useful commit hooks for R package dev

post-commit

#!/usr/bin/env Rscript

# License: CC0 (just be nice and point others to where you got this)
# Author: Robert M Flight <rflight79@gmail.com>, github.com/rmflight
#
# This is a post-commit hook that after a successful commit subsequently increments the package version in DESCRIPTION
# and commits that. Analogous to the pre-commit at https://gist.github.com/rmflight/8863882, but useful if you only have
# good reasons for not doing it on the pre-commit.
#
# To install it, simply copy this into the ".git/hooks/post-commit" file of your git repo, change /path/2/Rscript, and make
# it executable. Note that /path/2/Rscript is the same as your /path/2/R/bin/R, or may be in /usr/bin/Rscript depending on 
# your installation. This has been tested on both Linux and Windows installations.
#
# In instances where you do NOT want the version incremented, add the environment variable doIncrement=FALSE to your git 
# call. eg "doIncrement=FALSE git commit -m "commit message"". 
# This is useful when you change the major version number for example.

doIncrement <- TRUE # default

# get the environment variable and modify if necessary
tmpEnv <- as.logical(Sys.getenv("doIncrement"))
if (!is.na(tmpEnv)){
  doIncrement <- tmpEnv
}

if (doIncrement){

  currDCF <- read.dcf("DESCRIPTION")
  currVersion <- currDCF[1,"Version"]
  splitVersion <- strsplit(currVersion, ".", fixed=TRUE)[[1]]
  nVer <- length(splitVersion)
  currEndVersion <- as.integer(splitVersion[nVer])
  newEndVersion <- as.character(currEndVersion + 1)
  splitVersion[nVer] <- newEndVersion
  newVersion <- paste(splitVersion, collapse=".")
  currDCF[1,"Version"] <- newVersion
  if ("Date" %in% colnames(currDCF)) currDCF[1, "Date"] <- strftime(as.POSIXlt(Sys.Date()), "%Y-%m-%d")
  write.dcf(currDCF, "DESCRIPTION")
  system("git add DESCRIPTION")
  system('doIncrement=FALSE git commit -m "increment package version"') # doIncrement=FALSE is required, otherwise we end up in an infinite loop
  cat("Incremented package version and committed!\n")
}

pre-commit

#!/usr/bin/env Rscript

# License: CC0 (just be nice and point others to where you got this)
# Author: Robert M Flight <rflight79@gmail.com>, github.com/rmflight
#
# This is a pre-commit hook that checks that there are files to be committed, and if there are, increments the package version
# in the DESCRIPTION file. 
#
# To install it, simply copy this into the ".git/hooks/pre-commit" file of your git repo, change /path/2/Rscript, and make it
# executable. Note that /path/2/Rscript is the same as your /path/2/R/bin/R, or may be in /usr/bin/Rscript depending on your
# installation. This has been tested on both Linux and Windows installations.
#
# In instances where you do NOT want the version incremented, add the environment variable doIncrement=FALSE to your git call.
# eg "doIncrement=FALSE git commit -m "commit message"". 
# This is useful when you change the major version number for example.

doIncrement <- TRUE # default

# get the environment variable and modify if necessary
tmpEnv <- as.logical(Sys.getenv("doIncrement"))
if (!is.na(tmpEnv)){
  doIncrement <- tmpEnv
}

# check that there are files that will be committed, don't want to increment version if there won't be a commit
fileDiff <- system("git diff HEAD --name-only", intern=TRUE)

# doIncrement except if there is a staged DESCRIPTION with manual version update
if ("DESCRIPTION" %in% fileDiff) {
  # Don't want to overwrite manual version bump
  desc_diff <- system("git diff HEAD DESCRIPTION", intern = TRUE)
  doIncrement <- !any(grepl("\\+Version", desc_diff))
  staged_files <- system("git diff HEAD --name-only --staged", intern = TRUE)

  if (!"DESCRIPTION" %in% staged_files) {
    if (doIncrement) cat("DESCRIPTION had additional changes that were committed.\n")
    else cat("DESCRIPTION contains manual version bump but was not staged, so it was not committed.\n")
  } 
}


if ((length(fileDiff) > 0) && doIncrement){

  currDCF <- read.dcf("DESCRIPTION")
  currVersion <- currDCF[1,"Version"]
  splitVersion <- strsplit(currVersion, ".", fixed=TRUE)[[1]]
  nVer <- length(splitVersion)
  currEndVersion <- as.integer(splitVersion[nVer])
  newEndVersion <- as.character(currEndVersion + 1)
  splitVersion[nVer] <- newEndVersion
  newVersion <- paste(splitVersion, collapse=".")
  currDCF[1,"Version"] <- newVersion
  if ("Date" %in% colnames(currDCF)) currDCF[1, "Date"] <- strftime(as.POSIXlt(Sys.Date()), "%Y-%m-%d")
  write.dcf(currDCF, "DESCRIPTION")
  system("git add DESCRIPTION")
  cat("Incremented package version and added to commit!\n")
}