requires("1.46c") 
/* 
Macro randomizes the file names of all files in the selected direcotry 
- the selected directory must only contain image files 
- randomized files will be stored in a subfolder 
- in the original folder a file "randomizelist.txt" will be created that contains a two column list with newname and originalname 
Martin Hoehne feb 2012 
_file_randomizer_v09 
*/ 
run("Bio-Formats Macro Extensions");  //This will enable the bioformats macro functions; needed for zvi files 
print("\\Clear"); //clear the log 
source_dir = getDirectory("Source Directory"); 
setBatchMode(true); 
list = getFileList(source_dir); //list is already an array 
File.makeDirectory(source_dir+File.separator+"randomized"); // new directory for Data 
zufallliste=newArray(0); // this array will be filled with the randomized file names 
for (i=0; i<list.length; i++) { 
        zufall = round(random*(100000)); // generate randomized filename 
        // ensure that zufall is a 5-digit number -- needed later on for sorting 
        // numerical and alphabetical sorting have to give the same result!!! 
        if (zufall < 10000) { 
                do { 
                        zufall=zufall*10; 
                } while zufall<10000; 
        } 
        if (zufall > 99999) { 
                do { 
                        zufall=zufall/10;  
                } while zufall>99999; 
        } 
        zufallliste=Array.concat(zufallliste, zufall); //zufallliste is an array containing the randomized file names
        // open an image 
        Ext.openImagePlus(source_dir + "/" + list[i]); 
        // delete the original filename info from the metadata (displayed in the image header in imageJ) 
        setMetadata("Label", "randomized_filename");
        // save the file with the randomized filename (will later be renamed) 
        saveAs("tiff", source_dir+File.separator+"randomized"+File.separator+zufall+".tif"); ; 
        close(); 
} 
// rename the randomized files with a shorter finalname (1,2,3....) --better readable than the long random names 
// the random names (5 digit numbers) are sorted, and after sorting they [alphabetically because it is a string] smallest name 
// (number) is changed to 1, the second to 2 .... 
// since all randomnames are 5 digit numbers, the alphabetically sorting has the same result as sorting according to the number. 
// "decipher table": create an array with randomnames and originalnames fused into one string (and "random__" in between)
        bothnames=newArray(list.length); 
        for (i=0; i<list.length; i++) { 
                bothnames[i]=""+zufallliste[i]+"random__"+list[i]; 
        }
        // sort the array (smallest numbered filenames first), e.g. 
        // 34321random_realname1, 65433random_realname2, .... 
        Array.sort(bothnames);
        // create a txt file with finalname (1,2,3 ...) and original name (the part after "random__" in the array elements) [tab separated] 
        for (i=0; i<bothnames.length; i++) { 
                wo=indexOf(bothnames[i], "random__"); 
                File.append(i+1+"\t"+substring(bothnames[i], wo+8), source_dir+File.separator+"Randomizelist.txt"); // Appends string to the end of the specified file. 
        } 
// assign the final names 
Array.sort(zufallliste); 
for (i=0; i<zufallliste.length; i++) { 
        finalname=i+1; 
        //next two lines: 
        //randomname is the name of the file after randomization 
        //endname is the name the file will finally get (including path) 
        randomname=source_dir+File.separator+"randomized"+File.separator+zufallliste[i]+".tif"; 
        endname=source_dir+File.separator+"randomized"+File.separator+finalname+".tif";
        File.rename(randomname, endname); 
} 
setBatchMode(false); 
print("Your files are randomized");