Step Experiment

/*                                                                                                                                            
 * This demo program tries to rename 3 groups of files without overwriting any of the files in any other groups                               
 * The files are numbered quasi-consecutively tmp1, tmp2, tmp3, tmp11, tmp12, tmp13, etc.                                                     
 * I rename the files by adding 10 to the numeric part of the name                                                                            
 * tmp1 cannot be renamed to tmp11 until the original tmp11 has been renamed to tmp21                                                         
 *                                                                                                                                            
 */                                                                                                                                           
var Step = require('step');                                                                                                                   
var fs = require('fs');                                                                                                                       
var sys = require('sys');                                                                                                                     
                                                                                                                                              
var group1 = ["/tmp/tmp21", "/tmp/tmp22", "/tmp/tmp23"];                                                                                      
var group2 = ["/tmp/tmp11", "/tmp/tmp12", "/tmp/tmp13"];                                                                                      
var group3 = ["/tmp/tmp1", "/tmp/tmp2", "/tmp/tmp3"];                                                                                         
                                                                                                                                              
                                                                                                                                              
function newName(name){                                                                                                                       
    var newName = "";                                                                                                                         
    var num = parseInt(name.slice(-2));                                                                                                       
    if(isNaN(num)){                                                                                                                           
        num = parseInt(name.slice(-1));                                                                                                       
        num = num + 10;                                                                                                                       
        newName = name.slice(0, -1) + num;                                                                                                    
    } else {                                                                                                                                  
        num = num + 10;                                                                                                                       
        newName = name.slice(0, -2) + num;                                                                                                    
    }                                                                                                                                         
                                                                                                                                              
    sys.puts(newName);                                                                                                                        
    return newName;                                                                                                                           
};                     

function renameGroup(group){                                                                                                                  
    group.forEach(                                                                                                                            
        function(file){                                                                                                                       
            sys.puts(file);                                                                                                                   
            rename(file);                                                                                                                     
        }                                                                                                                                     
    );                                                                                                                                        
};                                                                                                                                            
                                                                                                                                              
function idealRenameFiles(){                                                                                                                  
    Step(                                                                                                                                     
        function renameGroup1 (){                                                                                                             
            renameGroup(group1, this);                                                                                                        
        },                                                                                                                                    
        function renameGroup2 (){                                                                                                             
            renameGroup(group2, this);                                                                                                        
        },                                                                                                                                    
        function renameGroup3(){                                                                                                              
            renameGroup(group3);                                                                                                              
        }                                                                                                                                     
    );                                                                                                                                        
    sys.puts("success");                                                                                                                      
};                                                                                                                                            
                                                                                                                                              
function renameFiles(){                                                                                                                       
    Step(                                                                                                                                     
        function (){                                                                                                                          
            var parallel = this.parallel;                                                                                                     
            group1.forEach(                                                                                                                   
                function(file){                                                                                                               
                    sys.puts(file);                                                                                                           
                    fs.rename(file, newName(file), parallel());
        },                                                                                                                                    
        function (){                                                                                                                          
            var parallel = this.parallel;                                                                                                     
            group2.forEach(                                                                                                                   
                function(file){                                                                                                               
                    sys.puts(file);                                                                                                           
                    fs.rename(file, newName(file), parallel());                                                                               
                });                                                                                                                           
        },                                                                                                                                    
        function (){                                                                                                                          
            var parallel = this.parallel;                                                                                                     
            group3.forEach(                                                                                                                   
                function(file){                                                                                                               
                    sys.puts(file);                                                                                                           
                    fs.rename(file, newName(file), parallel());                                                                               
                });                                                                                                                           
        }                                                                                                                                     
    );                                                                                                                                        
};                                                                                                                                            
                                                                                                                                              
                                                                                                                                              
renameFiles();