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Before you start programming the Finder, you need to have a folder path to work with for testing purposes and an integer indicating the number of weeks old the file has to be in order to be marked Although specifying the integer isn t a big issue, providing a path may be a bit irritating It s not that I can t trust myself to spell out the full path, but I really like to make life easy for myself, so I have saved myself some time by creating a little lazy workaround For the workaround, start a new script, type the command choose folder, and run the script The choose folder command will force you to choose a folder and return a path to that folder, as shown in Figure 5-12..

Defining the Task Flow Parameter The first step is to define what parameters the task flow should take. On the task flow diagram, click the Overview tab to display the overview information for the task flow, and select Parameters. Here you can define parameters, both in and out, for the task flow. Click the green plus button to create a new Input Parameter Definition. You can define the name of the parameter, its type (which if blank defaults to String), and whether the parameter is required.

Figure 5-12. The result of the choose folder command The script in Figure 5-12 is a throwaway script. You can copy the resulting string (without the word alias) to your real script and then close this one without saving. The script starts with two variables: the_folder_path, which holds the path pointing to the folder you want to clean, and weeks_old, which will be the integer specifying how many weeks old the file has to be to be deleted (or have its label changed in this case). Figure 5-13 shows the initial stage of the script.

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Figure 5-13. The initial stage of the clean folder script The next step is to script the part that calculates what the date was x weeks ago. I used 12 weeks in my script, which ensures that some of the files in my test folder will be affected and some will not. The date calculation statement is rather simple, and like many other statements in AppleScript, you can write it on a single line or spread it out over several lines. The single-line version is as follows: set too_old_date to (current date) (weeks_old * weeks) The following part of the script will tell the Finder how to treat the old files. Script 5-8 shows how it ll look. Script 5-8. tell application "Finder" tell (every file of folder the_folder_path whose creation date comes before too_old_date) set label index to 2 end tell end tell Notice how you can use a single command to address only the files you want. In the final version of the script, the statement that now says set label index to 2 will simply say delete. Figure 5-14 shows the script with the added statements.

You also have to define where the parameter is stored while the task flow is executing. The field Value should default to #{pageFlowScope.createTFInputParam1}, which is a page flow scope parameter with the same name as the task flow parameter, or you can select this value from the Expression Builder dialog. This means that the parameter is being held in a special piece of memory called pageFlowScope, which is available while the task flow is running. To reference the parameter within the task flow pages, in this example, the text for a header, set the appropriate property to reference this special piece of memory where the parameter is being stored: #{pageFlowScope.createTFInputParam1}.