Make ` command behave like irb with coloring

- And `` command to run selected lines, but removing ``` as
  that can be done by making a new buffer and writing in that.

include/internal/scripting/ruby.h

@@ -120,5 +120,5 @@ struct Block {
 };
 
 void register_basic(BEd &ctx);
-void run(BEd &ctx, const std::string &str);
+std::string run(BEd &ctx, const std::string &str);
 }; // namespace bed::internal::scripting

samples/bed.rb

@@ -0,0 +1,3 @@
+register :happy, address: :none do
+  puts "be nice"
+end

src/internal/functions/extended.cc

@@ -176,8 +176,8 @@ void Function::register_extented(BEd &ctx) {
       .address_kind = Function::AddressKind::Range,
       .argument_kind = Function::ArgumentKind::Ruby,
       .input_mode = Function::InputMode::None,
-      .desc = "Execute some ruby code",
-      .default_address = "",
+      .desc = "Execute given ruby code.",
+      .default_address = "0,0",
       .accept_zero = true,
       .pre_text_mode = nullptr,
       .handle = [](
@@ -193,7 +193,30 @@ void Function::register_extented(BEd &ctx) {
                         + ";$END=" + std::to_string(addr.end)
                         + ";$BUFNAME=\"" + addr.buffername + "\"";
         scripting::run(ctx, pre_code);
-        scripting::run(ctx, arg.cmd);
+        auto line = scripting::run(ctx, arg.cmd);
+        ctx.io.write("=> ", 3);
+        auto parser = syntax::MiniParser(
+          *ctx.languages["ruby"],
+          vase::Shard::from_string(line.data(), line.size(), true),
+          nullptr
+        );
+        const auto &tokens = parser.lines[0].second;
+        uint32_t cursor = 0;
+        for (const auto &token : tokens) {
+          const uint32_t start = token.start;
+          const uint32_t end = token.end;
+          if (start > line.size() || end > line.size())
+            break;
+          if (cursor < start)
+            ctx.io.write(line.data() + cursor, start - cursor);
+          ctx.io.apply(token.type);
+          ctx.io.write(line.data() + start, end - start);
+          ctx.io.reset();
+          cursor = end;
+        }
+        if (cursor < line.size())
+          ctx.io.write(line.data() + cursor, line.size() - cursor);
+        ctx.io.write_line("");
       },
     }
   );
@@ -204,7 +227,7 @@ void Function::register_extented(BEd &ctx) {
       .argument_kind = Function::ArgumentKind::None,
       .input_mode = Function::InputMode::None,
       .desc = "Execute addressed lines as ruby code.",
-      .default_address = ".,.",
+      .default_address = "1,$",
       .accept_zero = false,
       .pre_text_mode = nullptr,
       .handle = [](
@@ -230,38 +253,6 @@ void Function::register_extented(BEd &ctx) {
       },
     }
   );
-  ctx.functions.insert(
-    "```",
-    Function{
-      .address_kind = Function::AddressKind::Range,
-      .argument_kind = Function::ArgumentKind::None,
-      .input_mode = Function::InputMode::Text,
-      .desc = "Execute some ruby code (taken from text mode)",
-      .default_address = "",
-      .accept_zero = true,
-      .pre_text_mode = [](
-                         BEd &ctx,
-                         const buffer::Address &,
-                         const Argument &
-                       ) -> std::tuple<vase::Shard *, syntax::Language *, void *> {
-        return {nullptr, ctx.languages["ruby"], nullptr};
-      },
-      .handle = [](
-                  BEd &ctx,
-                  const buffer::Address &addr_,
-                  vase::Shard *code,
-                  const Argument &,
-                  std::vector<buffer::Line> *
-                ) {
-        auto &addr = std::get<buffer::Range>(addr_);
-        auto pre_code = "$START=" + std::to_string(addr.start)
-                        + ";$END=" + std::to_string(addr.end)
-                        + ";$BUFNAME=\"" + addr.buffername + "\"";
-        scripting::run(ctx, pre_code);
-        scripting::run(ctx, vase::to_string(code));
-        vase::Shard::release(code); },
-    }
-  );
   ctx.functions.insert(
     "echo",
     Function{

src/internal/scripting/ruby.cc

@@ -115,11 +115,14 @@ void register_basic(BEd &ctx) {
   mrb_define_method(mrb, mrb->kernel_module, "unregister", mrb_bed_unregister, MRB_ARGS_REQ(1));
 }
 
-void run(BEd &ctx, const std::string &str) {
+std::string run(BEd &ctx, const std::string &str) {
   mrb_state *mrb = ctx.mrb.state;
-  mrb_load_nstring(mrb, str.data(), str.size());
-  if (!mrb->exc)
-    return;
+  mrb_value result = mrb_load_nstring(mrb, str.data(), str.size());
+  if (!mrb->exc) {
+    mrb_value inspected = mrb_funcall(mrb, result, "inspect", 0);
+    std::string output(RSTRING_PTR(inspected), RSTRING_LEN(inspected));
+    return output;
+  }
   mrb_value exc = mrb_obj_value(mrb->exc);
   mrb_value msg = mrb_funcall(mrb, exc, "message", 0);
   std::string error;