restore back before introducing main.cpp

ml.cpp

@@ -9,6 +9,7 @@
 #include "clib/json11.h"
 #include "clib/printf.h"
 
+#include "linenoise.h"
 
 #include <cmath>
 #include <map>
@@ -1609,14 +1610,54 @@ namespace builtin {
     }
 }
 
+// void completion(const char *buf, linenoiseCompletions *lc) {
+//     if (buf[0] == 'h') {
+//         linenoiseAddCompletion(lc,"hello");
+//         linenoiseAddCompletion(lc,"hello there");
+//     }
+// }
+
+// char *hints(const char *buf, int *color, int *bold) {
+//     if (!strcasecmp(buf,"hello")) {
+//         *color = 35;
+//         *bold = 0;
+//         return " World";
+//     }
+//     return NULL;
+// }
+
 void repl(MlEnvironment &env) {
 	std::string code;
 	std::string input;
 	MlValue tmp;
 	std::vector<MlValue> parsed;
+	char *line;
+
+	// TODO not portable and in function
+    std::string history_file;
+	std::string file{"/.ml_history.txt"};
+	const char *t = std::getenv("HOME");
+	if (t == nullptr) 
+    	history_file = "/tmp/" + file;
+	else
+    	history_file = std::string{t} + "/" + file;
+
+	// linenoiseHistorySetMaxLen(500);
+	// linenoiseSetCompletionCallback(completion);
+	// linenoiseSetHintsCallback(hints);
+
+	linenoiseSetMultiLine(1);
+	linenoiseHistoryLoad(history_file.c_str()); 
+
 	while (true) {
-		std::cout << ">>> ";
-		std::getline(std::cin, input);
+//		std::cout << ">>> ";
+//		std::getline(std::cin, input);
+
+		line = linenoise(">>> ");
+		linenoiseHistoryAdd(line);
+
+		input = std::string(line);
+
 		if (input == "!quit" || input == "!q")
 			break;
 		else if (input == "!env" || input == "!e")
@@ -1638,6 +1679,8 @@ void repl(MlEnvironment &env) {
 			}
 		}
 	}
+
+	linenoiseHistorySave(history_file.c_str()); 
 }
 
 void load_std_lib(MlEnvironment &env) {
@@ -1773,16 +1816,6 @@ MlValue MlEnvironment::get(const std::string &name) const {
 	throw MlError(MlValue::atom(name), *this, ATOM_NOT_DEFINED);
 }
 
-std::vector<std::string> getCmdOption(char *argv[], int argc, const std::string &option) {
-	std::vector<std::string> tokens;
-	for (int i = 1; i < argc; ++i) {
-		if (option == argv[i] && i + 1 < argc) {
-			i++;
-			tokens.push_back(std::string(argv[i]));
-		}
-	}
-	return tokens;
-}
 
 bool cmdOptionExists(char **begin, char **end, const std::string &option) { return std::find(begin, end, option) != end; }
 
@@ -1811,7 +1844,7 @@ int main(int argc, char *argv[]) {
 		return 0;
 	}
 
-		if (argc == 1 || (argc == 2 && std::string(argv[1]) == "-i"))
+	if (argc == 1 || (argc == 2 && std::string(argv[1]) == "-i"))
 			repl(env);
 		else if (argc == 3 && std::string(argv[1]) == "-c")
 			run(argv[2], env);