Ruby printing line numbers -


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i'm trying check file line line starting white space. want lines start space or tab not both. if there line starts space , anthers line starts tab in file code below going print warning, on top of want print 2 lines 1 starts space , 1 starts tab show user, , im stuck on how line numbers , stuff. help!! code looks far.

    file= file.read("file_tobe_checked")     tabs = spaces = false     file.each |line|      line =~ /^\t/ , tabs = true     line =~ /^ / , spaces = true        if spaces , tabs     stderr <<  "the white spaces @ beginning of each line not consistent.\n"      end     end

ruby has number of special variables, 1 of $. read line's number.

you can use io's lineno method.

io.lineno  (from ruby core) ------------------------------------------------------------------------------   ios.lineno    -> integer  ------------------------------------------------------------------------------  returns current line number in ios.  stream must opened reading. lineno counts number of times #gets called rather number of newlines encountered.  2 values differ if #gets called separator other newline.  methods use $/ #each, #lines , #readline increment lineno.  see $. variable.    f = file.new("testfile")   f.lineno   #=> 0   f.gets     #=> "this line one\n"   f.lineno   #=> 1   f.gets     #=> "this line two\n"   f.lineno   #=> 2

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