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ddRegTrigger: trigger a function when a cell is opened for edit

caver456

We'd like to register a trigger function to be called whenever a cell is requested to be opened for edit.  (or, a function called whenever a cell is accessed, which can determine whether the requested mode is edit/append)

For starters, we have this:

procedure(preObjAccessTrigger(a b c d e f)
  printf("preObjAccessTrigger called: %L %L %L %L %L %L\n" a b c d e f)
  t
)

ddRegTrigger("PreObjAccess" 'preObjAccessTrigger)

But the last argument (mode) is always "r" regardless of whether the cell is being opened for edit or for read, or being changed from edit to read or vice versa after it is already opened.

What we are trying to accomplish is to give a warning and prompt for confirmation before edit is allowed on cells from certain libraries.  Changing the linux permissions of the entire libraries in question is a much less desirable option.

What can be done to tell what file mode is being requested before the cell is actually opened in that mode?

I've also tried PreAutoCheckout:

procedure(preAutoCheckoutTrigger(a b)
  printf("preAutoCheckoutTrigger called: %L %L\n" a b)
  t
)

ddRegTrigger("PreAutoCheckout" 'preAutoCheckoutTrigger)

which does indeed get called (even though we are not using any Data Management) - but it errors out with an odd error every time - here's the CIW transcript immediately after trying to open a cell for edit:

\i ddsServOpen("v8685" "channel_i3712" "layout" "edit" nil)
\o preObjAccessTrigger called: "v8685" "channel_i3712" "layout" "*" nil "r"
\o preObjAccessTrigger called: "v8685" nil nil nil nil "r"
\o preObjAccessTrigger called: "v8685" "channel_i3712" "layout" "layout.oa" nil "r"
\o preObjAccessTrigger called: "v8685" "channel_i3712" "layout" "*" nil "r"
\o preObjAccessTrigger called: "v8685" "channel_i3712" "layout" nil nil "r"
\o preObjAccessTrigger called: "v8685" "channel_i3712" "layout" "layout.oa" nil "r"
\o preObjAccessTrigger called: nil nil nil "*" dd:0x2c4ad500 "r"
\o preAutoCheckoutTrigger called: (dd:0x2c4ad500) nil
\e *Error* car: Can't take car of atom - t
\w *WARNING* (DEBASE-102079): A SKILL error occurred in function _leDataTrigger
\a _hiSetCurrentWinNum(2)
\w *WARNING* (DEBASE-102084): Data trigger for viewType maskLayout failed.
\r t

  • caver456

    by the way this is 6.1.7-64b.500.18

  • Andrew Beckett
    in reply to caver456

    You might want to take a look at this post (from 5 years ago, but it includes some code I wrote back in 1998!)       Re: LibManager Edit Trigger/Callback     

    I think the PreAutoCheckout trigger is the right one to use, but it needs to return a list of t and nil for each object - see the example in the ACL.il code in the post I link to above to see how I do this. That ACL.il code was to implement an "access control list" mechanism for a library, so it's somewhat similar to your intention, I think.

    Regards,

    Andrew.

  • caver456
    in reply to Andrew Beckett

    thanks, this is a great lead.  Working on putting it to use now...

  • caver456
    in reply to caver456

    Ok, that led directly to a working solution.  Thanks for the help!

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