Initial import.

die/README.md

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+Simple fatal utilities for Go programs.
+
+```
+	result, err := doSomething()
+	die.If(err)
+
+	ok := processResult(result)
+	if !ok {
+		die.With("failed to process result %s", result.Name)
+	}
+```
+

die/die.go

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+// Package die contains utilities for fatal error handling.
+package die
+
+import (
+	"fmt"
+	"os"
+)
+
+// If prints the error to stderr and exits if err != nil.
+func If(err error) {
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "[!] %v\n", err)
+		os.Exit(1)
+	}
+}
+
+// With prints the message to stderr, appending a newline, and exits.
+func With(fstr string, args ...interface{}) {
+	out := fmt.Sprintf("[!] %s\n", fstr)
+	fmt.Fprintf(os.Stderr, out, args...)
+	os.Exit(1)
+}