Reorganize source files and generalize presets

util.R

@@ -1,29 +0,0 @@
-library(rlog)
-
-#' Run a function caching the result on the file system.
-#'
-#' The function will be called with the appended arguments. The [`id`] argument
-#' will be used to identify the cache file on the file system and in log
-#' messages.
-run_cached <- function(id, func, ...) {
-    if (!dir.exists("cache")) {
-        dir.create("cache")
-    }
-
-    cache_file <- paste("cache/", id, ".rds", sep = "")
-
-    if (file.exists(cache_file)) {
-        log_info(sprintf("Loading %s from cache", id))
-
-        # If the cache file exists, we restore the data from it.
-        readRDS(cache_file)
-    } else {
-        # If the cache file doesn't exist, we have to do the computation.
-        data <- func(...)
-
-        # The results are cached for the next run.
-        saveRDS(data, cache_file)
-
-        data
-    }
-}