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February 13, 2017 ยท View on GitHub
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- JDecomp
** Introduction
=jdecomp= provides an interface to various Java decompilers. The current supported decompilers are:
- [[http://www.benf.org/other/cfr/][CFR]]
- [[https://github.com/JetBrains/intellij-community/tree/master/plugins/java-decompiler/engine][Fernflower]]
- [[https://bitbucket.org/mstrobel/procyon][Procyon]]
** Installation
Install via [[https://melpa.org/#/][MELPA]].
For general information on installing Emacs packages, see the [[https://www.emacswiki.org/emacs/InstallingPackages][Emacs Wiki]].
** Setup
In your init file, add the following to activate =jdecomp-mode=:
#+BEGIN_SRC emacs-lisp (jdecomp-mode 1) #+END_SRC
Set customizable variable jdecomp-decompiler-type to a known decompiler type:
cfr(default)fernflowerprocyon
E.g.
#+BEGIN_SRC emacs-lisp (customize-set-variable 'jdecomp-decompiler-type 'fernflower) #+END_SRC
Set customizable variable jdecomp-decompiler-paths to decompiler paths. E.g.
#+BEGIN_SRC emacs-lisp
(customize-set-variable 'jdecomp-decompiler-paths
'((cfr . "/Downloads/cfr_0_118.jar")
(fernflower . "/idea-IC-162.1628.40/plugins/java-decompiler/lib/java-decompiler.jar")
(procyon . "~/procyon-decompiler-0.5.30.jar")))
#+END_SRC
Use =M-x jdecomp-mode= to turn the minor mode off, or call
#+BEGIN_SRC emacs-lisp (jdecomp-mode -1) #+END_SRC
** Features
*** Decompile classfiles
When =jdecomp-mode= is active, opening a [[https://en.wikipedia.org/wiki/Java_class_file][Java classfile]] (including those in JARs) automatically decompiles the file and displays the result in a preview buffer.
** Options
Set customizable variable jdecomp-decompiler-options to options for decompilers. E.g.
#+BEGIN_SRC emacs-lisp (customize-set-variable 'jdecomp-decompiler-options '((cfr "--comments false" "--removeboilerplate false") (fernflower "-hes=0" "-hdc=0"))) #+END_SRC
** Future work
Support more decompilers:
- [[https://github.com/nviennot/jd-core-java][JD-Core]]
- [[https://github.com/Storyyeller/Krakatau][Krakatau]] (Python)
Maybe [[others]]?
** Other
This package is inspired by [[https://github.com/gbalats/autodisass-java-bytecode][autodisass-java-bytecode]].