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Concise structure for chainable paths
# install.packages("devtools")
devtools::install_github("krzjoa/path.chain")If you are using RStudio, you know that among many excellent features of this IDE there is a path autocompletion.
However, you can also meet situations, when that may be not enough. Most
of all, I mean bigger projects, where you store a complex file structure
in the config file. You can handle such configuration YAML file
using the library named config.
You may encounter a situation, when you’ll want to save current
directory structure in this config.
library(magrittr)
library(path.chain)
# Create an example file stucture
tmp <- create_temp_dir("files")
create_sample_dir(tmp, override = TRUE)
#> [1] TRUE
# Sample structure we've already created looks as follows
fs::dir_tree(tmp)
#> /tmp/Rtmpr3ELI6/files
#> ├── data
#> │ ├── example1.RData
#> │ ├── example2.RData
#> │ └── persons.csv
#> └── docs
#> └── schema.txt
# Loading stucture
file.structure <- path_chain(tmp)
file.structure$data$example1.RData
#> [1] "files/data/example1.RData"
# Loading stucture with naming convention
file.structure <- path_chain(tmp, naming = naming_k)
file.structure$kData$kExample1
#> [1] "files/data/example1.RData"
# Saving file structure
file.structure %>%
as_config(root.name = "kRoot", wrap = "kDirs") %>% # Required by `{config}` package
yaml::write_yaml(temp_path("config.yaml"))default:
kDirs:
kRoot: files/
kData:
kRoot: data/
kExample1: kExample1
kExample2: kExample2
kPersons: kPersons
kDocs:
kRoot: docs/
kSchema: kSchemak.dirs <- config::get("kDirs", "default", temp_path("config.yaml")) %>%
as_path_chain()
class(k.dirs)
#> [1] "path_chain"
k.dirs$kData$.
#> [1] "files/data/"
k.dirs$kData$kExample1
#> [1] "files/data/example1.RData"on_path_not_exists(~ print("Path {.x} not exists"))
is_path_valid <- function(x) if (!grepl("\\.fst", x)) print("Invalid file")
on_validate_path(is_path_valid)
level2.b <- path_link("fileA.RData")
level2.a <- path_link("fileB.fst")
level1 <- path_link("data", list(level2.a = level2.a , level2.b = level2.b))
root <- path_link("files", list(level1))
root$data$level2.a
#> [1] "Path {.x} not exists"
#> [1] "files/data/fileB.fst"
root$data$level2.b
#> [1] "Path {.x} not exists"
#> [1] "Invalid file"
#> [1] "files/data/fileA.RData"
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