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diff --git a/lib/majic/extension.ex b/lib/majic/extension.ex
index 07cfc20..3bbdeba 100644
--- a/lib/majic/extension.ex
+++ b/lib/majic/extension.ex
@@ -1,112 +1,112 @@
defmodule Majic.Extension do
@moduledoc """
Helper module to fix extensions. Uses [MIME](https://hexdocs.pm/mime/MIME.html).
"""
@typedoc """
If an extension is defined for a given MIME type, append it to the previous extension.
If no extension could be found for the MIME type, and `subtype_as_extension: false`, the returned filename will have no extension.
"""
@type option_append :: {:append, false | true}
@typedoc "If no extension is defined for a given MIME type, use the subtype as its extension."
@type option_subtype_as_extension :: {:subtype_as_extension, false | true}
@spec fix(Path.t(), Majic.Result.t() | String.t(), [
option_append() | option_subtype_as_extension()
]) :: Path.t()
@doc """
Fix `name`'s extension according to `result_or_mime_type`.
```elixir
iex(1)> {:ok, result} = Majic.perform("cat.jpeg", once: true)
{:ok, %Majic.Result{mime_type: "image/webp", ...}}
iex(1)> Majic.Extension.fix("cat.jpeg", result)
"cat.webp"
```
The `append: true` option will append the correct extension to the user-provided one, if there's an extension for the
type:
```
iex(1)> Majic.Extension.fix("cat.jpeg", result, append: true)
"cat.jpeg.webp"
iex(2)> Majic.Extension.fix("Makefile.txt", "text/x-makefile", append: true)
"Makefile"
```
The `subtype_as_extension: true` option will use the subtype part of the MIME type as an extension for the ones that
don't have any:
```elixir
iex(1)> Majic.Extension.fix("Makefile.txt", "text/x-makefile", subtype_as_extension: true)
"Makefile.x-makefile"
iex(1)> Majic.Extension.fix("Makefile.txt", "text/x-makefile", subtype_as_extension: true, append: true)
"Makefile.txt.x-makefile"
```
"""
def fix(name, result_or_mime_type, options \\ [])
def fix(name, %Majic.Result{mime_type: mime_type}, options) do
do_fix(name, mime_type, options)
end
def fix(name, mime_type, options) do
do_fix(name, mime_type, options)
end
defp do_fix(name, mime_type, options) do
append? = Keyword.get(options, :append, false)
subtype? = Keyword.get(options, :subtype_as_extension, false)
ext_candidates = MIME.extensions(mime_type)
old_ext = String.downcase(Path.extname(name))
old_ext_bare = String.trim_leading(old_ext, ".")
basename = Path.basename(name, old_ext)
cond do
# extension already in candidate list, so no-op
old_ext_bare in ext_candidates ->
name
# has extension, append the subtype
not match?("", old_ext) && append? && subtype? ->
Enum.join([name, subtype_extension(subtype?, mime_type)], ".")
# has extension, change to subtype
not match?("", old_ext) && subtype? ->
Enum.join([basename, subtype_extension(subtype?, mime_type)], ".")
- # no extension, append
+ # no extension, append
match?("", old_ext) && append? ->
Enum.join([basename, List.first(ext_candidates)], ".")
# no candidates, so strip extension
match?([], ext_candidates) ->
basename
# no extension but no appending, so no-op
match?("", old_ext) ->
name
# append first candidate
not Enum.empty?(ext_candidates) && append? ->
Enum.join([name, List.first(ext_candidates)], ".")
# change extension to first candidate
not Enum.empty?(ext_candidates) ->
Enum.join([basename, List.first(ext_candidates)], ".")
# do nothing
true ->
name
end
end
defp subtype_extension(true, type) do
[_type, sub] = String.split(type, "/", parts: 2)
[sub]
end
defp subtype_extension(_, _), do: []
end

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