Re: new elpa packages for ada-mode project related stuff

[Dmitry Gutov <dgutov@yandex.ru>]

On 16.01.2019 21:57, Stephen Leake wrote:
> I'd like to create one or more new ELPA packages to support the ada-mode
> project code.
> 
> The new files are:
>      
> env-project.el -- 70 lines
>      Adds three new project defgenerics:
>          project-refresh
>          project-select
>          project-deselect
> 
>      These should be in project.el in some future version of emacs.

I don't think so.

project-refresh is debatable, but when would the user want to call it? 
There's no way for them to know. It'd be much better to use caches with 
proper automatic invalidation, e.g. with filenotify. IOW, I'd like to 
see the feature in the wild, in different project backends, and then we 
can incorporate it.

But project-select and project-deselect, as previously discussed, can be 
implemented in terms of project-find-functions. If you and some other 
users find it handy to have an Emacs-wide global project and select it 
manually, be my guest, but please make it a globalized minor mode, and 
add a project-find-functions entry for it. The said minor mode can have 
its own commands to -select and -deselect.

>      Then defines a project defstruct that declares/undeclares
> environment variables when it is selected/deselected. ada-mode project
> inherits this.

Err, I'd rather have it user explicitly in certain functions like Stefan 
discussed, rather than invisibly change env variables in the whole session.

> path-iterator.el -- 243 lines
>      Provides an iterator for directory paths; returns one file at a
>      time. Handles a mix of flat and recursive directories.
>      Probably should be rewritten to use generator.el.

Why an iterator, though? And not just a list?

If it's used in a completion table, surely the whole sequence will have 
to be realized anyway the first time user types TAB.

> uniquify-files.el -- 687 lines
>      Provides a completion style and completion table that presents
>      uniquified file names to the user for completion.
>      Uses path-iterator.el
>      ada-mode project-file-completion-table uses this.

I wrote my feelings on that subject in a separate email. A neat feature, 
I'm sure, but I'd prefer if it were implemented in a radically different 
way.