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44 lines
1.4 KiB
Markdown
44 lines
1.4 KiB
Markdown
has-unicode
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===========
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Try to guess if your terminal supports unicode
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```javascript
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var hasUnicode = require("has-unicode")
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if (hasUnicode()) {
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// the terminal probably has unicode support
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}
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```
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```javascript
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var hasUnicode = require("has-unicode").tryHarder
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hasUnicode(function(unicodeSupported) {
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if (unicodeSupported) {
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// the terminal probably has unicode support
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}
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})
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```
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## Detecting Unicode
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What we actually detect is UTF-8 support, as that's what Node itself supports.
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If you have a UTF-16 locale then you won't be detected as unicode capable.
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### Windows
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Since at least Windows 7, `cmd` and `powershell` have been unicode capable,
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but unfortunately even then it's not guaranteed. In many localizations it
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still uses legacy code pages and there's no facility short of running
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programs or linking C++ that will let us detect this. As such, we
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report any Windows installation as NOT unicode capable, and recommend
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that you encourage your users to override this via config.
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### Unix Like Operating Systems
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We look at the environment variables `LC_ALL`, `LC_CTYPE`, and `LANG` in
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that order. For `LC_ALL` and `LANG`, it looks for `.UTF-8` in the value.
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For `LC_CTYPE` it looks to see if the value is `UTF-8`. This is sufficient
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for most POSIX systems. While locale data can be put in `/etc/locale.conf`
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as well, AFAIK it's always copied into the environment.
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