Add condition variable to set_trace

[alexandrebarbaruiva]

Add condition variable to set_trace to show console only when cond=True.

This way, instead of doing

for abc in range(1, 100):
    if abc == 13:
        import ipdb; ipdb.set_trace()

You do this

for abc in range(1, 100):
    import ipdb; ipdb.set_trace(cond=(abc==13))

[codecov-commenter]

Codecov Report

Merging #197 into master will decrease coverage by 0.38%. The diff coverage is 33.33%.

@@            Coverage Diff             @@
##           master     #197      +/-   ##
==========================================
- Coverage   67.15%   66.76%   -0.39%     
==========================================
  Files           6        6              
  Lines         344      346       +2     
==========================================
  Hits          231      231              
- Misses        113      115       +2     

Impacted Files	Coverage Δ
ipdb/__main__.py	46.28% <33.33%> (-0.54%)	:arrow_down:

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[gotcha]

Great ideas. Both the condition and the documentation improvement.

[gotcha]

Before merging, I'd like to see a changelog entry... and some doc for the new arg to set_trace

[alexandrebarbaruiva]

Changed code based on review and added documentation and a changelog entry!

[gotcha]

Released in https://pypi.org/project/ipdb/0.13.3/ Thanks !