find_module: Find a Module.

In openscienceunil/modulr: A Dependency Injection Framework for R

Description

Find a module, in the context of a module scope, if any.

Usage

find_module(name, scope_name = NULL, absolute = TRUE, extensions = c(".R",
  ".r", ".Rmd", ".rmd", ".Rnw", ".rnw"))

Arguments

name	A string (character vector of lenght one). A module name can contain letters, figures and some special characters, namely _, -, and /. The latter is a namespace separator. Names containing /mock/, /mocks/, /test/, /tests/, /example/, or /examples/ have a special meaning related to code testing and examples. The name "modulr" corresponds to a special module and is therefore reserved.
scope_name	A module name to use as scope (see define, maps_config, and examples).
absolute	A flag. Should the returned path be absolute? (see define, root_config, and examples)
extensions	A character vector. File extensions to consider.

Value

A list containing informations relative to the module: name, version, in-memory or on-disk storage, and file path (absolute or relative).

See Also

define, find_path, maps_config, reset, and root_config,

Examples

reset()
define("foo", NULL, function() "Hello World!")
find_module("foo")

reset()
tmp_dir <- tempfile("modulr_")
dir.create(tmp_dir)
tmp_file <- file.path(tmp_dir, "foo.R")
cat('define("foo", NULL, function() "Hello World!")', file = tmp_file)
root_config$set(tmp_dir)
set_verbosity(1L)
find_module("foo")
unlink(tmp_dir, recursive = TRUE)

reset()
tmp_dir <- tempfile("modulr_")
dir.create(file.path(tmp_dir, 'foo'), recursive = TRUE)
dir.create(file.path(tmp_dir, 'vendor'), recursive = TRUE)
cat(paste0('define("bar", list(great_module = "vendor/great_module"), ',
           'function() great_module)'),
    file = file.path(tmp_dir, "foo", "bar.R"))
cat('define("great_module", NULL, function() "Great Module")',
    file = file.path(tmp_dir, "vendor", "great_module.R"))
cat('define("great_module", NULL, function() "Old Great Module")',
    file = file.path(tmp_dir, "vendor", "old_great_module.R"))
root_config$set(tmp_dir)
set_verbosity(1L)
find_module("vendor/great_module")
maps_config$set("foo/bar" = list("vendor/great_module" =
                                 "vendor/old_great_module"))
find_module("vendor/great_module", "foo/bar")
unlink(tmp_dir, recursive = TRUE)

openscienceunil/modulr documentation built on May 3, 2019, 5:49 p.m.