Rename die to dief

[korya]

Problem

die takes a format string and variadic arguments but carried no f, so nothing at the call site distinguished it from a function taking a literal message.

die(71, "Invalid value for --log-level flag: %q", levelStr)

The standard library settles this with a suffix — Printf, Fatalf, Errorf. Without it, a reader has to open the definition to know whether the first string is a format, which matters because passing untrusted text containing a % to a format-taking function silently produces %!d(MISSING) in the output.

Solution

Rename to dief.

Before / after:

func die(rc int, format string, args ...interface{})    // is the string a format?
func dief(rc int, format string, args ...interface{})   // yes

Seven call sites renamed alongside the definition, plus a one-line doc comment on what the function does. No behaviour change — format strings, exit codes and output are untouched.

Verified by exercising every exit code the function produces:

Invocation	Exit
unreachable host	93
--log-level trace	71
--maphost garbage	71
--assert-body '[bad'	71
-X 'BAD METHOD'	91
--nope	103

Coverage stays at 100.0%. No visual change — headless CLI.

🤖 Generated with Claude Code