Improve install on mingw

Makefile

@@ -30,6 +30,7 @@ BUSTED=busted
 LUACOV=luacov
 LUAMON=luamon -w nelua,spec,tools,examples,lib,tests -e lua,nelua -q -x
 JEKYLL=bundle exec jekyll
+PREFIX=/usr/local
 
 ## Variables for Docker
 UID=$(shell id -u $(USER))
@@ -49,10 +50,8 @@ endif
 ## Detect the lua interpreter to use.
 ifeq ($(SYS), Windows)
 	LUA=$(realpath $(NELUALUA).exe)
-	PREFIX=/usr
 else
 	LUA=$(NELUALUA)
-	PREFIX=/usr/local
 endif
 
 ## The default target.

nelua.sh

@@ -41,5 +41,13 @@ if [ ! -f "$NELUA_LUALIB/nelua.lua" ]; then
   exit 1
 fi
 
+# determine nelua's lua package path
+if [[ "$OSTYPE" = "msys" ]]; then
+  NELUA_PACKAGE_PATH="$(cygpath -w $NELUA_LUALIB/)"
+else
+  NELUA_PACKAGE_PATH="$NELUA_LUALIB/"
+fi
+NELUA_PACKAGE_PATH="$(printf "%q\n" "$NELUA_PACKAGE_PATH")"
+
 # execute nelua compiler
-exec $NELUA_LUA -e "package.path='$NELUA_LUALIB/?.lua;'..package.path" $NELUA_LUALIB/nelua.lua "$@"
+exec $NELUA_LUA -e "package.path='${NELUA_PACKAGE_PATH}?.lua;'..package.path" $NELUA_LUALIB/nelua.lua "$@"

nelua/runner.lua

@@ -41,9 +41,7 @@ local function run(argv, redirect)
     input = fs.ereadfile(infile)
   end
 
-  if config.before_parse then
-    config.before_parse()
-  end
+  if config.before_parse then config.before_parse() end
 
   -- parse ast
   local parser = syntax.parser

src/Makefile

@@ -26,13 +26,6 @@ ifneq (,$(findstring MSYS,$(SYS)))
 	SYS=Windows
 endif
 
-## Prefix
-ifeq ($(SYS), Windows)
-	PREFIX=/usr
-else
-	PREFIX=/usr/local
-endif
-
 ## Install path
 DEFS+=-DLUA_ROOT='"$(PREFIX)/"'