LibLine: Read configuration from a config file

Libraries/LibLine/Editor.cpp

@@ -29,6 +29,7 @@
 #include <AK/StringBuilder.h>
 #include <AK/Utf32View.h>
 #include <AK/Utf8View.h>
+#include <LibCore/ConfigFile.h>
 #include <LibCore/Event.h>
 #include <LibCore/EventLoop.h>
 #include <LibCore/Notifier.h>
@@ -47,6 +48,32 @@ constexpr u32 ctrl(char c) { return c & 0x3f; }
 
 namespace Line {
 
+Configuration Configuration::from_config(const StringView& libname)
+{
+    Configuration configuration;
+    auto config_file = Core::ConfigFile::get_for_lib(libname);
+
+    // Read behaviour options.
+    auto refresh = config_file->read_entry("behaviour", "refresh", "lazy");
+    auto operation = config_file->read_entry("behaviour", "operation_mode");
+
+    if (refresh.equals_ignoring_case("lazy"))
+        configuration.set(Configuration::Lazy);
+    else if (refresh.equals_ignoring_case("eager"))
+        configuration.set(Configuration::Eager);
+
+    if (operation.equals_ignoring_case("full"))
+        configuration.set(Configuration::OperationMode::Full);
+    else if (operation.equals_ignoring_case("noescapesequences"))
+        configuration.set(Configuration::OperationMode::NoEscapeSequences);
+    else if (operation.equals_ignoring_case("noninteractive"))
+        configuration.set(Configuration::OperationMode::NonInteractive);
+    else
+        configuration.set(Configuration::OperationMode::Unset);
+
+    return configuration;
+}
+
 Editor::Editor(Configuration configuration)
     : m_configuration(move(configuration))
 {

Libraries/LibLine/Editor.h

@@ -78,6 +78,8 @@ struct Configuration {
     void set(RefreshBehaviour refresh) { refresh_behaviour = refresh; }
     void set(OperationMode mode) { operation_mode = mode; }
 
+    static Configuration from_config(const StringView& libname = "line");
+
     RefreshBehaviour refresh_behaviour { RefreshBehaviour::Lazy };
     OperationMode operation_mode { OperationMode::Unset };
 };
@@ -178,7 +180,7 @@ public:
     const Utf32View buffer_view() const { return { m_buffer.data(), m_buffer.size() }; }
 
 private:
-    explicit Editor(Configuration configuration = {});
+    explicit Editor(Configuration configuration = Configuration::from_config());
 
     enum VTState {
         Free = 1,
@@ -365,8 +367,10 @@ private:
     HashMap<char, NonnullOwnPtr<KeyCallback>> m_key_callbacks;
 
     // TODO: handle signals internally.
-    struct termios m_termios {};
-    struct termios m_default_termios {};
+    struct termios m_termios {
+    };
+    struct termios m_default_termios {
+    };
     bool m_was_interrupted { false };
     bool m_was_resized { false };
 

Shell/main.cpp

@@ -176,7 +176,7 @@ int main(int argc, char** argv)
     }
 #endif
 
-    editor = Line::Editor::construct(Line::Configuration {});
+    editor = Line::Editor::construct();
 
     auto shell = Shell::construct();
     s_shell = shell.ptr();