Add readline support to REPL

This has per-session history support, searching with ^R, and
modifications with chords like ^W. History is not yet persistent to
disk. It also doesn't yet support multi-line inputs.

CMakeLists.txt

@@ -210,7 +210,6 @@ find_package(CLI11 CONFIG REQUIRED)
 
 target_include_directories(jank_lib SYSTEM PRIVATE ${Boost_INCLUDE_DIRS})
 target_include_directories(jank_lib SYSTEM PRIVATE ${CLING_INCLUDE_DIRS})
-target_include_directories(jank_lib SYSTEM PRIVATE /home/jeaye/projects/jank/build/cling/lib)
 target_include_directories(jank_lib SYSTEM PRIVATE ${CLANG_INCLUDE_DIRS})
 target_include_directories(jank_lib SYSTEM PRIVATE ${LLVM_INCLUDE_DIRS})
 
@@ -222,6 +221,7 @@ target_link_libraries(
   BDWgc::gc BDWgc::cord BDWgc::gccpp BDWgc::gctba
   libzippp::libzippp
   CLI11::CLI11
+  readline
 )
 
 set_target_properties(jank_lib PROPERTIES LINK_FLAGS_RELEASE "-s")

src/cpp/jank/jit/processor.cpp

@@ -2,6 +2,8 @@
 
 #include <cling/Interpreter/Value.h>
 #include <clang/AST/Type.h>
+//#include <Interpreter/IncrementalExecutor.h>
+//#include <llvm/Support/MemoryBuffer.h>
 
 #include <jank/util/process_location.hpp>
 #include <jank/util/make_array.hpp>

src/cpp/main.cpp

@@ -2,6 +2,7 @@
 #include <filesystem>
 
 #include <boost/filesystem.hpp>
+#include <boost/algorithm/string.hpp>
 
 #include <cling/Interpreter/Interpreter.h>
 #include <cling/Interpreter/Value.h>
@@ -10,7 +11,8 @@
 
 #include <CLI/CLI.hpp>
 
-#include <jank/runtime/detail/object_util.hpp>
+#include <readline/readline.h>
+#include <readline/history.h>
 
 #include <jank/util/mapped_file.hpp>
 #include <jank/read/lex.hpp>
@@ -74,13 +76,22 @@ namespace jank
       rt_ctx.load_module("clojure.core").expect_ok();
     }
 
-    /* TODO: Readline with history. */
+    /* By default, RL will do tab completion for files. We disable that here. */
+    rl_bind_key('\t', rl_insert);
+
     /* TODO: Completion. */
     /* TODO: Syntax highlighting. */
-    std::string line;
-    std::cout << "> " << std::flush;
-    while(std::getline(std::cin, line))
+    /* TODO: Multi-line input. */
+    while(auto const buf = readline("> "))
     {
+      native_string line{ buf };
+      boost::trim(line);
+      if(line.empty())
+      { continue; }
+
+      /* TODO: Persist history to disk, á la .lein-repl-history. */
+      /* History is persisted for this session only. */
+      add_history(line.data());
       try
       {
         auto const res(rt_ctx.eval_string(line));
@@ -95,8 +106,6 @@ namespace jank
       { fmt::println("Exception: {}", s); }
       catch(jank::read::error const &e)
       { fmt::println("Read error: {}", e.message); }
-
-      std::cout << "> " << std::flush;
     }
   }
 }

vcpkg.json

@@ -13,7 +13,8 @@
     "immer",
     "libguarded",
     "libzippp",
-    "magic-enum"
+    "magic-enum",
+    "readline"
   ],
   "default-features": [],
   "features": {