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| var async = require('async');
var stream = require('stream-wrapper');
var noansi = require('ansi-stripper');
require('colors');
var PROGRESS_BAR_LENGTH = 50;
var TABLE_CELL_PADDING = 2;
var OUTPUT_PADDING = 10;
var bar = function(percent) {
percent = Math.min(percent, 100);
var bar = '';
var limit = Math.floor(percent / 100 * PROGRESS_BAR_LENGTH);
var i;
for(i = 0; i < limit; i++) {
bar += '=';
}
if(limit < PROGRESS_BAR_LENGTH) {
bar += '>';
limit++;
}
for(i = limit; i < PROGRESS_BAR_LENGTH; i++) {
bar += ' ';
}
return '[' + bar.bold.cyan + ']';
};
var table = function(table) {
var columnLengths = [];
var each = function(fn) {
for(var i = 0; i < table.length; i++) {
var row = table[i];
for(var j = 0; j < row.length; j++) {
fn(i, j, row[j]);
}
}
};
var padding = function(padding) {
var result = '';
for(var i = 0; i < padding; i++) {
result += ' ';
}
return result;
};
var length = function(obj) {
return noansi(obj.toString()).length;
};
each(function(i, j, value) {
columnLengths[j] = Math.max(columnLengths[j] || 0, length(value));
});
each(function(i, j, value) {
table[i][j] = value + padding(columnLengths[j] - length(value) + TABLE_CELL_PADDING);
});
return table.map(function(row) {
return row.join(padding(TABLE_CELL_PADDING * 2));
});
};
var time = function(time) {
time = time / 1000;
var hours = Math.floor(time / 3600);
var minutes = Math.floor((time - (hours * 3600)) / 60);
var seconds = Math.floor(time - (hours * 3600) - (minutes * 60));
return hours + 'h ' + minutes + 'm ' + seconds + 's';
};
var sign = function(number) {
if(!number) {
return ' 0';
}
return number < 0 ? number.toString() : ('+' + number);
};
var progress = function(count, log) {
var current = 0;
var output = [];
var started = Date.now();
var logProgress = function(current, progress, diff) {
var hasDiff = diff;
process.stdout.moveCursor(0, -output.length);
diff = Object.keys(diff || {}).map(function(key) {
return [key, sign(diff[key].added).green, diff[key].updated.toString().yellow, sign(-diff[key].removed).red];
});
diff = diff.length ? diff : [[ '(No changes)' ]];
diff.forEach(function(row) {
row.unshift('');
});
diff.unshift(['Diff: '.grey, '', 'added'.grey, 'updated'.grey, 'removed'.grey]);
output = hasDiff ? table(diff) : [];
output.unshift('Patch: '.grey + log.collection);
output.unshift('Progress: '.grey + bar(progress) + ' ' + current + '/' + count + ' ' + progress.toFixed(1) + '%');
if(output.length > process.stdout.rows - OUTPUT_PADDING) {
output = output.slice(0, process.stdout.rows - OUTPUT_PADDING);
output.push(' ...');
}
console.log(output.join('\n'));
};
logProgress(0, !count ? 100 : 0);
return stream.transform({ objectMode: true }, function(patch, enc, callback) {
var progress = 100 * (++current) / count;
logProgress(current, progress, patch.diff.accumulated);
callback(null, patch);
}, function(callback) {
stats(log, Date.now() - started, callback);
});
};
var stats = function(log, t, callback) {
var count = function(query) {
return function(callback) {
if(!log.db) {
return callback(null, 0);
}
log.db.collection(log.collection).count(query || {}, callback);
};
};
async.parallel({
modified: count({ modified: true }),
total: count()
}, function(err, results) {
if(err){
return callback(err);
}
console.log('');
table([
['Summary:'.grey, 'Time', time(t)],
['', 'Modified', results.modified, '(rest ' + (results.total - results.modified) + ')'],
['', 'Total', results.total]
]).forEach(function(line) {
console.log(line);
});
console.log('');
return callback();
});
};
module.exports = progress;
|