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Viewing file:     sed.js (2.21 KB)      -rw-r--r--

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

common.register('sed', _sed, {
  globStart: 3, // don't glob-expand regexes
  canReceivePipe: true,
  cmdOptions: {
    'i': 'inplace',
  },
});

//@
//@ ### sed([options,] search_regex, replacement, file [, file ...])
//@ ### sed([options,] search_regex, replacement, file_array)
//@
//@ Available options:
//@
//@ + `-i`: Replace contents of `file` in-place. _Note that no backups will be created!_
//@
//@ Examples:
//@
//@ ```javascript
//@ sed('-i', 'PROGRAM_VERSION', 'v0.1.3', 'source.js');
//@ sed(/.*DELETE_THIS_LINE.*\n/, '', 'source.js');
//@ ```
//@
//@ Reads an input string from `file`s, and performs a JavaScript `replace()` on the input
//@ using the given `search_regex` and `replacement` string or function. Returns the new string after replacement.
//@
//@ Note:
//@
//@ Like unix `sed`, ShellJS `sed` supports capture groups. Capture groups are specified
//@ using the `$n` syntax:
//@
//@ ```javascript
//@ sed(/(\w+)\s(\w+)/, '$2, $1', 'file.txt');
//@ ```
function _sed(options, regex, replacement, files) {
  // Check if this is coming from a pipe
  var pipe = common.readFromPipe();

  if (typeof replacement !== 'string' && typeof replacement !== 'function') {
    if (typeof replacement === 'number') {
      replacement = replacement.toString(); // fallback
    } else {
      common.error('invalid replacement string');
    }
  }

  // Convert all search strings to RegExp
  if (typeof regex === 'string') {
    regex = RegExp(regex);
  }

  if (!files && !pipe) {
    common.error('no files given');
  }

  files = [].slice.call(arguments, 3);

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

  var sed = [];
  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');
    var lines = contents.split('\n');
    var result = lines.map(function (line) {
      return line.replace(regex, replacement);
    }).join('\n');

    sed.push(result);

    if (options.inplace) {
      fs.writeFileSync(file, result, 'utf8');
    }
  });

  return sed.join('\n');
}
module.exports = _sed;