Change a source file in place

Source: R/utils.R

Utility function to make changes to a source file

gp_change_file(
  path = system.file("js/src/App.js", package = "geoplumber"),
  what = " * geoplumber R package code.",
  pattern = " * geoplumber R package code.",
  before = TRUE,
  replace = FALSE,
  verbose = FALSE
)

Arguments

path

path of file to change, used in readLines()
what

vector to add to path
pattern

where to add the what to, 1st is used. Unique is best.
before

s after the pattern
replace

or replace pattern
verbose

cat the change out

Examples

{
 gp_change_file(replace = TRUE, verbose = TRUE) # replacing the comment itself.
}

#> [1] "Changed at: 2"
#> [1] " * geoplumber R package code."                    
#> [2] " */"                                              
#> [3] "import React, { Component } from 'react';"        
#> [4] "import { Switch, Route } from 'react-router-dom';"
#> [5] ""                                                 
#> [6] "import Welcome from './Welcome';"