hr-with-string.1.awk

#! /usr/local/bin/awk -f

# Examples:
#   ls -1 | ./hr-with-string.1.awk
#   ls -1 | ./hr-with-string.1.awk -v pad=30
#   ls -1 | ./hr-with-string.1.awk -v pad=30 -v hr='-'
#   ls -1 | ./hr-with-string.1.awk -v pad=30 -v hr='><'

function center( str, a, left, right ){
  right = int(( CFG[ pad ] - length(str)) / 2)

  left = CFG[ pad ] - length(str) - right

  return sprintf( "%" left "s%s%" right "s", "", str, "" )
}

function center_hr( str, hr_len ){
  if ( ! hr_len ) hr_len = CFG[ pad ]

  hr_right = sprintf( "%"hr_len"s","" )

  hr_left = sprintf( "%"hr_len"s","" )

  gsub( / /, CFG[ hr_l ], hr_left )

  gsub( / /, CFG[ hr_r ], hr_right )

  print hr_left center( str, 30 ) hr_right
}

BEGIN {
  printf( "%-6s | %-15s : %s\n", "BEGIN", "padding", padding )
  printf( "%-6s | %-15s : %s\n", "BEGIN", "pad", pad )
  printf( "%-6s | %-15s : %s\n", "BEGIN", "char", char )
  printf( "%-6s | %-15s : %s\n", "BEGIN", "hr", hr )

  if ( padding )  CFG[ pad ] = padding
  else if( pad )  CFG[ pad ] = pad
  else            CFG[ pad ] = 10

  if ( char )   CFG[ hr ] = char
  else if( hr ) CFG[ hr ] = hr
  else          CFG[ hr ] = "-"

  if ( length( CFG[ hr ] ) == 1 ){
    CFG[ hr_l ] = CFG[ hr ]
    CFG[ hr_r ] = CFG[ hr ]
  }
  else if ( length( CFG[ hr ] ) == 2 ){
  #else {
    CFG[ hr_l ] = substr( CFG[ hr ], 1, 1 )
    CFG[ hr_r ] = substr( CFG[ hr ], 2, 1 )
  }
  print "CFG[ hr_l ]:",CFG[ hr_l ]
  print "CFG[ hr_r ]:",CFG[ hr_r ]

  printf( "%-15s : %s\n", "length( CFG[ hr ])", length( CFG[ hr ]) )
  #print hr center( "Something I want to print", 30 ) hr
  #print hr center( "foo", 30 ) hr
  #print hr center( "FOO BAR baz", 30 ) hr
}
{
  center_hr( $0 )
}