Presents your 
JAVA E-NEWSLETTER for August 22, 2002

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JAVA DEVELOPMENT FROM THE COMMAND LINE

Developers have long been split between the Mac/Windows world of
point-and-click and the UNIX world of command-line programming. With 
the advent
of OS X on the Mac and the existence of the Cygwin application on
Windows, Mac and Windows users can use UNIX command-line power at the 
same time
they use Mac/Windows point-and-click simplicity.

There are different command-line environments. Currently, the most
popular ones are bash, tcsh, and zsh. We'll use the bash command line 
for our
examples.

The first script is all about making life easier for simple
environments. This compilation is done from the command line:

jikes com/generationjava/example/FirstClass.java

Rather than typing java com.generationjava.examples.FirstClass to test
this code, why not use the javad function and the !:1 syntax?

javad !:1

The !:1 tells the system to repeat the first argument from the line
above, starting at zero, and that javad is a simple command-line 
function:

# Run a file from its source filename and not just its
# fully qualified class name.
function javad( ) {
   source=$1
   shift 1
   java `echo ${source} | sed 's/\.java$//' | sed 's/\//./g'` $*
}

Those of us who are particularly lazy might want to compile every Java
source file in a directory. We can accomplish this with javacdir com/
using the following javacdir function.

# Compile everything in a directory.
# change javac to jikes if need be
function javacdir( ) {
   jikes `find $1 -path '*.java'` 2>&1 | more
}

When we run javacdir, we get a bunch of errors, which might make it
difficult to tell which classes didn't compile. So we want to list out 
all
the source files that don't have a class file yet. Let's use the 
missingc
function with missingc com/:

function missingc( ) {
    for i in `findj $1`
    do
        if [ -e `echo $i | sed 's/java$/class/'` ]; then
            echo XXXX
        else
            echo $I
        fi
    done | grep -v 'XXXX'
}

This will list all java source files that still lack a class file.
Installing these functions involves adding them to a text file and 
running the
source command on the text file.

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