Add android_prune_orphaned_translations action

CHANGELOG.md

@@ -10,7 +10,7 @@ _None_
 
 ### New Features
 
-_None_
+- Added `android_prune_orphaned_translations` action: removes `<string>`, `<string-array>` and `<plurals>` entries from `values-*/strings.xml` whose key is not declared in the source strings (the res dir's default `values/strings.xml`, optionally unioned with `additional_source_strings_paths`). Useful after downloading translations from GlotPress to avoid Lint `ExtraTranslation` errors from keys removed/renamed since the source was last synced.
 
 ### Bug Fixes
 

lib/fastlane/plugin/wpmreleasetoolkit/actions/android/android_prune_orphaned_translations_action.rb

@@ -0,0 +1,116 @@
+# frozen_string_literal: true
+
+require 'fastlane/action'
+require 'nokogiri'
+
+module Fastlane
+  module Actions
+    class AndroidPruneOrphanedTranslationsAction < Action
+      def self.run(params)
+        res_dir = params[:res_dir]
+        source_paths = [File.join(res_dir, 'values', 'strings.xml')] + params[:additional_source_strings_paths]
+        valid_keys = collect_keys(source_paths)
+
+        locale_files = Dir.glob(File.join(res_dir, 'values-*', 'strings.xml'))
+        total_pruned = 0
+
+        locale_files.each do |file|
+          pruned = prune_file(file: file, valid_keys: valid_keys)
+          next if pruned.empty?
+
+          total_pruned += pruned.count
+          UI.message("Pruned #{pruned.count} orphaned entries from `#{file}`: #{pruned.join(', ')}")
+        end
+
+        UI.success("Pruned #{total_pruned} orphaned translation entries across #{locale_files.count} locale file(s).")
+        total_pruned
+      end
+
+      # Collects the set of resource names (string, string-array, plurals, …) declared in the given strings files.
+      #
+      # @param [Array<String>] paths The strings.xml files to read the valid keys from.
+      # @return [Set<String>] The set of declared resource names.
+      def self.collect_keys(paths)
+        paths.each_with_object(Set.new) do |path, keys|
+          doc = File.open(path) { |f| Nokogiri::XML(f, nil, Encoding::UTF_8.to_s) }
+          doc.xpath('/resources/*[@name]').each { |node| keys << node['name'] }
+        end
+      end
+
+      # Removes from `file` any resource entry whose `name` is not in `valid_keys`, preserving the rest of the
+      # file's formatting (so the change shows up as a minimal diff).
+      #
+      # @param [String] file The locale strings.xml file to prune.
+      # @param [Set<String>] valid_keys The set of names that are allowed to remain.
+      # @return [Array<String>] The names of the entries that were pruned.
+      def self.prune_file(file:, valid_keys:)
+        doc = File.open(file) { |f| Nokogiri::XML(f, nil, Encoding::UTF_8.to_s) }
+        orphans = doc.xpath('/resources/*[@name]').reject { |node| valid_keys.include?(node['name']) }
+        return [] if orphans.empty?
+
+        names = orphans.map { |node| node['name'] }
+        orphans.each do |node|
+          # Drop the indentation/newline text node right before the element too, to avoid leaving a blank line.
+          previous = node.previous_sibling
+          previous.remove if previous&.text? && previous.text.strip.empty?
+          node.remove
+        end
+
+        File.open(file, 'w') { |f| doc.write_to(f, encoding: Encoding::UTF_8.to_s, indent: 4) }
+        names
+      end
+
+      #####################################################
+      # @!group Documentation
+      #####################################################
+
+      def self.description
+        'Removes translations whose key is not present in the source strings, to avoid Lint `ExtraTranslation` errors'
+      end
+
+      def self.details
+        <<~DETAILS
+          When downloading translations from GlotPress, the export may include keys that are no longer present in
+          the app's source strings (e.g. removed or renamed since the GlotPress source was last synced). Android
+          Lint flags these orphaned translations as `ExtraTranslation` errors.
+
+          This action removes — from every `values-*/strings.xml` under `res_dir` — any `<string>`, `<string-array>`
+          or `<plurals>` entry whose `name` is not declared in the default `values/strings.xml` of `res_dir`,
+          optionally unioned with `additional_source_strings_paths` (useful when a product flavor overlays a base
+          module's resources at build time, so the base module's keys are valid too).
+        DETAILS
+      end
+
+      def self.available_options
+        [
+          FastlaneCore::ConfigItem.new(
+            key: :res_dir,
+            description: "Path to the Android project's `res` directory containing the `values-*` locale subdirectories to prune",
+            type: String,
+            optional: false
+          ),
+          FastlaneCore::ConfigItem.new(
+            key: :additional_source_strings_paths,
+            description: 'Paths to additional default `strings.xml` files whose keys should also be treated as valid ' \
+                         '(e.g. a base module that the pruned `res_dir` overlays at build time)',
+            type: Array,
+            optional: true,
+            default_value: []
+          ),
+        ]
+      end
+
+      def self.return_value
+        'The total number of orphaned translation entries that were pruned'
+      end
+
+      def self.authors
+        ['Automattic']
+      end
+
+      def self.is_supported?(platform)
+        platform == :android
+      end
+    end
+  end
+end

spec/android_prune_orphaned_translations_spec.rb

@@ -0,0 +1,110 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+require 'tmpdir'
+
+describe Fastlane::Actions::AndroidPruneOrphanedTranslationsAction do
+  # Writes `content` to `path`, creating intermediate directories.
+  def write_file(path, content)
+    FileUtils.mkdir_p(File.dirname(path))
+    File.write(path, content)
+  end
+
+  # A default `values/strings.xml` declaring `hello`, `bye`, an array and a plural.
+  let(:default_strings) do
+    <<~XML
+      <?xml version="1.0" encoding="UTF-8"?>
+      <resources>
+          <string name="hello">Hello</string>
+          <string name="bye">Bye</string>
+          <string-array name="planets">
+              <item>Earth</item>
+          </string-array>
+          <plurals name="items">
+              <item quantity="one">%d item</item>
+              <item quantity="other">%d items</item>
+          </plurals>
+      </resources>
+    XML
+  end
+
+  it 'removes only the entries whose key is not in the default strings, keeping the rest intact' do
+    Dir.mktmpdir do |dir|
+      res_dir = File.join(dir, 'res')
+      write_file(File.join(res_dir, 'values', 'strings.xml'), default_strings)
+      fr_file = File.join(res_dir, 'values-fr', 'strings.xml')
+      write_file(fr_file, <<~XML)
+        <?xml version="1.0" encoding="UTF-8"?>
+        <resources>
+            <string name="hello">Bonjour</string>
+            <string name="orphan_string">Orphelin</string>
+            <string name="bye">Au revoir</string>
+            <plurals name="orphan_plural">
+                <item quantity="one">%d truc</item>
+                <item quantity="other">%d trucs</item>
+            </plurals>
+        </resources>
+      XML
+
+      pruned = run_described_fastlane_action(res_dir: res_dir)
+
+      expect(pruned).to eq(2)
+      content = File.read(fr_file)
+      expect(content).to include('name="hello"', 'name="bye"')
+      expect(content).not_to include('orphan_string', 'orphan_plural')
+      # No blank line left behind where the orphaned <string> was removed.
+      expect(content).not_to match(/\n[[:space:]]*\n[[:space:]]*<string name="bye"/)
+    end
+  end
+
+  it 'treats keys from `additional_source_strings_paths` as valid (flavor overlay case)' do
+    Dir.mktmpdir do |dir|
+      res_dir = File.join(dir, 'res')
+      write_file(File.join(res_dir, 'values', 'strings.xml'), <<~XML)
+        <?xml version="1.0" encoding="UTF-8"?>
+        <resources>
+            <string name="flavor_only">Flavor</string>
+        </resources>
+      XML
+      base_strings = File.join(dir, 'base', 'values', 'strings.xml')
+      write_file(base_strings, default_strings)
+      fr_file = File.join(res_dir, 'values-fr', 'strings.xml')
+      write_file(fr_file, <<~XML)
+        <?xml version="1.0" encoding="UTF-8"?>
+        <resources>
+            <string name="flavor_only">Saveur</string>
+            <string name="hello">Bonjour</string>
+            <string name="orphan_string">Orphelin</string>
+        </resources>
+      XML
+
+      pruned = run_described_fastlane_action(res_dir: res_dir, additional_source_strings_paths: [base_strings])
+
+      expect(pruned).to eq(1)
+      content = File.read(fr_file)
+      expect(content).to include('name="flavor_only"', 'name="hello"')
+      expect(content).not_to include('orphan_string')
+    end
+  end
+
+  it 'does nothing and reports zero when there are no orphaned entries' do
+    Dir.mktmpdir do |dir|
+      res_dir = File.join(dir, 'res')
+      write_file(File.join(res_dir, 'values', 'strings.xml'), default_strings)
+      fr_file = File.join(res_dir, 'values-fr', 'strings.xml')
+      fr_content = <<~XML
+        <?xml version="1.0" encoding="UTF-8"?>
+        <resources>
+            <string name="hello">Bonjour</string>
+            <string name="bye">Au revoir</string>
+        </resources>
+      XML
+      write_file(fr_file, fr_content)
+
+      pruned = run_described_fastlane_action(res_dir: res_dir)
+
+      expect(pruned).to eq(0)
+      expect(File.read(fr_file)).to eq(fr_content)
+    end
+  end
+end