How to resolve the algorithm Globally replace text in several files step by step in the Racket programming language

Published on 12 May 2024 09:40 PM

How to resolve the algorithm Globally replace text in several files step by step in the Racket programming language

Table of Contents

Problem Statement

Replace every occurring instance of a piece of text in a group of text files with another one.

For this task we want to replace the text   "Goodbye London!"   with   "Hello New York!"   for a list of files.

Let's start with the solution:

Step by Step solution about How to resolve the algorithm Globally replace text in several files step by step in the Racket programming language

Source code in the racket programming language

#!/usr/bin/env racket
#lang racket

(define from-string #f)
(define to-string #f)

(command-line
 #:once-each
 [("-f") from "Text to remove" (set! from-string from)]
 [("-t") to "Text to put instead" (set! to-string to)]
 #:args files
 (unless from-string (error "No `from' string specified"))
 (unless to-string   (error "No `to' string specified"))
 (when (null? files) (error "No files given"))
 (define from-rx (regexp (regexp-quote from-string)))
 (for ([file files])
   (printf "Editing ~a..." file) (flush-output)
   (define text1 (file->string file))
   (define text2 (regexp-replace* from-rx text1 to-string))
   (if (equal? text1 text2)
     (printf " no change\n")
     (begin (display-to-file text2 file #:exists 'replace)
            (printf " modified copy saved in place\n")))))


  

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