Re: Unexpected indentation with :left

On Wed, Feb 26, 2025 at 7:44 PM Tim Chase <[email protected]> wrote:

>
> The gist of my question/hope was wanting to get the N in
>
>   :left N
>
> to prepend N *indents* (using N tabs if 'noet' and N*shiftwidth if 'et'
> is set)
>
> As it currently stands, with 'et' set, I get N spaces, not N
> 'shiftwidth', and if I have 'noet' set, I get int(N/tabstop) tabs
> followed by mod(N, tabstop) spaces.  E.g.
>
>   :set ts=8 sw=4
>
> with
>
>   :set et
>   :'<,'>left 10
>
> puts 10 spaces at the beginning of each trimmed line.
>
> And without 'et' set:
>
>   :set noet
>   :'<,'>left 10
>
> gives me one tab (8-worth) followed by 2 spaces.
>
> Neither gives me 10 tabstops or 10 shiftwidths which is what I'd
> expected.
>
> -tim
>

This seemed like it might be useful, so I wrote it:

# Different from regular :left in that the indent is taken to be a multiple
of the &shiftwidth setting and not just a number of spaces.
export def g:LeftIndentLines( line1: number, line2: number, indent: string )
  var indentSize: number = indent == '' ? 0 : str2nr( indent )

  if ( indentSize > 0 )
    # Replace existing indent with the number of spaces required
    execute $':{line1},{line2}s/^\s*/{repeat(" ", indentSize *
&shiftwidth)}'

    # Use retab to insert tabs if tab-based indentation is enabled3
    execute $':{line1},{line2}retab!'
  else
    execute $':{line1},{line2}left'
  endif
enddef
com! -nargs=? -range Left g:LeftIndentLines( <line1>, <line2>, <q-args> )

Call just like the regular :left, except with :Left. Takes a range and an
indent (default is 0, just like regular :left). The only difference between
this and the built in version is that the number passed to this is seen as
a multiple of the shiftwidth instead of an absolute number of spaces. It
will also call `retab!` to convert indents to tabs as needed.

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