kakoune/rc/base/autowrap.kak

# Maximum amount of characters per line
decl int autowrap_column 80

# If enabled, paragraph formatting will reformat the whole paragraph in which characters are being inserted
# This can potentially break formatting of documents containing markup (e.g. markdown)
decl bool autowrap_format_paragraph yes
# Command to which the paragraphs to wrap will be passed, all occurences of '%c' are replaced with `autowrap_column`
decl str autowrap_fmtcmd 'fold -s -w %c'

def -hidden autowrap-cursor %{ eval -draft %{
    try %{
        ## if the line isn't too long, do nothing
        exec -draft "<a-x><a-k>^[^\n]{%opt{autowrap_column},}<ret>"

        try %{
            ## if we're adding characters past the limit, just wrap them around
            exec "<a-h><a-k>.{%opt{autowrap_column},}<ret>1s(\h+)[^\h]+\'<ret>c<ret><esc>"
        } catch %{
            ## if we're adding characters in the middle of a sentence, use
            ## the `fmtcmd` command to wrap the entire paragraph
            %sh{
                if [[ "${kak_opt_autowrap_format_paragraph}" = true ]] \
                    && [[ -n "${kak_opt_autowrap_fmtcmd}" ]]; then
                    format_cmd=$(printf %s "${kak_opt_autowrap_fmtcmd}" \
                                 | sed -e "s/%c/${kak_opt_autowrap_column}/g" \
                                       -e 's/ /<space>/g')
                    printf %s "exec -draft <a-i>p|${format_cmd}<ret>"
                fi
            }
        }
    }
} }

def autowrap-enable -docstring "Wrap the lines in which characters are inserted" %{
    hook -group autowrap window InsertChar [^\n] autowrap-cursor
}

def autowrap-disable -docstring "Disable automatic line wrapping" %{
    rmhooks window autowrap
}