2a09d1a4
 liuqimichale
添加宜春 天水 宣化
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var common = require('./common');
var fs = require('fs');
// add c spaces to the left of str
function lpad(c, str) {
var res = '' + str;
if (res.length < c) {
res = Array((c - res.length) + 1).join(' ') + res;
}
return res;
}
common.register('uniq', _uniq, {
canReceivePipe: true,
cmdOptions: {
'i': 'ignoreCase',
'c': 'count',
'd': 'duplicates',
},
});
//@
//@ ### uniq([options,] [input, [output]])
//@ Available options:
//@
//@ + `-i`: Ignore case while comparing
//@ + `-c`: Prefix lines by the number of occurrences
//@ + `-d`: Only print duplicate lines, one for each group of identical lines
//@
//@ Examples:
//@
//@ ```javascript
//@ uniq('foo.txt');
//@ uniq('-i', 'foo.txt');
//@ uniq('-cd', 'foo.txt', 'bar.txt');
//@ ```
//@
//@ Filter adjacent matching lines from input
function _uniq(options, input, output) {
// Check if this is coming from a pipe
var pipe = common.readFromPipe();
if (!pipe) {
if (!input) common.error('no input given');
if (!fs.existsSync(input)) {
common.error(input + ': No such file or directory');
} else if (fs.statSync(input).isDirectory()) {
common.error("error reading '" + input + "'");
}
}
if (output && fs.existsSync(output) && fs.statSync(output).isDirectory()) {
common.error(output + ': Is a directory');
}
var lines = (input ? fs.readFileSync(input, 'utf8') : pipe).
trimRight().
split(/\r*\n/);
var compare = function (a, b) {
return options.ignoreCase ?
a.toLocaleLowerCase().localeCompare(b.toLocaleLowerCase()) :
a.localeCompare(b);
};
var uniqed = lines.reduceRight(function (res, e) {
// Perform uniq -c on the input
if (res.length === 0) {
return [{ count: 1, ln: e }];
} else if (compare(res[0].ln, e) === 0) {
return [{ count: res[0].count + 1, ln: e }].concat(res.slice(1));
} else {
return [{ count: 1, ln: e }].concat(res);
}
}, []).filter(function (obj) {
// Do we want only duplicated objects?
return options.duplicates ? obj.count > 1 : true;
}).map(function (obj) {
// Are we tracking the counts of each line?
return (options.count ? (lpad(7, obj.count) + ' ') : '') + obj.ln;
}).join('\n') + '\n';
if (output) {
(new common.ShellString(uniqed)).to(output);
// if uniq writes to output, nothing is passed to the next command in the pipeline (if any)
return '';
} else {
return uniqed;
}
}
module.exports = _uniq;
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