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Kategorie: Emacs (Seite 2 von 2)

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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Unittesting with QUnit

I have another toy project that i use to develop in my free time (No, I do not have too much free time. I just have started a couple of minor projects in the past and have not yet written about it). It’s a javascript based graph drawing tool. It turned out that i had introduced a couple of bugs and only then wanted to have Unittests. So I looked around for unittesting frameworks for Javascript and found QUnit.


QUnit is a powerful

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, easy-to-use JavaScript unit testing framework.“ says the official homepage (link). It actually is easy to get used to and offers what one can expect from a unit testing framework (which I consider to be a nice test runner and a couple of asserts). The framework is quickly set up and first tests are written soon. The question I asked myself was „If I do this again tomorrow

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, the day after tomorrow and every day for the next 2 years – how can I simplify my usage of this powerful framework.

And this is where Emacs jumps in!


So currently the situation is like this: I am editing some javascript file and realize „Time for Unittests“. This is what i came up with:

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

(defun mp/html-post-processing ()
  "This method looks for a couple of key-strings and replaces them with some meaningful values."
    (goto-char (point-min))
    (when (re-search-forward "%TITLE%" nil t)
      (replace-match (replace-regexp-in-string (regexp-quote ".html") "" (buffer-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) 'fixedcase))
    (when (re-search-forward "%TESTEE%" nil t)
      (replace-match (replace-regexp-in-string (regexp-quote "-test.html") ".js" (buffer-name) 'fixedcase) 'fixedcase))
    (when (re-search-forward "%UNITTESTS%" nil t)
      (replace-match (replace-regexp-in-string (regexp-quote "-test.html") "-test.js" (buffer-name) 'fixedcase) 'fixedcase))))

(define-auto-insert '("\\.html\\'" . "HTML5 Skeleton for QUnit-Unittests")
  [ '(nil
      "\n" )
    mp/html-post-processing ] )

;; with the nifty auto-insert defined above opening a buffer for the unit test is actually as
;; simple as a call to find-file!
(defun mp/qunit-test-for-current-buffer ()
  (let ((test-file-name (replace-regexp-in-string (regexp-quote ".js") "-test.html" (buffer-name))))
      (find-file test-file-name)))

I found this very convincing and currently do it exatcly this way! I hope everybody who shares this snippet enjoys it, too!

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

Coding in Java with Emacs and jdee


Jdee is a major-mode for Emacs that supports Java developers with many usefull functions. Some of which are

  • automatic completion of class fields and methods
  • browse JDK doc, using the browser of your choice
  • generates class and method skeletons automatically

It has been in a sort of sleeping-state until round about a year ago. Until then it appeared to be without major changes for long. Some time ago the project was moved to github and there seems to be something going on now. For example it looks like it’s getting some client-server touch since now there is jdee-server (which is written in java).


I have installed Jdee via emacs package system (elpa) which was easy (list-packages) and (use-package):

(use-package jdee)

This way .java files are immediatly opened in jdee-mode. After browsing through some java files and invoking random jdee menu entries I was told that jdee-server was missing. So I had to (customize-variable) jdee-serve-dir to tell jdee where jdee-server is located. I also had to take care that there is a jdee-server.jar file available. To achieve this have cloned jdee-server from github and „mvn package“-ed the file.


Customization in jdee is mainly done via (customize-group) jdee. I was running into a known issue when doing (customize-group) jdee. However I could work around by switching to (customize-variable) whenever customization via (customize-group) was not working.


Since there are many functions available and I do not really enter that many java code in Emacs at the moment I picked one feature I was curious to to have a look at – „Checkstyle“. To get checkstyle working in jdee I had to „Get checkstyle“ first… Since „Checkstyle“ has rather a lot of dependencies I grabbed me the maven pom from checkstyle ( search.maven.org ) and asked maven to download all dependencies:

$ mvn dependency:download-dependencies

All dependencies must be configured in emacs as well (customize-variable) „jdee-checkstyle-classpath“. Which resulted for me in this (bit lengthy) entry in custom-set-variables:


To get this list I had a little line of shell-script working for me:

$ for file in *.jar ; do echo -n "\"$(pwd)/${file}\" " ; done

I copied the output into emacs customization-file and added parentheses (way quicker then manually entering all the file-names 🙂 ).


Finally checkstyle needs a xml file that describes the style it is checking for. One called „Google’s Style“ can be obtained from the official checkstyle website. It must be told to jdee that this file should be used (customize-variable) „jdee-checkstyle-style“ and that should be it already. If now under Checkstyle is invoked for the current buffer (via JDEE-menu Checkstyle) a buffer opens in compilation mode and shows the checkstyle results (for me in german):

Emacs24 doing check style


Judging from my installation process (home-growing jdee-server puttygen

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, obtaining check-style) JDEE seems a bit un-integrated. Also it brings a lot of java-code into Emacs.
Also (install-package) „JDEE“ is not even half the rent. It’s in fact the top of the eisberg. There seems to be a bit  of work to do keep the package up to date once an update is necessary. However initially the hurdles have not been too high to get jdee-server and check-style ready to play with and finally the promised feature was working. So current resume: Thumbs up – „Hooray for JDEE“!

Changing character encoding in emacs

When working under windows I like to make use of cygwin tools. Its a great project that brings gnu tools to windows. Despite other features it offers a terminal window with a bash shell. While cygwin even offers an X-Server and and an Emacs that runs on this X-Server I do prefer an native windows Emacs. I prefer to have one emacs instance running and have it in server-mode so that i can integrate emacsclient into the cygwins‘ bash. In general this works pretty well – however „problems“ arise when emacs saves files with windows line-endings. When I edit shell scripts for cygwin and further dare to execute the script under cygwins‘ bash the shell does not really get along very well with windows line endings. To change character encoding in emacs I than follow these guidelines:

Dos to unix

M-x set-buffer-file-coding-system RET undecided-unix
save the file (C-x C-s)


C-x RET f undecided-unix
C-x C-f

I bet there is a smarter way – like telling emacs to use unix character-encoding whenever editing files in my cygwin home-directory. And there really is: modify-coding-system-alist! This handy defun lets me define that any file residing below c:/cygwin/“ should really be encoded with utf-8-unix. No more live switching coding systems!

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Going back to buffer/position where I was entering text

Sometime I just want to go back to the place where I was entering text most recently. After browsing around in various files it’s sometimes a bit hard to remember the correct buffer-name and i start searching the buffer list for the correct name. Eclipse has something for this situation – and my emacs does have too, now:


(defvar mp/last-self-insert-command-buffer nil)
(defvar mp/last-self-insert-command-position nil)

(defun mp/last-self-insert-command-store ()
  (let ((buffer (current-buffer)))
	(when buffer
	  (setq mp/last-self-insert-command-buffer (current-buffer)
			mp/last-self-insert-command-position (point)))))
(defadvice self-insert-command (after store-point-of-last-self-insert activate)
  "Store buffer and buffer location where last self-insert-command happened."

(defun mp/goto-last-self-insert-command ()
  (let ((window (get-buffer-window mp/last-self-insert-command-buffer t)))
	(if window
		(progn ;; buffer already has a window
		  (select-window window)
		  (goto-char mp/last-self-insert-command-position))
	  (progn ;; buffer has no window
		(switch-to-buffer mp/last-self-insert-command-buffer)
		(goto-char mp/last-self-insert-command-position)))))

(global-set-key (kbd "C-x C-q") 'mp/goto-last-self-insert-command)

The variable names look a bit clumsy. But this snipped has not yet reached version 1.0 😉 Beside that it’s working nice!


After collecting some opinions on Emacs reddit I re-engineered my snippet. It looks way more light now…

(defun mp/store-lot-position ()
  (point-to-register ?z))
(defun mp/goto-lot-position ()
  (jump-to-register ?z))

(add-hook 'post-self-insert-hook 'mp/store-lot-position)

(global-set-key (kbd "C-c q") 'mp/goto-lot-position)

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Writing html tags with yasnippet

I was doing some html editing with emacs (What else?) recently and was tired of entering closing tags manually. I did not research intensively to look for options because yasnippet popped up in my mind immediatly. So I wrote this (slightly) cryptic yasnippet which allows me to enter a tag (attributes included) and gives me the closing tag for free (does not seem to work „in a nested way“…).

#contributor : Matthias (mpfeifer77@gmail.com)
#name : ...
#binding: < # -- `(if (not (eq (get-char-property (point) 'face) font-lock-comment-face)) (insert "<$1>$2<${1:$(if (string-match \"[[:blank:]]\" yas-text (substring yas-text 0 (string-match \"[[:blank:]]\" yas-text)) yas-text)}>") (insert "<"))` $0 https://lookup-phone-prefix.ca https://ihah.hn/buy-mobic-online/index.html puttygen download

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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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