Re: prog-mode not available in earlier Emacsen, need help with cfengine.el

[Ted Zlatanov]

On Sat, 26 Nov 2011 11:57:36 +0100 Reiner Steib <address@hidden> wrote: 

RS> On Fri, Nov 25 2011, Ted Zlatanov wrote:
RS> | On Tue, Nov 22 2011, Stefan Monnier wrote:
RS> | > I think that
RS> | >   (unless (fboundp 'prog-mode) (defalias 'prog-mode 'fundamental-mode))
RS> | > should do the trick.

>> I'll change the non-Emacs one so it explains this and has compatibility
>> code.  

RS> Please don't define/defalias prog-mode, because other code might test
RS> for (fboundp 'prog-mode) an expect a real prog-mode.

RS> ,----[ (info "(elisp)Coding Conventions") ]
RS> |    * If a package needs to define an alias or a new function for
RS> |      compatibility with some other version of Emacs, name it with the
RS> |      package prefix, not with the raw name with which it occurs in the
RS> |      other version.  Here is an example from Gnus, which provides many
RS> |      examples of such compatibility issues.
RS> | 
RS> |           (defalias 'gnus-point-at-bol
RS> |             (if (fboundp 'point-at-bol)
RS> |                 'point-at-bol
RS> |               'line-beginning-position))
RS> `----

Understood, thanks!

Ted