[Octave-bug-tracker] [bug #57535] PKG_DEL is not sourced when path() removes a directory from the load path

[Mike Miller]

URL:
  <https://savannah.gnu.org/bugs/?57535>

                 Summary: PKG_DEL is not sourced when path() removes a
directory from the load path
                 Project: GNU Octave
            Submitted by: mtmiller
            Submitted on: Fri 03 Jan 2020 02:52:50 PM PST
                Category: Interpreter
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Feature Request
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: dev
        Operating System: Any

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Details:

For symmetry, the PKG_DEL file in a directory should be sourced when a
directory is removed from the load path as a side effect of calling path().

Here is an example that expresses the problem and the asymmetry:


>> orig_path = path ();
>> addpath /tmp/mypath
Adding /tmp/mypath to the load path
>> with_path = path ();
>> rmpath /tmp/mypath
Removing /tmp/mypath from the load path
>> path (orig_path);
>> path (with_path);
Adding /tmp/mypath to the load path
>> path (orig_path);
>> path (orig_path);
>> path (with_path);
Adding /tmp/mypath to the load path
>> path (with_path);
Adding /tmp/mypath to the load path
>> path (orig_path);
>> path (orig_path);


The PKG_ADD and PKG_DEL files (each containing just a disp) are each executed
when the user calls addpath() and rmpath() on the directory in question. The
PKG_ADD file is also sourced when the user calls path() to set an entire path
string and the new path contains /tmp/mypath. However, the PKG_DEL file is
*not* sourced when the user sets a new path() that does not contain
/tmp/mypath  and the previous path did contain it. I believe path() needs to
check for directories removed by assigning a new full load path for full
symmetry and reliability of the PKG_ADD and PKG_DEL features.




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