bedtools_shift: bedtools_shift
In HelloRanges: Introduce *Ranges to bedtools users

Description Usage Arguments Details Value Author(s) References See Also Examples

Compute shifting regions.

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bedtools_shift(cmd = "--help")
R_bedtools_shift(i, s = 0, m = 0, p = 0, pct = FALSE, g = NULL, header = FALSE)
do_bedtools_shift(i, s = 0, m = 0, p = 0, pct = FALSE, g = NULL, header = FALSE)

`cmd`	String of bedtools command line arguments, as they would be entered at the shell. There are a few incompatibilities between the docopt parser and the bedtools style. See argument parsing.
`i`	Path to a BAM/BED/GFF/VCF/etc file, a BED stream, a file object, or a ranged data structure, such as a GRanges. Use `"stdin"` for input from another process (presumably while running via `Rscript`). For streaming from a subprocess, prefix the command string with “<”, e.g., `"<grep foo file.bed"`. Any streamed data is assumed to be in BED format.
`s`	Amount to shift all features.
`m`	Amount to shift negative strand features.
`p`	Amount to shift positive strand features.
`pct`	Define `l` and `r` as a fraction of the feature length. E.g. if used on a 1000bp feature, and `l` is 0.50, will shift 500 bp upstream..
`g`	Genome file, identifier or Seqinfo object that defines the order and size of the sequences.
`header`	Ignored.

As with all commands, there are three interfaces to the shift command:

bedtools_shift: Parses the bedtools command line and compiles it to the equivalent R code.
R_bedtools_shift: Accepts R arguments corresponding to the command line arguments and compiles the equivalent R code.
do_bedtools_shift: Evaluates the result of R_bedtools_shift. Recommended only for demonstration and testing. It is best to integrate the compiled code into an R script, after studying it.

This is a fairly straight-forward application of shift.

A language object containing the compiled R code, evaluating to a GRanges, or similar, object. In principle, this is an endomorphism.

Michael Lawrence

http://bedtools.readthedocs.io/en/latest/content/tools/shift.html

intra-range-methods for shift.

## Not run: 
setwd(system.file("unitTests", "data", "shift", package="HelloRanges"))

## End(Not run)
## shift all ranges by 5
bedtools_shift("-i a.bed -s 5 -g tiny.genome")
## shift only the negative strand features by 5
bedtools_shift("-i a.bed -p 0 -m 5 -g tiny.genome")