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Useful File Writing Subroutines
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The following are two subroutines you can use for basic text file saving. The first one saves the given text to a given text file, and the second handler adds the given text to the end of the given text file. --Saves a text file on write_text_to_file(the_file, the_text) set file_ref to open for access the_file with write permission set eof file_ref to 0 write the_text to file_ref as string close access file_ref end write_text_to_file --Adds text to a text file on append_text_to_file(the_file, the_text) set file_ref to open for access file theTextFilePath with write permission set file_length to get eof file_ref write the_text to file_ref as string starting at eof close access file_ref end append_text_to_file
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Using the write Command to Create a Script Log
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In this little exercise you will create a handler that I use in all my systems. The purpose is to create a detailed log of script activity. This log will help you determine what went wrong if the script crashes and you re on the other end of the phone with a communicationally challenged individual trying to describe the problem to you.
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CHAPTER 14 WORKING WITH FILES
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The idea behind the logging system is that instead of collecting all the messages into a long string and writing the whole thing to a file at the end, the script constantly writes the latest information to the end of the file. This way, if the script gets an error, you can pinpoint the error location in the script. You can make the log as detailed as you want by calling the handler from more areas in your script. The handler really is pretty simple. It receives a message to add to the log and adds it along with the date and time.
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You can make the log file folder structure more complex by incorporating a date-based folder structure: a year folder containing a folder for each month, containing all the log files for that month. For now, you will keep it simple. Instead, you will create a log file whose name will include the date and the file extension .log. You will use .log because on OS X, files with this extension are automatically opened by the console application, which adds a level of coolness to the mix. To keep things simple, the handler shown here just saves the log files to the current user s desktop, but you can easily modify it to use a different location if you want.
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Script 14-8 shows the finished add_to_log handler. To use it, call it from anywhere in the script with a simple text message that describes your current location in the script. Script 14-8. 1. on add_to_log(the_message) 2. set YY to year of (current date) 3. set MM to month of (current date) as integer 4. if MM < 10 then set MM to "0" & MM 5. set DD to day of (current date) 6. if DD < 10 then set DD to "0" & DD 7. set log_file_name to (YY as string) & "_" & MM & "_" & DD & ".log" 8. set log_file_path to (path to desktop as string) & log_file_name 9. set full_message to return & (current date) & return & the_message 10. set file_ID to open for access file log_file_path with write permission 11. write full_message to file_ID starting at eof 12. close access file_ID 13. end add_to_log In lines 2 through 8 you create the file path for the log file. This consists of the path to the user s desktop and a filename containing the date upon which the log entry was added. Getting the desktop folder path automatically allows this script to work on any machine without needing to be altered, and using today s date for the filename means that the add_to_log handler will automatically start a fresh log file for every day it s run. Line 9 puts the message together. Line 10 opens the log file for access, which will also create a new log file if one doesn t already exist. Line 11 appends the message to the end of the file, and line 12 closes the file again. To add an entry to the log, I just call the add_to_log handler like this: add_to_log("1044 Adding client name to job ticket") Another technique I use is to include a property called debug at the top of my scripts. This property contains a Boolean value that is used to enable or disable extra debugging code in a script. I then put add_to_log commands inside conditional blocks so they ll call the add_to_log handler only when debug is true. This makes it really easy to turn debugging messages on during testing and off again during normal use.
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