87 lines
2.2 KiB
JavaScript
87 lines
2.2 KiB
JavaScript
var common = require('./common');
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var fs = require('fs');
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common.register('sed', _sed, {
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globStart: 3, // don't glob-expand regexes
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canReceivePipe: true,
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cmdOptions: {
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'i': 'inplace',
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},
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});
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//@
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//@ ### sed([options,] search_regex, replacement, file [, file ...])
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//@ ### sed([options,] search_regex, replacement, file_array)
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//@ Available options:
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//@
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//@ + `-i`: Replace contents of 'file' in-place. _Note that no backups will be created!_
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//@
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//@ Examples:
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//@
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//@ ```javascript
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//@ sed('-i', 'PROGRAM_VERSION', 'v0.1.3', 'source.js');
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//@ sed(/.*DELETE_THIS_LINE.*\n/, '', 'source.js');
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//@ ```
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//@
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//@ Reads an input string from `files` and performs a JavaScript `replace()` on the input
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//@ using the given search regex and replacement string or function. Returns the new string after replacement.
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//@
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//@ Note:
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//@
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//@ Like unix `sed`, ShellJS `sed` supports capture groups. Capture groups are specified
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//@ using the `$n` syntax:
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//@
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//@ ```javascript
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//@ sed(/(\w+)\s(\w+)/, '$2, $1', 'file.txt');
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//@ ```
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function _sed(options, regex, replacement, files) {
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// Check if this is coming from a pipe
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var pipe = common.readFromPipe();
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if (typeof replacement !== 'string' && typeof replacement !== 'function') {
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if (typeof replacement === 'number') {
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replacement = replacement.toString(); // fallback
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} else {
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common.error('invalid replacement string');
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}
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}
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// Convert all search strings to RegExp
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if (typeof regex === 'string') {
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regex = RegExp(regex);
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}
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if (!files && !pipe) {
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common.error('no files given');
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}
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files = [].slice.call(arguments, 3);
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if (pipe) {
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files.unshift('-');
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}
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var sed = [];
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files.forEach(function (file) {
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if (!fs.existsSync(file) && file !== '-') {
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common.error('no such file or directory: ' + file, 2, { continue: true });
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return;
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}
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var contents = file === '-' ? pipe : fs.readFileSync(file, 'utf8');
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var lines = contents.split(/\r*\n/);
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var result = lines.map(function (line) {
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return line.replace(regex, replacement);
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}).join('\n');
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sed.push(result);
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if (options.inplace) {
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fs.writeFileSync(file, result, 'utf8');
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}
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});
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return sed.join('\n');
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}
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module.exports = _sed;
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