lineindent.kak

##
## lineindent.kak by lenormf
## Align a line with the previous/next, across empty ones
##

def -params 1 \
-docstring %{lineindent <offset>: indent the current selection using a remote line as reference
The offset argument is an integer that indicates the number of the reference line, but can be prefixed with the following:
  - '-': indent with the previous non empty line, e.g. -2 for second line above the current selection
  - '+': indent with the next non empty line, e.g. +3 for the third line beneath the current selection} \
    lineindent %{ %sh{
    pattern_align=''
    n=$(expr "$1" : '[+-]*\([0-9]*\)')
    case "$1" in
        -[0-9]*) pattern_align="${n}<a-/>^\\h*[^\\h\\n]+<ret>";;
        +[0-9]*) pattern_align="gl ${n}/^\\h*[^\\h\\n]+<ret>";;
        [0-9]*) pattern_align="${n}g";;
        *) exit;;
    esac

    printf %s\\n "eval -draft %{
        try %{ exec \"<a-s><a-K>^$<ret>giZ'<space>${pattern_align}gi<a-z>a<a-&>\" }
    }"
} }