Pattern specifiers for abbreviated logger and class names

[Curt Arnold]

I wanted to get opinions on adding support in the pattern layout for 
abbreviated forms of the logger and class names.   Fully qualified 
class names and logger names typically are fairly long and could be 
usually be radically abbreviated with little loss of information.  For 
example, a logger name of "com.example.foobar.Widget" could be 
abbreviated "c.e.f.Widget".

The current options for shortening the names are use of a width 
specifier. for example, "%10c" which result in "com.exampl" and path 
element count, for example, "$c{2}" which would result in 
"foobar.Widget".

There are a couple of approaches:
a) use abbreviation instead of truncation to meet width specifier.  
"%10c" of "%10logger" would result in "c.e.f.Wdgt".  Names shorter than 
the width specifier would be fully expressed.

b) Add a "%shortlogger" (and shortclass) conversion specifier to 
complement the existing and equivalent "%logger" and "%c" specifier.  
%shortlogger would always abbreviate even if the logger name could fit 
in available width and width would still be right truncation.

c) Abbreviate output of "%logger" and %class and add "%fulllogger" and 
"%fullclass" to be equivalent with existing specifiers.

d) Add an additional parameter to the existing format specifiers to 
indicate abbreviation, for example, %c{2}{true}" might output 
"f.Widget".

Any other options, thoughts or preferences?

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