Re: BASH script: Indent with tabs, align with spaces

Hi Steven,

answering the last question seems to be a good way to put all together
in a simpler way so let's back on your clever pseudocode, I'll add
comments on this.

Short anwser is:

* ArgIndent does exactly what your pseudocode expects
* you need *both* 'ci and 'ai to be turned on
* CTRL_D and CTRL_T is the way to increment/decrement manually
  in insert mode. >> and << in normal mode.

Long anwser: inoremap \<cr> to ArgIndent does exactly what your
pseudocode want but in a different way

> if (Enter is pressed after a single backslash)

	=> inoremap \<cr>

> preserve the indentation and alignment of the previous line
	=> 'ai and 'ci must be set

> * go to new line
> * add spaces to align to the second word in the previous line
> # word: anything that is not white space

let's rewrite ArgIndent in vim9script and add comments

command -nargs=0 ArgIndent {
	y | put # yyp in normal mode # stage 1
	s!\v^\s+\zs(\S+\s+).*!\=repeat(' ', 1 + len(submatch(1)))!
}

at the end of the stage 1, we have

		    this --example \
		    this --example \

and we want to remove 'this' which is a substitution from
this

	\v^\s+\zs(\S+\s+).*

to this

	\=repeat(' ', 1 + len(submatch(1)))

in details:

	\v        # use "perlish/extended" regexp syntax
	^         # the begin of the line
	\s+       # at least one space|tab|nbsp
	\zs       # start matching there
	          # so previous chars will remain untouched
	(\S+\s+)  # capture a word "\S+" and the spaces after "\s+"
	.         # then the rest of the line

so in
		    this --example \

* 'this' is the word (submatch(1))
* '--example \' is the rest of the line

so the matched section is 'this --example \' and we replace it by
as many spaces as chars in in the word + 1

	1 + len(submatch(1))
	=> 1 + len("this")
	=> 1 + 4
	=> 5

	repeat(' ', 5 )
	=> '     '

so

		    this --example \

becomes

		         --example \

don't hesitate to ask if I wasn't clear.

regards


-- 
Marc Chantreux
Pôle CESAR (Calcul et services avancés à la recherche)
Université de Strasbourg
14 rue René Descartes,
BP 80010, 67084 STRASBOURG CEDEX
03.68.85.60.79

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