xeals/origami.el
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Add more interactive movement commands

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This commit is contained in:
Greg Sexton 2016-07-09 17:50:23 +01:00
parent 714fba2a9c
commit 1a957be171
2 changed files with 71 additions and 7 deletions
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17
README.md
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@ -123,7 +123,22 @@ buffer - those in bold are particularly useful:
<tr>
<td>origami-next-fold</td>
<td>Move to the next fold.</td>
<td>Move to the end of the next fold.</td>
</tr>
<tr>
<td>origami-forward-fold</td>
<td>Move to the start of the next fold.</td>
</tr>
<tr>
<td>origami-forward-fold-same-level</td>
<td>Move to the start of the next fold that is a sibling of the current fold.</td>
</tr>
<tr>
<td>origami-backward-fold-same-level</td>
<td>Move to the start of the previous fold that is a sibling of the current fold.</td>
</tr>
<tr>

49
origami.el
View File

@ -386,6 +386,20 @@ with the current state and the current node at each iteration."
(origami-fold-add-child leaf node))))
tree1 (origami-fold-children tree2)))
(defun origami-fold-parent (path)
(-last-item (-butlast path)))
(defun origami-fold-prev-sibling (siblings node)
(->> siblings
(-partition-in-steps 2 1)
(-drop-while (lambda (pair) (not (equal (cadr pair) node))))
caar))
(defun origami-fold-next-sibling (siblings node)
(->> siblings
(-drop-while (lambda (n) (not (equal n node))))
cadr))
;;; linear history structure
(defun origami-h-new (present)
@ -691,6 +705,41 @@ a fold, move to the end of the fold that POINT is in."
(->> (-last (lambda (pos) (> pos point))))
goto-char)))
(defun origami-forward-fold (buffer point)
"Move point to the beginning of the first fold in the BUFFER
after POINT."
(interactive (list (current-buffer) (point)))
(-when-let (tree (origami-get-fold-tree buffer))
(-> tree
(origami-fold-preorder-reduce (lambda (state n)
(cons (origami-fold-beg n) state)) nil)
(->> (-last (lambda (pos) (> pos point))))
goto-char)))
(defun origami-forward-fold-same-level (buffer point)
"Move point to the beginning of the next fold in the buffer
that is a sibling of the fold the point is currently in."
(interactive (list (current-buffer) (point)))
(-when-let (tree (origami-get-fold-tree buffer))
(-when-let (path (origami-fold-find-path-containing tree point))
(when-let (c (-> (origami-fold-next-sibling (origami-fold-children
(origami-fold-parent path))
(-last-item path))
origami-fold-beg))
(goto-char c)))))
(defun origami-backward-fold-same-level (buffer point)
"Move point to the beginning of the previous fold in the buffer
that is a sibling of the fold the point is currently in."
(interactive (list (current-buffer) (point)))
(-when-let (tree (origami-get-fold-tree buffer))
(-when-let (path (origami-fold-find-path-containing tree point))
(-when-let (c (-> (origami-fold-prev-sibling (origami-fold-children
(origami-fold-parent path))
(-last-item path))
origami-fold-beg))
(goto-char c)))))
(defun origami-undo (buffer)
"Undo the last folding operation applied to BUFFER. Undo
history is linear. If you undo some fold operations and then