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Viewing file:     wrap.js (2.46 KB)      -rw-r--r--

// Wrap
// wraps a string by a certain width

var makeString = require('./helper/makeString');

module.exports = function wrap(str, options){
  str = makeString(str);
  
  options = options || {};
  
  var width = options.width || 75;
  var seperator = options.seperator || '\n';
  var cut = options.cut || false;
  var preserveSpaces = options.preserveSpaces || false;
  var trailingSpaces = options.trailingSpaces || false;
  
  var result;
  
  if(width <= 0){
    return str;
  }
  
  else if(!cut){
  
    var words = str.split(' ');
    var current_column = 0;
    result = '';
  
    while(words.length > 0){
      
      // if adding a space and the next word would cause this line to be longer than width...
      if(1 + words[0].length + current_column > width){
        //start a new line if this line is not already empty
        if(current_column > 0){
          // add a space at the end of the line is preserveSpaces is true
          if (preserveSpaces){
            result += ' ';
            current_column++;
          }
          // fill the rest of the line with spaces if trailingSpaces option is true
          else if(trailingSpaces){
            while(current_column < width){
              result += ' ';
              current_column++;
            }            
          }
          //start new line
          result += seperator;
          current_column = 0;
        }
      }
  
      // if not at the begining of the line, add a space in front of the word
      if(current_column > 0){
        result += ' ';
        current_column++;
      }
  
      // tack on the next word, update current column, a pop words array
      result += words[0];
      current_column += words[0].length;
      words.shift();
  
    }
  
    // fill the rest of the line with spaces if trailingSpaces option is true
    if(trailingSpaces){
      while(current_column < width){
        result += ' ';
        current_column++;
      }            
    }
  
    return result;
  
  }
  
  else {
  
    var index = 0;
    result = '';
  
    // walk through each character and add seperators where appropriate
    while(index < str.length){
      if(index % width == 0 && index > 0){
        result += seperator;
      }
      result += str.charAt(index);
      index++;
    }
  
    // fill the rest of the line with spaces if trailingSpaces option is true
    if(trailingSpaces){
      while(index % width > 0){
        result += ' ';
        index++;
      }            
    }
    
    return result;
  }
};