Read path — read_path • envsetup

Check each environment for the file and return the path to the first.

Usage

read_path(
  lib,
  filename,
  full.path = TRUE,
  envsetup_environ = Sys.getenv("ENVSETUP_ENVIRON")
)

Arguments

lib: object containing the paths for all environments of a directory
filename: name of the file you would like to read
full.path: logical to return the path including the file name
envsetup_environ: name of the environment you would like to read the file from; default values comes from the value in the system variable ENVSETUP_ENVIRON which can be set by Sys.setenv(ENVSETUP_ENVIRON = "environment name")

Value

string containing the path of the first directory the file is found

Details

The environments searched depends on the current environment. For example, if your workflow contains a development (dev) area and production area (prod), and the code is executing in the dev environment, we search dev and prod. If in prod, we only search prod.

Examples

tmpdir <- tempdir()

# account for windows
if (Sys.info()['sysname'] == "Windows") {
  tmpdir <- gsub("\\", "\\\\", tmpdir, fixed = TRUE)
}

# add config for just the data location
hierarchy <- paste0("default:
  paths:
    data: !expr list(
      DEV = file.path('",tmpdir,"', 'demo', 'DEV', 'username', 'project1', 'data'),
      PROD = file.path('",tmpdir,"', 'demo', 'PROD', 'project1', 'data'))")

# write config file to temp directory
writeLines(hierarchy, file.path(tmpdir, "hierarchy.yml"))

config <- config::get(file = file.path(tmpdir, "hierarchy.yml"))

# build folder structure from config
build_from_config(config)
#> ✔ Directories built
#> /tmp/RtmpKPwpGu/demo/
#> ├── DEV
#> │   └── username
#> │       └── project1
#> │           ├── data
#> │           ├── functions
#> │           ├── output
#> │           └── programs
#> └── PROD
#>     └── project1
#>         ├── data
#>         ├── functions
#>         ├── output
#>         └── programs

# setup environment based on config
rprofile(config::get(file = file.path(tmpdir, "hierarchy.yml")))
#> Attaching paths to envsetup:paths

# place data in prod data folder
saveRDS(mtcars, file.path(tmpdir, "demo/PROD/project1/data/mtcars.rds"))

# find the location of mtcars.rds
read_path(data, "mtcars.rds")
#> Read Path:/tmp/RtmpKPwpGu/demo/PROD/project1/data/mtcars.rds
#> [1] "/tmp/RtmpKPwpGu/demo/PROD/project1/data/mtcars.rds"