[Request] Truncate warnings differently

[franknarf1]

I have data in an obnoxious format involving a ton of columns with long names.

I figure I can melt part of the data to make it more manageable:

geoDT = melt(DT[, names(DT) %like% "(^Id[0-9]*$)|GEOGRAPHIC AREA CODES", with=FALSE], id=1:2)

Warning message:
In melt.data.table(DT[, names(DT) %like% "(^Id[0-9]*$)|GEOGRAPHIC AREA CODES", :
'measure.vars' [GEOGRAPHIC AREA CODES - Region, GEOGRAPHIC AREA CODES - Division, GEOGRAPHIC AREA CODES - State (FIPS), GEOGRAPHIC AREA CODES - County, GEOGRAPHIC AREA CODES - FIPS County Class Code, GEOGRAPHIC AREA CODES - County Size Code, GEOGRAPHIC AREA CODES - County Subdivision (FIPS), GEOGRAPHIC AREA CODES - FIPS County Subdivision Class Code, GEOGRAPHIC AREA CODES - County Subdivision Size Code, GEOGRAPHIC AREA CODES - Place (FIPS), GEOGRAPHIC AREA CODES - FIPS Place Class Code, GEOGRAPHIC AREA CODES - Place Size Code, GEOGRAPHIC AREA CODES - Census Tract, GEOGRAPHIC AREA CODES - Block Group, GEOGRAPHIC AREA CODES - Block, GEOGRAPHIC AREA CODES - Internal Use Code, GEOGRAPHIC AREA CODES - Consolidated City (FIPS), GEOGRAPHIC AREA CODES - FIPS Consolidated City Class Code, GEOGRAPHIC AREA CODES - Consolidated City Size Code, GEOGRAPHIC AREA CODES - American Indian Area/Alaska Native Area/Hawaiian Home Land (Census), GEOGRAPHIC AREA CODES - American Indian Area/Alaska Native Area [... truncated]

My problem is that I cannot see what the actual warning message is because too many columns are involved, so I hit "[... truncated]" first. I know from experience that the warning is

[$cols] are not all of the same type. By order of hierarchy, the molten data value column will be of type '$type'. All measure variables not of type '$type' will be coerced to. Check DETAILS in ?melt.data.table for more on coercion.

I think it would be better if my col list were truncated earlier so I could see the important part of the message.

[arunsrinivasan]

+1. Makes sense.