Re: vim function argument

Hi,

Yang Luo schrieb am 14.07.2016 um 12:06:
>
> I complete the function as follow, now I want to add radix option, but I don't know how to get width. Can you help me complement it
>
> function InsertNumber(start, end,...) " step,is_column_first_0_padding,radix(b,d,o,x)
> let l:i = a:start
> let l:curr_line = 0
> if a:0 == 0 " a:0 extra argument numbers
> let l:step = 1
> else
> let l:step = a:1 " the first extra argument
> endif
> if a:0 == 2
> let l:is_padding = 0
> else
> let l:is_padding = 1 "default padding
> endif
> if a:0 == 3
> let l:radix = a:3
> else
> let l:radix = ""
> endif
> if l:radix == "b"
> elseif l:radix == "o"
> elseif l:radix == "x"
> else
> let l:width = float2nr(trunc(log10(a:end))) + 1
> let l:format = '%0'.l:width.'d'
> endif
> while l:i <= a:end
> if l:step <= 0
> echo "Error: step cannot <= 0."
> break
> endif
> if l:is_padding == 1
> call append(curr_line, printf(l:format, l:i))
> else
> call append(curr_line, l:i)
> endif
> let l:i += l:step
> let l:curr_line += 1
> endwhile
> endfunction
>

there is an simpler way to calculate the necessary width -- just count
the number of characters used for the a:end parameter when printed:

let width = strlen(printf('%d', a:end))

This can also be used to calculate the width for other radices than 10:

if l:radix == "b"
let width = strlen(printf('%x', a:end)) * 4
elseif l:radix == "o"
let width = strlen(printf('%o', a:end))
elseif l:radix == "x"
let width = strlen(printf('%x', a:end))
else
let width = strlen(printf('%d', a:end))
endif

Note that there is no specification for output as a binary number in
printf().

Regards,
Jürgen

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