LR.prj_path: Discover standard LR project directory hierarchy.
In slonik-az/LRutil: Useful utilities by Leo Razoumov.

Description Usage Arguments Value Examples

Discover standard LR project directory hierarchy. prj_root marker file (.PRJ_ROOT by default) must exist in the project root directory.

1	LR.prj_path(prj_root = NULL, marker = ".PRJ_ROOT")

`prj_root`	Project Root directory if string. if `NULL` or `FALSE` – auto-discover from current working directory `getwd()`. if `TRUE` – (only use in scripts, never directly in console!) auto-discover from the path of the script being executed or sourced, otherwise `getwd()`.
`marker`	Project root marker file. Must exist in the project root directory.

List of essential project subdirs as functions that when called with a filename produce the correspinding path; when called without a filename return the path to the subdir itself; see Examples for details.

`root`	- project root
`ana`	- Data Analysis (src/ana)
`dat`	- Data directory (dat)
`dat_raw`	- Raw data directory (dat/raw)
`doc`	- Documentation directory (doc)
`lib`	- Local Library (lib)
`lib_R`	- Local R Library (lib/R)
`mng`	- Data Munging/Wrangling (src/mng)
`rpt`	- Reports (doc/rpt)
`src`	- Source tree (src)
`src_lib`	- Common code under Source tree (src/lib)
`pkg`	- In case some code is made into R-packages (pkg)

## Not run: 
if(!exists('prj')){ prj <- LRutil::LR.prj_path() }
prj$root()  # return prj_root
prj$root('readme') # returns path to prj_root/readme
prj$dat_raw('foo.csv') #returns path to prj_root/dat/raw/foo.csv
prj$src('subdir','test','t.R') #returns path to prj_root/src/subdir/test/t.R
prj$src(c('a.R','b.R')) #returns vector c('prj_root/src/a.R','prj_root/src/b.R')

## End(Not run)