StartupSession.aplf@9d97012

In 19.0 on non-Windows platforms we currently look in the following directories for startup files (eg Run.aplf)
/opt/mdyalog/19.0/64/unicode
/home/andys/dyalog.files
/home/andys/dyalog.190U64.files

However, we are actually putting Tatin and Cider in /home/andys/.dyalog/dyalog.190U64.files.
While we think about all of this for 20.0, the immediate problem is to allow Cider to work in 19.0 on non-Windows platforms. My suggestion is to simply add /home/andys/.dyalog/dyalog.190U64.files to the list of directories to be searched. The following seems to work:

In StartupSession.aplf replace (line 107 ish):

     :If 0∊≢¨envVars
         defaults←{
             verSpec←{
                 ⍵:NoSlash 2⊃4070⌶⍬ ⍝ win only: version specific folder in user docs folder
                 num←∊2↑'.'Cut ver
                 uc←'UC'/⍨80 82=⎕DR'' ⍝ unicode/classic
                 bits←¯2↑'32',{⍵↓⍨⍵⍳'-'}os
                 home,'/dyalog.',num,uc,bits,'.files'
             }⍵
             user←⊃⎕NPARTS verSpec ⍝ /../
             verAgno←user,'dyalog.files' 'Dyalog APL Files'⊃⍨1+⍵
             ∊¨1 ⎕NPARTS dyalog verAgno verSpec ⍝ normalise
         }win
     :EndIf

with

     :If 0∊≢¨envVars
         defaults←{
             verSpec←{
                 ⍵:NoSlash 2⊃4070⌶⍬ ⍝ win only: version specific folder in user docs folder
                 num←∊2↑'.'Cut ver
                 uc←'UC'/⍨80 82=⎕DR'' ⍝ unicode/classic
                 bits←¯2↑'32',{⍵↓⍨⍵⍳'-'}os
                 ∊¨(,\home '/.dyalog'),¨⊂'/dyalog.',num,uc,bits,'.files'
             }⍵
             user←⊃⊃⎕NPARTS verSpec ⍝ /../
             verAgno←∊¨(,\user '.dyalog/'),¨⊂'dyalog.files' 'Dyalog APL Files'⊃⍨1+⍵
             ∊¨1 ⎕NPARTS (⊂dyalog),verAgno,verSpec ⍝ normalise
         }win
     :EndIf

On AIX: '''aaa''' ≡ 1 ⎕SE.Dyalog.Array.Serialise 'aaa'

On all other platforms: (,⊂'''aaa''') ≡ 1 ⎕SE.Dyalog.Array.Serialise 'aaa'

If you point DYALOGSTARTUPSE at a git checkout, you will see e.g.

Could not link "C:/Devt/NuGet/.git" with ⎕SE..git: ⎕SE.Link.Create: Not a properly named namespace: ⎕SE..git

At startup, the user needs to be warned if the most important parts of initialisation cannot be performed due to invalid configuration.

Andy needs to be consulted about exactly how the warning should be issued, whether APL should terminate, etc.

Dyalog 19.0 from 14th June so I think using commit c7cb02c

Start 19.0
5177⌶''
StartupSession ⎕SE 3 C:\Program Files\Dyalog\Dyalog APL-64 19.0 Unicode/StartupSession.aplf 0 226 7cccfa4d 2023 6
14 18 3 20 0

Similar links do not appear in earlier versions of Dyalog

If .NET is not available, DYALOGSTARTUPKEEPLINK should be ignored, with a warning, for example:

.NET not available - DYALOGSTARTUPKEEPLINK setting ignored