home/rc/tools/comment.kak

# Line comments
declare-option -docstring "characters inserted at the beginning of a commented line" \
    str comment_line '#'

# Block comments
declare-option -docstring "characters inserted before a commented block" \
    str comment_block_begin
declare-option -docstring "characters inserted after a commented block" \
    str comment_block_end

# Default comments for all languages
hook global BufSetOption filetype=asciidoc %{
    set-option buffer comment_block_begin '///'
    set-option buffer comment_block_end '///'
}

hook global BufSetOption filetype=(c|cpp|dart|go|java|javascript|objc|php|rust|sass|scala|scss|swift|typescript) %{
    set-option buffer comment_line '//'
    set-option buffer comment_block_begin '/*'
    set-option buffer comment_block_end '*/'
}

hook global BufSetOption filetype=(cabal|haskell|moon|idris|elm|dhall) %{
    set-option buffer comment_line '--'
    set-option buffer comment_block_begin '{-'
    set-option buffer comment_block_end '-}'
}

hook global BufSetOption filetype=clojure %{
    set-option buffer comment_line '#_'
    set-option buffer comment_block_begin '(comment '
    set-option buffer comment_block_end ')'
}

hook global BufSetOption filetype=coffee %{
    set-option buffer comment_block_begin '###'
    set-option buffer comment_block_end '###'
}

hook global BufSetOption filetype=css %{
    set-option buffer comment_line ''
    set-option buffer comment_block_begin '/*'
    set-option buffer comment_block_end '*/'
}

hook global BufSetOption filetype=d %{
    set-option buffer comment_line '//'
    set-option buffer comment_block_begin '/+'
    set-option buffer comment_block_end '+/'
}

hook global BufSetOption filetype=(gas|ini) %{
    set-option buffer comment_line ';'
}

hook global BufSetOption filetype=haml %{
    set-option buffer comment_line '-#'
}

hook global BufSetOption filetype=(html|xml) %{
    set-option buffer comment_line ''
    set-option buffer comment_block_begin '<!--'
    set-option buffer comment_block_end '-->'
}

hook global BufSetOption filetype=latex %{
    set-option buffer comment_line '%'
}

hook global BufSetOption filetype=ledger %{
    set-option buffer comment_line ';'
}

hook global BufSetOption filetype=lisp %{
    set-option buffer comment_line ';'
    set-option buffer comment_block_begin '#|'
    set-option buffer comment_block_end '|#'
}

hook global BufSetOption filetype=lua %{
    set-option buffer comment_line '--'
    set-option buffer comment_block_begin '--[['
    set-option buffer comment_block_end ']]'
}

hook global BufSetOption filetype=markdown %{
    set-option buffer comment_line ''
    set-option buffer comment_block_begin '[//]'
    set-option buffer comment_block_end '# (:)'
}

hook global BufSetOption filetype=perl %{
    set-option buffer comment_block_begin '#['
    set-option buffer comment_block_end ']'
}

hook global BufSetOption filetype=pug %{
    set-option buffer comment_line '//'
}

hook global BufSetOption filetype=python %{
    set-option buffer comment_block_begin "'''"
    set-option buffer comment_block_end "'''"
}

hook global BufSetOption filetype=ragel %{
    set-option buffer comment_line '%%'
    set-option buffer comment_block_begin '%%{'
    set-option buffer comment_block_end '}%%'
}

hook global BufSetOption filetype=ruby %{
    set-option buffer comment_block_begin '^begin='
    set-option buffer comment_block_end '^=end'
}

define-command comment-block -docstring '(un)comment selections using block comments' %{
    evaluate-commands %sh{
        if [ -z "${kak_opt_comment_block_begin}" ] || [ -z "${kak_opt_comment_block_end}" ]; then
            echo "fail \"The 'comment_block' options are empty, could not comment the selection\""
        fi
    }
    evaluate-commands -save-regs '"/' -draft %{
        # Keep non-empty selections
        execute-keys <a-K>\A\s*\z<ret>

        try %{
            # Assert that the selection has been commented
            set-register / "\A\Q%opt{comment_block_begin}\E.*\Q%opt{comment_block_end}\E\n*\z"
            execute-keys "s<ret>"
            # Uncomment it
            set-register / "\A\Q%opt{comment_block_begin}\E|\Q%opt{comment_block_end}\E\n*\z"
            execute-keys s<ret>d
        } catch %{
            # Comment the selection
            set-register '"' "%opt{comment_block_begin}"
            execute-keys P
            set-register '"' "%opt{comment_block_end}"
            execute-keys p
        }
    }
}

define-command comment-line -docstring '(un)comment selected lines using line comments' %{
    evaluate-commands %sh{
        if [ -z "${kak_opt_comment_line}" ]; then
            echo "fail \"The 'comment_line' option is empty, could not comment the line\""
        fi
    }
    evaluate-commands -save-regs '"/' -draft %{
        # Select the content of the lines, without indentation
        execute-keys <a-s>gi<a-l>

        try %{
            # Keep non-empty lines
            execute-keys <a-K>\A\s*\z<ret>
        }

        try %{
            set-register / "\A\Q%opt{comment_line}\E\h?"

            try %{
                # See if there are any uncommented lines in the selection
                execute-keys -draft <a-K><ret>

                # There are uncommented lines, so comment everything
                set-register '"' "%opt{comment_line} "
                align-selections-left
                execute-keys P
            } catch %{
                # All lines were commented, so uncomment everything
                execute-keys s<ret>d
            }
        }
    }
}

define-command align-selections-left -docstring 'extend selections to the left to align with the leftmost selected column' %{
    evaluate-commands %sh{
        leftmost_column=$(echo "$kak_selections_desc" | tr ' ' '\n' | cut -d',' -f1 | cut -d'.' -f2 | sort -n | head -n1)
        aligned_selections=$(echo "$kak_selections_desc" | sed -E "s/\.[0-9]+,/.$leftmost_column,/g")
        echo "select $aligned_selections"
    }
}