Read the user's preferred language from the OS (#382)

app/MindWork AI Studio/Layout/MainLayout.razor.cs

@@ -79,6 +79,12 @@ public partial class MainLayout : LayoutComponentBase, IMessageBusReceiver, IDis
         SettingsManager.DataDirectory = dataDir;
         Directory.CreateDirectory(SettingsManager.DataDirectory);
         
+        //
+        // Read the user language from Rust:
+        //
+        var userLanguage = await this.RustService.ReadUserLanguage();
+        this.Logger.LogInformation($"The user language is: '{userLanguage}'");
+        
         // Ensure that all settings are loaded:
         await this.SettingsManager.LoadSettings();
         

app/MindWork AI Studio/Pages/About.razor

@@ -113,6 +113,7 @@
                     <ThirdPartyComponent Name="file-format" Developer="Mickaël Malécot & Open Source Community" LicenseName="MIT" LicenseUrl="https://github.com/mmalecot/file-format/blob/main/LICENSE-MIT" RepositoryUrl="https://github.com/mmalecot/file-format" UseCase="This library is used to determine the file type of a file. This is necessary, e.g., when we want to stream a file."/>
                     <ThirdPartyComponent Name="calamine" Developer="Johann Tuffe, Joel Natividad, Eric Jolibois, Dmitriy & Open Source Community" LicenseName="MIT" LicenseUrl="https://github.com/tafia/calamine/blob/master/LICENSE-MIT.md" RepositoryUrl="https://github.com/tafia/calamine" UseCase="This library is used to read Excel and OpenDocument spreadsheet files. This is necessary, e.g., for using spreadsheets as a data source for a chat."/>
                     <ThirdPartyComponent Name="pdfium-render" Developer="Alastair Carey, Dorian Rudolph & Open Source Community" LicenseName="MIT" LicenseUrl="https://github.com/ajrcarey/pdfium-render/blob/master/LICENSE.md" RepositoryUrl="https://github.com/ajrcarey/pdfium-render" UseCase="This library is used to read PDF files. This is necessary, e.g., for using PDFs as a data source for a chat."/>
+                    <ThirdPartyComponent Name="sys-locale" Developer="1Password Team, ComplexSpaces & Open Source Community" LicenseName="MIT" LicenseUrl="https://github.com/1Password/sys-locale/blob/main/LICENSE-MIT" RepositoryUrl="https://github.com/1Password/sys-locale" UseCase="This library is used to determine the language of the operating system. This is necessary to set the language of the user interface."/>
                     <ThirdPartyComponent Name="Lua-CSharp" Developer="Yusuke Nakada & Open Source Community" LicenseName="MIT" LicenseUrl="https://github.com/nuskey8/Lua-CSharp/blob/main/LICENSE" RepositoryUrl="https://github.com/nuskey8/Lua-CSharp" UseCase="We use Lua as the language for plugins. Lua-CSharp lets Lua scripts communicate with AI Studio and vice versa. Thank you, Yusuke Nakada, for this great library." />
                     <ThirdPartyComponent Name="HtmlAgilityPack" Developer="ZZZ Projects & Open Source Community" LicenseName="MIT" LicenseUrl="https://github.com/zzzprojects/html-agility-pack/blob/master/LICENSE" RepositoryUrl="https://github.com/zzzprojects/html-agility-pack" UseCase="We use the HtmlAgilityPack to extract content from the web. This is necessary, e.g., when you provide a URL as input for an assistant."/>
                     <ThirdPartyComponent Name="ReverseMarkdown" Developer="Babu Annamalai & Open Source Community" LicenseName="MIT" LicenseUrl="https://github.com/mysticmind/reversemarkdown-net/blob/master/LICENSE" RepositoryUrl="https://github.com/mysticmind/reversemarkdown-net" UseCase="This library is used to convert HTML to Markdown. This is necessary, e.g., when you provide a URL as input for an assistant."/>

app/MindWork AI Studio/Plugins/languages/de-de-43065dbc-78d0-45b7-92be-f14c2926e2dc/plugin.lua

@@ -40,6 +40,10 @@ IS_MAINTAINED = true
 -- When the plugin is deprecated, this message will be shown to users:
 DEPRECATION_MESSAGE = ""
 
+-- The IETF BCP 47 tag for the language. It's the ISO 639 language
+-- code followed by the ISO 3166-1 country code:
+IETF_TAG = "de-DE"
+
 UI_TEXT_CONTENT = {
     HOME = CONTENT_HOME,
 }

app/MindWork AI Studio/Plugins/languages/en-us-97dfb1ba-50c4-4440-8dfa-6575daf543c8/plugin.lua

@@ -40,6 +40,10 @@ IS_MAINTAINED = true
 -- When the plugin is deprecated, this message will be shown to users:
 DEPRECATION_MESSAGE = ""
 
+-- The IETF BCP 47 tag for the language. It's the ISO 639 language
+-- code followed by the ISO 3166-1 country code:
+IETF_TAG = "en-US"
+
 UI_TEXT_CONTENT = {
     HOME = CONTENT_HOME,
 }

app/MindWork AI Studio/Tools/PluginSystem/PluginLanguage.cs

@@ -6,12 +6,16 @@ public sealed class PluginLanguage : PluginBase, ILanguagePlugin
 {
     private readonly Dictionary<string, string> content = [];
     private readonly List<ILanguagePlugin> otherLanguagePlugins = [];
+    private readonly string langCultureTag;
     
     private ILanguagePlugin? baseLanguage;
     
     public PluginLanguage(bool isInternal, LuaState state, PluginType type) : base(isInternal, state, type)
     {
-        if (this.TryInitUITextContent(out var issue, out var readContent))
+        if(!this.TryInitIETFTag(out var issue, out this.langCultureTag))
+            this.pluginIssues.Add(issue);
+        
+        if (this.TryInitUITextContent(out issue, out var readContent))
             this.content = readContent;
         else
             this.pluginIssues.Add(issue);
@@ -65,4 +69,62 @@ public sealed class PluginLanguage : PluginBase, ILanguagePlugin
         value = string.Empty;
         return false;
     }
+    
+    /// <summary>
+    /// Tries to initialize the IETF tag.
+    /// </summary>
+    /// <param name="message">The error message, when the IETF tag could not be read.</param>
+    /// <param name="readLangCultureTag">The read IETF tag.</param>
+    /// <returns>True, when the IETF tag could be read, false otherwise.</returns>
+    private bool TryInitIETFTag(out string message, out string readLangCultureTag)
+    {
+        if (!this.state.Environment["IETF_TAG"].TryRead(out readLangCultureTag))
+        {
+            message = "The field IETF_TAG does not exist or is not a valid string.";
+            readLangCultureTag = string.Empty;
+            return false;
+        }
+        
+        if (string.IsNullOrWhiteSpace(readLangCultureTag))
+        {
+            message = "The field IETF_TAG is empty. Use a valid IETF tag like 'en-US'. The first part is the language, the second part is the country code.";
+            readLangCultureTag = string.Empty;
+            return false;
+        }
+        
+        if (readLangCultureTag.Length != 5)
+        {
+            message = "The field IETF_TAG is not a valid IETF tag. Use a valid IETF tag like 'en-US'. The first part is the language, the second part is the country code.";
+            readLangCultureTag = string.Empty;
+            return false;
+        }
+        
+        if (readLangCultureTag[2] != '-')
+        {
+            message = "The field IETF_TAG is not a valid IETF tag. Use a valid IETF tag like 'en-US'. The first part is the language, the second part is the country code.";
+            readLangCultureTag = string.Empty;
+            return false;
+        }
+        
+        // Check the first part consists of only lower case letters:
+        for (var i = 0; i < 2; i++)
+            if (!char.IsLower(readLangCultureTag[i]))
+            {
+                message = "The field IETF_TAG is not a valid IETF tag. Use a valid IETF tag like 'en-US'. The first part is the language, the second part is the country code.";
+                readLangCultureTag = string.Empty;
+                return false;
+            }
+        
+        // Check the second part consists of only upper case letters:
+        for (var i = 3; i < 5; i++)
+            if (!char.IsUpper(readLangCultureTag[i]))
+            {
+                message = "The field IETF_TAG is not a valid IETF tag. Use a valid IETF tag like 'en-US'. The first part is the language, the second part is the country code.";
+                readLangCultureTag = string.Empty;
+                return false;
+            }
+        
+        message = string.Empty;
+        return true;
+    }
 }

app/MindWork AI Studio/Tools/Services/RustService.OS.cs

@@ -0,0 +1,16 @@
+namespace AIStudio.Tools.Services;
+
+public sealed partial class RustService
+{
+    public async Task<string> ReadUserLanguage()
+    {
+        var response = await this.http.GetAsync("/system/language");
+        if (!response.IsSuccessStatusCode)
+        {
+            this.logger!.LogError($"Failed to read the user language from Rust: '{response.StatusCode}'");
+            return string.Empty;
+        }
+        
+        return await response.Content.ReadAsStringAsync();
+    }
+}