Visualize makefile

Simply copy code from this r-blogger post.

library(tm)

## Loading required package: NLP

library(igraph)

## 
## Attaching package: 'igraph'

## The following objects are masked from 'package:stats':
## 
##     decompose, spectrum

## The following object is masked from 'package:base':
## 
##     union

## Read makefile into R
makefile <- readLines("/tmp/makefile.1")


## Find relevant lines in makefile
dep <- grep(":", makefile, value = TRUE)

## Select target files
target <- gsub(":.*", "", dep)

## Select files target depends on
depends <- gsub(".*:", "", dep)
depends <- strsplit(depends, " ")
names(depends) <- target


## Create a dependency matrix (using igraph package)
dlist <- lapply(target, function(t) {
  d <- if(length(depends[[t]]) == 0) NA else depends[[t]]
  data.frame(depends = d, target = t)
})
dependencymat <- na.omit(do.call("rbind", dlist))
dependencymat <- dependencymat[dependencymat$depends != "", ]                         
makegraph <- graph.data.frame(dependencymat)

## ... and plot
plot(makegraph, vertex.shape = "none", edge.arrow.size = 0.5)