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- var common = require('./common');
- var fs = require('fs');
- common.register('cat', _cat, {
- canReceivePipe: true,
- cmdOptions: {
- 'n': 'number',
- },
- });
- //@
- //@ ### cat([options,] file [, file ...])
- //@ ### cat([options,] file_array)
- //@
- //@ Available options:
- //@
- //@ + `-n`: number all output lines
- //@
- //@ Examples:
- //@
- //@ ```javascript
- //@ var str = cat('file*.txt');
- //@ var str = cat('file1', 'file2');
- //@ var str = cat(['file1', 'file2']); // same as above
- //@ ```
- //@
- //@ Returns a string containing the given file, or a concatenated string
- //@ containing the files if more than one file is given (a new line character is
- //@ introduced between each file).
- function _cat(options, files) {
- var cat = common.readFromPipe();
- if (!files && !cat) common.error('no paths given');
- files = [].slice.call(arguments, 1);
- files.forEach(function (file) {
- if (!fs.existsSync(file)) {
- common.error('no such file or directory: ' + file);
- } else if (common.statFollowLinks(file).isDirectory()) {
- common.error(file + ': Is a directory');
- }
- cat += fs.readFileSync(file, 'utf8');
- });
- if (options.number) {
- cat = addNumbers(cat);
- }
- return cat;
- }
- module.exports = _cat;
- function addNumbers(cat) {
- var lines = cat.split('\n');
- var lastLine = lines.pop();
- lines = lines.map(function (line, i) {
- return numberedLine(i + 1, line);
- });
- if (lastLine.length) {
- lastLine = numberedLine(lines.length + 1, lastLine);
- }
- lines.push(lastLine);
- return lines.join('\n');
- }
- function numberedLine(n, line) {
- // GNU cat use six pad start number + tab. See http://lingrok.org/xref/coreutils/src/cat.c#57
- // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/padStart
- var number = (' ' + n).slice(-6) + '\t';
- return number + line;
- }
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