Question 1

How do I add go-runewidth to my Go project?

Accepted Answer

Install it using 'go get github.com/mattn/go-runewidth'. Then, import it in your code and use functions like runewidth.StringWidth("your string") as shown in the README example.

Question 2

Does go-runewidth handle emoji characters correctly?

Accepted Answer

It follows wcwidth() standards, which may not accurately account for all emoji, especially newer ones or zero-width joiners. You might need to update Unicode data or use additional libraries for full emoji support.

Question 3

What's the difference between go-runewidth and github.com/mitchellh/go-wordwrap?

Accepted Answer

go-runewidth focuses on measuring character display width in terminals, while go-wordwrap is for wrapping text into lines. They serve different purposes; go-runewidth is about width calculation, and go-wordwrap uses that for layout.

Question 4

Is go-runewidth compatible with Windows terminals?

Accepted Answer

Yes, it's cross-platform and should work on Windows, but terminal emulators like Command Prompt or PowerShell might have varying behavior, so testing is recommended for specific use cases.

Question 5

How to calculate the width of a string with mixed English and Japanese text?

Accepted Answer

Use the StringWidth() function, which automatically accounts for fullwidth characters. For example, runewidth.StringWidth("Hello 世界") will return the correct display width considering '世界' as two fullwidth characters.

Question 6

go-runewidth vs. using len() on strings in Go?

Accepted Answer

len() returns the number of bytes or runes, not the visual width. go-runewidth's StringWidth() gives the actual terminal columns needed, crucial for formatting text with variable-width characters like East Asian scripts.

go-runewidth

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