ce4c83ff
 wxy
初始提交
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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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