Safety & Simplicity for Config Files

[TTWNO]

At this time, Rust's type system is not being used to verify (before the program starts) that the configuration file is correct.
Error with the JSON are far too common, and kind of hard to diagnose.

This issue contains two jobs:

1. Simplify the config file to allow the use of non-JSON strings as Odilia events. Currently each event is fairly long due to the verbosity of JSON. -- Simplicity
2. Verify during the initialization process (before grabbing input devices) that the config file is correct and that all the keybindings will be sent properly through the socket. -- Safety

This is boring work, but should be fairly easy for a beginner to figure out, so I will label it as good first issue.

[francois-caddet]

I'm asking myself two things:

• Why do we use json for configuration? I personaly prefer toml/ini files for possibly handwritten configs.
• for the speech config, in a long term would it be a good idea to configure it with DConf? to keep the last set value by the user when restarting odilia and may be to integrate the configuration of odilia in the setting pannel of the desktop. For this last point, not sure how it is done generaly and neither if it's realy a good way to do it. It's more or less an Android like way to configure. but not realy common in linux an could be complex to maintain.

Edit: sorry I just see we use toml actualy.

Edit2: Does this issue relate to sohkd?

[francois-caddet]

Actualy where is the loading code for the config?I saw a verry simple one in common/configbut not sure if it's the only one. Can anyone help me to start on this issue?

thanks

[TTWNO]

We don't currently use any configured values.

Previously, we did at least load the config file, but we weren't using it so I removed it some time ago.

Starting ftom scratch is fine here. Use serde :)

Any config loaded should be added to the Stste struct in odilia/src/state.rs

[francois-caddet]

Ok and so,whatshould be configured?verbosity atleast.
probably all the values ofspeed, pitch, volume...
Should I load config for keybindings also? that should be in the input crate right?

[TTWNO]

I'm going to say for now, avoid keybindings. How that's done needs to be completelt rewritten.

[francois-caddet]

I'll stay generic over how we load the config, because I'm not sure all of them have to be placed in a configuration file. e.g.: the pitch/volume/speed are something which could change a lot during runtime so may be placed in DConf stuf in a future improvement step no?

[TTWNO]

Yes, that is a reasonable assumptuon.

Even something like the welcome message would be good right now.