retrofitted string functions

stdlib/stdlib.go

@@ -129,6 +129,20 @@ func GenFuncTable() ast.FuncTable {
             TimesCalled:     0,
             Args:            1,
         },
+
+        "concat": &ast.Function{
+            Function:   concat,
+            Name:"concatenate",
+            TimesCalled:     0,
+            Args:           -1,
+        },
+
+        "print": &ast.Function{
+            Function:print_str,
+            Name:      "print",
+            TimesCalled:     0,
+            Args:            1,
+        },
     }
 
     return stdlib

stdlib/string.go

@@ -0,0 +1,48 @@
+/*   SHS: Syntactically Homogeneous Shell
+ *   Copyright (C) 2019  Aidan Hahn
+ *
+ *   This program is free software: you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation, either version 3 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package stdlib
+
+import (
+    "fmt"
+    "gitlab.com/whom/shs/ast"
+    "gitlab.com/whom/shs/log"
+)
+
+func concat(in *ast.Token, vt ast.VarTable, ft ast.FuncTable) *ast.Token {
+    in = in.Eval(ft, vt)
+
+    var res string
+    for i := in; i != nil; i = i.Next {
+        if i.Tag == ast.LIST {
+            log.Log(log.ERR, "Not concatenating list", "conc")
+            log.Log(log.DEBUG, "Try using the expand operator (...)", "conc")
+            continue
+        }
+
+        res += i.Value()
+    }
+
+    t := &ast.Token{Tag: ast.STRING}
+    t.Set(res)
+    return t
+}
+
+func print_str(in *ast.Token, vt ast.VarTable, ft ast.FuncTable) *ast.Token {
+    fmt.Println(in.Eval(ft, vt))
+    return nil
+}