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9237f66c52
No change to logic, only docs. In v0.7.0, we introduced ShellStrings and changed most methods to return them. Docs weren't appropriately updated, so this PR cross-links these methods to the ShellString docs. This also expands on the ShellString docs themselves, since there was room to make this clearer. Fixes #933
79 lines
2.0 KiB
JavaScript
79 lines
2.0 KiB
JavaScript
var common = require('./common');
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var fs = require('fs');
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common.register('grep', _grep, {
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globStart: 2, // don't glob-expand the regex
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canReceivePipe: true,
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cmdOptions: {
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'v': 'inverse',
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'l': 'nameOnly',
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'i': 'ignoreCase',
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},
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});
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//@
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//@ ### grep([options,] regex_filter, file [, file ...])
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//@ ### grep([options,] regex_filter, file_array)
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//@
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//@ Available options:
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//@
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//@ + `-v`: Invert `regex_filter` (only print non-matching lines).
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//@ + `-l`: Print only filenames of matching files.
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//@ + `-i`: Ignore case.
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//@
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//@ Examples:
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//@
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//@ ```javascript
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//@ grep('-v', 'GLOBAL_VARIABLE', '*.js');
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//@ grep('GLOBAL_VARIABLE', '*.js');
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//@ ```
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//@
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//@ Reads input string from given files and returns a
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//@ [ShellString](#shellstringstr) containing all lines of the @ file that match
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//@ the given `regex_filter`.
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function _grep(options, regex, 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 (!files && !pipe) common.error('no paths given', 2);
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files = [].slice.call(arguments, 2);
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if (pipe) {
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files.unshift('-');
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}
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var grep = [];
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if (options.ignoreCase) {
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regex = new RegExp(regex, 'i');
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}
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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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if (options.nameOnly) {
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if (contents.match(regex)) {
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grep.push(file);
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}
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} else {
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var lines = contents.split('\n');
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lines.forEach(function (line) {
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var matched = line.match(regex);
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if ((options.inverse && !matched) || (!options.inverse && matched)) {
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grep.push(line);
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}
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});
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}
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});
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if (grep.length === 0 && common.state.errorCode !== 2) {
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// We didn't hit the error above, but pattern didn't match
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common.error('', { silent: true });
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}
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return grep.join('\n') + '\n';
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}
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module.exports = _grep;
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