[MacPorts] #51706: platform statement: support an else clause

[MacPorts]

#51706: platform statement: support an else clause
--------------------------+--------------------------------
  Reporter:  rjvbertin@…  |      Owner:  macports-tickets@…
      Type:  enhancement  |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  base         |    Version:
Resolution:               |   Keywords:  haspatch
      Port:               |
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Changes (by ryandesign@…):

 * keywords:   => haspatch


Old description:

> As discussed on the ML a short while ago:
>
> This patch introduces support for an else clause in the `platform`
> statement. Typical use would a port that needs to distinguish between 2
> OS versions that require mutually exclusive treatment in multiple
> locations.
> With an else clause means that can be done without duplicating platform
> statements and without resorting to if/else constructs with their less
> elegant syntax in the test expression.
>
> I haven't tested this yet but it might actually be possible to chain the
> commands:
>
> ```
> platform darwin 10 {
> # older
> } [else] platform darwin 11 {
> # old
> } else {
> # younger
> }
> ```
>
> If this is considered acceptable for a future MacPorts base version I'd
> really like to request a temporary vector to provide the new syntax ASAP,
> for instance through a PortGroup file.

New description:

 As discussed on the ML a short while ago:

 This patch introduces support for an else clause in the `platform`
 statement. Typical use would a port that needs to distinguish between 2 OS
 versions that require mutually exclusive treatment in multiple locations.
 With an else clause means that can be done without duplicating platform
 statements and without resorting to if/else constructs with their less
 elegant syntax in the test expression.

 I haven't tested this yet but it might actually be possible to chain the
 commands:

 {{{
 platform darwin 10 {
 # older
 } [else] platform darwin 11 {
 # old
 } else {
 # younger
 }
 }}}

 If this is considered acceptable for a future MacPorts base version I'd
 really like to request a temporary vector to provide the new syntax ASAP,
 for instance through a PortGroup file.

--

-- 
Ticket URL: <https://trac.macports.org/ticket/51706#comment:2>
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