File Paths in Nim

Here’s the translation of the Go code to Nim, along with explanations in Markdown format suitable for Hugo:

The os module provides functions to work with file paths in a way that is portable between operating systems.

import os, strutils

proc main() =
  # joinPath should be used to construct paths in a
  # portable way. It takes any number of arguments
  # and constructs a hierarchical path from them.
  let p = joinPath("dir1", "dir2", "filename")
  echo "p: ", p

  # You should always use joinPath instead of
  # concatenating / or \ manually. In addition
  # to providing portability, joinPath will also
  # normalize paths by removing superfluous separators
  # and directory changes.
  echo joinPath("dir1//", "filename")
  echo joinPath("dir1/../dir1", "filename")

  # splitPath can be used to split a path to the
  # directory and the file.
  let (dir, name, _) = splitPath(p)
  echo "Dir(p): ", dir
  echo "Base(p): ", name

  # We can check whether a path is absolute.
  echo isAbsolute("dir/file")
  echo isAbsolute("/dir/file")

  let filename = "config.json"

  # Some file names have extensions following a dot. We
  # can split the extension out of such names with splitFile.
  let (_, _, ext) = splitFile(filename)
  echo ext

  # To find the file's name with the extension removed,
  # use stripExtension from the strutils module.
  echo stripExtension(filename)

  # relativePath finds a relative path between a base and a
  # target. It returns an empty string if the target cannot
  # be made relative to base.
  echo relativePath("a/b", "a/b/t/file")
  echo relativePath("a/b", "a/c/t/file")

main()

To run the program, save it as file_paths.nim and use the Nim compiler:

$ nim c -r file_paths.nim
p: dir1/dir2/filename
dir1/filename
dir1/filename
Dir(p): dir1/dir2
Base(p): filename
false
true
.json
config
t/file
../c/t/file

This example demonstrates how to work with file paths in Nim using the os module. It covers joining paths, splitting paths, checking for absolute paths, working with file extensions, and finding relative paths. The os module provides these functions to ensure portability across different operating systems.

Note that Nim’s approach to file path manipulation is similar to other languages, but it uses its own set of functions from the os module. The concepts remain the same, but the function names and exact usage might differ slightly from other languages.

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File Paths in Nim