update debug log usage and add fanciness to log printing

ast/func_table.go

@@ -17,7 +17,10 @@
 
 package ast
 
-import "gitlab.com/whom/shs/log"
+import (
+    "fmt"
+    "gitlab.com/whom/shs/log"
+)
 
 /* expected function header for any stdlib function
  */
@@ -61,8 +64,12 @@ func (f Function) ParseFunction(args *Token) bool {
 
     if i != 0 {
         log.Log(log.ERR,
-                "Incorrect number of arguments",
-                "eval")
+            "Incorrect number of arguments",
+            "eval")
+        log.Log(log.DEBUG,
+            fmt.Sprintf("Function %s expects %d arguments. You've provided %d arguments.",
+                f.Name, f.Args, f.Args - i),
+            "eval")
         return false
     }
 
@@ -89,7 +96,7 @@ func (f Function) CallFunction(args *Token, vt VarTable, ft FuncTable) *Token {
 func GetFunction(arg string, table FuncTable) *Function {
     target, ok := (*table)[arg]
     if !ok {
-        log.Log(log.DEBUG,
+        log.Log(log.INFO,
                 "function " + arg + " not found",
                 "ftable")
         return nil