-
Notifications
You must be signed in to change notification settings - Fork 0
/
index.js
201 lines (171 loc) · 4.06 KB
/
index.js
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
'use strict';
const moment = require('moment');
const inspect = require('util').inspect;
const printf = require('util').format;
const colors = require('colors');
const emptyFn = function () {};
const useColor = Boolean(process.stdout.isTTY);
colors.setTheme({
error: 'red',
warn: 'yellow',
info: 'cyan',
debug: 'blue'
});
/**
* Parse filter of names & values to determine if they should be enabled or skipped.
* @param {String} type name,level
* @param {String} keys
* @param {String} enable
* @param {Object} skip
*/
function parseFilter(type, keys, enable, skip) {
if (!keys) {
enable.all[type] = true;
return;
}
enable.all[type] = false;
const split = keys.split(/[\s,]+/);
split.forEach((key) => {
if (!key) {
return;
}
key = key.trim();
if (key[0] === '-') {
skip[type][key.substring(1, key.length)] = true;
return;
}
if (key === '*') {
enable.all[type] = true;
return;
}
enable[type][key] = true;
});
}
/**
* Set color on string if colors is enabled
* @param {String} color color name
* @param {String} val
* @return {String}
*/
function colorize(color, val) {
if (!useColor || !colors[color]) {
return val;
}
return colors[color](val);
}
/**
* Check if output is enabled for a name and level
* @param {String} name
* @param {String} level
* @param {Object} enable
* @param {Object} skip
* @return {Boolean}
*/
function enabled(name, level, enable, skip) {
if ((name && skip.name[name]) || (level && skip.level[level])) {
return false;
}
if ((enable.all.name || enable.name[name]) &&
(enable.all.level || enable.level[level])) {
return true;
}
return false;
}
/**
* Default date formatter
* @return {String} current time
*/
function date() {
return moment().format('DD MMM HH:mm:ss');
}
/**
* Default writer, writes to console.log
* @param {String} msg
*/
function write(msg) {
console.log(msg);
}
/**
* Default formatter
* @param {Object} data
* @return {String}
*/
function format(data) {
const args = data.args.map((arg) => {
if (arg instanceof Error) {
return arg.stack;
}
if (arg instanceof Object) {
return inspect(arg, { colors: useColor });
}
return arg;
});
const msg = printf.apply(printf, args);
const fmt = ['%s'];
const vals = [colorize('grey', data.date)];
if (data.name) {
fmt.push('%s');
vals.push(data.name);
}
if (data.level) {
fmt.push('[%s]');
vals.push(colorize(data.level, data.level));
}
fmt.push('- %s');
vals.push(msg);
return printf.apply(printf, [fmt.join(' ')].concat(vals));
}
/**
* Create log functions
* @param {String} [name]
* @param {Object} [opts]
* @param {Function} [opts.date] custom date formatter
* @param {Function} [opts.format] custom formatter
* @param {Function} [opts.write] custom write function
* @param {String} [opts.levelFilter] defaults to process.env.LOGLEVELS
* @param {String} [opts.nameFilter] defaults to process.env.LOGNAMES
* @param {Array} [opts.levels] add custom levels
* @return {Function}
*/
function log(name, opts) {
if (typeof (name) === 'object') {
opts = name;
name = undefined;
} else {
opts = opts || {};
}
const dateFn = opts.date || date;
const formatFn = opts.format || format;
const writeFn = opts.write || write;
const levels = ['error', 'warn', 'info', 'debug'].concat(opts.levels || []);
const enable = { all: {}, name: {}, level: {} };
const skip = { name: {}, level: {} };
parseFilter('name', opts.nameFilter || process.env.LOGNAMES, enable, skip);
parseFilter('level', opts.levelFilter || process.env.LOGLEVELS, enable, skip);
const logger = function (level) {
if (!enabled(name, level, enable, skip)) {
return emptyFn;
}
return (...args) => {
writeFn(formatFn({
date: dateFn(),
name: name,
args: args || [],
level: level
}));
};
};
const fn = logger();
levels.forEach((level) => {
fn[level] = logger(level);
});
if (process.env.NODE_ENV === 'test') {
fn.enabled = function (name, level) {
return enabled(name, level, enable, skip);
};
}
return fn;
}
module.exports = function (name, opts) {
return log(name, opts);
};