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Schlagwort: Emacs

projectile is not regenerating TAGS file for etags

I am using projectile since a couple of days and really love how I can change to another file in the current project (using C-c p f). However I am facing a little issue when I am generating a tags file for etags. I get

projectile-regenerate-tags: ctags: invalid option — ’e’
Try ’ctags –help’ for a complete list of options.

Whenever I „C-c p R“ even though I have picked etags as my tags program. However after reading this I have constructed a tags command for me like this:

(setq projectile-tags-command "etags -a TAGS \"%s\"")

Ans it looks like now it works nicely…

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Copying files between dired buffers

There is a couple of packages for emacs that really have application character. Like for example:

  • https://www.emacswiki.org/emacs/Magit
  • https://www.emacswiki.org/emacs/EmacSpeak
  • https://www.emacswiki.org/emacs/GnusTutorial
  • https://github.com/skeeto/elfeed
  • https://emacswiki.org/emacs/Sunrise_Commander

And there are propably some more. Me personally – I did not adopt well to the „App in Emacs“ approach as I use none of the mentioned packages. It’s not a categorical decision

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, I just did not get used to it. My writings in Emacs Lisp have a much lesser extend: Recently I had need to copy files from one directory to the other and I just love to have this done with two directories showing up side by side as in well known „file commanders“. That said Emacs Lisp comes to the rescue!

(defun mp-dired-2pane-copy-over ()
    (when (eq 2 (length (window-list)))
      (let ((other-directory nil)
            (file-to-copy (dired-get-filename)))
          (other-window 1)
          (setq other-directory (dired-current-directory))
          (other-window 1)
          (copy-file file-to-copy other-directory)
          (other-window 1)
          (other-window 1)))))

Show long filenames in ibuffer

I have customized my ibuffer-format to have the name column width set to 36. This is fine in 99% of the filenames showing up there. However I also have to access a couple of files that have a common prefix that is longer then 36 characters. This way the files cannot be distinguished in ibuffer… Since I am not willing to have the width set to even higher value I have added this little defun to my init.el to deal with the issue:

(defun mp/ibuffer-show-filename ()
  (let ((buf (ibuffer-current-buffer))
        (lsoutput nil))
    (when (file-exists-p (buffer-file-name buf))
        (let* ((filename (buffer-file-name buf))
               (default-directory (file-name-directory filename))
               (just-filename (file-name-nondirectory filename)))
          (call-process "/usr/bin/ls" nil t nil "-l" just-filename)
          (setq lsoutput (buffer-substring-no-properties (point-min) (- (point-max) 1))))))
    (message lsoutput)))

(define-key ibuffer-mode-map (kbd "f") 'mp/ibuffer-show-filename)

This way I can stick to my column width of 36 and whenever I have need to see the a longer filename I can just press f on the entry and see the name at the bottom of the screen.

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Building a tree-view for xml data

Even though I am a long time Emacs user I only recently realized that I am really missing treeviews. There are numerous applications like getting an overview of a directory hierarchy  or structure of documents in xml format. It’s a nice thing to have and of course Emacs does not stand back and has something to offer:

To name a couple that immediatly show up. For the dyi people emacs brings an xml parser and a thing called „Tree-widget“ that allows for building of tree-views.  I gave these a try. And since the web does not seem to overflow with information about using tree widget I dump it here – hoping that other beginners might profit from it:


(setq xml "123A message.Information!")
(setq xml-2 "123Here is the messageInformation!")
(setq xml-3 "123")

(setq root (with-temp-buffer
             (insert xml)
             (xml-parse-region (point-min) (point-max))))

(setq root-2 (with-temp-buffer
               (insert xml-2)
               (xml-parse-region (point-min) (point-max))))

(setq root-3 (with-temp-buffer
               (insert xml-3)
               (xml-parse-region (point-min) (point-max))))

(setq root-4 (with-current-buffer "some-more-complex.xml"
               (xml-parse-region (point-min) (point-max))))

(xml-node-children (car root-3))

(cdr (car (car (nthcdr 1 (car root)))))

(let* (
       (post (car root))
       (attrs (xml-node-attributes post)))

(require 'tree-widget)

(defun xml-to-tree-widget (xml)
   ((stringp xml)
    (widget-convert 'item :tag xml))
   ((listp xml)
    (let ((attributes (xml-node-attributes xml))
          (attrib-widgets nil)
          (children (xml-node-children xml))
        (when attributes
          (setq attrib-widgets (mapcar (lambda (prop)
                                         (widget-convert 'item
                                                         :tag (format "%s=%s" (symbol-to-string (car prop)) (cdr prop))))
        (setq current-node (widget-convert 'tree-widget 
                                           :tag (symbol-to-string (car xml))
                                           :args (append (if children 
                                                             (mapcar (lambda (node)
                                                                       (xml-to-tree-widget node))
        current-node ) ) ) ) )

(xml-to-tree-widget (car root))

(xml-to-tree-widget (car root-3))

(xml-to-tree-widget "text")

(defun test-tree-widget ()
  (with-current-buffer (get-buffer-create "*tree-widget-test*")
    (setq-local my-tree-widget (widget-create (xml-to-tree-widget (car root-4))))
    (switch-to-buffer (current-buffer))))

;; This one will show the tree-widget in an empty buffer.

It’s not yet a piece of code that can be (use-package)ed or even (require)d 🙂 I entered the code in emacs and then „C-x C-e“ where necessary. When the initial xml data contains spaces (e.g. between a closing and the next opening tag) the resulting „tree“ contains empty lines

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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."
    (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))
            (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
              (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 ()
    (if mp:neotree-go-to-dir
          (neotree-find mp:neotree-go-to-dir)
          (setq mp:neotree-go-to-dir nil))

Not perfect

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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)))
            (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))
                (setq filename (buffer-file-name other-buf))
                (when (and filename
                           (file-exists-p filename))
                    (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, otherwise point will always jump out of the window with (select-window other-wnd).

Writing Java code with Emacs

Writing Java sourcecode in Emacs is a rather hard task. Emacs does not usually support the developer with lots of context awareness (friendly put…). What does the unsatisfied developer do when he is in need for functionality? He codes his own solution! So I have just started work on „Emacs Java Coding Extension (version 0.0.1)“. The project is admittedly in a very early phase. But there is an ambitious roadmap and some lines of code already available. Fresh from the scratch buffer where I tried it out:

(defvar mp:ac-classpath-cache nil)

(defun mp:ac-classpath-init ()
  (setq mp:ac-classpath-cache (mp:read-classes-from-jar)))

(defvar ac-source-classpath
  '((prefix . "^import \\(.*\\)")
    (init . mp:ac-classpath-init)
    (candidates . mp:ac-classpath-cache)))

(defun mp:read-classes-from-jar ()
    (call-process "/usr/bin/unzip" nil t nil "-l" "/home/map/opt/jdk1.8.0_101/jre/lib/rt.jar")
    (goto-char (point-min))
    (let ((end 0)
          (result '())
          (classname ""))
      (while (search-forward ".class" nil t nil)
        (setq end (point))
        (goto-char (+ (point) 30))
        (setq classname (substring 
                         (replace-regexp-in-string "/" "."
                                                   (buffer-substring-no-properties (point) end))
                         0 -6))
        (setq result (cons classname result))
        (forward-line 1)

Put together correctly the code supplies a auto-complete source that knows about classes from the java rt.jar file – or any other jar file – or with some modifications several jar files.

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Running shell inside Emacs

As a emacs user i don’t really use a shell inside emacs that often. If i do my need for shell is satisfied with one shell that i re-use whenever necessary. To understand how emacs offers terminal emulation and shell support there is already a nice article over at masteringemacs.org ( http://www.masteringemacs.org/article/running-shells-in-emacs-overview ). I found that for my personal usage this works well:

  1. If i am in a frame with one window only, i split the window into two – one for ansi-term one for other buffer
  2. If i current window is showing an ansi-term buffer and i press my „shell-trigger-key“ i want to close it
  3. If current frame hosts more than one window i open ansi-term in a new frame

I burn this into emacs lisp and bind it to a single key to make it dwim.

;; [ ansi-term

(defconst ansi-term-window-height -15 "Height of ansi term window")
(defconst ansi-term-buffer-name "*ansi-term*")
(defconst ansi-term-shell-command "/bin/bash")

(defun start-bash-or-select-existing ()
  "If a buffer named *ansi-term* exist make it current.
Otherwise just call (ansi-term \"/bin/bash\")"
  (let ((termbuffer (get-buffer ansi-term-buffer-name)))
    (if (bufferp termbuffer)
	(set-window-buffer nil termbuffer)
      (ansi-term ansi-term-shell-command))))

(defun start-bash-in-ansi-term ()
  "Context sensitive run bash from emacs ansi-term.
If the current windows buffer is called *ansi-term* delete the window.
If it's the only window in the frame, also close the frame.
If the current windows buffer is not called *ansi-term* and the current 
window shows exactly one window then split the window and either show
existing *ansi-term* buffer or execute a new shell in ansi-term. If the
current frame shows more then one window open a new frame and open an
existing *ansi-term* there (or execute a new shell in ansi-term)."
  (let ((numWindows (length (window-list))))
    (if (string= (buffer-name) ansi-term-buffer-name)
	(if (eq 1 numWindows)
      (if (eq 1 numWindows)
	  (let ((newwindow (split-window nil ansi-term-window-height)))
	    (select-window newwindow)
	  (select-frame (make-frame))

(global-set-key (kbd "") 'start-bash-in-ansi-term)
;; ]

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