fix runewidth_table.go

[gdrens]

If LANG="zh_CN.UTF8",the Tabs(0x2500-0x257F) will return 2,but should return 1

[mattn]

Which standard is defined for that?

[gdrens]

I use rxvt, this terminal is VT100 standard, if you mean to ask this. unicode (0x2500-0x257F) only occupies one character position in my terminal, but I have not tested it on more terminal standards

code:

package main

import ( "fmt" "syscall" "unsafe" )

func main() { var termDim [4]uint16 syscall.Syscall6(syscall.SYS_IOCTL, uintptr(0), uintptr(syscall.TIOCGWINSZ), uintptr(unsafe.Pointer(&termDim)), 0, 0, 0)

fmt.Println(termDim[1], termDim[0])
j := 0
for i := 0x2500; i < 0x2580; i++ {
    fmt.Printf("%c", i)
    j++
}
fmt.Println()
fmt.Println(j)

}

On Thu, Nov 25, 2021 at 09:43:51PM -0800, mattn wrote:

Which standard is defined for that?

[mattn]

That is not a specification. go-runewidth generate tables from Unicode specification.

[gdrens]

Yes, I know, but in the unicode specification, the screen width occupied by the tab character 0x2500～0x257F should be 1, but now the returned value is 2

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