repl: enabled back and added automated tests

fixed typos and macos errors

Makefile

@@ -25,6 +25,7 @@ test: v
 	find . -name '*_test.v' -print0 | xargs -0 -n1 ./v
 	echo "Building V examples..."
 	find examples -name '*.v' -print0 | xargs -0 -n1 ./v
+	bash ./compiler/tests/repl/repl.sh
 
 clean:
 	-rm -f v.c v*.c v.c.out v vprod thirdparty/**/*.o

compiler/main.v

@@ -1292,8 +1292,6 @@ fn new_v(args[]string) *V {
 }
 
 fn run_repl() []string {
-	println('REPL is temporarily disabled, sorry') 
-	exit(1) 
 	println('V $Version')
 	println('Use Ctrl-C or `exit` to exit')
 	file := '.vrepl.v'

compiler/tests/repl/README.md

@@ -0,0 +1,14 @@
+# V REPL Tests Script
+
+### How to write a new test
+  - Create a new file named `*.repl`
+  - Write the input to be given to REPL
+  - Add `===output===`
+  - Write the output expected
+
+### Example :
+```
+a := 1
+println(a)
+===output===
+1

compiler/tests/repl/arr_decl.repl

@@ -0,0 +1,4 @@
+arr := ['1', '2', '3', '4']
+println(arr)
+===output===
+["1", "2", "3", "4"]

compiler/tests/repl/error.repl

@@ -0,0 +1,3 @@
+println(a)
+===output===
+V panic: .vrepl.v:2 undefined: `a`

compiler/tests/repl/interpolation.repl

@@ -0,0 +1,5 @@
+a := 'Hello'
+b := 'World'
+println('$a $b')
+===output===
+Hello World

compiler/tests/repl/multiple_decl.repl

@@ -0,0 +1,10 @@
+name := 'Bob' 
+age := 20
+large_number := i64(9999999999)
+println(name)
+println(age)
+println(large_number)
+===output===
+Bob
+20
+9999999999

compiler/tests/repl/multiple_println.repl

@@ -0,0 +1,7 @@
+println('Hello World')
+println('Foo Bar')
+println('dlroW olleH')
+===output===
+Hello World
+Foo Bar
+dlroW olleH

compiler/tests/repl/newlines.repl

@@ -0,0 +1,5 @@
+
+
+
+
+===output===

compiler/tests/repl/nothing.repl

@@ -0,0 +1 @@
+===output===

compiler/tests/repl/println.repl

@@ -0,0 +1,3 @@
+println('hello world')
+===output===
+hello world

compiler/tests/repl/repl.sh

@@ -0,0 +1,64 @@
+#!/bin/sh
+
+score=0
+total=0
+debug=0
+
+if [ "$1" = "-h" ]; then
+  echo "V REPL Tests Script"
+  echo
+  echo "-d for debug extra outputs"
+  echo
+  echo "Reads test files '*.repl_test' and execute them"
+  echo "See README.md for details on how to write tests"
+  exit 0
+fi
+
+if [ "$1" = "-d" ]; then
+    debug=1
+fi
+
+test_command() {
+  if [ $debug -eq 1 ]; then
+    echo -en "Testing $1: "
+  fi
+
+  file=`cat $1`
+  output_start=`echo -e "$file" | grep -n '===output===' | cut -f1 -d:`
+
+  if [ $output_start -gt 1 ]; then
+    input=`echo -en "$file" | head -n $((output_start - 1))`
+  else
+    input=""
+  fi
+
+  output=`echo -en "$file" | tail -n +$((output_start + 1))`
+  result=`echo -en "$input" | ./v | tail -n +3 | sed 's/>>> //g'`
+
+  if [ "$output" = "$result" ]; then
+    score=$(($score + 1))
+    if [ $debug -eq 1 ]; then
+      echo -e "\033[32mOK\033[0m"
+    fi
+  else
+    if [ $debug -eq 0 ]; then
+      echo -en "REPL: "
+    fi
+    echo -e "\033[31mKO\033[0m"
+    echo -e "\033[1mGot :\033[0m\n$result"
+    echo -e "\033[1mExpected :\033[0m\n$output"
+  fi
+
+  total=$(($total + 1))
+  rm -f .vrepl .vrepl_temp
+}
+
+for file in `ls compiler/tests/repl/*.repl`; do
+  test_command $file
+done
+
+echo -e "\033[1mREPL SCORE:" $score "/" $total "\033[0m"
+
+if [ $score != $total ]; then
+  exit 1
+fi

compiler/tests/repl/var_decl.repl

@@ -0,0 +1,4 @@
+a := 1
+println(a)
+===output===
+1