1  'use strict';
 2  const supportsColor = require('supports-color');
 3  const hasFlag = require('has-flag');
 4  
 5  function parseVersion(versionString) {
 6  	if (/^\d{3,4}$/.test(versionString)) {
 7  		// Env var doesn't always use dots. example: 4601 => 46.1.0
 8  		const m = /(\d{1,2})(\d{2})/.exec(versionString);
 9  		return {
10  			major: 0,
11  			minor: parseInt(m[1], 10),
12  			patch: parseInt(m[2], 10)
13  		};
14  	}
15  
16  	const versions = (versionString || '').split('.').map(n => parseInt(n, 10));
17  	return {
18  		major: versions[0],
19  		minor: versions[1],
20  		patch: versions[2]
21  	};
22  }
23  
24  function supportsHyperlink(stream) {
25  	const {env} = process;
26  
27  	if ('FORCE_HYPERLINK' in env) {
28  		return !(env.FORCE_HYPERLINK.length > 0 && parseInt(env.FORCE_HYPERLINK, 10) === 0);
29  	}
30  
31  	if (hasFlag('no-hyperlink') || hasFlag('no-hyperlinks') || hasFlag('hyperlink=false') || hasFlag('hyperlink=never')) {
32  		return false;
33  	}
34  
35  	if (hasFlag('hyperlink=true') || hasFlag('hyperlink=always')) {
36  		return true;
37  	}
38  
39  	// If they specify no colors, they probably don't want hyperlinks.
40  	if (!supportsColor.supportsColor(stream)) {
41  		return false;
42  	}
43  
44  	if (stream && !stream.isTTY) {
45  		return false;
46  	}
47  
48  	if (process.platform === 'win32') {
49  		return false;
50  	}
51  
52  	if ('NETLIFY' in env) {
53  		return true;
54  	}
55  
56  	if ('CI' in env) {
57  		return false;
58  	}
59  
60  	if ('TEAMCITY_VERSION' in env) {
61  		return false;
62  	}
63  
64  	if ('TERM_PROGRAM' in env) {
65  		const version = parseVersion(env.TERM_PROGRAM_VERSION);
66  
67  		switch (env.TERM_PROGRAM) {
68  			case 'iTerm.app':
69  				if (version.major === 3) {
70  					return version.minor >= 1;
71  				}
72  
73  				return version.major > 3;
74  			// No default
75  		}
76  	}
77  
78  	if ('VTE_VERSION' in env) {
79  		// 0.50.0 was supposed to support hyperlinks, but throws a segfault
80  		if (env.VTE_VERSION === '0.50.0') {
81  			return false;
82  		}
83  
84  		const version = parseVersion(env.VTE_VERSION);
85  		return version.major > 0 || version.minor >= 50;
86  	}
87  
88  	return false;
89  }
90  
91  module.exports = {
92  	supportsHyperlink,
93  	stdout: supportsHyperlink(process.stdout),
94  	stderr: supportsHyperlink(process.stderr)
95  };