reprex.sh: poor man's reprex

reprex.sh is a bash script that creates a reprex from a shell script. It:

• runs R given an R script (possibly from stdin)
• outputs the R commands
• outputs the output from R after comment # symbols

Requires: bash

Example

Given an R script file, buf.R that contains

library(terra)
v = vect("LINESTRING(0 85,1 85)") 
crs(v) = 'EPSG:4326'
v
(b = buffer(v, 10000))

run the script with

reprex.sh buf.R

to get the following output:

library(terra)
# terra 1.7.35
v = vect("LINESTRING(0 85,1 85)")
crs(v) = 'EPSG:4326'
v
#  class       : SpatVector
#  geometry    : lines
#  dimensions  : 1, 0  (geometries, attributes)
#  extent      : 0, 1, 85, 85  (xmin, xmax, ymin, ymax)
#  coord. ref. : lon/lat WGS 84 (EPSG:4326)
(b = buffer(v, 10000))
#  class       : SpatVector
#  geometry    : polygons
#  dimensions  : 1, 0  (geometries, attributes)
#  extent      : -1.027163, 2.027163, 84.91046, 85.08954  (xmin, xmax, ymin, ymax)
#  coord. ref. :

(example taken from here). With this reprex, anyone can see which R commands were run, and what output it generated, and try to reproduce it, by:

• re-running it in R by copy-and-paste, because the R output follows # and is interpreted as comment
• comparing the output thus obtained with the output shown in the reprex

Installation

Put the reprex.sh shell script somewhere in your search path. Make sure it has executable permissions, noted by the x in -rwxr-xr-x:

$ ls -la reprex.sh
-rwxr-xr-x 1 edzer edzer 107 Jun 14 13:10 reprex.sh