How to list recursive package dependency prior to installation/upgrade of a package

That is great! 

Is there a way to know version required in the dependent packages? 


From: "William Dunlap" <wdunlap at tibco.com> 
To: "Sebastien Bihorel" <sebastien.bihorel at cognigencorp.com> 
Cc: r-help at r-project.org 
Sent: Thursday, March 14, 2019 3:50:58 PM 
Subject: Re: [R] How to list recursive package dependency prior to installation/upgrade of a package

tools::package_dependencies("lme4") 

$lme4 
[1] "Matrix" "methods" "stats" "graphics" "grid" "splines" 
[7] "utils" "parallel" "MASS" "lattice" "boot" "nlme" 
[13] "minqa" "nloptr" "Rcpp" "RcppEigen"

tools::package_dependencies("lme4", recursive=TRUE) 

$lme4 
[1] "Matrix" "methods" "stats" "graphics" "grid" "splines" 
[7] "utils" "parallel" "MASS" "lattice" "boot" "nlme" 
[13] "minqa" "nloptr" "Rcpp" "RcppEigen" "grDevices" 

Use reverse=TRUE to list packages that depend on the given package. 
Bill Dunlap 
TIBCO Software 
wdunlap [ http://tibco.com/ | tibco.com ]

Hi 

Is there an elegant way to recursive list all dependencies of a package prior to its installation or upgrade? 

I am particularly interested in finding which of the packages currently installed in my test/production environment would require an upgrade prior to actual installation/upgrade of a package. 

Can the packrat package help with this? 

Thank you 

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