Trace32 Write directory location to file

Question

So I finally decided to bite the bullet and rewrite my company's terrible Trace32 scripts. I'm trying to use a data file to save the pertinent information between runs so we can just run a Redo script to repeat any action without having to navigate a mess of dialog boxes and select our workspace files after every power cycle. In order to do this, I will need to save the user defined variables from the previous run (including file locations) to file so I have them in the next run. For reference, here is a part of my menu script.

; File: Do.cmm
GLOBAL &WORKSPACE
GLOBAL &FILETOLOAD
GLOBAL &TARGETSELVAL

&WORKSPACE="//tsclient\Z\Product_trunk_MS" ; Not the ideal solution

PRINT "Workspace is &WORKSPACE"

DIALOG
(
    HEADER "Do one of the following"

    POS 0. 0. 23.
    COMMAND.PREVIOUS: CHOOSEBOX "Repeat Last Command" ""
    POS 24. 0. 23.
    COMMAND.WORKSPACE: CHOOSEBOX "Change Workspace Location" ""

    POS 0. 3. 25.
    TEXT "Connect To an R7 Proc:"
    POS 0. 4. 6.
    COMMAND.IP0: CHOOSEBOX "IP0" ""
    POS 8. 4. 7.
    COMMAND.IP1: CHOOSEBOX "IP1" ""

    ; And a lot more of the same...

    POS 17. 16. 15.
    DEFBUTTON "OK" "continue"
)
DIALOG.SET COMMAND.PREVIOUS
STOP

IF DIALOG.BOOLEAN(COMMAND.IP0)
(
 &TARGETSELVAL=0x00030000
 &FILETOLOAD="&WORKSPACE\CPUs\IP0\build\output\IP0.axf"
)
IF DIALOG.BOOLEAN(COMMAND.IP1)
(
 &TARGETSELVAL=0x0003001
 &FILETOLOAD=&WORKSPACE\CPUs\IP1\build\output\IP1.axf
)
... And so on

The problem with this is that I have to edit the script every time I change workspaces. I want to be able to set this in the script above by selecting COMMAND.PREVIOUS and then selecting my new workspace root with the Windows selection dialog. I don't have a working implementation for that function, but I want it to look something like this:

IF DIALOG.BOOLEAN(COMMAND.WORKSPACE)
(
    PRINT "Select the new root directory that you would like to work out of."
    OPEN  #1 workspace.dat /Create
    &WORKSPACE= C/*/ ; I don't know how to do this here.
    WRITE #1 &WORKSPACE
    CLOSE #1
    ENDDO
)

Obviously, Data.load.binary "*.bin" is able to load a file to memory, but I don't need the file loaded yet, I just want the path. I did find that symbol.SOURCEPATH.SETBASEDIR c:\* will open a dialog box, but I am still having trouble getting at that information.

Additional Info

I have read through a lot of this and this while trying to find a solution. If there is a built in path variable that I should be using (like the aforementioned SOURCEPATH.SETBASEDIR, I wouldn't mind doing that instead. This is my first day writing Trace32 scripts, so I apologize in advance for my naivete. If it matters, I am using Trace32 Powerview for ARM Release Feb 2017 SP2 (32 bit) (So, the latest)

Answer 1

TRACE32 has the concept of a working directory. The command ChDir can be used to change the current directory:

 ChDir <path>

The current working directory can be retrieved with the PRACTICE function OS.PWD():

 &WORKSPACE=OS.PWD()

The script example above could be extended like this:

IF DIALOG.BOOLEAN(COMMAND.WORKSPACE)
(
  PRIVATE &old_directory

  &old_directory=OS.PWD()         // Save current directory
  ChDir *                         // Open directory selection dialog

  &WORKSPACE=OS.PWD()             // Update working directory
  OPEN #1 workspace.dat /Create
  WRITE #1 &WORKSPACE
  CLOSE #1

  ChDir &old_directory            // Restore previous directory selection
)