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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 `files` 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(/\r*\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;
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