Sketching out the parser.

recipe.go

@@ -0,0 +1,57 @@
+
+package main
+
+
+import (
+    "os/exec"
+    "os"
+    "io"
+)
+
+
+// A monolithic function for executing recipes.
+func executeRecipe(program string,
+                   args []string,
+                   input string,
+                   echo_out bool,
+                   echo_err bool,
+                   capture_out bool) string {
+    cmd := exec.Command(program, args...)
+
+    if echo_out {
+        cmdout, err := cmd.StdoutPipe()
+        if err != nil {
+            go io.Copy(os.Stdout, cmdout)
+        }
+    }
+
+    if echo_err {
+        cmderr, err := cmd.StdoutPipe()
+        if err != nil {
+            go io.Copy(os.Stderr, cmderr)
+        }
+    }
+
+    if len(input) > 0 {
+        cmdin, err := cmd.StdinPipe()
+        go func () { cmdin.Write([]byte(input)) }()
+    }
+
+
+    output := ""
+    var err error
+    if capture_out {
+        output, err = cmd.Output()
+    } else {
+        err = cmd.Run()
+    }
+
+    if err != nil {
+        // TODO: better error output
+        log.Fatal("Recipe failed")
+    }
+
+    return output
+}
+
+