@node Development Tools
@appendix Development Tools

Here are some tools that you might find useful while developing code.

@menu
* Tags::
* cscope::
* Git::
@ifset recommendvnc
* VNC::
@end ifset 
@ifset recommendcygwin
* Cygwin::
@end ifset
@end menu

@node Tags
@section Tags

Tags are an index to the functions and global variables declared in a
program.  Many editors, including Emacs and @command{vi}, can use
them.  The @file{Makefile} in @file{pintos-ic/src} produces Emacs-style
tags with the command @code{make TAGS} or @command{vi}-style tags with
@code{make tags}.

In Emacs, use @kbd{M-.} to follow a tag in the current window,
@kbd{C-x 4 .} in a new window, or @kbd{C-x 5 .} in a new frame.  If
your cursor is on a symbol name for any of those commands, it becomes
the default target.  If a tag name has multiple definitions, @kbd{M-0
M-.} jumps to the next one.  To jump back to where you were before
you followed the last tag, use @kbd{M-*}.

@node cscope
@section cscope

The @command{cscope} program also provides an index to functions and
variables declared in a program.  It has some features that tag
facilities lack.  Most notably, it can find all the points in a
program at which a given function is called.

The @file{Makefile} in @file{pintos-ic/src} produces @command{cscope}
indexes when it is invoked as @code{make cscope}.  Once the index has
been generated, run @command{cscope} from a shell command line; no
command-line arguments are normally necessary.  Then use the arrow
keys to choose one of the search criteria listed near the bottom of
the terminal, type in an identifier, and hit @key{Enter}.
@command{cscope} will then display the matches in the upper part of
the terminal.  You may use the arrow keys to choose a particular
match; if you then hit @key{Enter}, @command{cscope} will invoke the
default system editor@footnote{This is typically @command{vi}.  To
exit @command{vi}, type @kbd{: q @key{Enter}}.} and position the
cursor on that match.  To start a new search, type @key{Tab}.  To exit
@command{cscope}, type @kbd{Ctrl-d}.

Emacs and some versions of @command{vi} have their own interfaces to
@command{cscope}.  For information on how to use these interface,
visit @url{http://cscope.sourceforge.net, the @command{cscope} home
page}.

@node Git
@section Git

Git is a version-control system.  That is, you can use it to keep
track of multiple versions of files.  The idea is that you do some
work on your code and test it, then commit it  into the version-control
system.  If you decide that the work you've done since your last
commit is no good, you can easily revert to the last version.
Furthermore, you can retrieve any old version of your code
as of some given day and time.  The version control logs tell you who
made changes and when.

Whilst Git may not be everyone's preferred version control system, it's
free, has a wealth of documentation, and is easy to install on most
Unix-like environments.

For more information, visit the @uref{https://www.git-scm.com/, , Git 
home page}.

@include localgitinstructions.texi

@ifset recommendvnc
@node VNC
@section VNC

VNC stands for Virtual Network Computing.  It is, in essence, a remote
display system which allows you to view a computing ``desktop''
environment not only on the machine where it is running, but from
anywhere on the Internet and from a wide variety of machine
architectures.  It is already installed on the lab machines.  
For more information, look at the @uref{http://www.realvnc.com/, , VNC
Home Page}.
@end ifset

@ifset recommendcygwin
@node Cygwin
@section Cygwin

@uref{http://cygwin.com/, ,Cygwin} provides a Linux-compatible environment
for Windows.  It includes ssh client and an X11 server, Cygwin/X.  If your
primary work environment is Windows, you will find Cygwin/X extremely
useful for these tasks.  Install Cygwin/X, then start the X server
and open a new xterm.  The X11 server also allows you to run pintos while
displaying the qemu-emulated console on your Windows desktop.
@end ifset

@localdevelopmenttools{}