[MacPorts] #28251: caml-findlib: add pre-deactivate code

[MacPorts]

#28251: caml-findlib: add pre-deactivate code
-------------------------------------+--------------------------------------
 Reporter:  ryandesign@…             |       Owner:  mww@…           
     Type:  enhancement              |      Status:  new             
 Priority:  Normal                   |   Milestone:                  
Component:  ports                    |     Version:  1.9.2           
 Keywords:                           |        Port:  caml-findlib    
-------------------------------------+--------------------------------------
 caml-findlib prints this message during installation:

 {{{
 --->  Activating caml-findlib @1.2.6_0
 ## Adding line `/opt/local/lib/ocaml/site-lib/stublibs' to file
 /opt/local/lib/ocaml/ld.conf
 ## Be sure to remove this line if you uninstall caml-findlib
 --->  Cleaning caml-findlib
 }}}

 And the portfile contains this commented-out block of code:

 {{{
 # pre-deactivate doesn't actually exist
 # which annoys me, because it means I can't remove the line I added to
 ld.conf
 #pre-deactivate {
 #        # remove our stublibs dir path from ld.conf
 #        set ocamlfind_destdir [file normalize ${prefix}/lib/ocaml/site-
 lib/stublibs]
 #        set ldconfpath ${destroot}[exec
 ${destroot}${prefix}/bin/ocamlfind printconf ldconf]
 #        set ldconfoutpath [file dirname $ldconfpath]/.[file tail
 $ldconfpath]~
 #        if {[file exists $ldconfpath]} then {
 #          set ldconf [open $ldconfpath r]
 #          set ldconfout [open $ldconfoutpath w]
 #          while {[gets $ldconf line] != -1} {
 #            if {![string equal $line $ocamlfind_destdir]} {
 #              puts $ldconfout $line
 #            }
 #          }
 #          close $ldconfout
 #          close $ldconf
 #          file rename -force $ldconfoutpath $ldconfpath
 #        }
 #}
 }}}

 MacPorts does support pre-deactivate code blocks now, as long as the user
 is using the sqlite registry. So caml-findlib should not print this
 message, and should remove the line it added in post-activate, unless the
 user is still using the flat registry. See other existing ports having
 pre-deactivate blocks for suggestions of how this can be done.

-- 
Ticket URL: <https://trac.macports.org/ticket/28251>
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