SyncScan Sample Codes - Clean a Directory

This program deletes files from a directory and optionaly its sub-directories. At start, the program check command line arguments. If a required argument is missing or invalid, it prompts the user to enter one.

Required command line arguments:

• Directory
• Including sub-directroy (y/n)
• File extension names separated with '?'
• The extension names are to be deleted or kept (d/k).

Part 1: The Command Line Arguments Parser

//Argument 1 - the directory to clean
var dir=app.argv(0);
var fo=app.FindFile(dir);
while(fo.Valid? !fo.AttributeDirectory : true)
{
    dir=app.Input("Enter a directory to clean: ");
    if(!dir) // If use just hit enter, we quit
    {
        app.Exit(-1);
    }
    fo=app.FindFile(dir);
}

//Argument 2 - Sub-directories?
var yesno=app.argv(1).toLowerCase(); 
if(yesno!='y' && yesno!='n')
{
    app.Print("Scan sub-directories? (y/n)\n");
    while(yesno!='y' && yesno!='n')
    {
        yesno=app.getch(false).toLowerCase();
    }
}
subdir=(yesno=='y'? true:false);

//Argument 3 - File extension names
var extensions=app.argv(2).toLowerCase();
while(!extensions)
{
    extensions=app.Input("Enter file extension names (separated with '?'. example: ?obj?pch?opt?): ");
}
extensions=extensions.toLowerCase();


//Argument 3 - Delete or keep?
yesno=app.argv(3).toLowerCase();
if(yesno!='d' && yesno!='k')
{
    app.Print("Should we delete or keep files with the specified extension names? (d/k)\n");
    while(yesno!='d' && yesno!='k')
    {
        yesno=app.getch(false).toLowerCase();
    }
}
var delExtensions=(yesno=='d'? true : false);


//We have all the required arguments now
//Prompt the user to press any key to continue. This gives the user a chance to terminate the program by Ctrl+C
app.Print("\nClean " + dir + (subdir? " and sub-directories" : " only")  + (delExtensions? "delete" : "keep") + " files with one of the extension names: " + extensions+"\n");
app.Print("Press any key to continue....\n");
app.getch();
app.ScanDirectory(dir, subdir, CleanCallback);

Part 2: The Callback Function

function CleanCallback(dirFlag, fo)
{
    switch(dirFlag)
    {
    case 2: //fo is the root directory passed to  app.ScanDirectory
        app.Print("\nStart cleaning " + fo.FullPath+"\n"); 
        break;
    case -2: //End of the job
        app.Print("\nEnd of cleaning " + fo.FullPath+"\n");
        break;
    case 0: //fo is a file
        var ext="?"+fo.ExtensionName.toLowerCase()+"?";
        var i=extensions.indexOf(ext);
        if(delExtensions? (i>=0) : (i<0))
        {
            app.Print("Delete " + fo.FullPath+"\n");
            fo.Delete();
        }
        break;
    case 1: //Enter a sub-directory
        app.Print("Begin scanning sub-directory: "+fo.FullPath+"\n");
        break;
    case -1: //Leave a sub-directory
        app.Print("End of scanning sub-directory: "+fo.FullPath+"\n");
        break;
    }

    //Give the user a chance to stop this programm by pressing ESC
    if(app.kbhit())
    {
        var ch=app.getch();
        if(ch==27)
        {
            app.Print("*** Abort ***\n");
            return(-1);
        }
    }
}