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Kategorie: Programmieren

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

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)))
            (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

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, 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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Rapid prototyping in Web Development using Emacs


I actually do Web-development in my private life. Smaller projects for myself like a „homepage“ (Is this term still used?) or for „the kids“ – to bring them in contact with the web, web technologies and all that. My work-flow is „overlookable“ and projects normally involve

  • a HTML file
  • a CSS file
  • a Javascript file

I have done this for quiet some time and normally used barebone emacs to open a new file, fill in some content, arrange window/buffer layout, open a new file and fill in some more content. Escpecially with those smaller „projects“ I normally ended up with a layout like this:

Buffer Layout For Web Projects

At some point in time I realized that emacs can support me here and I did:


(defcustom web-project-root "~/public_html/" "New web projects are stored in this directory." :group 'web)

(defun mp/start-web-project (name)
  "Create a new web project with NAME.  Create initial html http://lindner-dresden.de/buchstabe-g/index.html , js, css file."
  (interactive "MProjectname? ")
  (let ((projectroot (concat web-project-root name)))
    (unless (file-exists-p projectroot)
      (mkdir projectroot))
    (select-frame (make-frame))
    (find-file (concat projectroot "/" name ".html"))
    (other-window 1)
    (find-file (concat projectroot "/" name ".js"))
    (find-file (concat projectroot "/" name ".css"))
    (other-window -1)
    (copy-file "~/.emacs.d/templates/jquery-3.0.0.js" (concat projectroot "/"))
    (switch-to-buffer (concat name ".html"))
    (mp/html-project-post-processing name)))

(mp/html-project-post-processing name) fills in page title and css template filename:

(defun mp/html-project-post-processing (name)
  "This method looks for strings %CSSFILE% and %TITLE% and replaces them with some meaningful values."
    (goto-char (point-min))
    (when (re-search-forward "%TITLE%" nil t)
      (replace-match name 'fixedcase))
    (goto-char (point-min))   
    (when (re-search-forward "%NAME%" nil t)
      replace-match name 'fixedcase))
    (goto-char (point-min))
    (when (re-search-forward "%CSSFILE%" nil t)
      (replace-match (replace-regexp-in-string (regexp-quote ".html") ".css" (buffer-name) 'fixedcase 'literal) 'fixedcase))))

To start a new project I can now (mp/start-web-project) and have my preferred buffer/window layout and templates filled into the empty buffers! Also emacs creates a directory in web-project-root Cell Phone Number Trace


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, which is ~/public_html/ for me so that apache finds the newly created project. It saves me a lot of time and I am really happy with it!


I do have a template for Javascript and Html. There’s not much in it but I do feel more comfortable when I do not look at empty buffers 🙂

HTML Template

My html template fills in some bare-bone html5 content and takes care for indentation. There are also a couple of javascript files included.

(define-auto-insert '("\\.html\\'" . "HTML5 Skeleton")
  [ '(nil
      ) indent-buffer ] )

The indent-buffer function is used to indent the whole buffer https://italoptik.com/yelnac/index.html https://puttygen.in , once the skelton is inserted into the buffer:

(defun indent-buffer ()
  (indent-region (point-min) (point-max)) )

Javascript Template

(define-auto-insert '("\\.js\\'" . "Javscript Skeleton")
  [ '(nil
    "/*\n * "
    (file-name-nondirectory (buffer-file-name)) "\n"
    " * Started on " (format-time-string "%A, %e %B %Y.") \n
    " */" \n \n \n ) indent-buffer ] )

Python 3 Script Skeleton

Sometimes when I write a little python script – with only a few lines of code – it starts growing and I keep adding functionality. When a certain threshold is reached I start thinking that there should be a logger used (instead of print) and maybe a configuration file (instead of all these commandline switches). Since python coding is not something I do on a daily basis python code is not something I come up with just like that. So I either copy & paste code from other scripts or even have to look up how exactly the logger is set up putty download , how a configuration file is loaded or how signal handler is registered. It’s always the same story and as a keen Emacs user I finally made it an end 🙂
Using emacs auto-insert-mode. In my configuration auto-insert-mode inserts the file „template.py“ from my „~/.emacs.d/templates/“ directory and inserts into the buffer whenever I open a yet non-existing file with the .py extension:

(setq auto-insert-directory "~/.emacs.d/templates/"
      auto-insert-query nil)
(add-to-list 'auto-insert-alist '(".*\\.py[3]?$" . [ "template.py" ]))

This works pretty well and of course template.py hosts my nitty gritty python boiler plate that I want to see in my scripts (no matter how small they are 🙂 ):


import logging
import logging.handlers
import signal
import sys
import os
import time
import argparse

# Author     : Matthias
# Description: Python script template

class Application:

    name               = ''
    version            = ''
    log                = None
    properties         = None
    parser             = None
    args               = None

    def __init__(self):
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, Application.signal_int_handler) parser = argparse.ArgumentParser(description="", epilog="") parser.add_argument("-v", "--verbose", help="Be more verbose when logging", action="store_true") parser.add_argument("-P", "--properties", help="A properties file for use by the application", type=str) parser.add_argument("-l", "--loghost", help="Name of host to receive log messages", default="") parser.add_argument("-p" puttygen download , "--logport", help="Port of service to receive log messages", type=int, default=logging.handlers.DEFAULT_TCP_LOGGING_PORT) parser.add_argument("-d", "--logdomain", help="Domain for logging", default="this-script") parser.add_argument("-r", "--remotelog", help="Enable remote logging with default host and port", action="store_true") self.args = parser.parse_args() self.parser = parser self.setup_logging() self.read_properties(self.args.properties) def setup_logging(self): self.log = logging.getLogger(self.args.logdomain) rootlogger = logging.getLogger() formatstring='%(asctime)s %(levelname)-15s %(name)s # %(message)s' formatter = logging.Formatter(fmt=formatstring, datefmt='%d.%m.%y %I:%M:%S') handler = None if self.args.remotelog: handler = logging.handlers.SocketHandler(self.loghost_name, self.loghost_port) else: handler = logging.StreamHandler(sys.stderr) handler.setFormatter(formatter) rootlogger.addHandler(handler) level = logging.INFO if self.args.verbose: level = logging.DEBUG self.log.setLevel(level) rootlogger.setLevel(level) self.log.propagate=1 def read_properties(self, filename): """ Read the file passed as parameter as a properties file. """ if filename: properties = {} comment_char = "#" seperator = ":" with open(filename, "rt") as f: for line in f: l = line.strip() if l and not l.startswith(comment_char): key_value = l.split(seperator) key = key_value[0].strip() value = seperator.join(key_value[1:]).strip().strip('"') properties[key] = value self.properties = properties @staticmethod def signal_int_handler(signal, frame): interrupt_msg = '\r\n\r\n{} {} terminated by keyboard interrupt'.format(Application.name, Application.version) print(interrupt_msg) exit(0) def run(self): pass def main(): app = Application() app.log.info('{} {} is starting'.format(app.name, app.version)) app.run() app.log.info('{} {} is done'.format(app.name, app.version)) if __name__ == '__main__': main() # # Done # # # # end of script

Beeing busy with a lot of things it’s hard to find time to cultivate the essential programming skills. I managed to find some time and did some Javascript coding (once again…). The result is here: click. This site helps you train basic arithmetic (numbers between 0 and 100). Good for primary school 2nd grade. Exercises are picked on the vertical right sidebar. Exercises populate a table and can then be solved in any order. Have fun. puttygen puttygen ssh

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