feat: trim whitechars for file with multiline

[sumo-drosiek]

Strip whitechars if using multiline

[codecov]

Codecov Report

Merging #212 (29c08f0) into main (8b99134) will decrease coverage by 0.0%.
The diff coverage is 64.7%.

@@           Coverage Diff           @@
##            main    #212     +/-   ##
=======================================
- Coverage   75.6%   75.5%   -0.1%     
=======================================
  Files         95      95             
  Lines       4399    4408      +9     
=======================================
+ Hits        3327    3332      +5     
- Misses       745     748      +3     
- Partials     327     328      +1     

Impacted Files	Coverage Δ
operator/helper/multiline.go	84.2% <64.7%> (-3.3%)	⬇️
operator/builtin/input/tcp/tcp.go	72.9% <0.0%> (-1.7%)	⬇️
operator/builtin/input/file/reader.go	64.5% <0.0%> (+2.1%)	⬆️

[djaglowski]

advance is used to set the starting point for the next read. By advancing after trimming, I think we may be setting up the value such that we will reread the whitespace, which doesn't seem ideal. Unless I'm misunderstanding some part of this, then I would expect that we do:

Suggested change

	token = trimWhitespaces(data)
	advance = len(token)
	token = trimWhitespaces(data)
	advance = len(data)