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GNU Make is a standard tool to define transformation rules. Each rule consists of a (list of) targets which may depend on one or more source files, and optionally a script that needs to be executed to create the target. A Makefile is essentially a collection of such rules.

Make figures out automatically which files it needs to update, based on which source files have changed. … As a result, if you change a few source files and then run Make, it does not need to [redo all the work]. It updates only those non-source files that depend directly or indirectly on the source files that you changed.

Make is readily available on all major platforms, also on Microsoft Windows. The MakefileR package helps creating Makefile files programmatically from R. The following sections show a few examples and the corresponding output.

Creating rules

library(MakefileR)
make_rule("all", c("first_target", "second_target"))
all: first_target second_target
make_rule(".FORCE")
.FORCE:
make_rule("first_target", ".FORCE", "echo 'Building first target'")
first_target: .FORCE
⇥      echo 'Building first target'
make_rule("second_target", "first_target",
  c("echo 'Building second target'", "echo 'Done'"))
second_target: first_target
⇥      echo 'Building second target'
⇥      echo 'Done'

Creating definitions

make_def("R_VERSION", R.version.string)
R_VERSION=R version 3.2.3 (2015-12-10)

Creating groups

make_group(make_comment("Definitions")) +
  make_def("R_VERSION", R.version.string) +
  make_def("R_PLATFORM", R.version$platform)
# Definitions
R_VERSION=R version 3.2.3 (2015-12-10)
R_PLATFORM=x86_64-pc-linux-gnu

Creating Makefile files

makefile() +
  make_group(
    make_comment("Definitions"),
    make_def("R_VERSION", R.version.string)
  ) +
  make_group(
    make_comment("Universal rule"),
    make_rule("all", c("first_target", "second_target"))
  ) +
  make_group(
    make_comment("Special rule"),
    make_rule(".FORCE")
  ) +
  make_comment(c("============", "Action rules", "============")) +
  make_rule("first_target", ".FORCE", "echo 'Building first target'") +
  make_rule("second_target", "first_target",
    c("echo 'Building second target'", "echo 'Done'"))
# Generated by MakefileR, do not edit by hand

# Definitions
R_VERSION=R version 3.2.3 (2015-12-10)

# Universal rule
all: first_target second_target

# Special rule
.FORCE:

# ============
# Action rules
# ============

first_target: .FORCE
⇥      echo 'Building first target'

second_target: first_target
⇥      echo 'Building second target'
⇥      echo 'Done'

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