1 files changed, 22 insertions, 0 deletions
diff --git a/Tools/LuaMacro/tests/dollar.lua b/Tools/LuaMacro/tests/dollar.lua
new file mode 100644
index 0000000..954416d
--- /dev/null
+++ b/Tools/LuaMacro/tests/dollar.lua
@@ -0,0 +1,22 @@
+local macro = require 'macro'
+
+macro.define('$',function(get)
+   local t,v = get()
+   if t == 'iden' then
+      return 'os.getenv("'..v..'")'
+   elseif t == '(' then
+      local rest = get:upto ')'
+      return 'eval("'..tostring(rest)..'")'
+   end
+end)
+
+return function()
+    return [[
+local function eval(cmd)
+    local f = io.popen(cmd,'r')
+    local res = f:read '*a'
+    f:close()
+    return res
+end
+]]
+end