ℙ𝕖𝕡 🙴 ℕ𝕠𝕞

My words are like the stars that never change. Chief Seattle

the text input-stream in the ℙ𝕖𝕡/ℕ𝕠𝕞 system

About the role of the text input-stream when using ℙ𝕖𝕡 🙵 ℕ𝕠𝕞

Pep&Nom were designed to follow the usual Unix paradigm of filtering a text stream. That is, an input stream is provided to a Nom script which filters or transforms that stream and produces a text output-stream. Large numbers of Unix utility programs work like this (for example: sed, grep, awk, cut, uniq, sort ... ) and the system has the great advantage that the filter programs can be chained together with the pipe “|” operator to aggregate the results.

 tr ' ' '\n' the.entire.web.txt | sort | uniq > all.words.txt

This means that unix-style programs can do (in theory) one thing well and then be joined together with pipes to achieve almost anything. (Although if you look at the MAN pages for tools like sort you will soon see that this philosophy of “doing one thing well* has not been” rigorously adhered to).

But you can't do the following:

 cat /usr/share/dict/words | pep -f word.scramble.pss 

Well, you may say, what's with the whole “text-filter” philosophy. Unfortunately the pep interpreter needs to use <stdin> to open and compile the script (a pep-assembler script compiles the input script to assembler) and I never bothered to work out how to fork the input stream. And I haven't lost much sleep over it because once you translate a script to another language (with the scripts in the /tr translation folder ) then this problem just automagically goes away.

   pep -f tr/translate.py.pss eg/text.tohtml.pss > text.tohtml.py 
   chmod o+x text.tohtml.py
   cat dissertation.on.life.txt | ./text.tohtml.py
   # the output will be your dissertation on life formatted in 
   # beautiful html (like this website) printed to <stdout> 
 

So, once nom scripts have been translated, they can be used in the normal Unix text-filter way.