gpioutil: Note that Debounce is not implemented

[lutzky]

Fixes #8

[codecov-commenter]

Codecov Report

Merging #10 (a3a867b) into main (1c39224) will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##            main     #10   +/-   ##
=====================================
  Coverage   98.3%   98.3%           
=====================================
  Files         31      31           
  Lines       2699    2699           
=====================================
  Hits        2652    2652           
  Misses        44      44           
  Partials       3       3           

Impacted Files	Coverage Δ
gpio/gpioutil/debounce.go	100.0% <ø> (ø)

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[maruel]

Humm it seems like I messed up the CI, I'll have to double check.

[maruel]

Thinking about it more I think it's because my canary testing trick to fetch a not-yet-merged-commit works but only for commits in branches but not for PRs. I will have to fix this. In the meantime I'll just do a quick check how it looks in local godoc and will merge later ignoring the CI failure.

[maruel]

Sorry for the delay, the reason is that I wanted to confirm how it looks in godoc, compare the current layout:

versus moving stuff around:

The second works by putting warning on a single line. I also feel putting it at the end of the description instead of the middle flows better for the reader. The rationale is that vast majority of the users will be using the online view at pkg.go.dev, only a minority will read the code. That's why I'm a bit picky about how it renders.

[maruel]

Doc for the second form:

// Debounce returns a debounced gpio.PinIO from a gpio.PinIO source. Only the   
// PinIn behavior is mutated.                                                   
//                                                                              
// denoise is a noise filter, which waits a pin to be steady for this amount    
// of time BEFORE reporting the new level.                                      
//                                                                              
// debounce will lock on a level for this amount of time AFTER the pin changed  
// state, ignoring following state changes.                                     
//                                                                              
// Either value can be 0.                                                       
//                                                                              
// WARNING                                                                      
//                                                                              
// This is not yet implemented.                                                 
//                                                                              
// TODO(https://github.com/periph/conn/issues/5): Implement this

[lutzky]

Makes sense, done.