From: Bjorn Pettersen <BPettersen@...>
Date: 2001-07-27T02:52:05+09:00
Subject: [ruby-talk:18583] My first Ruby program... :-)

Well, it's now two days into playing with Ruby, and I wrote my first
non-trivial program (it's converting a large c++ enum to constants). I'm
still shaky on idiomatic usage, so if any of the initiated would care to
comment on coding style I would be very grateful.

-- bjorn

# small class to take a list of lists of strings
# and output them in nicely adjusted columns
class StringTable
    def initialize(table)
        @table = table
        @ncols = table[0].length
        @maxcols = [].fill(0, 0...@ncols)
        
        #create a vector of max lenghts of each column
        @table.each {|row|
            (0...row.length).each {|i|
                @maxcols[i] = [row[i].length, @maxcols[i]].max
            }
        }
    end
    
    def output
        # create the format specifier
        fmt = ''
        (0...@maxcols.length).each {|n|
            fmt += "%-#{@maxcols[n]+1}s"
        }
        fmt += "\n"
        
        @table.each {|row|
            printf(fmt, *row)
        }
    end
end

def test
    lst = []
    IO.foreach('geneid.in') {|line|
        if line =~ /\s*(\w+)\s*=\s*(\d+)/
            lst << ['const long', $1, '=', $2+';']
        end
    }        

    st = StringTable.new(lst)
    st.output
end            

test