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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',
},
});
//@
//@ ### grep([options,] regex_filter, file [, file ...])
//@ ### grep([options,] regex_filter, file_array)
//@ Available options:
//@
//@ + `-v`: Inverse the sense of the regex and print the lines not matching the criteria.
//@ + `-l`: Print only filenames of matching files
//@
//@ 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 = [];
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/);
if (options.nameOnly) {
if (contents.match(regex)) {
grep.push(file);
}
} else {
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;
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