From 10a7462e795bc88e409533fadeab012dd1859da2 Mon Sep 17 00:00:00 2001
From: Felix Morgner <felix.morgner@gmail.com>
Date: Thu, 22 Mar 2018 18:44:54 +0100
Subject: extsh: add linenoise input handling

---
 .gitmodules             |  3 +++
 CMakeLists.txt          |  5 ++++-
 external/CMakeLists.txt |  3 +++
 external/linenoise      |  1 +
 src/CMakeLists.txt      |  1 +
 src/extsh.cpp           | 22 +++++++++++++++++-----
 6 files changed, 29 insertions(+), 6 deletions(-)
 create mode 100644 .gitmodules
 create mode 100644 external/CMakeLists.txt
 create mode 160000 external/linenoise

diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..d0c7fc0
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "external/linenoise"]
+	path = external/linenoise
+	url = https://github.com/antirez/linenoise
diff --git a/CMakeLists.txt b/CMakeLists.txt
index be4bea8..4000d4c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,6 +1,6 @@
 cmake_minimum_required(VERSION 3.2)
 project("extfs"
-  LANGUAGES CXX
+  LANGUAGES C CXX
   VERSION 1.0
   )
 
@@ -18,7 +18,10 @@ include("ConanPackages")
 option(EXTFS_BUILD_STATIC "Build extfs as a static library" ON)
 option(EXTFS_ENABLE_TESTS "Enable CUTE unit tests" ON)
 
+add_subdirectory("external")
+
 include_directories("include")
+include_directories(SYSTEM "external/linenoise")
 add_subdirectory("src")
 
 if(${EXTFS_ENABLE_TESTS})
diff --git a/external/CMakeLists.txt b/external/CMakeLists.txt
new file mode 100644
index 0000000..522aee8
--- /dev/null
+++ b/external/CMakeLists.txt
@@ -0,0 +1,3 @@
+add_library(linenoise OBJECT
+  "linenoise/linenoise.c"
+  )
diff --git a/external/linenoise b/external/linenoise
new file mode 160000
index 0000000..2105ce4
--- /dev/null
+++ b/external/linenoise
@@ -0,0 +1 @@
+Subproject commit 2105ce445821381cf1bca87b6d386d4ea88ee20d
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index e09c4a2..467cf46 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -2,6 +2,7 @@ add_subdirectory(fs)
 
 add_executable(extsh
   extsh.cpp
+  $<TARGET_OBJECTS:linenoise>
   )
 target_link_libraries(extsh
   extfs
diff --git a/src/extsh.cpp b/src/extsh.cpp
index 9dfeea8..1c223d9 100644
--- a/src/extsh.cpp
+++ b/src/extsh.cpp
@@ -1,5 +1,7 @@
 #include "fs/extfs.hpp"
 
+#include <linenoise.h>
+
 #include <cstdint>
 #include <iostream>
 #include <stdexcept>
@@ -15,7 +17,7 @@ enum struct result : std::uint8_t
 
 result process(std::string const & command)
   {
-  if(command == "exit")
+  if(command == "exit" || command.empty())
     {
     return result::exit;
     }
@@ -25,10 +27,19 @@ result process(std::string const & command)
 
 std::string prompt(fs::extfs const & disk)
   {
-  std::cout << '[' << (disk.has_label() ? disk.label() : "No Label") << "] >>> ";
-  std::string command{};
-  std::cin >> command;
-  return command;
+  using namespace std::string_literals;
+
+  auto const promptText = "["s + (disk.has_label() ? disk.label() : "No Label") + "] > ";
+  auto const input = linenoise(promptText.c_str());
+  if(input)
+    {
+    linenoiseHistoryAdd(input);
+    auto const inputString = std::string{input};
+    linenoiseFree(input);
+    return inputString;
+    }
+
+  return {};
   }
 
 void repl(fs::extfs & disk)
@@ -59,6 +70,7 @@ int main(int argc, char const * argv[])
 
   if(disk.open())
     {
+    linenoiseHistorySetMaxLen(1024);
     repl(disk);
     }
   else
-- 
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