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
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
|
// MIT License
// Copyright (c) Sindre Sorhus <sindresorhus@gmail.com> (sindresorhus.com)
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
'use strict';
const {
ERR_INVALID_ARG_TYPE,
ERR_OUT_OF_RANGE
} = require('internal/errors').codes;
let OSRelease;
const COLORS_2 = 1;
const COLORS_16 = 4;
const COLORS_256 = 8;
const COLORS_16m = 24;
// Some entries were taken from `dircolors`
// (https://linux.die.net/man/1/dircolors). The corresponding terminals might
// support more than 16 colors, but this was not tested for.
//
// Copyright (C) 1996-2016 Free Software Foundation, Inc. Copying and
// distribution of this file, with or without modification, are permitted
// provided the copyright notice and this notice are preserved.
const TERM_ENVS = {
'eterm': COLORS_16,
'cons25': COLORS_16,
'console': COLORS_16,
'cygwin': COLORS_16,
'dtterm': COLORS_16,
'gnome': COLORS_16,
'hurd': COLORS_16,
'jfbterm': COLORS_16,
'konsole': COLORS_16,
'kterm': COLORS_16,
'mlterm': COLORS_16,
'mosh': COLORS_16m,
'putty': COLORS_16,
'st': COLORS_16,
// https://github.com/da-x/rxvt-unicode/tree/v9.22-with-24bit-color
'rxvt-unicode-24bit': COLORS_16m,
// https://gist.github.com/XVilka/8346728#gistcomment-2823421
'terminator': COLORS_16m
};
const TERM_ENVS_REG_EXP = [
/ansi/,
/color/,
/linux/,
/^con[0-9]*x[0-9]/,
/^rxvt/,
/^screen/,
/^xterm/,
/^vt100/
];
function warnOnDeactivatedColors(env) {
let name;
if (env.NODE_DISABLE_COLORS !== undefined)
name = 'NODE_DISABLE_COLORS';
if (env.NO_COLOR !== undefined)
name = 'NO_COLOR';
if (name !== undefined) {
process.emitWarning(
`The '${name}' env is ignored due to the 'FORCE_COLOR' env being set.`,
'Warning'
);
}
}
// The `getColorDepth` API got inspired by multiple sources such as
// https://github.com/chalk/supports-color,
// https://github.com/isaacs/color-support.
function getColorDepth(env = process.env) {
// Use level 0-3 to support the same levels as `chalk` does. This is done for
// consistency throughout the ecosystem.
if (env.FORCE_COLOR !== undefined) {
switch (env.FORCE_COLOR) {
case '':
case '1':
case 'true':
warnOnDeactivatedColors(env);
return COLORS_16;
case '2':
warnOnDeactivatedColors(env);
return COLORS_256;
case '3':
warnOnDeactivatedColors(env);
return COLORS_16m;
default:
return COLORS_2;
}
}
if (env.NODE_DISABLE_COLORS !== undefined ||
// See https://no-color.org/
env.NO_COLOR !== undefined ||
// The "dumb" special terminal, as defined by terminfo, doesn't support
// ANSI color control codes.
// See http://invisible-island.net/ncurses/terminfo.ti.html#toc-_Specials
env.TERM === 'dumb') {
return COLORS_2;
}
if (process.platform === 'win32') {
// Lazy load for startup performance.
if (OSRelease === undefined) {
const { release } = require('os');
OSRelease = release().split('.');
}
// Windows 10 build 10586 is the first Windows release that supports 256
// colors. Windows 10 build 14931 is the first release that supports
// 16m/TrueColor.
if (+OSRelease[0] >= 10) {
const build = +OSRelease[2];
if (build >= 14931)
return COLORS_16m;
if (build >= 10586)
return COLORS_256;
}
return COLORS_16;
}
if (env.TMUX) {
return COLORS_256;
}
if (env.CI) {
if ('TRAVIS' in env || 'CIRCLECI' in env || 'APPVEYOR' in env ||
'GITLAB_CI' in env || env.CI_NAME === 'codeship') {
return COLORS_256;
}
return COLORS_2;
}
if ('TEAMCITY_VERSION' in env) {
return /^(9\.(0*[1-9]\d*)\.|\d{2,}\.)/.test(env.TEAMCITY_VERSION) ?
COLORS_16 : COLORS_2;
}
switch (env.TERM_PROGRAM) {
case 'iTerm.app':
if (!env.TERM_PROGRAM_VERSION ||
/^[0-2]\./.test(env.TERM_PROGRAM_VERSION)) {
return COLORS_256;
}
return COLORS_16m;
case 'HyperTerm':
case 'MacTerm':
return COLORS_16m;
case 'Apple_Terminal':
return COLORS_256;
}
if (env.TERM) {
if (/^xterm-256/.test(env.TERM))
return COLORS_256;
const termEnv = env.TERM.toLowerCase();
if (TERM_ENVS[termEnv]) {
return TERM_ENVS[termEnv];
}
for (const term of TERM_ENVS_REG_EXP) {
if (term.test(termEnv)) {
return COLORS_16;
}
}
}
if (env.COLORTERM) {
if (env.COLORTERM === 'truecolor' || env.COLORTERM === '24bit')
return COLORS_16m;
return COLORS_16;
}
return COLORS_2;
}
function hasColors(count, env) {
if (env === undefined &&
(count === undefined || typeof count === 'object' && count !== null)) {
env = count;
count = 16;
} else {
if (typeof count !== 'number') {
throw new ERR_INVALID_ARG_TYPE('count', 'number', count);
}
if (count < 2) {
throw new ERR_OUT_OF_RANGE('count', '>= 2', count);
}
}
return count <= 2 ** getColorDepth(env);
}
module.exports = {
getColorDepth,
hasColors
};
|
