Re: help with map(), please!

Am 28.11.2020 um 01:05 schrieb Charles Campbell:
> I'm having a bit of a problem with map(). I've had problems with map()
> before, and consequently I really really hate to use it.
> Here goes:
>
> 1: construct a comment:
>
> " Testing: one two | three four | five | six |
> " seven | eight |;
>
> 2. grab characters:
>
> fo<ctrl-v>j$"ay
>
> 3. convert to list:
>
> let list= split(@a,'\s*|\s*;\=',' ')

" convert newlines, then split ...
let list1 = split(tr(@a, "\n", " "), '\s*|\s*;\=')

> 4. Now, try to use map():
>
> call map(list,"substitute(v:val,'<&>','','ge')")

" (using copy() below is for easier debugging ...)

" you somehow did not check the substitute() arguments ...
let list2a = map(copy(list1), "substitute(v:val, '.*', '<&>', 'g')")

" the same, but avoiding inner quotes with lambda:
let list2b = map(copy(list1), {_, s -> substitute(s, '.*', '<&>', 'g')})
" ^
" |
" Note: do not forget THIS goiter argument

" Or what I actually do: define convenience functions, like this one:

" Msubstitute({lod}, {pat}, {repl}, {flags}[, ...])
"
" "map substitute": call substitute(Item, {pat}, {repl}, {flags}) for each
" {lod} Item.
"
" {lod} (list or dict)
" [...] values `a:1', `a:2', ... accessible in a {repl} expression
"

func! Msubstitute(_lod_, pat, repl, flags, ...)
return map(a:_lod_, 'substitute(v:val, a:pat, a:repl, a:flags)')
endfunc

" then you can use:
let list2c = Msubstitute(copy(list1), '.*', '<&>', 'g')

> Intent: to put <...> around every argument. Now, this isn't really
> my final intent for this, but if I could get that substitute to
> work, it'd be a nice start. Please note, the request is on how to
> get a substitute() to work with map(), not to put angle brackets
> around every list element, for which :help map() already has an
> example.
>
> 5. Bonus request: my construction above carefully gets a newline into
> the list. Using :echo string(list):
>
> ['one two', 'three four', 'five', 'six', '
> seven', 'eight', ' ']
>
> I cannot seem to get rid of the newline, but its probably due to my
> lack of success with substitute().
>
> I've spent about three hours on this so far, with multiple attempts,
> all unsuccessful. Perhaps an extra example in help map() illustrating
> how to do this would be of use?
>
> Thank you,
> Chip Campbell

--
Andy

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