Re: IDE

[Lluís]

Dmitry Gutov writes:

> On 10/19/2015 04:04 PM, Lluís wrote:
[...]
>> I think I did not explain myself well. I meant having one hook variable for 
>> each
>> public method of each service type.

> Why aggregate them into service types, then? Just call each "public method" 
> (or
> hook) a separate service.

Just a matter of keeping tightly-related functionality together.


[...]
>> Ok, so the first time you call `project-current', the system can check all
>> project-types it knows about and see which ones apply to your file. From 
>> that a
>> project object object is created overlaying the matched project-types. Next 
>> time
>> you request `project-current' a cached value can be returned, or maybe 
>> looking
>> at the value of some parent directory.

> Caching is incidental. And I still don't know what "overlaying" is. In solid
> details, I mean.

Ok, a more specific example. Assume the service-type "service-type-symbols" that
provides a method to jump to symbols, and we're editing sources of the linux
kernel. Now, we have the following service implementations for that
service-type:

* service-symbols-cscope: Use external database.
* service-symbols-wisent: Parse source files, requires an implementation of
  "service-type-search-paths".

And we also have the following project-types:

* project-type-generic:
  * match: Return t if we can detect a project root using VC
  * service-types:
    * service-type-root: service-root-vc

* project-type-generic-c:
  * match: It's unclear when to activate it
  * service-types:
    * service-type-symbols: service-symbols-cscope, service-symbols-wisent

* project-type-linux:
  * match: We see a root directory for a Linux project
  * service-types:
    * service-type-root: service-root-linux
    * service-type-search-paths: service-search-paths-linux

If we assume all project types match, the resulting "overlaid" project for Linux
would have the following service-types:

* service-type-root: service-root-linux
* service-type-search-paths: service-search-paths-linux
* service-type-symbols: service-symbols-cscope, service-symbols-wisent

If we were not editing some Linux directory:

* service-type-root: service-root-vc
* service-type-symbols: service-symbols-cscope


Cheers,
  Lluis

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