[Openmcl-devel] How to use lisp program in unix pipeline

[Sven Van Caekenberghe]

On Wednesday, May 7, 2003, at 06:04 PM, Frank Sonnemans wrote:

> Hello all,
>
> I wrote a small lisp application which takes an xml file, filters it 
> and
> writes a html file. What I now want to do is use this lisp application 
> in
> several ways:
>
> Myfilter infile outfile
>
> Or
>
> Myfilter < infile > outfile
>
> Or
>
> Cat infile | Myfilter > outfile
>
> How do I do this with openmcl. As the startup time of openmcl is very 
> short
> I would basically like to use it to replace my unreadable perl scripts.
>
> So far I got some results using a construct like:
>
> Cat Myfilter.lisp | openmcl -b
>
> Problem is that openmcl outputs it's welcome message and prompt before 
> the
> output of my lisp program (see bottom of this message for example). 
> This is
> unsuitable for the type of use I have in mind. Can I suppress the 
> prompt and
> welcome message?

With my simple XML parser installed in ~/cvs/svc/xml I created the 
following lisp code:

(load #p"home:cvs;svc;xml;xml")
(load #p"home:cvs;svc;xml;dom")
(load #p"home:cvs;svc;xml;lxml-dom")

(defun xml2lxml ()
   (pprint (xml:parse-xml *standard-input* :output-type :lxml))
   (terpri)
   (finish-output *standard-output*)
   (quit))

And saved it in a file called xml2lxml.lisp. With the following source 
XML:

<!-- $Id: build.xml,v 1.1 2000/11/22 20:16:49 sven Exp $ -->
<!-- Ant 1.2 build file -->

<project name="SwingTest" default="jar" basedir=".">

   <!-- set global properties for this build -->
   <property name="src" value="${basedir}/src" />
   <property name="build" value="${basedir}/bin" />

   <target name="prepare">
     <!-- Create the time stamp -->
     <tstamp/>
     <!-- Create the build directory structure used by compile -->
     <mkdir dir="${build}" />
   </target>

   <target name="compile" depends="prepare">
     <!-- Compile the java code from ${src} into ${build} -->
     <javac srcdir="${src}" destdir="${build}" debug="on" />
   </target>

   <target name="copy-rsrc" depends="prepare">
     <!-- Copy various resource files into ${build} -->
     <copy todir="${build}">
       <fileset
         dir="${basedir}"
         includes="images/*.gif" />
     </copy>
   </target>

   <target name="jar" depends="compile,copy-rsrc">
     <!-- Put everything in ${build} into the a ${name}.jar file -->
     <jar
       jarfile="${basedir}/SwingTest.jar"
       basedir="${build}"
       manifest="${basedir}/SwingTest.mf"/>
   </target>

   <target name="run" depends="compile,copy-rsrc">
     <!-- Execute the main application -->
     <java
       classname="be.beta9.swingtest.SwingTest"
       fork="yes"
       classpath="${build}" />
   </target>

   <target name="clean">
     <!-- Delete the ${build} directory trees -->
     <delete dir="${build}" />
   </target>

</project>

in a file called build.xml I can now do

[sven at voyager:~/tmp]$ cat build.xml | openmcl -l xml2lxml -e 
'(xml2lxml)'

which produces the following LXML output and exits:

((:|project| :|name| "SwingTest" :|default| "jar" :|basedir| ".")
  ((:|property| :|name| "src" :|value| "${basedir}/src"))
  ((:|property| :|name| "build" :|value| "${basedir}/bin"))
  ((:|target| :|name| "prepare") :|tstamp| ((:|mkdir| :|dir| 
"${build}")))
  ((:|target| :|name| "compile" :|depends| "prepare")
   ((:|javac| :|srcdir| "${src}" :|destdir| "${build}" :|debug| "on")))
  ((:|target| :|name| "copy-rsrc" :|depends| "prepare")
   ((:|copy| :|todir| "${build}")
    ((:|fileset| :|dir| "${basedir}" :|includes| "images/*.gif"))))
  ((:|target| :|name| "jar" :|depends| "compile,copy-rsrc")
   ((:|jar| :|jarfile| "${basedir}/SwingTest.jar" :|basedir| "${build}"
     :|manifest| "${basedir}/SwingTest.mf")))
  ((:|target| :|name| "run" :|depends| "compile,copy-rsrc")
   ((:|java| :|classname| "be.beta9.swingtest.SwingTest" :|fork| "yes"
     :|classpath| "${build}")))
  ((:|target| :|name| "clean") ((:|delete| :|dir| "${build}"))))

> Secondly how do I access the command line parameters from my lisp 
> program?

In a previous post (the factorial command line example) I showed one, 
simple way to do that (using a shell script to take the command line 
arguments and push them in the -e expression).

HTH,

Sven


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