process_file: Read a text file, process the text with a function, and write...

Description Usage Arguments Details Value Examples

View source: R/io.R

Description

Read a text file with the UTF-8 encoding, apply a function to the text, and write back to the original file.

Usage

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Arguments

file

Path to a text file.

fun

A function to process the text.

x

The content of the file.

...

Arguments to be passed to process_file().

Details

sort_file() is an application of process_file(), with the processing function being sort(), i.e., it sorts the text lines in a file and write back the sorted text.

Value

If file is provided, invisible NULL (the file is updated as a side effect), otherwise the processed content (as a character vector).

Examples

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f = tempfile()
xfun::write_utf8("Hello World", f)
xfun::process_file(f, function(x) gsub("World", "woRld", x))
xfun::read_utf8(f)  # see if it has been updated
file.remove(f)

Example output

Attaching package:xfunThe following objects are masked frompackage:base:

    attr, isFALSE

[1] "Hello woRld"
[1] TRUE

xfun documentation built on June 16, 2021, 1:07 a.m.