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-rw-r--r--lisp/init-outline.el55
1 files changed, 53 insertions, 2 deletions
diff --git a/lisp/init-outline.el b/lisp/init-outline.el
index 433ab0f..440db21 100644
--- a/lisp/init-outline.el
+++ b/lisp/init-outline.el
@@ -1,4 +1,54 @@
+(defun km/outline--parent-levels (n)
+ "Return list of parent levels.
+4 -> (1 2 3)
+1 -> nil"
+ (unless (> n 0)
+ (user-error "N must be positive"))
+ (let (parents)
+ (while (/= n 1)
+ (setq n (1- n))
+ (push n parents))
+ parents))
+
+(defun km/outline-imenu-create-index ()
+ "Generate Imenu index for headings.
+This assumes that `outline-regexp' marks the characters that
+indicate a heading, but not the text following it. The heading
+text is taken as everything on the line after the
+`outline-regexp' match (except for any leading whitespace)."
+ (goto-char (point-min))
+ (let (path-alist ; ((level . heading))
+ index)
+ (while (re-search-forward (concat "^" outline-regexp) nil t)
+ (let* ((head (replace-regexp-in-string
+ "\\`\\s-*" ""
+ (buffer-substring-no-properties (point) (point-at-eol))))
+ (head-level (save-excursion (beginning-of-line)
+ (funcall outline-level)))
+ (parent-levels (km/outline--parent-levels head-level))
+ (parent-heads
+ (delq nil (mapcar (lambda (n) (cdr (assoc n path-alist)))
+ parent-levels)))
+ (target (concat (mapconcat #'identity
+ (append parent-heads
+ (list head))
+ " / "))))
+ (unless (string= head "")
+ (push (cons target (save-excursion (beginning-of-line) (point-marker)))
+ index))
+ (push (cons head-level head) path-alist)))
+ (nreverse index)))
+
+(defun km/outline-jump-to-heading ()
+ "Jump to heading specified by `outline-regexp'."
+ (interactive)
+ (let ((imenu-create-index-function #'km/outline-imenu-create-index)
+ helm-cached-imenu-tick
+ helm-cached-imenu-alist
+ helm-cached-imenu-candidates)
+ (call-interactively #'helm-imenu)))
+
;; Modified from https://github.com/abo-abo/hydra/wiki/Emacs
(defhydra hydra-outline-mode (:hint nil)
"
@@ -7,7 +57,7 @@ _q_ sublevels _a_ all _u_ up
_t_ body _e_ entry _n_ next visible
_o_ other _i_ children _p_ previous visible
_c_ entry _k_ branches _f_ forward same level
-_l_ leaves _s_ subtree _b_ backward same level
+_h_ leaves _s_ subtree _b_ backward same level
_d_ subtree
"
@@ -15,7 +65,7 @@ _d_ subtree
("t" hide-body)
("o" hide-other)
("c" hide-entry)
- ("l" hide-leaves)
+ ("h" hide-leaves)
("d" hide-subtree)
("a" show-all)
@@ -30,6 +80,7 @@ _d_ subtree
("f" outline-forward-same-level)
("b" outline-backward-same-level)
+ ("l" km/outline-jump-to-heading "jump" :color blue)
("m" outline-mark-subtree "mark" :color blue))
(defun km/hydra-outline-mode ()