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use XDG_DATA_DIRS to locate mime database #163

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I ran into issue #160. Not all operating systems are using /usr or /opt and XDG_DATA_DIRS was made to avoid hard-coding paths like /usr and /opt. This PR makes use of XDG_DATA_DIRS while still maintaining compatibility with systems that do not have XDG_DATA_DIRS.

On my system XDG_DATA_DIRS looks like:

$ echo $XDG_DATA_DIRS
/nix/store/mcxhdbhz0wqi3icx6lvc33iaggd02v6v-patchelf-0.12/share:/nix/store/wrkla3l0c3hg9m9bp5mvjj7z4xqv54wz-terminator-2.1.1/share:/nix/store/2bqip8j6v2hxpafpsaahfdq851i01nan-gsettings-desktop-schemas-40.0/share/gsettings-schemas/gsettings-desktop-schemas-40.0:/nix/store/fdjrhdgvhic14jg6llvm6vz2jvgnhfl6-gtk+3-3.24.27/share/gsettings-schemas/gtk+3-3.24.27:/nix/store/k75hslc3jrcb8y5rd92saxbxxkg2hb03-desktops/share:/home/bob.vanderlinden/.nix-profile/share:/etc/profiles/per-user/bob.vanderlinden/share:/nix/var/nix/profiles/default/share:/run/current-system/sw/share

Fixes #160
Possible replacement for #125

@bobvanderlinden
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@jellybob could you have a look?

@bobvanderlinden
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@janko @minad could you have a look? Not sure if you're also maintainers of the project?

@@ -3,7 +3,15 @@ require "rake/clean"

def locate_mime_database
possible_paths = [
(File.expand_path(ENV["FREEDESKTOP_MIME_TYPES_PATH"]) if ENV["FREEDESKTOP_MIME_TYPES_PATH"]),
(File.expand_path(ENV["FREEDESKTOP_MIME_TYPES_PATH"]) if ENV["FREEDESKTOP_MIME_TYPES_PATH"])
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@giulliano-bueno giulliano-bueno Jan 10, 2022

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[suggestion]
Should you consider creating a small method called listPossiblePaths and avoid having these hard-to-read (IMHO) lines?

For example:

def listPossibleMimePaths
  paths = []
  paths = File.expand_path(ENV["FREEDESKTOP_MIME_TYPES_PATH"] if ENV["FREEDESKTOP_MIME_TYPES_PATH"]
...

paths
end

(File.expand_path(ENV["FREEDESKTOP_MIME_TYPES_PATH"]) if ENV["FREEDESKTOP_MIME_TYPES_PATH"]),
(File.expand_path(ENV["FREEDESKTOP_MIME_TYPES_PATH"]) if ENV["FREEDESKTOP_MIME_TYPES_PATH"])
] + (
if ENV["XDG_DATA_DIRS"]
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@giulliano-bueno giulliano-bueno Jan 10, 2022

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[suggestion]
If you use ENV.fetch with [] as default you can avoid one extra if statement. Check it here.

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Great work! I left some small comments that would make your code a bit easier to read.

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Use $XDG_DATA_DIRS to find the freedesktop.org.xml
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