retrofitted filesys functions

stdlib/filesys.go

@@ -0,0 +1,38 @@
+/*   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 (
+    "os"
+    "gitlab.com/whom/shs/ast"
+    "gitlab.com/whom/shs/log"
+)
+
+func cd(in *ast.Token, vt ast.VarTable, ft ast.FuncTable) *ast.Token {
+    in = in.Eval(ft, vt)
+    if in.Tag == ast.LIST {
+        log.Log(log.ERR, "Couldnt change dir to a list", "cd")
+        return nil
+    }
+
+    err := os.Chdir(in.Value())
+    if err != nil {
+        log.Log(log.ERR, err.Error(), "cd")
+    }
+    return nil
+}

stdlib/stdlib.go

@@ -123,6 +123,12 @@ func GenFuncTable() ast.FuncTable {
             Args:           -1,
         },
 
+        "cd": &ast.Function{
+            Function:       cd,
+            Name:  "changedir",
+            TimesCalled:     0,
+            Args:            1,
+        },
     }
 
     return stdlib