p5: add Key callback

[sbinet]

Update #6.

Signed-off-by: Sebastien Binet binet@cern.ch

[codecov]

Codecov Report

Attention: Patch coverage is 10.00000% with 9 lines in your changes missing coverage. Please review.

Project coverage is 79.48%. Comparing base (cbaf5d8) to head (a537c58).
Report is 18 commits behind head on main.

Files with missing lines	Patch %	Lines
p5.go	0.00%	5 Missing ⚠️
proc.go	20.00%	3 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #52      +/-   ##
==========================================
- Coverage   80.62%   79.48%   -1.15%     
==========================================
  Files           9        9              
  Lines         609      619      +10     
==========================================
+ Hits          491      492       +1     
- Misses         96      104       +8     
- Partials       22       23       +1     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.