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pull out imenu index flattening code

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Ivan Malison
2016-06-10 13:44:10 -07:00
parent 369cec1b3d
commit 514b7eb27d
1 changed files with 23 additions and 20 deletions
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43
dotfiles/emacs.d/README.org
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@@ -262,6 +262,29 @@ These definitions silence the byte-compiler
(defalias 'yes-or-no-p 'y-or-n-p)
#+END_SRC
* Lisp
** Flatten imenu indexes
I like my imenu indexes flat so I don't have to press enter multiple times to find what I'm looking for. The functions that follow allow me to get this behavior out of functions that provide a nested imenu index.
#+BEGIN_SRC emacs-lisp
(defun imalison:imenu-prefix-flattened (index)
(let ((flattened (imalison:flatten-imenu-index (cdr index))))
(cl-loop for sub-item in flattened
collect
`(,(concat (car index) "." (car sub-item)) . ,(cdr sub-item)))))
(defun imalison:flatten-imenu-index (index)
(let ((cdr-is-index (listp (cdr index))))
(cond ((not (stringp (car index))) (cl-mapcan
#'imalison:flatten-imenu-index index))
(cdr-is-index (imalison:imenu-prefix-flattened index))
(t (list index)))))
(defun imalison:make-imenu-index-flat ()
(let ((original-imenu-function imenu-create-index-function))
(setq imenu-create-index-function
(lambda ()
(imalison:flatten-imenu-index
(funcall original-imenu-function))))))
#+END_SRC
** An emacs version predicate builder:
#+BEGIN_SRC emacs-lisp
(defmacro imalison:emacs-version-predicate (major-version minor-version)
@@ -382,26 +405,6 @@ Prefix alternatives is a macro that builds a function that selects one of a coll
`(setq ,name ,value)
`(defvar ,name ,value)))
(defun imalison:imenu-prefix-flattened (index)
(let ((flattened (imalison:flatten-imenu-index (cdr index))))
(cl-loop for sub-item in flattened
collect
`(,(concat (car index) "." (car sub-item)) . ,(cdr sub-item)))))
(defun imalison:flatten-imenu-index (index)
(let ((cdr-is-index (listp (cdr index))))
(cond ((not (stringp (car index))) (cl-mapcan
#'imalison:flatten-imenu-index index))
(cdr-is-index (imalison:imenu-prefix-flattened index))
(t (list index)))))
(defun imalison:make-imenu-index-flat ()
(let ((original-imenu-function imenu-create-index-function))
(setq imenu-create-index-function
(lambda ()
(imalison:flatten-imenu-index
(funcall original-imenu-function))))))
(defmacro defvar-if-non-existent (name value)
(unless (boundp name)
`(defvar ,name ,value)))