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Viewing file:     grep.js (1.79 KB)      -rw-r--r--

var common = require('./common');
var fs = require('fs');

common.register('grep', _grep, {
  globStart: 2, // don't glob-expand the regex
  canReceivePipe: true,
  cmdOptions: {
    'v': 'inverse',
    'l': 'nameOnly',
    'i': 'ignoreCase',
  },
});

//@
//@ ### grep([options,] regex_filter, file [, file ...])
//@ ### grep([options,] regex_filter, file_array)
//@
//@ Available options:
//@
//@ + `-v`: Invert `regex_filter` (only print non-matching lines).
//@ + `-l`: Print only filenames of matching files.
//@ + `-i`: Ignore case.
//@
//@ Examples:
//@
//@ ```javascript
//@ grep('-v', 'GLOBAL_VARIABLE', '*.js');
//@ grep('GLOBAL_VARIABLE', '*.js');
//@ ```
//@
//@ Reads input string from given files and returns a string containing all lines of the
//@ file that match the given `regex_filter`.
function _grep(options, regex, files) {
  // Check if this is coming from a pipe
  var pipe = common.readFromPipe();

  if (!files && !pipe) common.error('no paths given', 2);

  files = [].slice.call(arguments, 2);

  if (pipe) {
    files.unshift('-');
  }

  var grep = [];
  if (options.ignoreCase) {
    regex = new RegExp(regex, 'i');
  }
  files.forEach(function (file) {
    if (!fs.existsSync(file) && file !== '-') {
      common.error('no such file or directory: ' + file, 2, { continue: true });
      return;
    }

    var contents = file === '-' ? pipe : fs.readFileSync(file, 'utf8');
    if (options.nameOnly) {
      if (contents.match(regex)) {
        grep.push(file);
      }
    } else {
      var lines = contents.split('\n');
      lines.forEach(function (line) {
        var matched = line.match(regex);
        if ((options.inverse && !matched) || (!options.inverse && matched)) {
          grep.push(line);
        }
      });
    }
  });

  return grep.join('\n') + '\n';
}
module.exports = _grep;