lfs -c impl; tvdos app spec change

assets/disk0/tvdos/bin/lfs.js

@@ -9,7 +9,7 @@ To list the collected files:
        lfs -t`)
 }
 
-const option = exec_args[1]
+let option = exec_args[1]
 const lfsPath = exec_args[2]
 const dirPath = exec_args[3]
 
@@ -19,3 +19,70 @@ if (option === undefined || lfsPath === undefined || option.toUpperCase() != "-T
     return 0
 }
 
+option = option.toUpperCase()
+
+
+function recurseDir(file, action) {
+    if (!file.isDirectory) {
+        action(file)
+    }
+    else {
+        file.list().forEach(fd => {
+            recurseDir(fd, action)
+        })
+    }
+
+}
+
+const lfsFile = files.open(_G.shell.resolvePathInput(lfsPath).full)
+const rootDir = files.open(_G.shell.resolvePathInput(dirPath).full)
+
+const rootDirPathLen = rootDir.fullPath.length
+
+if ("-C" == option) {
+    if (!rootDir.exists) {
+        printerrln(`No such directory: ${rootDir.fullPath}`)
+        return 1
+    }
+
+    let out = "TVDOSLFS\x01\x00\x00\x00\x00\x00\x00\x00"
+
+    recurseDir(rootDir, file=>{
+        let f = files.open(file.fullPath)
+        let flen = f.size
+        let fname = file.fullPath.substring(rootDirPathLen + 1)
+        let plen = fname.length
+
+        out += "\x01" + String.fromCharCode(
+            (plen >>> 8) & 255,
+             plen & 255
+        )
+
+        out += fname
+
+        out += String.fromCharCode(
+            (flen >>> 24) & 255,
+            (flen >>> 16) & 255,
+            (flen >>> 8) & 255,
+             flen & 255
+        )
+
+        out += f.sread()
+    })
+
+    lfsFile.swrite(out)
+}
+else if ("T" == option || "-X" == option) {
+    if (!lfsFile.exists) {
+        printerrln(`No such file: ${lfsFile.fullPath}`)
+        return 1
+    }
+
+
+    TODO()
+
+}
+else {
+    printerrln("Unknown option: " + option)
+    return 2
+}