Added automatic installation of rust-analyzer through rustup if component is found

src/notebook.cpp

@@ -6,6 +6,7 @@
 #include "source_clang.hpp"
 #include "source_generic.hpp"
 #include "source_language_protocol.hpp"
+#include "utility.hpp"
 #include <fstream>
 #include <gtksourceview-3.0/gtksourceview/gtksourcemap.h>
 #include <regex>
@@ -183,6 +184,41 @@ bool Notebook::open(const boost::filesystem::path &file_path_, Position position
         boost::system::error_code ec;
         if(boost::filesystem::exists(rust_analyzer, ec))
           source_views.emplace_back(new Source::LanguageProtocolView(file_path, language, language_protocol_language_id, rust_analyzer.string()));
+        else {
+          static bool first = true;
+          std::stringstream stdin_stream, stdout_stream;
+          if(first && !filesystem::find_executable("rustup").empty()) {
+            first = false;
+            if(Terminal::get().process(stdin_stream, stdout_stream, "rustup component list") == 0) {
+              std::string line;
+              while(std::getline(stdout_stream, line)) {
+                if(starts_with(line, "rust-analyzer")) {
+                  Gtk::MessageDialog dialog(*static_cast<Gtk::Window *>(get_toplevel()), "Install rust-analyzer (Rust language server)", false, Gtk::MESSAGE_QUESTION, Gtk::BUTTONS_YES_NO);
+                  dialog.set_default_response(Gtk::RESPONSE_YES);
+                  dialog.set_secondary_text("Would you like to install rust-analyzer through rustup?");
+                  int result = dialog.run();
+                  if(result == Gtk::RESPONSE_YES) {
+                    boost::optional<int> exit_status;
+                    Terminal::get().async_process(std::string("rustup component add rust-src ") + (starts_with(line, "rust-analyzer-preview") ? "rust-analyzer-preview" : "rust-analyzer"), "", [&exit_status](int exit_status_) {
+                      exit_status = exit_status_;
+                    });
+                    while(!exit_status) {
+                      while(Gtk::Main::events_pending())
+                        Gtk::Main::iteration();
+                      std::this_thread::sleep_for(std::chrono::milliseconds(10));
+                    }
+                    if(exit_status == 0) {
+                      Terminal::get().print("\e[32mSuccessfully\e[m installed rust-analyzer.\n");
+                      if(boost::filesystem::exists(rust_analyzer, ec))
+                        source_views.emplace_back(new Source::LanguageProtocolView(file_path, language, language_protocol_language_id, rust_analyzer.string()));
+                    }
+                  }
+                  break;
+                }
+              }
+            }
+          }
+        }
       }
     }
   }