RunCmdForNewerInput: Run a command if input files are newer than outputs

Description

Run a command if input files are newer than outputs

Usage

RunCmdForNewerInput(
  cmd,
  infiles,
  outfiles,
  Verbose = FALSE,
  UseLock = FALSE,
  Force = FALSE,
  ReturnInputTimes = FALSE,
  ...
)

Value

logical indicating if cmd was run or for an R expression, eval(cmd)

Arguments

cmd: An expression, a string or NA/NULL
infiles: Character vector of path to one or more input files
outfiles: Character vector of path to one or more output files
Verbose: Write information to consolse (Default FALSE)
UseLock: Stop other processes working on this task (Default FALSE)
Force: Ignore file modification times and always produce output if input files exist.
ReturnInputTimes: Return mtimes of input files (default FALSE)
...: additional parameters passed to system call.

Details

cmd can be an R expression, which is evaluated if necessary in the environment calling RunCmdForNewerInput, a string to be passed to system or NULL/NA in which cases the files are checked and TRUE or FALSE is returned depending on whether action is required.

When UseLock=TRUE, the lock file created is called outfiles[1].lock

When ReturnInputTimes=TRUE, the input mtimes are returned as an attribute of a logical value (if available).

Examples

Run this code

if (FALSE) {
RunCmdForNewerInput(expression(myfunc("somefile")))
}