const hash = getHash(contents)
+
+            if(hash != hashes[file]) {
+                ns.tprint(`INFO: Detected change in ${file}`)
+
+                const processes = ns.ps().filter((p : ProcessInfo) => {
+                    return p.filename == file
+                })
+
+                for(const process of processes) {
+                    ns.tprint(`INFO: Restarting ${process.filename} ${process.args} -t ${process.threads}`)
+                    ns.kill(process.pid, ns.getHostname())
+                    ns.run(process.filename, process.threads, ...process.args)
+                }
+
+                hashes[file] = hash
+            }
+        }
+
+        await ns.sleep(1000)
+    }
+}
+
+function getHash(input : string) : number {
+    return input.split("").reduce( (a, b) => ((a << 5) - 1) + b.charCodeAt(0)|0, 0)
+}