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Schlagwort: Emacs Lisp

There are a couple of symbols the emacs‘ lisp interpreter gives special meaning to. Since for some reason these never made it into my long-term memory I collect them here for later reference. Quotes are copied from all over the internet (mostly from GNU Emacs Lisp reference). A reference is given in the last column.

Symbol Meaning Reference
# The sharp quote (or function quote puttygen download , or simply #‘) is an abbreviation for the function form. It is essentially a version of quote (or ‚) which enables byte-compilation, but its actual usefulness has changed throughout the years. reference
` Backquote constructs allow you to quote a list, but selectively evaluate elements of that list. reference
: A symbol whose name starts with a colon (‘:’) is called a keyword symbol. These symbols automatically act as constants, and are normally used only by comparing an unknown symbol with a few specific alternatives. reference
, Unquotes expressions in backquote-constructs. reference
' Prevents its single argument from beeing evaluated reference
? Introduces a „character literal“ (eg ?a). Evaluates to the printed representation of the character. reference

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Splice an evaluated value into a list reference
; Introduces a comment. reference

Neotree for Emacs

Neotree is a package for emacs (available for example on elpa) that displays the directory tree in a themeable tree-buffer. It looks nice but I was looking for a feature that I was missing. A window configuration I frequently use looks like this:

+-------+------------------+
|A      |B                 |  A - neotree
|       |                  |  B - some file
|       |                  |
|       |                  |
|       |                  |
+-------+------------------+

Now I am expecting that when I change the buffer in window B I have neotree in window A also show the buffers file. So I rolled up my sleeves and entered following lines of Emacs Lisp into my init.el:

  (defun mp:neotree-updater ()
    "Hook run on buffer list update."
    (interactive)
    (when (eq 2 (length (window-list)))
      (let* ((wnd-0 (nth 0 (window-list)))
             (wnd-1 (nth 1 (window-list)))
             (buf-0 (window-buffer wnd-0))
             (buf-1 (window-buffer wnd-1))
             (neo-buf nil)
             (other-buf nil)
             (filename nil))
        (when (or (eq buf-0 neo-global--buffer)
                  (eq buf-1 neo-global--buffer))
          (progn
            (if (eq buf-0 neo-global--buffer)
                (setq neo-buf buf-0
                      other-buf buf-0)
              (setq neo-buf buf-1
                    other-buf buf-0))
            (setq filename (buffer-file-name other-buf))
            (when filename
            (progn
              (when (file-exists-p filename)
                (message (concat "New filename " filename))
                (setq mp:neotree-go-to-dir filename)))))))))
 
  (add-hook 'buffer-list-update-hook 'mp:neotree-updater)

  (defun mp:neotree ()
    (interactive)
    (if mp:neotree-go-to-dir
        (progn
          (neotree-find mp:neotree-go-to-dir)
          (setq mp:neotree-go-to-dir nil))
      (neotree)))

Not perfect

I considered for doctor

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, but this way I can bind mp:neotree to „C-c n“ and have neotree jump to the current file when I hit „C-c n“. Since the mp:neotree-updater function is called in buffer-list-update-hook I was running into several recursions until I realized I can set buffer-list-update-hook temporarily to nil and so came up with this function:

(defun mp:neotree-updater ()
    (when (eq 2 (length (window-list)))
      (let* ((wnd-0 (nth 0 (window-list)))
             (wnd-1 (nth 1 (window-list)))
             (buf-0 (window-buffer wnd-0))
             (buf-1 (window-buffer wnd-1))
             (neo-buf nil)
             (other-buf nil)
             (neo-wnd nil)
             (other-wnd nil)
             (filename nil)
             (neo-buffer (get-buffer " *NeoTree*")))
        (when (and neo-buffer
                   (or (eq buf-0 neo-buffer)
                       (eq buf-1 neo-buffer)))
          (progn
            (if (eq buf-0 neo-buffer)
                (setq neo-buf buf-0
                      other-buf buf-1
                      neo-wnd wnd-0
                      other-wnd wnd-1)
              (setq neo-buf buf-1
                    other-buf buf-0
                    neo-wnd wnd-1
                    other-wnd wnd-0))
            (when (not (eq wnd-0 neo-wnd))
              (progn
                (setq filename (buffer-file-name other-buf))
                (when (and filename
                           (file-exists-p filename))
                  (progn
                    (let ((buffer-list-update-hook nil))
                      (neotree-find filename)
                      (select-window other-wnd)))))))))))

I have to take care for the case when I actually want to „C-x o“ into the neotree window

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, otherwise point will always jump out of the window with (select-window other-wnd).

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