Second Enhancement to File List

continued


We have added two new features to FileList. And we used SUnit, where possible, to test our code. Let's do a little houskeeping.

House Keeping

If we open up a "simple change sorter" we can see a small handfull of changed classes.

The change set comments are in need of updating, so let's do that first. I changed the comments to read as follows:
"Change Set:        FileList-mods
Date:               13 May 2003
Author:             Stephan B. Wessels

Added a simple enhancement where the file name of the selected file
can be copied to the clipboard. There is an existing menu operation
which supports copying the whole file name path to the clipboard and
this was left alone. Also provided a way to copy a file from either a local
directory or a remote one to a local directory. No provision has been made to
copy a local file to the remote at this time, however."
By convention, the date and original author name remain untouched. I use the edit history down below the comments/description to track modifications. This is what my version of the change-set preamble looks like.

We should also examine the change set contents to be sure we have what we intended. I tend to select each class in the change set and then review the methods identified, one-by-one.

When you get to the #createTempFile method, Squeak reports that the method was added and then removed. The change set recorded we added this method, and the later refactored (by creating the new method #creatTempFileIn:). So this method no longer exists in the system.

The change set must record events like this. Imagine that we gave a copy of our previous change set, the one without this refactoring, to another Squeak developer. And then we handed this new version to that developer at a later time. If the new change set did not have this reference that the method was removed, then that person's development image would contain both the old method and our new one. So this is okay.

After this review of the change set we may decide it's ready to go. There is one condition to consider, however. To make this all work, like good Smalltalkers, we used some existing code. We used a method on FileList2 which was defined in the change set "Dialogs-sbw". We used SqueakMap to load it. The SqueakMap package name was "FileList2 Dialogs Enhancement". In other words, for this new change set "FileList-mods" to work, "Dialogs-sbw" is a prerequisite change set.

SqueakMap, in it's present condition, does not handle prerequisite packages. There are a number of ways we could handle this. One way would be to simply add a comment to the "FileList-mods" change-set preamble reminding the user to please load the other change set first. And that would work. Another way would be to have a mechanism to auto-load the prerequisite change set for us automatically. If you installed some of the optional enhancement packages earlier in this tutorial, you may remember seeing prerequisite packages getting loaded for you.

Let's take the approach of adding prerequisite loading to our new change set. The approach we are going to use here is not anything "official". It's one way that I have solved this problem for my own Squeak enhancement packages.

Adding a Prerequisite Change Set to be loaded via SqueakMap

Open up a Simple Change Sorter and examine your installed change sets. Verify that you have the change set named "ChangeSet-Revision-Tag-sbw" installed. You should have it as a result of doing the optional enhancements earlier. If it is not installed, use the Package Loader and install the SqueakMap package named "ChangeSet-Revision-Tag-sbw".

Open up a Squeak Browser and examine the ChangeSorter class class methods. You will see a method #generatePreflightCheckExample. The first line in the method is a simple comment line that shows an example of how to use it. Select the code ChangeSorter generatePreflightCheckExample and perform a "Do It". A workspace window will open that looks like this.


It's an example workspace of what we will need, after it is tailored for our situation, to make the automatic prerequisite load. We will modify three variables.

The line for prereqCSName should be modified to specify the name of the change set that is our prerequisite. In our situation, that is 'Dialogs-sbw'.

The line for prereqSMName should be modified to specify the name of the SqueakMap package. We will use 'FileList2 Dialogs Enhancement'.

The line for prereqRevDateRqd specifies a revision level of minimum change set. For example, the author of the prerequisite change set may have released more than one version to SqueakMap and we want to be sure to get at least the right version. We should use '15-apr-2003'.

When you have modified the workspace, the top few lines (containing the variable definitions), will look like this.


Copy the entire contents of the workspace into your paste buffer and paste it into the "FileList-mods" preamble after the comment statemnt ends.


When you attempt to save the new change set preamble contents, Squeak will ask you if the code should be included.

Confirm by clicking on "OK".

You can choose "file out" from the change set menu now. Our work is saved.

Continue on to Unfinished Work to Consider.

Back to the beginning of this example.

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