;;; -*- lexical-binding: t -*-
;;
;; this file:
;;   https://dataswamp.org/~incal/emacs-init/align-incal.el

(require 'cl-lib)
(require 'string)

(defun insert-at-col (str col)
  (interactive "s string: \nncol: ")
  (let*((beg (or (current-column) 0))
        (pad-len (- col beg)) )
    (when (> pad-len 0)
      (insert (make-string pad-len ?\s) str) )))

(let ((push-col 0))
  (defun push-to-col (&optional set-col)
    (interactive "P")
    (if (integerp set-col)
        (setq push-col set-col)
      (if (and set-col (listp set-col))
          (progn
            (setq push-col (or (current-column) 0))
            (message "done: %s" push-col) )
        (let*((beg (or (current-column) 0))
              (pad-len (- push-col beg)) )
          (when (> pad-len 0)
            (insert (make-string pad-len ?\s))
            (forward-line)
            (unless (looking-at "$")
              (forward-char beg) ))))))
  (declare-function push-to-col nil) )

(defun eat-space ()
  (interactive)
  (let ((beg (point))
        (same-line-whitespace " \t") )
    (beginning-of-line)
    (if (looking-at (format "^[%s]*$" same-line-whitespace))
        (delete-blank-lines)
      (goto-char beg)
      (if (zerop (skip-chars-forward same-line-whitespace))
          (progn
            (delete-horizontal-space)
            (insert "\s") )
        (delete-region beg (point)) ))))

(provide 'align-incal)