Add locale-key-propagater and auto linter hooks

scripts/git/pre-commit

@@ -0,0 +1,23 @@
+# Useful precomit hooks
+# Please see https://git-scm.com/book/en/v2/Customizing-Git-Git-Hooks for instructions on installation.
+
+# Crystal linter
+# This is a modified version of the pre-commit hook from the crystal repo. https://github.com/crystal-lang/crystal/blob/master/scripts/git/pre-commit
+# Please refer to that if you'd like an version that doesn't automatically format staged files. 
+changed_cr_files=$(git diff --cached --name-only --diff-filter=ACM | grep '\.cr$')
+if [ ! -z "$changed_cr_files" ]; then
+  if [ -x bin/crystal ]; then
+    # use bin/crystal wrapper when available to run local compiler build
+    bin/crystal tool format $changed_cr_files >&2
+  else
+    crystal tool format $changed_cr_files >&2
+  fi
+
+  git add $changed_cr_files
+fi
+
+# Locale equalizer 
+if [ ! -z $(git diff --name-only --cached -- locales/) ]; then
+  crystal run scripts/propagate-new-locale-keys.cr
+  git add locales > /dev/null
+fi

scripts/propagate-new-locale-keys.cr

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+require "json"
+require "../src/invidious/helpers/i18n.cr"
+
+def locale_to_array(locale_name)
+  arrayifed_locale_data = [] of Tuple(String, JSON::Any | String)
+  keys_only_array = [] of String
+  LOCALES[locale_name].each do |k, v|
+    if v.as_h?
+      arrayifed_locale_data << {k, JSON.parse(v.as_h.to_json)}
+    elsif v.as_s?
+      arrayifed_locale_data << {k, v.as_s}
+    end
+
+    keys_only_array << k
+  end
+
+  return arrayifed_locale_data, keys_only_array
+end
+
+# Invidious currently had some unloaded localization files. We shouldn't need to propagate new keys onto those.
+# We'll also remove the reference locale (english) from the list to process.
+loaded_locales = LOCALES.keys.select! { |key| key != "en-US" }
+english_locale = locale_to_array("en-US")[0]
+
+# In order to automatically propagate locale keys we're going to be needing two arrays.
+# One is an array containing each locale data encoded as tuples. The other would contain
+# sets of only the keys of each locale files.
+#
+# The second file is to make sure that an key from the english reference file is present
+# in whatever the current locale we're scanning is.
+locale_list = [] of Array(Tuple(String, JSON::Any | String))
+locale_list_with_only_keys = [] of Array(String)
+
+# Populates the created arrays from above
+loaded_locales.each do |name|
+  arrayifed_locale_data, keys_only_locale = locale_to_array(name)
+
+  locale_list << arrayifed_locale_data
+  locale_list_with_only_keys << keys_only_locale
+end
+
+locale_list_with_only_keys.each_with_index do |keys_of_locale_in_processing, index_of_locale_in_processing|
+  insert_at = {} of Int32 => Tuple(String, JSON::Any | String)
+
+  LOCALES["en-US"].each_with_index do |ref_locale_data, ref_locale_key_index|
+    ref_locale_key, ref_locale_value = ref_locale_data
+
+    # Found an new key that isn't present in the current locale being processed.
+    if !keys_of_locale_in_processing.includes? ref_locale_key
+      # In terms of structure there's currently only two types; one for plural and the other for singular translations.
+      if ref_locale_value.as_h?
+        insert_at[ref_locale_key_index] = {ref_locale_key, JSON.parse({"([^.,0-9]|^)1([^.,0-9]|$)" => "", "" => ""}.to_json)}
+      else
+        insert_at[ref_locale_key_index] = {ref_locale_key, ""}
+      end
+    end
+  end
+
+  insert_at.each do |location_to_insert, data|
+    locale_list[index_of_locale_in_processing].insert(location_to_insert, data)
+  end
+end
+
+final_locale_list = [] of String
+# Now we convert back to how original formats
+locale_list.each do |locale|
+  intermediate_hash = {} of String => (JSON::Any | String)
+  locale.each { |k, v| intermediate_hash[k] = v }
+  final_locale_list << intermediate_hash.to_pretty_json(indent = "    ")
+end
+
+# Map locale name to locale contents
+locale_map = Hash.zip(loaded_locales, final_locale_list)
+
+locale_map.each do |locale_name, locale_contents|
+  File.write("locales/#{locale_name}.json", "#{locale_contents}\n")
+end