how to use "r --eval" in bash? - r

Question

I want to run the R code from here for bash:
git log --format=format:%cd --date=short --shortstat --no-merges master \
| paste - - - | sort --key 1 | sed '$a\\' \
| awk --field-separator "\t" '
$1 != date { print date, ins, del; date = $1; ins = 0; del = 0; }
{ match($2, /([0-9]+) ins/, m); ins += m[1];
match($2, /([0-9]+) del/, m); del += m[1]; }' \
| R --eval '
library("makeR")
attach(read.table(textConnection(readLines("stdin"))))
png("heatmap.png")
calendarHeat(V1, sapply(pmax(V2, V3), log))'
But there is no r --eval command at my bash, it says:
WARNING: unknown option '--eval'
How should I run this?

Answer 1

This definitely works. Here is a quick ad-hoc shell script I made of your snippet:
#!/bin/sh
git log --format=format:%cd --date=short --shortstat --no-merges master | \
paste - - - | sort --key 1 | sed '$a\\' | \
awk --field-separator "\t" \
'$1 != date { print date, ins, del; date = $1; ins = 0; del = 0; }
{ match($2, /([0-9]+) ins/, m); ins += m[1];
match($2, /([0-9]+) del/, m); del += m[1]; }' | \
r -lmakeR -e'X <- read.table(textConnection(readLines("stdin"))); \
png("heatmap.png"); \
calendarHeat(X$V1, sapply(pmax(X$V2, X$V3), log)); \
dev.off()'
which, when running in the repo our Rblpapi project, produces the image below.
I do use two littler features here: -l to load a package (here makeR which I had to install from its archive, and -e ... for an expression. In R we would just prepend library(makeR) to the expression string...