Configuring distributor and publisher with T-SQL

/* NOTE: 
1.You need to run the script for EACH distribution db u want to create
2.Model db cant be in use during the installation (It need exclusive lock on model in order to create distribution db)
*/
/****** Installing the server as a Distributor.  ******/
use master

declare @distribution_Db nvarchar(300),
@path nvarchar(300),
@SQL nvarchar(max),
@publisher nvarchar(300),
@password nvarchar(300),
@distributor nvarchar(200),
@create_folder bit

-------------- setting variables ------
set @distributor=@@servername
set @distribution_db=''
set @password=''
set @publisher=''
set @path =NULL -- leave null if u want to create distribution db in this forlder: 
--select substring(physical_name,1,patindex('%tempdb%',physical_name)-1) from sys.master_files where database_id in (select database_id from sys.databases where name='tempdb') and file_id =1
set @create_folder =1 --xp_cmdshell need to be enabled otherwise distribution db will be created in default folder. Set to 0 if you created folder manually.
-------------- end of variables --------

--Configuring Distributor
if not exists (select 1 from sys.servers where is_distributor=1 and name ='repl_distributor' and data_source=@distributor)
BEGIN
exec sp_adddistributor @distributor = @distributor, @password = @password
END

if @create_folder =1 and @path is NULL

BEGIN
		select @path=substring(physical_name,1,patindex('%tempdb%',physical_name)-1) from sys.master_files where database_id in (select database_id from sys.databases where name='tempdb') and file_id =1
END

if @create_folder =1 and @path is not NULL
	BEGIN
		set @path = @path + @distribution_Db
set @sql = 'exec xp_cmdshell ''mkdir '  +@path +''''
print @sql
if @create_folder =1
	BEGIN
	 if exists (select 1 from sys.configurations where name ='xp_cmdshell' and value_in_use =1)
	 BEGIN
	 
	print 'Creating Folder  ' + @path
	exec sp_executesql @sql
	END
	ELSE
	BEGIN
	print 'xp_cmdshell not enabled. Db will be created in default folder'
	set @path =NULL
	END
	END
END




-- Adding the distribution databases
if @path is not NULL
set @path = @path + '\'

if @path is NULL
print 'Distribution db will be created in default folder'


if not exists (select 1 from sys.databases where name =@distribution_db)
BEGIN
exec sp_adddistributiondb @database = @distribution_db, 
@data_folder = @path, 
@log_folder = @path,  
@min_distretention = 48, 
@max_distretention = 48, 
@history_retention = 24, 
@security_mode = 1
END


-- Adding the distribution publishers
exec sp_adddistpublisher @publisher =@publisher,
 @distribution_db = @distribution_Db, 
 @security_mode = 1, 
  @publisher_type = N'MSSQLSERVER'

/****** End: Script to be run at Distributor ******/



select 'Execute on publisher ' + @publisher
select 'use master 
exec sp_adddistributor @distributor = ''' + @distributor + ''' , @password = '''+ @password +''''