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Schlagwort: Java

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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Eclipse formatiert Quellcode

Die bekannte Entwicklungsumgebung Eclipse formtiert auch Quellcode. Die Formatierung läßt sich über Eclipse Preferences einstellen. So siehts aus (Klick für größere Darstellung):
2015-05-19 18_39_02-Preferences
Hat man sein Format definiert und möchte es auch einhalten bietet es sich an eine SaveAction zu definieren https://puttygen.in , die sich darum kümmert. Ohne SaveAction lässt sich der Quellcode einfach über Strg-A und dann Strg-shift-f „assimiliert“ die aktuelle Datei in das eigene Format.

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