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Written by Oleksandr Gavenko (AKA gavenkoa), compiled on 2017-01-30 from rev ccaa2f364422+.

Pretty print source code.

About pretty printing.

Code formatter, beautifier, pretty printer.

http://en.wikipedia.org/wiki/Pretty-printer
Wiki article.

xml.

tidy.

$ tidy -xml -i -utf8 -o out.xml in.xml

or in Emacs:

C-x h C-x <RET> c utf-8 <RET> C-u M-| tidy -q -xml -i -utf8 -

http://tidy.sourceforge.net
              Home page.
http://www.emacswiki.org/cgi-bin/wiki/tidy.el
              Emacs bindings.

xmllint.

$ xmllint --format file.xml

or in Emacs:

: C-x h C-u M-| xmllint --format - <RET>

Emacs and nxml.

You need introduce line-breaks and then:

C-x h C-M-\

c/c++/java/c#.

Artistic Style, astyle.

A Free, Fast and Small Automatic Formatter for C, C++, C#, and Java Source Code.

There are exist package for Cygwin, Debian.

http://astyle.sourceforge.net/
home page

Uncrustify.

Source Code Beautifier for C, C++, C#, ObjectiveC, D, Java, Pawn and VALA.

Exist package for Windows (binary from home page), Debian.

http://uncrustify.sourceforge.net/
home page

jpplib.

Pretty Printer Library.

http://jpplib.sourceforge.net/
Home page.

Perl.

http://perltidy.sourceforge.net/
Home page.