Streamline fettching of locator grid

[corvus-ch]

Getting GPS locator in Conky working on my machine, I identified some easy improvements.

• Have only one script to update the data in gridinfo.txt
• Error handling prevents failure if gpsd is not running or is not connected to a GPS device
• Use Conky's cat instead of execi to read the grid info

This should simplify future maintenance and improves runtime stability.

[km4ack]

rebase this against the dev branch please.

[corvus-ch]

Done.

[km4ack]

By removing the execi 60 in conky, doesn't this mean that Conky will only read the file once or am I missing something? We typically want the GPS coordinates to be updated. Historically this has been every 60 seconds.

[corvus-ch]

By removing the execi 60 in conky, doesn't this mean that Conky will only read the file once or am I missing something? We typically want the GPS coordinates to be updated. Historically this has been every 60 seconds.

The content of ~/.conkyrc is evaluated once every update_interval seconds, which is set to 0.5. Everything except the commands with their own interval (for example execi), get evaluated at that interval. Reading the file every 0.5 seconds is OK because the inbuilt cat function reads the file within the Conky process itself. This is cheap. No shell gets spawned as it is the case with exec and execi which is actually an expensive operation in itself and only makes sense when calling an even more expensive script.

With my change, the only thing determining the position refresh rate, is the cron job executing ~/data/conky/grid. That is, unless we would want to go below update_interval of Conky which is unreasonable.

[km4ack]

Thanks for the explanation. I'll get this pulled into the next update

[corvus-ch]

Is there anything I can help with to get this merged?